[461541a] | 1 | /* abac_xml.c, specifically for GENI */ |
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| 2 | |
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[9e063cb] | 3 | /* in xml, rc in general is, 1 is good, 0 or -1 is bad */ |
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| 4 | |
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[461541a] | 5 | #define _GNU_SOURCE |
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| 6 | #include <stdio.h> |
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| 7 | #include <stdlib.h> |
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| 8 | #include <string.h> |
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| 9 | #include <time.h> |
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| 10 | |
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| 11 | #include <libxml/tree.h> |
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| 12 | #include <libxml/xmlmemory.h> |
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| 13 | #include <libxml/parser.h> |
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| 14 | |
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| 15 | #ifndef XMLSEC_NO_XSLT |
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| 16 | #include <libxslt/xslt.h> |
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| 17 | #include <libxslt/security.h> |
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| 18 | #endif /* XMLSEC_NO_XSLT */ |
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| 19 | |
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| 20 | #include <xmlsec/xmlsec.h> |
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| 21 | #include <xmlsec/xmltree.h> |
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| 22 | #include <xmlsec/xmldsig.h> |
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| 23 | #include <xmlsec/base64.h> |
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| 24 | #include <xmlsec/templates.h> |
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| 25 | #include <xmlsec/crypto.h> |
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| 26 | #include <xmlsec/list.h> |
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| 27 | |
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| 28 | #include <openssl/sha.h> |
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| 29 | |
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[e50f807] | 30 | #include "abac.h" |
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| 31 | #include "abac_util.h" |
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| 32 | |
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[b7e77df] | 33 | extern int abac_verifier_load_id_chars(void *, char*, abac_keyid_map_t *); |
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[02036f4] | 34 | extern void* abac_get_sha_from_nake_pem(char *npem, char **sha1); |
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[92661b4] | 35 | extern void abac_split(char *string, char *delim, char **ret, int *num); |
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[02036f4] | 36 | static int debug=0; |
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| 37 | |
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[461541a] | 38 | /* from Ted's reader */ |
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| 39 | |
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| 40 | /* for accessing GENI privilege credentials */ |
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| 41 | #define GENI_signed_credential "signed-credential" |
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| 42 | #define GENI_credential "credential" |
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| 43 | #define GENI_type "type" |
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| 44 | #define GENI_serial "serial" |
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| 45 | #define GENI_owner_gid "owner_gid" |
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| 46 | #define GENI_owner_urn "owner_urn" |
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| 47 | #define GENI_target_gid "target_gid" |
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| 48 | #define GENI_target_urn "target_urn" |
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| 49 | #define GENI_uuid "uuid" |
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| 50 | #define GENI_expires "expires" |
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| 51 | #define GENI_privileges "privileges" |
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| 52 | #define GENI_privilege "privilege" |
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| 53 | #define GENI_name "name" |
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| 54 | #define GENI_can_delegate "can_delegate" |
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[ec550f7] | 55 | #define GENI_x509_certificate "X509Certificate" |
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[461541a] | 56 | |
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| 57 | /* for accessing GENI abac credentials. signed-credential, credential, type and |
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| 58 | * expires are present as well. */ |
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[94605f2] | 59 | #define GENI_abac "abac" |
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[461541a] | 60 | #define GENI_rt0 "rt0" |
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| 61 | #define GENI_version "version" |
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| 62 | |
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| 63 | /* maximum credential stringlen */ |
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| 64 | #define CREDLEN 1024 |
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| 65 | /* Maximum version len */ |
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| 66 | #define VERSIONLEN 256 |
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| 67 | |
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[a2b9fd2] | 68 | /* These templates are given in defines so that they can initialize the |
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| 69 | * specialization structures. */ |
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| 70 | |
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| 71 | /* XML template for a new RT0 v1.0 credential. Fill in the RT0 to store (XML |
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[e50f807] | 72 | * escaped) and the expiration time (formated using strftime_format and |
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| 73 | * strftime). */ |
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| 74 | #define template_v10 "<signed-credential>\n"\ |
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| 75 | " <credential xml:id=\"ref0\">\n"\ |
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| 76 | " <type>abac</type>\n"\ |
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| 77 | " <version>1.0</version>\n"\ |
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| 78 | " <expires>%s</expires>\n"\ |
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| 79 | " <rt0>%s</rt0>\n"\ |
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| 80 | " </credential>\n"\ |
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| 81 | " <signatures>\n"\ |
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| 82 | " <Signature xmlns=\"http://www.w3.org/2000/09/xmldsig#\">\n"\ |
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| 83 | " <SignedInfo>\n"\ |
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| 84 | " <CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"/>\n"\ |
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| 85 | " <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\"/>\n"\ |
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| 86 | " <Reference URI=\"#ref0\">\n"\ |
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| 87 | " <Transforms>\n"\ |
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| 88 | " <Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"/>\n"\ |
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| 89 | " </Transforms>\n"\ |
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| 90 | " <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\"/>\n"\ |
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| 91 | " <DigestValue/>\n"\ |
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| 92 | " </Reference>\n"\ |
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| 93 | " </SignedInfo>\n"\ |
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| 94 | " <SignatureValue/>\n"\ |
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| 95 | " <KeyInfo>\n"\ |
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| 96 | " <KeyValue/>\n"\ |
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| 97 | " <X509Data>\n"\ |
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| 98 | " <X509Certificate/>\n"\ |
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| 99 | " <X509SubjectName/>\n"\ |
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| 100 | " <X509IssuerSerial/>\n"\ |
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| 101 | " </X509Data>\n"\ |
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| 102 | " </KeyInfo>\n"\ |
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| 103 | " </Signature>\n"\ |
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| 104 | " </signatures>\n"\ |
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| 105 | "</signed-credential>" |
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| 106 | |
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[a2b9fd2] | 107 | /* XML template for a new RT0 v1.1 credential. Fill in the RT0 to store (XML |
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[e50f807] | 108 | * escaped) and the expiration time (formated using strftime_format and |
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| 109 | * strftime). */ |
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| 110 | #define template_v11 "<signed-credential>\n"\ |
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| 111 | " <credential xml:id=\"ref0\">\n"\ |
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| 112 | " <type>abac</type>\n"\ |
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| 113 | " <serial/>\n"\ |
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| 114 | " <owner_gid/>\n"\ |
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| 115 | " <target_gid/>\n"\ |
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| 116 | " <uuid/>\n"\ |
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| 117 | " <expires>%s</expires>\n"\ |
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[94605f2] | 118 | " <abac>\n"\ |
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| 119 | " <rt0>\n"\ |
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| 120 | " <version>1.1</version>\n"\ |
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| 121 | " %s\n"\ |
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| 122 | " </rt0>\n"\ |
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| 123 | " </abac>\n"\ |
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[e50f807] | 124 | " </credential>\n"\ |
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| 125 | " <signatures>\n"\ |
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| 126 | " <Signature xmlns=\"http://www.w3.org/2000/09/xmldsig#\">\n"\ |
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| 127 | " <SignedInfo>\n"\ |
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| 128 | " <CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"/>\n"\ |
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| 129 | " <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\"/>\n"\ |
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| 130 | " <Reference URI=\"#ref0\">\n"\ |
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| 131 | " <Transforms>\n"\ |
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| 132 | " <Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"/>\n"\ |
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| 133 | " </Transforms>\n"\ |
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| 134 | " <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\"/>\n"\ |
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| 135 | " <DigestValue/>\n"\ |
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| 136 | " </Reference>\n"\ |
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| 137 | " </SignedInfo>\n"\ |
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| 138 | " <SignatureValue/>\n"\ |
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| 139 | " <KeyInfo>\n"\ |
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| 140 | " <KeyValue/>\n"\ |
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| 141 | " <X509Data>\n"\ |
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| 142 | " <X509Certificate/>\n"\ |
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| 143 | " <X509SubjectName/>\n"\ |
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| 144 | " <X509IssuerSerial/>\n"\ |
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| 145 | " </X509Data>\n"\ |
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| 146 | " </KeyInfo>\n"\ |
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| 147 | " </Signature>\n"\ |
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| 148 | " </signatures>\n"\ |
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| 149 | "</signed-credential>" |
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| 150 | |
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[a2b9fd2] | 151 | /* Forward declarations of functions to parse and generate rt0 elements in |
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| 152 | * various formats */ |
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[e50f807] | 153 | xmlChar *encode_rt0_xml_v10(abac_attribute_t *); |
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| 154 | xmlChar *encode_rt0_xml_v11(abac_attribute_t *); |
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[d2b198c] | 155 | xmlChar **parse_rt0_xml_v10(xmlNodePtr, abac_keyid_map_t *); |
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| 156 | xmlChar **parse_rt0_xml_v11(xmlNodePtr, abac_keyid_map_t *); |
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[e50f807] | 157 | |
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[a2b9fd2] | 158 | /* Structure that specializes XML parsing */ |
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[e50f807] | 159 | typedef struct { |
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[a2b9fd2] | 160 | /* Version to use these functions for */ |
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| 161 | char *version; |
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| 162 | /* Convert an ABAC attribute into an rt0 element */ |
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[e50f807] | 163 | xmlChar *(*rt0_to_xml)(abac_attribute_t *); |
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[a2b9fd2] | 164 | /* Convert an rt0 element into a list of RT0 strings */ |
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[d2b198c] | 165 | xmlChar **(*xml_to_rt0)(xmlNodePtr, abac_keyid_map_t *); |
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[a2b9fd2] | 166 | /* The overall template to generate this version of credential */ |
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[e50f807] | 167 | char *out_template; |
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| 168 | } GENI_xml_processing_t; |
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| 169 | |
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[a2b9fd2] | 170 | /* The processing specializations */ |
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[e50f807] | 171 | GENI_xml_processing_t xml_proc[] = { |
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[bc12f3d] | 172 | { "GENIv1.0", encode_rt0_xml_v10, parse_rt0_xml_v10, template_v10}, |
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[e50f807] | 173 | { "1.0", encode_rt0_xml_v10, parse_rt0_xml_v10, template_v10}, |
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[bc12f3d] | 174 | { "GENIv1.1", encode_rt0_xml_v11, parse_rt0_xml_v11, template_v11}, |
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[e50f807] | 175 | { "1.1", encode_rt0_xml_v11, parse_rt0_xml_v11, template_v11}, |
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| 176 | { NULL, NULL, NULL}, |
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| 177 | }; |
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| 178 | |
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[a2b9fd2] | 179 | /* Query funtion to convert a processing version into the functions above */ |
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[e50f807] | 180 | GENI_xml_processing_t *get_xml_processing(char *ver) { |
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| 181 | int i ; |
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| 182 | |
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| 183 | for (i = 0; xml_proc[i].version; i++) { |
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| 184 | if (!strcmp(xml_proc[i].version, ver)) |
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| 185 | return &xml_proc[i]; |
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| 186 | } |
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| 187 | return NULL; |
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[461541a] | 188 | } |
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| 189 | |
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[e50f807] | 190 | |
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[461541a] | 191 | /* Hex dump the contents of buf (length len) to stderr. For debugging */ |
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[9e063cb] | 192 | static void dump_it(xmlChar *buf, int len) { |
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[461541a] | 193 | int i; |
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| 194 | |
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| 195 | for (i=0; i < len; i++ ) |
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| 196 | fprintf(stderr, "%02x ", buf[i] & 0xff); |
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| 197 | fprintf(stderr, "\n"); |
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| 198 | } |
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| 199 | |
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| 200 | /* Convert a SHA1 hash to text for printing or use in strings. keyid is the |
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| 201 | * hash (SHA_DIGEST_LENGTH bytes long) and text is the output string (at least |
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| 202 | * 2 * SHA_DIGEST_LENGTH +1 bytes long). The caller is responsible for |
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| 203 | * allocating and deallocating each of them. */ |
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[9e063cb] | 204 | static void sha1_to_text(xmlChar *keyid, xmlChar *text) { |
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[461541a] | 205 | int i = 0; |
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| 206 | |
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| 207 | for (i=0; i < SHA_DIGEST_LENGTH; i++) |
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| 208 | snprintf((char *) text+2*i, 3, "%02x", keyid[i] & 0xff); |
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| 209 | } |
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| 210 | |
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| 211 | /* |
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| 212 | * Returns the content pointer of the XML_TEXT node that is the child of the |
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| 213 | * node passed in. Node must point to an XML_ELEMENT node. the return value |
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| 214 | * is still part of node's XML document, so treat it as read only. */ |
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[9e063cb] | 215 | static xmlChar *get_element_content(xmlNodePtr node) { |
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[461541a] | 216 | xmlNodePtr text = NULL; |
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| 217 | |
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| 218 | if ( node->type != XML_ELEMENT_NODE ) return NULL; |
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| 219 | if ( !( text = node->children) ) return NULL; |
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| 220 | if ( text->type != XML_TEXT_NODE ) return NULL; |
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| 221 | return text->content; |
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| 222 | } |
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| 223 | |
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| 224 | /*Find the XML element named field that is a at or below node in the XML |
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| 225 | * document and return a copy of the base64 decoded content of its content. |
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[ec550f7] | 226 | * For example, find key day in a signature and return it base64decoded. buf |
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[461541a] | 227 | * is allocated and its length is returned in len. Any values for buf and len |
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| 228 | * are ignored and overwritten. */ |
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[9e063cb] | 229 | static int get_base64_field(xmlNodePtr node, xmlChar *field, |
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[461541a] | 230 | xmlChar **buf, int *len) { |
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| 231 | xmlChar *txt = NULL; |
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| 232 | |
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| 233 | *buf = NULL; |
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| 234 | |
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| 235 | if ( !(node = xmlSecFindNode(node, field, xmlSecDSigNs))) |
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| 236 | goto fail; |
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| 237 | |
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| 238 | if ( !(txt = get_element_content(node))) |
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| 239 | goto fail; |
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| 240 | |
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| 241 | *len = strlen((char *) txt); |
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| 242 | if ( !(*buf = malloc(*len))) |
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| 243 | goto fail; |
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| 244 | |
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| 245 | if ( (*len = xmlSecBase64Decode(txt, *buf, *len)) < 0 ) |
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| 246 | goto fail; |
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| 247 | |
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| 248 | return 1; |
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| 249 | fail: |
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| 250 | if ( *buf) free(*buf); |
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| 251 | *len = 0; |
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| 252 | return 0; |
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| 253 | } |
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| 254 | /* Construct an ASN.1 header for a field of type h that is len bytes long. |
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| 255 | * Mosttly this creates the proper length encoding under ASN.1's length |
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| 256 | * encoding rules. buf will contain the new header (and the caller is |
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| 257 | * responsible for making sure it is at least 6 bytes long, though fewer are |
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| 258 | * usually used. The length of the constructed header is returned. This is |
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| 259 | * used in creating a key hash from key data.*/ |
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[9e063cb] | 260 | static int make_asn1_header(char h, size_t len, xmlChar *buf) { |
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[461541a] | 261 | if ( len > 0x00ffffff) { |
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| 262 | buf[0] = h; |
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| 263 | buf[1] = 0x84; |
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| 264 | buf[2] = (len >> 24) & 0xff; |
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| 265 | buf[3] = (len >> 16) & 0xff; |
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| 266 | buf[4] = (len >> 8) & 0xff; |
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| 267 | buf[5] = (len) & 0xff; |
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| 268 | return 6; |
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| 269 | } else if ( len > 0x0000ffff ) { |
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| 270 | buf[0] = h; |
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| 271 | buf[1] = 0x83; |
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| 272 | buf[2] = (len >> 16) & 0xff; |
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| 273 | buf[3] = (len >> 8) & 0xff; |
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| 274 | buf[4] = (len) & 0xff; |
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| 275 | return 5; |
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| 276 | } else if ( len > 0x000000ff ) { |
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| 277 | buf[0] = h; |
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| 278 | buf[1] = 0x82; |
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| 279 | buf[2] = (len >> 8) & 0xff; |
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| 280 | buf[3] = (len) & 0xff; |
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| 281 | return 4; |
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| 282 | } else if ( len > 0x80 ) { |
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| 283 | buf[0] = h; |
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| 284 | buf[1] = 0x81; |
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| 285 | buf[2] = (len) & 0xff; |
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| 286 | return 3; |
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| 287 | } else { |
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| 288 | buf[0] = h; |
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| 289 | buf[1] = (len) & 0xff; |
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| 290 | return 2; |
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| 291 | } |
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| 292 | } |
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| 293 | |
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| 294 | /* Find the RSA key parameters in the KeyInfo section of the XML document |
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| 295 | * pointed to by doc, construct the ASN.1 encoding of that key and SHA1 hash |
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| 296 | * it. This gives the standard keyid of that key. keyid will be the binary |
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| 297 | * encoding of that (the bits of the hash) sha1_to_text will turn it to text. |
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| 298 | * keyid must be at least SHA_DIGEST_LENGTH bytes long, and the caller is |
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| 299 | * responsible for it. This routine returns 1 on success and 0 on failure. */ |
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[9e063cb] | 300 | static int get_keyid_from_keyinfo(xmlDocPtr doc, xmlChar *keyid) { |
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[461541a] | 301 | xmlNodePtr root = NULL; /* XML document root */ |
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| 302 | xmlNodePtr node = NULL; /* Scratch XML node */ |
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| 303 | |
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| 304 | xmlChar b0[20]; /* Header for the sequence */ |
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| 305 | xmlChar b1[20]; /* Header for the modulus */ |
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| 306 | xmlChar b2[20]; /* Header for the exponent */ |
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| 307 | int l0 = 0; /* Header length for the sequence */ |
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| 308 | int l1 = 0; /* Header length for the modulus */ |
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| 309 | int l2 = 0; /* Header length for the exponent */ |
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| 310 | |
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| 311 | xmlChar *modBuf = NULL; /* Bytes of the modulus */ |
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| 312 | xmlChar *expBuf = NULL; /* Bytes of the exponent */ |
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| 313 | int modLen = 0; /* Length of the modulus */ |
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| 314 | int expLen = 0; /* Length of the exponent */ |
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| 315 | |
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| 316 | SHA_CTX sha; /* SHA1 hash context */ |
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| 317 | |
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| 318 | int rv = 0; /* return value */ |
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| 319 | |
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| 320 | if ( !SHA1_Init(&sha)) goto fail; |
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| 321 | |
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| 322 | if ( !doc || !(root = xmlDocGetRootElement(doc)) ) |
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| 323 | goto fail; |
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| 324 | |
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| 325 | /* Find the KeyInfo section to be the root of later searches */ |
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| 326 | if ( !(node = xmlSecFindNode(root, |
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| 327 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
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| 328 | goto fail; |
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| 329 | |
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| 330 | /* Get the binary for the modulus and exponent */ |
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| 331 | if ( !get_base64_field(node, (xmlChar *) "Modulus", &modBuf, &modLen)) |
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| 332 | goto fail; |
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| 333 | if ( !get_base64_field(node, (xmlChar *) "Exponent", &expBuf, &expLen)) |
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| 334 | goto fail; |
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| 335 | |
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| 336 | /* Construct the headers for modulus and exponent. Another weird fact |
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| 337 | * about ASN.1 is that all the integers are signed, so if either the |
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| 338 | * modulus or exponent has the high order bit of its first byte set, the |
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| 339 | * ASN.1 encoding has a 0 byte prepended. This code appends the 0 byte to |
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| 340 | * the header, which results in the same hash. */ |
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| 341 | if ( modBuf[0] & 0x80 ) { |
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| 342 | l1 = make_asn1_header(0x02, modLen +1, b1); |
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| 343 | b1[l1++] = '\0'; |
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| 344 | } else { |
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| 345 | l1 = make_asn1_header(0x02, modLen, b1); |
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| 346 | } |
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| 347 | |
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| 348 | if ( expBuf[0] & 0x80 ) { |
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| 349 | l2 = make_asn1_header(0x02, expLen +1, b2); |
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| 350 | b2[l2++] = '\0'; |
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| 351 | } else { |
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| 352 | l2 = make_asn1_header(0x02, expLen, b2); |
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| 353 | } |
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| 354 | |
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| 355 | /* Sequence header: have to do it after we know the lengths of the inner |
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| 356 | * headers. */ |
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| 357 | l0 = make_asn1_header(0x30, modLen + expLen + l1 + l2, b0); |
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| 358 | /* Hash it all up in parts */ |
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| 359 | SHA1_Update(&sha, b0, l0); |
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| 360 | SHA1_Update(&sha, b1, l1); |
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| 361 | SHA1_Update(&sha, modBuf, modLen); |
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| 362 | SHA1_Update(&sha, b2, l2); |
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| 363 | SHA1_Update(&sha, expBuf, expLen); |
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| 364 | SHA1_Final(keyid, &sha); |
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| 365 | rv = 1; |
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| 366 | fail: |
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| 367 | |
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| 368 | if (modBuf) free(modBuf); |
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| 369 | if (expBuf) free(expBuf); |
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| 370 | return rv; |
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| 371 | } |
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| 372 | |
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| 373 | /* Check the signature of either kind of credential - it'll work for basically |
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| 374 | * any signed XML. Returns true if the signature checks and false otherwise. |
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| 375 | * Takes a pointer to the XML document to check. Similar to the examples at |
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| 376 | * http://www.aleksey.com/xmlsec/api/xmlsec-examples.html */ |
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[9e063cb] | 377 | static int check_signature(xmlDocPtr doc) { |
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[461541a] | 378 | xmlNodePtr root = NULL; /* Root XML node */ |
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| 379 | xmlNodePtr node = NULL; /* Scratch XML node */ |
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| 380 | xmlSecKeyInfoCtxPtr keyCtx = NULL;/* Key info context. Used to parse |
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| 381 | KeyInfo */ |
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| 382 | xmlSecKeysMngrPtr keyMan = NULL;/* Key manager - used because we have |
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| 383 | certificated. */ |
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| 384 | xmlSecKeyPtr key = NULL; /* The key extracted */ |
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| 385 | xmlSecDSigCtxPtr dsigCtx = NULL;/* Signature context */ |
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| 386 | int rv = 0; /* Return value */ |
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| 387 | |
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| 388 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
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| 389 | goto fail; |
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| 390 | |
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| 391 | /* Find the KeyInfo section to pull the keys out. */ |
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| 392 | if ( !(node = xmlSecFindNode(root, |
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| 393 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
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| 394 | goto fail; |
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| 395 | |
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| 396 | /* Create and initialize key, key manager, and context */ |
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| 397 | if ( !(key = xmlSecKeyCreate() ) ) |
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| 398 | goto fail; |
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| 399 | if ( !(keyMan = xmlSecKeysMngrCreate()) ) |
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| 400 | goto fail; |
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| 401 | |
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| 402 | if ( xmlSecCryptoAppDefaultKeysMngrInit(keyMan) < 0) |
---|
| 403 | goto fail; |
---|
| 404 | |
---|
| 405 | if ( !(keyCtx = xmlSecKeyInfoCtxCreate(keyMan)) ) |
---|
| 406 | goto fail; |
---|
| 407 | |
---|
| 408 | /* Do not check certificate signatures */ |
---|
| 409 | keyCtx->flags |= XMLSEC_KEYINFO_FLAGS_X509DATA_DONT_VERIFY_CERTS; |
---|
| 410 | |
---|
| 411 | /* Gather up the key data */ |
---|
| 412 | if ( xmlSecKeyInfoNodeRead(node, key, keyCtx) < 0 ) |
---|
| 413 | goto fail; |
---|
| 414 | |
---|
| 415 | /* Set up the signature context and attack the keys */ |
---|
| 416 | if ( !(dsigCtx = xmlSecDSigCtxCreate(NULL))) |
---|
| 417 | goto fail; |
---|
| 418 | |
---|
| 419 | dsigCtx->signKey = key; |
---|
| 420 | |
---|
| 421 | /* find the Signature section */ |
---|
| 422 | if ( !(node = xmlSecFindNode(root, |
---|
| 423 | xmlSecNodeSignature, xmlSecDSigNs))) |
---|
| 424 | goto fail; |
---|
| 425 | |
---|
| 426 | /* Check it */ |
---|
| 427 | if ( (rv = xmlSecDSigCtxVerify(dsigCtx, node)) < 0 ) |
---|
| 428 | goto fail; |
---|
| 429 | |
---|
| 430 | /* Strangely xmlSecDSigCtxVerify can return success even if the status is |
---|
| 431 | * bad. Check the status in the context explicitly and override the result |
---|
| 432 | * above if necessary.*/ |
---|
| 433 | if ( dsigCtx->status != xmlSecDSigStatusSucceeded) |
---|
| 434 | goto fail; |
---|
| 435 | |
---|
| 436 | return 1; |
---|
| 437 | fail: |
---|
| 438 | if ( key ) xmlSecKeyDestroy(key); |
---|
| 439 | if ( keyCtx ) xmlSecKeyInfoCtxDestroy(keyCtx); |
---|
| 440 | if ( dsigCtx) xmlSecDSigCtxDestroy(dsigCtx); |
---|
| 441 | return 0; |
---|
| 442 | } |
---|
| 443 | |
---|
[02036f4] | 444 | /* Extract a sha from PEM blob */ |
---|
| 445 | static void extract_owner_sha1(xmlChar *pem, xmlChar **sha1) { |
---|
[ec550f7] | 446 | abac_get_sha_from_nake_pem((char *) pem, (char **)sha1); |
---|
[02036f4] | 447 | if(debug) fprintf(stderr,"owner sha1 is (%s)..\n", *sha1); |
---|
| 448 | } |
---|
| 449 | static void extract_target_sha1(xmlChar *pem, xmlChar **sha1) { |
---|
[ec550f7] | 450 | abac_get_sha_from_nake_pem((char *) pem,(char **)sha1); |
---|
[02036f4] | 451 | if(debug) fprintf(stderr,"group sha1 is (%s)..\n", *sha1); |
---|
| 452 | } |
---|
| 453 | |
---|
[461541a] | 454 | /* Parse the content of the expires field and compare it to the time passed in |
---|
| 455 | * n. If expires is earlier, return false, else true. If n is null, compare |
---|
| 456 | * it to the current time. */ |
---|
[9e063cb] | 457 | static int check_GENI_expires(xmlChar *expires, struct tm *n) { |
---|
[461541a] | 458 | struct tm tv; /* Parsed expires field */ |
---|
| 459 | time_t now; /* Now in seconds since the epoch */ |
---|
| 460 | time_t exp; /* expires in seconds since the epoch */ |
---|
| 461 | |
---|
| 462 | if (n) now = mktime(n); |
---|
| 463 | else time(&now); |
---|
| 464 | |
---|
| 465 | strptime((char *) expires, "%FT%TZ", &tv); |
---|
| 466 | exp = timegm(&tv); |
---|
| 467 | |
---|
| 468 | return difftime(exp, now) > 0.0; |
---|
| 469 | } |
---|
| 470 | |
---|
| 471 | /* Convert a parsed privilege in a GENI privilege string into one or more ABAC |
---|
| 472 | * creds. Rules are as in http://groups.geni.net/geni/wiki/TIEDCredentials . |
---|
| 473 | * keyid is the issuer's keyid, text_owner is the owners keyid (XXX:a |
---|
| 474 | * placeholder) text_target is the target's keyid (XXX: a placeholder), priv is |
---|
| 475 | * the privilege being assigned, and delegate is true if it can be delegated. |
---|
| 476 | * carray is the output array of character strings that currently has *nc |
---|
| 477 | * entries in it. If nc has nothing in it, insert the "speaks_for" delegation |
---|
| 478 | * rules. Then add the privilege specific rules. On failure ***carray and its |
---|
| 479 | * contents are freed and *nc is set to zero.*/ |
---|
[9e063cb] | 480 | static void add_privilege_credential_string(xmlChar *text_keyid, xmlChar *text_owner, |
---|
[461541a] | 481 | xmlChar *text_target, xmlChar *priv, int delegate, xmlChar ***carray, |
---|
| 482 | int *nc) { |
---|
| 483 | xmlChar **rv = *carray; /* Local pointer to the array of strings */ |
---|
| 484 | xmlChar **newrv = NULL; /* Used to realloc the array of strings */ |
---|
| 485 | int ncred = *nc; /* Local copy of the number of creds in rv */ |
---|
| 486 | int newc = (delegate) ? 3 : 1; /* Number of new creds to add */ |
---|
| 487 | int base = ncred; /* First new credential index. This advances |
---|
| 488 | as we add creds to rv. */ |
---|
| 489 | int i = 0; /* Scratch */ |
---|
| 490 | |
---|
| 491 | /* If rv is empty, add the speaks_for rules */ |
---|
| 492 | if (base == 0 ) newc += 2; |
---|
| 493 | |
---|
| 494 | /* Resize rv */ |
---|
| 495 | if (!(newrv = realloc(rv, (base + newc) * sizeof(xmlChar *)))) |
---|
| 496 | goto fail; |
---|
[02036f4] | 497 | |
---|
| 498 | for ( i = base; i < base +newc; i ++) { |
---|
| 499 | newrv[i] = NULL; |
---|
| 500 | } |
---|
[461541a] | 501 | |
---|
| 502 | /* So fail works */ |
---|
| 503 | rv = newrv; |
---|
| 504 | ncred = base + newc; |
---|
| 505 | |
---|
| 506 | /* Add speaks_for rules if needed */ |
---|
| 507 | if ( base == 0 ) { |
---|
| 508 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
| 509 | snprintf((char *) rv[base], CREDLEN, |
---|
| 510 | "%s.speaks_for_%s <- %s.speaks_for_%s", |
---|
| 511 | text_keyid, text_owner, text_owner, text_owner); |
---|
| 512 | base++; |
---|
| 513 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
| 514 | snprintf((char *) rv[base], CREDLEN, |
---|
| 515 | "%s.speaks_for_%s <- %s", |
---|
| 516 | text_keyid, text_owner, text_owner); |
---|
| 517 | base++; |
---|
| 518 | } |
---|
| 519 | |
---|
| 520 | /* The assignemnt of priv. Always happens */ |
---|
| 521 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
| 522 | snprintf((char *) rv[base], CREDLEN, |
---|
| 523 | "%s.%s_%s <- %s.speaks_for_%s", |
---|
| 524 | text_keyid, priv, text_target, text_keyid, text_owner); |
---|
| 525 | base++; |
---|
| 526 | /* Add delegation rules */ |
---|
| 527 | if ( delegate ) { |
---|
| 528 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
| 529 | snprintf((char *) rv[base], CREDLEN, |
---|
| 530 | "%s.%s_%s <- %s.can_delegate_%s_%s.%s_%s", |
---|
| 531 | text_keyid, priv, text_target, text_keyid, priv, |
---|
| 532 | text_target, priv, text_target); |
---|
| 533 | base++; |
---|
| 534 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
| 535 | snprintf((char *) rv[base], CREDLEN, |
---|
| 536 | "%s.can_delegate_%s_%s <- %s", |
---|
| 537 | text_keyid, priv, text_target, text_owner); |
---|
| 538 | base++; |
---|
| 539 | } |
---|
| 540 | /* And return new values */ |
---|
| 541 | *carray = rv; |
---|
| 542 | *nc = ncred; |
---|
| 543 | return; |
---|
| 544 | fail: |
---|
| 545 | if ( rv ) { |
---|
| 546 | /* Delete all the allocations, ours or not, and clear the caller's |
---|
| 547 | * variables */ |
---|
| 548 | for (i = 0; i < ncred; i++) |
---|
| 549 | if (rv[i]) free(rv[i]); |
---|
| 550 | free(rv); |
---|
| 551 | } |
---|
| 552 | *carray = NULL; |
---|
| 553 | *nc = 0; |
---|
| 554 | } |
---|
| 555 | |
---|
[ec550f7] | 556 | |
---|
| 557 | /* Grab the issuer x509 blob */ |
---|
| 558 | static xmlChar *get_issuer(xmlDocPtr doc) { |
---|
| 559 | xmlNodePtr root = NULL; /* Root XML node */ |
---|
| 560 | xmlNodePtr node = NULL; /* Scratch XML node */ |
---|
| 561 | xmlNodePtr x509ptr = NULL; /* XML X509Certificate node */ |
---|
| 562 | int rv = 0; /* Return value */ |
---|
| 563 | xmlChar *pem=NULL; |
---|
| 564 | |
---|
| 565 | if (!(root = xmlDocGetRootElement(doc)) ) |
---|
| 566 | goto fail; |
---|
| 567 | |
---|
| 568 | /* Find the KeyInfo section to be the root of later searches */ |
---|
| 569 | if ( !(node = xmlSecFindNode(root, |
---|
| 570 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
---|
| 571 | goto fail; |
---|
| 572 | |
---|
| 573 | if ( !(node = xmlSecFindNode(node, |
---|
| 574 | xmlSecNodeX509Data, xmlSecDSigNs))) |
---|
| 575 | goto fail; |
---|
| 576 | |
---|
| 577 | /* Find the X509Certificate from KeyInfo section */ |
---|
| 578 | if ( x509ptr = xmlSecFindNode(node, xmlSecNodeX509Certificate, xmlSecDSigNs)) { |
---|
| 579 | pem=get_element_content(x509ptr); |
---|
| 580 | } else { |
---|
| 581 | goto fail; |
---|
| 582 | } |
---|
| 583 | return pem; |
---|
| 584 | fail: |
---|
| 585 | return NULL; |
---|
| 586 | } |
---|
| 587 | |
---|
[461541a] | 588 | /* Parse a GENI privilege credential (that has already had its signature |
---|
| 589 | * checked) and return the RT0 strings that the credential is encoded as. The |
---|
| 590 | * return value is an array of strings, zero-terminated (like argv) that holds |
---|
| 591 | * the RT0 strings. It is NULL on failure. */ |
---|
[d2b198c] | 592 | static xmlChar **parse_privilege(xmlDocPtr doc, void *ctxt_id_certs, |
---|
| 593 | abac_keyid_map_t *km) { |
---|
[461541a] | 594 | xmlNodePtr root = NULL; /* XML root node */ |
---|
| 595 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
| 596 | xmlNodePtr owner = NULL; /* XML owner_gid node */ |
---|
| 597 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
| 598 | xmlNodePtr target = NULL; /* XML target_gid node */ |
---|
| 599 | xmlNodePtr privs = NULL; /* XML privileges node */ |
---|
| 600 | xmlNodePtr priv = NULL; /* XML privilege node - used to iterate */ |
---|
| 601 | xmlChar keyid[SHA_DIGEST_LENGTH]; /* Issuer key SHA1 */ |
---|
| 602 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid as text */ |
---|
[02036f4] | 603 | xmlChar *owner_sha1 = NULL; /* owner gid as text */ |
---|
| 604 | xmlChar *target_sha1 = NULL; /* target gid as text */ |
---|
[461541a] | 605 | xmlChar **newrv = NULL; /* Used to realloc rv to add the NULL |
---|
| 606 | terminator*/ |
---|
| 607 | xmlChar **rv = NULL; /* return value */ |
---|
| 608 | int ncred = 0; /* number of creds in rv, incase we need to |
---|
| 609 | deallocate it */ |
---|
| 610 | int i = 0; /* scratch */ |
---|
| 611 | |
---|
| 612 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
---|
| 613 | goto fail; |
---|
| 614 | |
---|
| 615 | /* Get the issuer keyid */ |
---|
| 616 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
| 617 | goto fail; |
---|
| 618 | sha1_to_text(keyid, text_keyid); |
---|
| 619 | |
---|
| 620 | /* Find the various fields of interest */ |
---|
| 621 | if ( !(node = xmlSecFindNode(root, (xmlChar *) GENI_credential, NULL))) |
---|
| 622 | goto fail; |
---|
| 623 | |
---|
| 624 | /* Make sure this is not expired */ |
---|
| 625 | if ( !(expires = xmlSecFindNode(node, (xmlChar *) GENI_expires, NULL))) |
---|
| 626 | goto fail; |
---|
| 627 | |
---|
| 628 | if ( !check_GENI_expires(get_element_content(expires), NULL)) |
---|
| 629 | goto fail; |
---|
| 630 | |
---|
[ec550f7] | 631 | /* owner and target will be X.509 pem files from which we need to |
---|
| 632 | * extract keyids for add_privilege_credential_string. */ |
---|
[461541a] | 633 | if ( !(owner = xmlSecFindNode(node, (xmlChar *) GENI_owner_gid, NULL))) |
---|
| 634 | goto fail; |
---|
[02036f4] | 635 | extract_owner_sha1(get_element_content(owner),&owner_sha1); |
---|
[461541a] | 636 | |
---|
| 637 | if ( !(target = xmlSecFindNode(node, (xmlChar *) GENI_target_gid, NULL))) |
---|
| 638 | goto fail; |
---|
[02036f4] | 639 | extract_target_sha1(get_element_content(target),&target_sha1); |
---|
[461541a] | 640 | |
---|
[ec550f7] | 641 | /* extract issuer pem */ |
---|
| 642 | xmlChar *issuer_ptr=get_issuer(doc); |
---|
| 643 | |
---|
[461541a] | 644 | if ( !(privs = xmlSecFindNode(node, (xmlChar *) GENI_privileges, NULL))) |
---|
| 645 | goto fail; |
---|
| 646 | |
---|
| 647 | /* Iterate through the privileges, parsing out names and can_delegate and |
---|
| 648 | * generating the strings from it. */ |
---|
| 649 | for (priv = privs->children; priv; priv = priv->next) { |
---|
| 650 | /* reinitialized every time around */ |
---|
| 651 | xmlNodePtr n = NULL; |
---|
| 652 | xmlChar *name = NULL; |
---|
| 653 | int delegate = -1; |
---|
| 654 | |
---|
[c199a27] | 655 | /* Ignore wayward text and other gook */ |
---|
| 656 | if ( priv->type != XML_ELEMENT_NODE) |
---|
| 657 | continue; |
---|
| 658 | |
---|
| 659 | /* Ignore things that are not privilege nodes */ |
---|
| 660 | if ( strcmp((char *) priv->name, (char *) GENI_privilege) ) |
---|
| 661 | continue; |
---|
| 662 | |
---|
[461541a] | 663 | /* looking for name and can_delegate */ |
---|
| 664 | for (n = priv->children; n; n = n->next) { |
---|
| 665 | if ( n->type != XML_ELEMENT_NODE ) |
---|
| 666 | continue; |
---|
| 667 | if ( !strcmp((char *) n->name, (char *) GENI_name)) { |
---|
| 668 | name = get_element_content(n); |
---|
| 669 | continue; |
---|
| 670 | } |
---|
| 671 | if ( !strcmp((char *) n->name, (char *) GENI_can_delegate)) { |
---|
| 672 | xmlChar *boolean = get_element_content(n); |
---|
| 673 | |
---|
| 674 | if ( !strcmp((char *) boolean, "true") || |
---|
| 675 | !strcmp((char *) boolean, "1") ) { |
---|
| 676 | delegate = 1; |
---|
| 677 | } else if ( !strcmp((char *) boolean, "false") || |
---|
| 678 | !strcmp((char *) boolean, "0") ) { |
---|
| 679 | delegate = 0; |
---|
| 680 | } else { |
---|
| 681 | fprintf(stderr, "Unknown delegation value %s", boolean); |
---|
| 682 | } |
---|
| 683 | } |
---|
| 684 | } |
---|
| 685 | /* Found both name and can_delegate, add the RT0 to rv and ncred */ |
---|
| 686 | if ( name && delegate != -1 ) { |
---|
| 687 | add_privilege_credential_string(text_keyid, |
---|
[02036f4] | 688 | (xmlChar *) owner_sha1, (xmlChar *) target_sha1, name, |
---|
[461541a] | 689 | delegate, &rv, &ncred); |
---|
| 690 | if ( !rv ) goto fail; |
---|
| 691 | } |
---|
| 692 | } |
---|
| 693 | |
---|
| 694 | /* Add the terminating NULL */ |
---|
[02036f4] | 695 | if (!(newrv = realloc(rv, sizeof(xmlChar*)*(ncred+1)))) |
---|
[461541a] | 696 | goto fail; |
---|
| 697 | |
---|
[02036f4] | 698 | newrv[ncred] = NULL; |
---|
[ec550f7] | 699 | /* able to extract some RT0s, load issuer credential as side-effect */ |
---|
| 700 | if(ncred !=1) { |
---|
| 701 | /* load issuer_ptr */ |
---|
[b7e77df] | 702 | if(issuer_ptr && abac_verifier_load_id_chars(ctxt_id_certs, issuer_ptr, NULL) != 0 /*ABAC_CERT_SUCCESS*/) |
---|
[ec550f7] | 703 | goto fail; |
---|
| 704 | } |
---|
[02036f4] | 705 | return newrv; |
---|
[461541a] | 706 | |
---|
| 707 | fail: |
---|
| 708 | /* Throw away all of rv if there's an error */ |
---|
| 709 | if ( rv ) { |
---|
| 710 | for (i = 0; i < ncred; i++) |
---|
| 711 | if (rv[i]) free(rv[i]); |
---|
| 712 | free(rv); |
---|
| 713 | } |
---|
| 714 | return NULL; |
---|
| 715 | } |
---|
| 716 | |
---|
[e50f807] | 717 | /* |
---|
| 718 | * If n has a child that is an element named name, return a pointer to it, |
---|
| 719 | * other wise return NULL. |
---|
| 720 | */ |
---|
| 721 | static xmlNodePtr get_direct_child(xmlNodePtr n, xmlChar *name) { |
---|
| 722 | xmlNodePtr c = NULL; |
---|
| 723 | |
---|
| 724 | if ( !n ) return NULL; |
---|
| 725 | |
---|
| 726 | for (c = n->children; c; c = c->next) { |
---|
| 727 | if ( c->type != XML_ELEMENT_NODE ) |
---|
| 728 | continue; |
---|
| 729 | if ( !strcmp((char *) c->name, (char *) name)) |
---|
| 730 | return c; |
---|
| 731 | } |
---|
| 732 | return NULL; |
---|
| 733 | } |
---|
| 734 | |
---|
[a2b9fd2] | 735 | /* |
---|
| 736 | * Convert a version 1.0 rt0 section to an RT0 string, returned in an array of |
---|
| 737 | * strings. This is just allocating the array and copying the string. RT0 1.0 |
---|
| 738 | * has no structure. |
---|
| 739 | */ |
---|
[d2b198c] | 740 | xmlChar **parse_rt0_xml_v10(xmlNodePtr n, abac_keyid_map_t *km) { |
---|
[e50f807] | 741 | xmlChar *txt; |
---|
| 742 | xmlChar **rv = NULL; |
---|
| 743 | |
---|
| 744 | /* read the RT0 and return it */ |
---|
| 745 | if ( !(txt = get_element_content(n)) ) return NULL; |
---|
| 746 | |
---|
| 747 | if ( !(rv = malloc(2 * sizeof(xmlChar *)))) return NULL; |
---|
| 748 | if (!(rv[0] = malloc(strlen((char *) txt)+1))) { |
---|
| 749 | free(rv); |
---|
| 750 | return NULL; |
---|
| 751 | } |
---|
| 752 | strcpy((char *) rv[0], (char *) txt); |
---|
| 753 | rv[1] = NULL; |
---|
| 754 | return rv; |
---|
| 755 | } |
---|
| 756 | |
---|
[a2b9fd2] | 757 | /* Return the length of the string pointed to by rn, ignoring whitespace */ |
---|
[e50f807] | 758 | static int role_len(xmlChar *rn) { |
---|
| 759 | xmlChar *p; |
---|
| 760 | int len = 0; |
---|
| 761 | |
---|
| 762 | for (p = rn; *p; p++) |
---|
| 763 | if ( !isspace(*p) ) len++; |
---|
| 764 | return len; |
---|
| 765 | } |
---|
| 766 | |
---|
[a2b9fd2] | 767 | /* Return the length of the RT0 string represented bt the RT0 1.1 term. That |
---|
| 768 | * term looks like: |
---|
| 769 | * <head> |
---|
| 770 | * <ABACprincipal><keyid>...</keyid><mnemonic>...</menmonic></ABACprincipal> |
---|
| 771 | * <role>...</role> |
---|
| 772 | * <linking_role>...</linking_role> |
---|
| 773 | * </head> |
---|
| 774 | * The container can be either a head or a tail, and the role and linking_role |
---|
| 775 | * are optional. The result is the number of non whitespace characters in the |
---|
| 776 | * keyid, role, and linking_role fields (if present) plus a dot to separate |
---|
| 777 | * each field. |
---|
| 778 | */ |
---|
[e50f807] | 779 | static int term_len(xmlNodePtr n) { |
---|
| 780 | int len = 0; |
---|
| 781 | xmlNodePtr c = NULL;/* Scratch */ |
---|
| 782 | |
---|
| 783 | for (c = n->children; c; c = c->next) { |
---|
| 784 | if ( c->type != XML_ELEMENT_NODE ) |
---|
| 785 | continue; |
---|
| 786 | if ( !strcmp((char *) c->name, "ABACprincipal")) { |
---|
| 787 | xmlNodePtr k = get_direct_child(c, "keyid"); |
---|
| 788 | if ( !k ) return -1; |
---|
| 789 | len += role_len(get_element_content(k)); |
---|
| 790 | } else if (!strcmp((char *) c->name, "role")) { |
---|
| 791 | len += role_len(get_element_content(c)) +1; |
---|
| 792 | } else if (!strcmp((char *) c->name, "linking_role")) { |
---|
| 793 | len += role_len(get_element_content(c)) +1; |
---|
| 794 | } |
---|
| 795 | } |
---|
| 796 | return len; |
---|
| 797 | } |
---|
| 798 | |
---|
[a2b9fd2] | 799 | /* Copy non-whitespace characters from rn to dest. Return the final vaue of |
---|
| 800 | * dest, but no guarantees are made about it. The caller must make sure there |
---|
| 801 | * is enough space in dest. |
---|
| 802 | */ |
---|
[e50f807] | 803 | static xmlChar *role_copy(xmlChar *rn, xmlChar *dest) { |
---|
| 804 | while (*rn) { |
---|
| 805 | if (!isspace(*rn)) *dest++ = *rn; |
---|
| 806 | rn++; |
---|
| 807 | } |
---|
| 808 | return dest; |
---|
| 809 | } |
---|
| 810 | |
---|
[a2b9fd2] | 811 | /* Turn the contents of the node pointer into a dotted string representation of |
---|
| 812 | * the RT0 term. For example |
---|
| 813 | * <tail> |
---|
| 814 | * <ABACprincipal><keyid>P</keyid><mnemonic>...</menmonic></ABACprincipal> |
---|
| 815 | * <role>r2</role> |
---|
| 816 | * <linking_role>r1</linking_role> |
---|
| 817 | * </tail> |
---|
| 818 | * becomes P.r1.r2. |
---|
[d2b198c] | 819 | * In addition, if there is a mnemonic in the ABACPrincipal field, add it to |
---|
| 820 | * the keyid_map (if there is a map). |
---|
[a2b9fd2] | 821 | */ |
---|
[d2b198c] | 822 | static xmlChar *term_copy(xmlNodePtr n, xmlChar *dest, abac_keyid_map_t *km) { |
---|
[e50f807] | 823 | xmlNodePtr p = get_direct_child(n, "ABACprincipal"); |
---|
[d2b198c] | 824 | xmlNodePtr k = NULL; |
---|
| 825 | xmlNodePtr m = NULL; |
---|
| 826 | char *ks = NULL; |
---|
| 827 | char *ms = NULL; |
---|
[e50f807] | 828 | |
---|
| 829 | if ( !p ) return NULL; |
---|
[d2b198c] | 830 | if ( !(k = get_direct_child(p, "keyid"))) return NULL; |
---|
| 831 | if ( !(ks = get_element_content(k))) return NULL; |
---|
| 832 | if ( !(dest = role_copy(ks, dest))) return NULL; |
---|
| 833 | /* If there's a mnemonic string, add the mapping from keyid to mnemonic to |
---|
| 834 | * the keymap */ |
---|
| 835 | if ( (m = get_direct_child(p, "mnemonic"))) { |
---|
| 836 | if ( (ms = get_element_content(m))) { |
---|
| 837 | abac_keyid_map_remove_keyid(km, ks); |
---|
| 838 | abac_keyid_map_add_nickname(km, ks, ms); |
---|
| 839 | } |
---|
| 840 | } |
---|
[e50f807] | 841 | if ( (p = get_direct_child(n, "linking_role"))) { |
---|
| 842 | *dest++ = '.'; |
---|
| 843 | if ( !(dest = role_copy(get_element_content(p), dest))) return NULL; |
---|
| 844 | } |
---|
| 845 | if ( (p = get_direct_child(n, "role"))) { |
---|
| 846 | *dest++ = '.'; |
---|
| 847 | if ( !(dest = role_copy(get_element_content(p), dest))) return NULL; |
---|
| 848 | } |
---|
| 849 | return dest; |
---|
| 850 | } |
---|
| 851 | |
---|
[a2b9fd2] | 852 | /* |
---|
| 853 | * Append at most sz characters from a to d and advance d by sz characters. No |
---|
| 854 | * checking is done. |
---|
| 855 | */ |
---|
[e50f807] | 856 | static xmlChar *append_and_move(xmlChar *d, xmlChar *a, int sz) { |
---|
[09aa249] | 857 | int i = 0; |
---|
| 858 | for ( i = 0; i < sz && a[i] != '\0'; i++) |
---|
| 859 | *d++ = a[i]; |
---|
| 860 | return d; |
---|
[e50f807] | 861 | } |
---|
| 862 | |
---|
[09aa249] | 863 | static void partial_string_dump(char *s, char *e) { |
---|
| 864 | for (; s!= e; s++) |
---|
| 865 | fprintf(stderr, "%c", *s); |
---|
| 866 | fprintf(stderr, "\n"); |
---|
| 867 | } |
---|
| 868 | |
---|
| 869 | |
---|
[a2b9fd2] | 870 | /* |
---|
| 871 | * Parse a structured RT0 v 1.1 xml into an RT0 string. For example |
---|
| 872 | * <head> |
---|
| 873 | * <ABACprincipal><keyid>A</keyid><mnemonic>...</menmonic></ABACprincipal> |
---|
| 874 | * <role>r</role> |
---|
| 875 | * </head> |
---|
| 876 | * <tail> |
---|
| 877 | * <ABACprincipal><keyid>B</keyid><mnemonic>...</menmonic></ABACprincipal> |
---|
| 878 | * <role>r2</role> |
---|
| 879 | * <linking_role>r1</linking_role> |
---|
| 880 | * </tail> |
---|
| 881 | * <tail> |
---|
| 882 | * <ABACprincipal><keyid>C</keyid><mnemonic>...</menmonic></ABACprincipal> |
---|
| 883 | * <role>r2</role> |
---|
| 884 | * </tail> |
---|
| 885 | * |
---|
| 886 | * Converts to A.r<-B.r1.r2 & C.r2 |
---|
| 887 | */ |
---|
[d2b198c] | 888 | xmlChar **parse_rt0_xml_v11(xmlNodePtr n, abac_keyid_map_t *km) { |
---|
[09aa249] | 889 | int len = 3; /* Length of the RT0 string we're building. Initially 3 for |
---|
[e50f807] | 890 | the <- and end-of-string */ |
---|
| 891 | int heads = 0; /* number of tails so far */ |
---|
| 892 | int tails = 0; /* number of tails so far */ |
---|
| 893 | xmlNodePtr c = NULL;/* Scratch */ |
---|
| 894 | xmlChar **rv = NULL; |
---|
| 895 | xmlChar *d = NULL; |
---|
| 896 | |
---|
[a2b9fd2] | 897 | /* Compute the length of the new string and make sure we have a head and at |
---|
| 898 | * least one tail. |
---|
| 899 | */ |
---|
[e50f807] | 900 | if ( !n ) return NULL; |
---|
| 901 | |
---|
| 902 | for (c = n->children; c; c = c->next) { |
---|
| 903 | if ( c->type != XML_ELEMENT_NODE ) |
---|
| 904 | continue; |
---|
| 905 | if ( !strcmp((char *) c->name, "head") ) { |
---|
| 906 | len += term_len(c); |
---|
| 907 | heads ++; |
---|
| 908 | } else if (!strcmp((char *) c->name, "tail")) { |
---|
| 909 | len += term_len(c); |
---|
| 910 | /* if more than one tail, add space for " & " */ |
---|
| 911 | if ( tails++) len += 3; |
---|
| 912 | } |
---|
| 913 | } |
---|
| 914 | if ( heads != 1 || tails < 1) return NULL; |
---|
[a2b9fd2] | 915 | |
---|
| 916 | /* Allocate the return value */ |
---|
[e50f807] | 917 | if ( !(rv = malloc(2 * sizeof(xmlChar *)))) return NULL; |
---|
| 918 | if (!(rv[0] = malloc(len)) ) { |
---|
| 919 | free(rv); |
---|
| 920 | return NULL; |
---|
| 921 | } |
---|
[b7e77df] | 922 | rv[1] = NULL; |
---|
[a2b9fd2] | 923 | |
---|
| 924 | /* Translate term by term */ |
---|
[e50f807] | 925 | d = rv[0]; |
---|
| 926 | if ( !( c = get_direct_child(n, "head"))) goto fail; |
---|
[d2b198c] | 927 | if ( !(d = term_copy(c, d, km))) goto fail; |
---|
[e50f807] | 928 | d = append_and_move(d, "<-", 2); |
---|
| 929 | tails = 0; |
---|
| 930 | for (c = n->children; c; c = c->next) { |
---|
| 931 | if ( c->type != XML_ELEMENT_NODE ) |
---|
| 932 | continue; |
---|
| 933 | if ( !strcmp((char *) c->name, "tail") ) { |
---|
| 934 | /* if more than one tail, add " & " */ |
---|
| 935 | if ( tails++) |
---|
| 936 | d = append_and_move(d, " & ", 3); |
---|
[d2b198c] | 937 | if ( !(d = term_copy(c, d, km))) goto fail; |
---|
[e50f807] | 938 | } |
---|
| 939 | } |
---|
[09aa249] | 940 | *d++ = '\0'; |
---|
[e50f807] | 941 | return rv; |
---|
| 942 | |
---|
| 943 | fail: |
---|
| 944 | free(rv[0]); |
---|
| 945 | free(rv); |
---|
| 946 | return NULL; |
---|
| 947 | } |
---|
[461541a] | 948 | /* |
---|
| 949 | * Parse an ABAC credential (that has had its signature checked. Make sure it |
---|
[a2b9fd2] | 950 | * has not expired and that its version is one we know. Return the RT0 it |
---|
| 951 | * encodes as the only entry in an NULL-terminated array of strings (just like |
---|
| 952 | * parse_privilege). On failure return NULL. In addition to parsing the |
---|
| 953 | * certificate, we add the issuer's identity from the signature to the |
---|
| 954 | * controlling context, if any. ctxt_id_certs is the list of certificates to |
---|
| 955 | * which the new certificate is added. |
---|
| 956 | */ |
---|
[d2b198c] | 957 | xmlChar **parse_abac(xmlDocPtr doc, void *ctxt_id_certs, abac_keyid_map_t *km) { |
---|
[461541a] | 958 | xmlNodePtr root = NULL; /* XML root node */ |
---|
| 959 | xmlNodePtr node = NULL; /* XML credential node */ |
---|
| 960 | xmlNodePtr rt0 = NULL; /* XML rt0 node */ |
---|
| 961 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
| 962 | xmlNodePtr version = NULL; /* XML version node */ |
---|
| 963 | xmlChar keyid[SHA_DIGEST_LENGTH];/* issuer SHA1 hash */ |
---|
| 964 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid in text */ |
---|
| 965 | xmlChar *txt; /* rt0 content */ |
---|
| 966 | xmlChar **rv = NULL; /* return value */ |
---|
[a2b9fd2] | 967 | xmlChar *issuer_ptr=NULL; /* Issuer certificate to add to ctxt_id_certs */ |
---|
[e50f807] | 968 | GENI_xml_processing_t *proc = NULL; /* Specialization for version number */ |
---|
[461541a] | 969 | int ncred = 0; /* number of creds in rv */ |
---|
| 970 | int i = 0; /* Scratch (used only in fail:) */ |
---|
| 971 | |
---|
| 972 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
---|
| 973 | goto fail; |
---|
| 974 | |
---|
| 975 | /* Get the issuer keyid */ |
---|
| 976 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
| 977 | goto fail; |
---|
| 978 | sha1_to_text(keyid, text_keyid); |
---|
| 979 | /* get the various nodes of interest */ |
---|
| 980 | if ( !(node = xmlSecFindNode(root, (xmlChar *) GENI_credential, NULL))) |
---|
| 981 | goto fail; |
---|
[e50f807] | 982 | if ( !(expires = get_direct_child(node, (xmlChar *) GENI_expires))) |
---|
[461541a] | 983 | goto fail; |
---|
[e50f807] | 984 | if ( !check_GENI_expires(get_element_content(expires), NULL)) |
---|
[461541a] | 985 | goto fail; |
---|
| 986 | |
---|
[94605f2] | 987 | if ( !(rt0 = get_direct_child(node, (xmlChar *) GENI_rt0))) { |
---|
| 988 | if ( !(rt0 = get_direct_child(node, (xmlChar *) GENI_abac))) |
---|
| 989 | goto fail; |
---|
| 990 | if ( !(rt0 = get_direct_child(rt0, (xmlChar *) GENI_rt0))) |
---|
| 991 | goto fail; |
---|
| 992 | } |
---|
| 993 | |
---|
[e50f807] | 994 | /* There are two places to look for a version. The credential node and the |
---|
| 995 | * rt0 node that is a child of the credential node. The version element is |
---|
| 996 | * only under the credential in the misdefined GENI abac v1.0. */ |
---|
| 997 | if ( !(version = get_direct_child(node, (xmlChar *) GENI_version))) { |
---|
| 998 | if ( !(version = get_direct_child(rt0, (xmlChar *) GENI_version))) |
---|
| 999 | goto fail; |
---|
| 1000 | } |
---|
| 1001 | |
---|
[94605f2] | 1002 | |
---|
[e50f807] | 1003 | /* Pick parsing specialization based on the version. If we can't resolve a |
---|
| 1004 | * processor, this is an unknown version. */ |
---|
| 1005 | if ( !(proc = get_xml_processing(get_element_content(version)))) |
---|
[461541a] | 1006 | goto fail; |
---|
| 1007 | |
---|
| 1008 | /* read the RT0 and return it */ |
---|
[d2b198c] | 1009 | if ( !(rv = proc->xml_to_rt0(rt0, km)) ) goto fail; |
---|
[e50f807] | 1010 | ncred=1; |
---|
[461541a] | 1011 | |
---|
[ec550f7] | 1012 | /* extract issuer pem and insert */ |
---|
[a2b9fd2] | 1013 | issuer_ptr=get_issuer(doc); |
---|
| 1014 | if( issuer_ptr && |
---|
[b7e77df] | 1015 | abac_verifier_load_id_chars(ctxt_id_certs,issuer_ptr, NULL) != |
---|
[a2b9fd2] | 1016 | ABAC_CERT_SUCCESS) { |
---|
[ec550f7] | 1017 | goto fail; |
---|
| 1018 | } |
---|
| 1019 | |
---|
[461541a] | 1020 | return rv; |
---|
| 1021 | fail: |
---|
| 1022 | if ( rv ) { |
---|
| 1023 | for (i = 0; i < ncred; i++) |
---|
| 1024 | if (rv[i]) free(rv[i]); |
---|
| 1025 | free(rv); |
---|
| 1026 | } |
---|
| 1027 | return NULL; |
---|
| 1028 | } |
---|
| 1029 | |
---|
| 1030 | /* Check and parse a GENI credential. Return the new RT0 rules in a |
---|
| 1031 | * NULL-terminated array of strings. If the signature or parsing fails, return |
---|
| 1032 | * NULL. Demultiplexed to parse_privilege or parse_abac to do the parsing and |
---|
[a2b9fd2] | 1033 | * uses check_signature to confirm the sig. If ctxt_id_certs is a list of |
---|
| 1034 | * identities known to a context. If it is not NULL and identity certs appear |
---|
| 1035 | * (as they do in GENI credentials) add them to that list, which adds them to |
---|
| 1036 | * the ABAC context. */ |
---|
[e50f807] | 1037 | char **read_credential(void *ctxt_id_certs, char *infile, |
---|
[d2b198c] | 1038 | char **in_xml, abac_keyid_map_t *km) { |
---|
[bc12f3d] | 1039 | xmlChar **xml = (xmlChar **) in_xml; /* Cast */ |
---|
[461541a] | 1040 | xmlDocPtr doc = xmlParseFile(infile); /* Parse the document */ |
---|
| 1041 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
| 1042 | xmlChar *text = NULL; /* Text of the type field */ |
---|
| 1043 | xmlChar **rv = NULL; /* return value from parse_* */ |
---|
| 1044 | |
---|
| 1045 | if ( !check_signature(doc) ) |
---|
| 1046 | goto fail; |
---|
| 1047 | /* Parse out the type field */ |
---|
| 1048 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
| 1049 | goto fail; |
---|
| 1050 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_credential, NULL))) |
---|
| 1051 | goto fail; |
---|
| 1052 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_type, NULL))) |
---|
| 1053 | goto fail; |
---|
| 1054 | |
---|
| 1055 | if ( !(text = get_element_content(node)) ) |
---|
| 1056 | goto fail; |
---|
| 1057 | |
---|
| 1058 | /* Demux on type */ |
---|
| 1059 | if ( !strcmp((char *) text, "privilege")) { |
---|
[d2b198c] | 1060 | rv = parse_privilege(doc, ctxt_id_certs, km); |
---|
[461541a] | 1061 | } else if ( !strcmp((char *) text, "abac")) { |
---|
[d2b198c] | 1062 | rv = parse_abac(doc, ctxt_id_certs, km); |
---|
[461541a] | 1063 | } else { |
---|
| 1064 | goto fail; |
---|
| 1065 | } |
---|
| 1066 | int len=0; |
---|
| 1067 | xmlDocDumpMemoryEnc(doc, xml, &len, "UTF-8"); |
---|
| 1068 | if(len == 0) |
---|
| 1069 | goto fail; |
---|
| 1070 | |
---|
| 1071 | fail: |
---|
| 1072 | xmlFreeDoc(doc); |
---|
[e50f807] | 1073 | return (char **) rv; |
---|
[461541a] | 1074 | } |
---|
| 1075 | |
---|
| 1076 | |
---|
[a2b9fd2] | 1077 | /* format for dates in <expires> */ |
---|
[461541a] | 1078 | char *strftime_fmt = "%FT%TZ"; |
---|
| 1079 | #define EXPIRESLEN 20 |
---|
| 1080 | |
---|
| 1081 | /* Return a copy of str with > < and & replaced by > < and & for |
---|
| 1082 | * embedding in XML. Caller is responsible for deallocating the return value |
---|
| 1083 | * using xmlFree(). |
---|
| 1084 | */ |
---|
[9e063cb] | 1085 | static xmlChar *minimal_xml_escaping(xmlChar *str) { |
---|
[461541a] | 1086 | /* A quickie translation table with the character to escape, the output |
---|
| 1087 | * string and the length of the output in it. The table is initialized with |
---|
| 1088 | * the three translations we want. */ |
---|
| 1089 | static struct esc { |
---|
| 1090 | xmlChar c; |
---|
| 1091 | xmlChar *esc; |
---|
| 1092 | int l; |
---|
| 1093 | } escapes[] = { |
---|
| 1094 | { (xmlChar) '<', (xmlChar *) "<", 4 }, |
---|
| 1095 | { (xmlChar) '>', (xmlChar *) ">", 4}, |
---|
| 1096 | { (xmlChar) '&', (xmlChar *) "&", 5}, |
---|
| 1097 | { (xmlChar) '\0', NULL, 0 }, |
---|
| 1098 | }; |
---|
| 1099 | |
---|
| 1100 | xmlChar *rv = NULL; /* Return value */ |
---|
| 1101 | xmlChar *p = NULL; /* Scratch (walking str) */ |
---|
| 1102 | xmlChar *q = NULL; /* Scratch (walking rv) */ |
---|
| 1103 | struct esc *e = NULL; /* Scratch for walking escapes */ |
---|
| 1104 | int len = 0; /* Length of rv */ |
---|
| 1105 | |
---|
| 1106 | /* Walk str and calculate how long the escaped version is */ |
---|
| 1107 | for ( p = str; *p ; p++) { |
---|
| 1108 | int foundit = 0; |
---|
| 1109 | for ( e = escapes; !foundit && e->c ; e++ ) { |
---|
| 1110 | if ( *p == e->c ) { |
---|
| 1111 | len += e->l; |
---|
| 1112 | foundit = 1; |
---|
| 1113 | } |
---|
| 1114 | } |
---|
| 1115 | if ( !foundit ) len++; |
---|
| 1116 | } |
---|
| 1117 | /* Allocate the new string */ |
---|
| 1118 | q = rv = (xmlChar *) xmlMalloc(len+1); |
---|
| 1119 | /* copy str to rv, escaping when necessary */ |
---|
| 1120 | for ( p = str; *p ; p++) { |
---|
| 1121 | int foundit = 0; |
---|
| 1122 | for ( e = escapes; !foundit && e->c ; e++ ) { |
---|
| 1123 | if ( *p == e->c ) { |
---|
| 1124 | strncpy((char *) q, (char *) e->esc, e->l); |
---|
| 1125 | q += e->l; |
---|
| 1126 | foundit = 1; |
---|
| 1127 | } |
---|
| 1128 | } |
---|
| 1129 | if ( !foundit ) *q++ = *p; |
---|
| 1130 | } |
---|
| 1131 | /* terminate rv */ |
---|
| 1132 | *q = '\0'; |
---|
| 1133 | return rv; |
---|
| 1134 | } |
---|
| 1135 | |
---|
[e50f807] | 1136 | xmlChar *encode_rt0_xml_v10(abac_attribute_t *a) { |
---|
| 1137 | return minimal_xml_escaping(abac_attribute_role_string(a)); |
---|
| 1138 | } |
---|
| 1139 | |
---|
[a2b9fd2] | 1140 | /* Template to create a head element in structured XML for RT0 (v1.1). All |
---|
[afcafea] | 1141 | * heads are a single role element. There aer versions with and without |
---|
| 1142 | * mnemonics. */ |
---|
[e50f807] | 1143 | static char *head_template = |
---|
| 1144 | "<head>\n" |
---|
| 1145 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
| 1146 | " <role>%s</role>\n" |
---|
| 1147 | "</head>\n"; |
---|
| 1148 | |
---|
[afcafea] | 1149 | static char *head_template_w_mnemonic = |
---|
| 1150 | "<head>\n" |
---|
| 1151 | " <ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n" |
---|
| 1152 | " <role>%s</role>\n" |
---|
| 1153 | "</head>\n"; |
---|
| 1154 | |
---|
[a2b9fd2] | 1155 | /* Templates to create a tail in structured XML based on how many of |
---|
[afcafea] | 1156 | * principal, role, and linking role are present. There are variants with |
---|
| 1157 | * and without mnomonics. */ |
---|
[e50f807] | 1158 | static char *tail_template[] = { |
---|
| 1159 | "<tail>\n" |
---|
| 1160 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
| 1161 | "</tail>\n", |
---|
| 1162 | "<tail>\n" |
---|
| 1163 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
| 1164 | " <role>%s</role>\n" |
---|
| 1165 | "</tail>\n", |
---|
| 1166 | "<tail>\n" |
---|
| 1167 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
| 1168 | " <role>%s</role>\n" |
---|
| 1169 | " <linking_role>%s</linking_role>\n" |
---|
| 1170 | "</tail>\n", |
---|
| 1171 | }; |
---|
[afcafea] | 1172 | static char *tail_template_w_mnemonic[] = { |
---|
| 1173 | "<tail>\n" |
---|
| 1174 | " <ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n" |
---|
| 1175 | "</tail>\n", |
---|
| 1176 | "<tail>\n" |
---|
| 1177 | " <ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n" |
---|
| 1178 | " <role>%s</role>\n" |
---|
| 1179 | "</tail>\n", |
---|
| 1180 | "<tail>\n" |
---|
| 1181 | " <ABACprincipal><keyid>%s</keyid><mnemonic>%s</mnemonic></ABACprincipal>\n" |
---|
| 1182 | " <role>%s</role>\n" |
---|
| 1183 | " <linking_role>%s</linking_role>\n" |
---|
| 1184 | "</tail>\n", |
---|
| 1185 | }; |
---|
| 1186 | |
---|
| 1187 | /* These three functions are variations on the theme of printing out the XML |
---|
| 1188 | * representation of tail roles in the XML credential. They're separated out |
---|
| 1189 | * to make reading encode_rt0_xml_v11 a little easier. Each prints the role |
---|
| 1190 | * (r) into the string tmp, adding mnemonic annotations from km if present. Sz |
---|
| 1191 | * is the number of bytes remaining in the overall string, and is always |
---|
| 1192 | * smaller than the size of tmp. The only differences are which templates are |
---|
| 1193 | * used and how many strings are inserted. The length of the generated string |
---|
| 1194 | * is returned. |
---|
| 1195 | */ |
---|
| 1196 | static int encode_principal_role(abac_role_t *r, char *tmp, int sz, |
---|
| 1197 | abac_keyid_map_t *km) { |
---|
| 1198 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
| 1199 | char *nick = NULL; |
---|
| 1200 | int ts = 0; |
---|
| 1201 | |
---|
| 1202 | if ( km ) |
---|
| 1203 | nick = abac_keyid_map_key_to_nickname(km, p); |
---|
| 1204 | |
---|
| 1205 | if (nick) { |
---|
| 1206 | ts = snprintf(tmp, sz, tail_template_w_mnemonic[0], p, nick); |
---|
| 1207 | free(nick); |
---|
| 1208 | nick = NULL; |
---|
| 1209 | } |
---|
| 1210 | else { |
---|
| 1211 | ts = snprintf(tmp, sz, tail_template[0], p); |
---|
| 1212 | } |
---|
| 1213 | free(p); |
---|
| 1214 | return ts; |
---|
| 1215 | } |
---|
| 1216 | |
---|
| 1217 | static int encode_single_role(abac_role_t *r, char *tmp, int sz, |
---|
| 1218 | abac_keyid_map_t *km) { |
---|
| 1219 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
| 1220 | char *ro = minimal_xml_escaping(abac_role_role_name(r)); |
---|
| 1221 | char *nick = NULL; |
---|
| 1222 | int ts = 0; |
---|
| 1223 | |
---|
| 1224 | if ( km ) |
---|
| 1225 | nick = abac_keyid_map_key_to_nickname(km, p); |
---|
| 1226 | |
---|
| 1227 | if (nick) { |
---|
| 1228 | ts = snprintf(tmp, sz, tail_template_w_mnemonic[0], |
---|
| 1229 | p, nick, ro); |
---|
| 1230 | free(nick); |
---|
| 1231 | nick = NULL; |
---|
| 1232 | } |
---|
| 1233 | else { |
---|
| 1234 | ts = snprintf(tmp, sz, tail_template[1], p, ro); |
---|
| 1235 | } |
---|
| 1236 | free(p); |
---|
| 1237 | free(ro); |
---|
| 1238 | return ts; |
---|
| 1239 | } |
---|
| 1240 | |
---|
| 1241 | static int encode_linking_role(abac_role_t *r, char *tmp, int sz, |
---|
| 1242 | abac_keyid_map_t *km) { |
---|
| 1243 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
| 1244 | char *ro = minimal_xml_escaping(abac_role_role_name(r)); |
---|
| 1245 | char *li = minimal_xml_escaping(abac_role_linking_role(r)); |
---|
| 1246 | char *nick = NULL; |
---|
| 1247 | int ts = 0; |
---|
| 1248 | |
---|
| 1249 | if ( km ) |
---|
| 1250 | nick = abac_keyid_map_key_to_nickname(km, p); |
---|
| 1251 | |
---|
| 1252 | if (nick) { |
---|
| 1253 | ts = snprintf(tmp, sz, tail_template_w_mnemonic[2], |
---|
| 1254 | p, nick, ro, li); |
---|
| 1255 | free(nick); |
---|
| 1256 | nick = NULL; |
---|
| 1257 | } |
---|
| 1258 | else { |
---|
| 1259 | ts = snprintf(tmp, sz, tail_template[2], p, ro, li); |
---|
| 1260 | } |
---|
| 1261 | free(p); |
---|
| 1262 | free(ro); |
---|
| 1263 | free(li); |
---|
| 1264 | return ts; |
---|
| 1265 | } |
---|
[e50f807] | 1266 | |
---|
[a2b9fd2] | 1267 | /* Convert the given attribute to the RT0 structured XML representation used by |
---|
| 1268 | * version 1.1 credentials. |
---|
| 1269 | */ |
---|
[e50f807] | 1270 | xmlChar *encode_rt0_xml_v11(abac_attribute_t *a) { |
---|
[afcafea] | 1271 | int htlen = strlen(head_template_w_mnemonic); /* head template length */ |
---|
| 1272 | int ttlen = strlen(tail_template_w_mnemonic[2]); /* length of the longest |
---|
| 1273 | tail template */ |
---|
[a2b9fd2] | 1274 | /* Size of the string we'll need - start with a head template and string */ |
---|
[e50f807] | 1275 | int sz = strlen(abac_attribute_get_head(a)) + htlen; |
---|
[a2b9fd2] | 1276 | /* Number of tails in the sttribute */ |
---|
[e50f807] | 1277 | int ntails = abac_attribute_get_ntails(a); |
---|
[a2b9fd2] | 1278 | char *princ_role[2]; /* Used to split the head role */ |
---|
| 1279 | char *copy = abac_xstrdup(abac_attribute_get_head(a)); /* splitting */ |
---|
| 1280 | int npr = 2; /* Number of parts in the head role */ |
---|
[afcafea] | 1281 | abac_keyid_map_t *km = (a) ? abac_attribute_get_keyid_map(a) : NULL; |
---|
| 1282 | char *nick = NULL; /* Mnemonic name */ |
---|
[a2b9fd2] | 1283 | char *tmp = NULL; /* A temporary to build each tail element */ |
---|
| 1284 | char *rv = NULL; /* The return value */ |
---|
| 1285 | int i; /* Scratch */ |
---|
| 1286 | |
---|
| 1287 | /* Add the tail lengths to the total length (assume all tails will need the |
---|
| 1288 | * largest template for slop). */ |
---|
[e50f807] | 1289 | for ( i = 0 ; i < ntails; i++) |
---|
| 1290 | sz += strlen(abac_attribute_get_tail_n(a, i)) + ttlen; |
---|
| 1291 | |
---|
[a2b9fd2] | 1292 | /* Get the rv and scratch string. Since tmp is as long as the whole |
---|
| 1293 | * string, it's big enough for any substring */ |
---|
[e50f807] | 1294 | if ( !(rv = (char *) xmlMalloc(sz)) ) goto fail; |
---|
| 1295 | if ( !(tmp = (char *) xmlMalloc(sz)) ) goto fail; |
---|
| 1296 | |
---|
| 1297 | abac_split(copy, ".", princ_role, &npr); |
---|
| 1298 | if ( npr != 2) |
---|
| 1299 | goto fail; |
---|
| 1300 | |
---|
[afcafea] | 1301 | if ( km ) |
---|
| 1302 | nick = abac_keyid_map_key_to_nickname(km, princ_role[0]); |
---|
[a2b9fd2] | 1303 | /* Put the head in */ |
---|
[afcafea] | 1304 | if ( nick ) { |
---|
| 1305 | sz -= snprintf(rv, sz, head_template_w_mnemonic, princ_role[0], |
---|
| 1306 | nick, princ_role[1]); |
---|
| 1307 | free(nick); |
---|
| 1308 | nick = NULL; |
---|
| 1309 | } else { |
---|
| 1310 | sz -= snprintf(rv, sz, head_template, princ_role[0], princ_role[1]); |
---|
| 1311 | } |
---|
[e50f807] | 1312 | |
---|
| 1313 | for ( i = 0 ; i < ntails; i++) { |
---|
[a2b9fd2] | 1314 | /* Make a role for each tail and use those functions to write out the |
---|
| 1315 | * structures for the different kinds of role. */ |
---|
[e50f807] | 1316 | abac_role_t *r = abac_role_from_string(abac_attribute_get_tail_n(a,i)); |
---|
| 1317 | int ts; |
---|
| 1318 | |
---|
| 1319 | if ( !r ) |
---|
| 1320 | goto fail; |
---|
| 1321 | |
---|
[afcafea] | 1322 | if ( abac_role_is_principal(r)) |
---|
| 1323 | ts = encode_principal_role(r, tmp, sz, km); |
---|
| 1324 | else if (abac_role_is_role(r)) |
---|
| 1325 | ts = encode_single_role(r, tmp, sz, km); |
---|
| 1326 | else if (abac_role_is_linking(r)) |
---|
| 1327 | ts = encode_linking_role(r, tmp, sz, km); |
---|
[e50f807] | 1328 | |
---|
| 1329 | free(r); |
---|
| 1330 | if ( ts < 0 ) |
---|
| 1331 | goto fail; |
---|
| 1332 | |
---|
| 1333 | strncat(rv, tmp, sz); |
---|
| 1334 | sz -= ts; |
---|
| 1335 | } |
---|
| 1336 | free(tmp); |
---|
| 1337 | return (xmlChar *) rv; |
---|
| 1338 | |
---|
| 1339 | fail: |
---|
| 1340 | if (rv ) free(rv); |
---|
| 1341 | if (tmp) free(tmp); |
---|
| 1342 | return NULL; |
---|
| 1343 | } |
---|
| 1344 | |
---|
[461541a] | 1345 | /* Make an new GENI abac credential with the rt0 rule that expires secs from |
---|
| 1346 | * now. cert is the PEM encoded X.509 of the issuer's certificate as a string. |
---|
| 1347 | * certlen is the length of cert. Returns the XML. Caller is responsible for |
---|
| 1348 | * freeing it. */ |
---|
[e50f807] | 1349 | char *make_credential(abac_attribute_t *attr, int secs, char *in_cert, |
---|
| 1350 | int in_certlen) { |
---|
| 1351 | xmlSecByte *cert = (xmlSecByte *) in_cert; /* Cast of certificate */ |
---|
| 1352 | xmlSecSize certlen = (xmlSecSize) in_certlen; /* Cast of len */ |
---|
[461541a] | 1353 | xmlDocPtr doc = NULL; /* parsed XML document */ |
---|
| 1354 | xmlNodePtr root = NULL; /* Root of the document */ |
---|
| 1355 | xmlNodePtr signNode = NULL; /* <Signature> element */ |
---|
| 1356 | xmlSecDSigCtxPtr dsigCtx = NULL; /* Signing context */ |
---|
[e50f807] | 1357 | xmlChar *rt0_xml = NULL; /* attr's RT0 as xml */ |
---|
[461541a] | 1358 | xmlChar *rv = NULL; /* return value */ |
---|
| 1359 | time_t exp; /* expriation time (seconds since epoch) */ |
---|
| 1360 | struct tm exp_tm; /* expiration for formatting */ |
---|
| 1361 | char estr[EXPIRESLEN+1]; /* String with formatted expiration */ |
---|
| 1362 | char *temp = NULL; /* populated XML template */ |
---|
| 1363 | int len = 0; /* length of the populated template (temp) */ |
---|
| 1364 | |
---|
[bc12f3d] | 1365 | GENI_xml_processing_t *proc = get_xml_processing( |
---|
| 1366 | abac_attribute_get_output_format(attr)); |
---|
[e50f807] | 1367 | |
---|
| 1368 | if ( !proc ) goto fail; |
---|
| 1369 | if ( !(rt0_xml = proc->rt0_to_xml(attr))) goto fail; |
---|
[461541a] | 1370 | |
---|
| 1371 | /* Calculate the length of the populated template and allocate it */ |
---|
[e50f807] | 1372 | len = strlen((char *) proc->out_template)+EXPIRESLEN+ |
---|
| 1373 | strlen((char *) rt0_xml)+1; |
---|
[461541a] | 1374 | |
---|
| 1375 | if ( !(temp = malloc(len)) ) |
---|
| 1376 | goto fail; |
---|
| 1377 | |
---|
| 1378 | /* format expiration */ |
---|
| 1379 | time(&exp); |
---|
| 1380 | exp += secs; |
---|
| 1381 | gmtime_r(&exp, &exp_tm); |
---|
| 1382 | |
---|
| 1383 | if (strftime(estr, EXPIRESLEN+1, strftime_fmt, &exp_tm) == 0 ) |
---|
| 1384 | goto fail; |
---|
| 1385 | |
---|
| 1386 | /* Populate template with expiration and escaped rt0 */ |
---|
[e50f807] | 1387 | snprintf(temp, len, proc->out_template, estr, (char *) rt0_xml); |
---|
[461541a] | 1388 | |
---|
| 1389 | /* parse the populated template */ |
---|
| 1390 | if ( !(doc = xmlParseMemory(temp, len))) |
---|
| 1391 | goto fail; |
---|
| 1392 | |
---|
| 1393 | if (!(root = xmlDocGetRootElement(doc)) ) |
---|
| 1394 | goto fail; |
---|
| 1395 | |
---|
| 1396 | /* Find the signature element for the Signing call */ |
---|
| 1397 | signNode = xmlSecFindNode(root, xmlSecNodeSignature, xmlSecDSigNs); |
---|
| 1398 | |
---|
| 1399 | /* Create the context */ |
---|
| 1400 | if ( !(dsigCtx = xmlSecDSigCtxCreate(NULL))) |
---|
| 1401 | goto fail; |
---|
| 1402 | |
---|
| 1403 | /* Assign the key (a PEM key) */ |
---|
| 1404 | if (!(dsigCtx->signKey = xmlSecCryptoAppKeyLoadMemory(cert, certlen, |
---|
| 1405 | xmlSecKeyDataFormatPem, NULL, NULL, NULL)) ) |
---|
| 1406 | goto fail; |
---|
| 1407 | |
---|
| 1408 | /* Load the certificate */ |
---|
| 1409 | if ( xmlSecCryptoAppKeyCertLoadMemory(dsigCtx->signKey, cert, certlen, |
---|
| 1410 | xmlSecKeyDataFormatPem) < 0) |
---|
| 1411 | goto fail; |
---|
| 1412 | |
---|
| 1413 | /* Sign it */ |
---|
| 1414 | if ( xmlSecDSigCtxSign(dsigCtx, signNode) < 0) |
---|
| 1415 | goto fail; |
---|
| 1416 | |
---|
| 1417 | /* Store the signed credential to rv */ |
---|
| 1418 | xmlDocDumpMemoryEnc(doc, &rv, &len, "UTF-8"); |
---|
| 1419 | fail: |
---|
| 1420 | /* clean up */ |
---|
| 1421 | if (dsigCtx) |
---|
| 1422 | xmlSecDSigCtxDestroy(dsigCtx); |
---|
| 1423 | if ( doc) xmlFreeDoc(doc); |
---|
[e50f807] | 1424 | if (rt0_xml) xmlFree(rt0_xml); |
---|
[461541a] | 1425 | if ( temp) free(temp); |
---|
| 1426 | return (char *) rv; |
---|
| 1427 | } |
---|
| 1428 | |
---|
| 1429 | #define CERTSIZE 4096 |
---|
| 1430 | /* Read a file into a the dynamically allocated array buf. Whatever was in buf |
---|
| 1431 | * is discarded w/o freeing so it should initially be NULL and len 0. On return |
---|
| 1432 | * buf contains as much of the contents of filename as possible and len is the |
---|
| 1433 | * length of it. The caller must free() buf. buf is zero terminated.*/ |
---|
[9e063cb] | 1434 | static void read_cert(char *filename, char **buf, int *len) { |
---|
[461541a] | 1435 | FILE *cert = NULL; |
---|
| 1436 | char *nbuf = NULL; |
---|
| 1437 | int cap = CERTSIZE; |
---|
| 1438 | int r = 0; |
---|
| 1439 | |
---|
| 1440 | *len = 0; |
---|
| 1441 | if (!(*buf = malloc(CERTSIZE))) return; |
---|
| 1442 | |
---|
| 1443 | if ( !(cert = fopen(filename, "r"))) |
---|
| 1444 | goto fail; |
---|
| 1445 | |
---|
| 1446 | /* Read cert, expanding buf as necessary */ |
---|
| 1447 | while ( (r = fread(*buf + *len, 1, cap - *len, cert)) != 0) { |
---|
| 1448 | *len += r; |
---|
| 1449 | if ( *len == cap ) { |
---|
| 1450 | if ( !(nbuf = realloc(*buf, cap + CERTSIZE)) ) |
---|
| 1451 | goto fail; |
---|
| 1452 | memcpy(nbuf, *buf, cap); |
---|
| 1453 | cap += CERTSIZE; |
---|
| 1454 | *buf = nbuf; |
---|
| 1455 | } |
---|
| 1456 | } |
---|
| 1457 | /* Extend if we read exactly cap bytes so we can terminate the string */ |
---|
| 1458 | if ( *len == cap ) { |
---|
| 1459 | if ( !(nbuf = realloc(*buf, cap + CERTSIZE)) ) |
---|
| 1460 | goto fail; |
---|
| 1461 | memcpy(nbuf, *buf, cap); |
---|
| 1462 | cap += CERTSIZE; |
---|
| 1463 | *buf = nbuf; |
---|
| 1464 | } |
---|
| 1465 | (*buf)[*len] = '\0'; |
---|
| 1466 | return; |
---|
| 1467 | fail: |
---|
| 1468 | if ( *buf) free(*buf); |
---|
| 1469 | *buf = NULL; |
---|
| 1470 | *len = 0; |
---|
| 1471 | return; |
---|
| 1472 | } |
---|
| 1473 | |
---|
| 1474 | |
---|
[9e063cb] | 1475 | /******** helper functions used by libabac **********************/ |
---|
| 1476 | |
---|
[95b150a] | 1477 | /* Function to disable libXML2's debugging */ |
---|
| 1478 | static void _nullGenericErrorFunc(void* ctxt, const char* msg, ...) { return; } |
---|
| 1479 | |
---|
[9e063cb] | 1480 | /* Straight off http://www.aleksey.com/xmlsec/api/xmlsec-examples.html . |
---|
| 1481 | * Voodoo. But call it. */ |
---|
| 1482 | int init_xmlsec() { |
---|
| 1483 | /* Init xmlsec library */ |
---|
| 1484 | if(xmlSecInit() < 0) { |
---|
| 1485 | fprintf(stderr, "Error: xmlsec initialization failed.\n"); |
---|
| 1486 | return(-1); |
---|
| 1487 | } |
---|
| 1488 | |
---|
| 1489 | /* Check loaded library version */ |
---|
| 1490 | if(xmlSecCheckVersion() != 1) { |
---|
| 1491 | fprintf(stderr, |
---|
| 1492 | "Error: loaded xmlsec library version is not compatible.\n"); |
---|
| 1493 | return(-1); |
---|
| 1494 | } |
---|
| 1495 | |
---|
| 1496 | /* Load default crypto engine if we are supporting dynamic |
---|
| 1497 | * loading for xmlsec-crypto libraries. Use the crypto library |
---|
| 1498 | * name ("openssl", "nss", etc.) to load corresponding |
---|
| 1499 | * xmlsec-crypto library. |
---|
| 1500 | */ |
---|
| 1501 | #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING |
---|
| 1502 | if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) { |
---|
| 1503 | fprintf(stderr, "Error: unable to load default xmlsec-crypto library. " |
---|
| 1504 | "Make sure\n" |
---|
| 1505 | "that you have it installed and check shared libraries path\n" |
---|
| 1506 | "(LD_LIBRARY_PATH) envornment variable.\n"); |
---|
| 1507 | return(-1); |
---|
| 1508 | } |
---|
| 1509 | #endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */ |
---|
| 1510 | |
---|
| 1511 | /* Init crypto library */ |
---|
| 1512 | if(xmlSecCryptoAppInit(NULL) < 0) { |
---|
| 1513 | fprintf(stderr, "Error: crypto initialization failed.\n"); |
---|
| 1514 | return(-1); |
---|
| 1515 | } |
---|
| 1516 | |
---|
| 1517 | /* Init xmlsec-crypto library */ |
---|
| 1518 | if(xmlSecCryptoInit() < 0) { |
---|
| 1519 | fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n"); |
---|
| 1520 | return(-1); |
---|
| 1521 | } |
---|
[95b150a] | 1522 | /* Turn off the built in debugging */ |
---|
| 1523 | xmlThrDefSetGenericErrorFunc(NULL, _nullGenericErrorFunc); |
---|
| 1524 | xmlSetGenericErrorFunc(NULL, _nullGenericErrorFunc); |
---|
| 1525 | |
---|
[9e063cb] | 1526 | return 0; |
---|
| 1527 | } |
---|
| 1528 | |
---|
| 1529 | int deinit_xmlsec() { |
---|
| 1530 | /* no op for now */ |
---|
| 1531 | return 0; |
---|
| 1532 | } |
---|
| 1533 | |
---|
| 1534 | |
---|
| 1535 | /* parse the xml blob and extract keyid */ |
---|
[461541a] | 1536 | char *get_keyid_from_xml(char *xml) { |
---|
| 1537 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
| 1538 | xmlChar keyid[SHA_DIGEST_LENGTH]; /* Issuer key SHA1 */ |
---|
| 1539 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid as text */ |
---|
| 1540 | char *ret=NULL; |
---|
| 1541 | |
---|
| 1542 | /* Get the issuer keyid */ |
---|
| 1543 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
| 1544 | goto fail; |
---|
| 1545 | sha1_to_text(keyid, text_keyid); |
---|
| 1546 | ret=strdup((char *)text_keyid); |
---|
| 1547 | fail: |
---|
| 1548 | xmlFreeDoc(doc); |
---|
| 1549 | return ret; |
---|
| 1550 | } |
---|
| 1551 | |
---|
[9e063cb] | 1552 | /* parse xml and get the expected expiration time and returns |
---|
| 1553 | * (expiration time-current time) |
---|
| 1554 | */ |
---|
[461541a] | 1555 | long get_validity_from_xml(char *xml) { |
---|
| 1556 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
| 1557 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
| 1558 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
| 1559 | struct tm tv; /* Parsed expires field */ |
---|
| 1560 | time_t now; /* Now in seconds since the epoch */ |
---|
| 1561 | time_t exp; /* expires in seconds since the epoch */ |
---|
| 1562 | long dtime=0; |
---|
| 1563 | |
---|
| 1564 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
| 1565 | goto fail; |
---|
| 1566 | |
---|
| 1567 | if ( !(expires = xmlSecFindNode(node, (xmlChar *) GENI_expires, NULL))) |
---|
| 1568 | goto fail; |
---|
| 1569 | |
---|
| 1570 | xmlChar *etime=get_element_content(expires); |
---|
| 1571 | time(&now); |
---|
| 1572 | |
---|
| 1573 | strptime((char *) etime, "%FT%TZ", &tv); |
---|
| 1574 | exp = timegm(&tv); |
---|
| 1575 | dtime=difftime(exp, now); |
---|
| 1576 | |
---|
| 1577 | fail: |
---|
| 1578 | xmlFreeDoc(doc); |
---|
| 1579 | return dtime; |
---|
| 1580 | } |
---|
| 1581 | |
---|
[9e063cb] | 1582 | /* parse xml structure and extract the attribute rules */ |
---|
[d2b198c] | 1583 | char **get_rt0_from_xml(void *ctxt_id_certs,char *xml, abac_keyid_map_t *km) { |
---|
[461541a] | 1584 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
| 1585 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
| 1586 | xmlChar *text = NULL; /* Text of the type field */ |
---|
| 1587 | xmlChar **rv = NULL; /* return value from parse_* */ |
---|
| 1588 | |
---|
[4721618] | 1589 | if ( !check_signature(doc) ) |
---|
| 1590 | goto fail; |
---|
| 1591 | /* Parse out the type field */ |
---|
[461541a] | 1592 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
| 1593 | goto fail; |
---|
[4721618] | 1594 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_credential, NULL))) |
---|
| 1595 | goto fail; |
---|
| 1596 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_type, NULL))) |
---|
| 1597 | goto fail; |
---|
| 1598 | |
---|
| 1599 | if ( !(text = get_element_content(node)) ) |
---|
| 1600 | goto fail; |
---|
[461541a] | 1601 | |
---|
| 1602 | /* Demux on type */ |
---|
| 1603 | if ( !strcmp((char *) text, "privilege")) { |
---|
[d2b198c] | 1604 | rv = parse_privilege(doc, ctxt_id_certs, km); |
---|
[461541a] | 1605 | } else if ( !strcmp((char *) text, "abac")) { |
---|
[d2b198c] | 1606 | rv = parse_abac(doc, ctxt_id_certs, km); |
---|
[461541a] | 1607 | } else { |
---|
| 1608 | goto fail; |
---|
| 1609 | } |
---|
| 1610 | fail: |
---|
| 1611 | xmlFreeDoc(doc); |
---|
[9ac7fb4] | 1612 | return (char **)rv; |
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[461541a] | 1613 | } |
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[9e063cb] | 1614 | |
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| 1615 | |
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