1 | /* abac_xml.c, specifically for GENI */ |
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2 | |
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3 | /* in xml, rc in general is, 1 is good, 0 or -1 is bad */ |
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4 | |
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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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30 | #include "abac.h" |
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31 | #include "abac_util.h" |
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32 | |
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33 | extern int abac_verifier_load_id_chars(void *, char*); |
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34 | extern void* abac_get_sha_from_nake_pem(char *npem, char **sha1); |
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35 | extern void abac_split(char *string, char *delim, char **ret, int *num); |
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36 | static int debug=0; |
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37 | |
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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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55 | #define GENI_x509_certificate "X509Certificate" |
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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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59 | #define GENI_rt0 "rt0" |
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60 | #define GENI_version "version" |
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61 | |
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62 | /* maximum credential stringlen */ |
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63 | #define CREDLEN 1024 |
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64 | /* Maximum version len */ |
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65 | #define VERSIONLEN 256 |
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66 | |
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67 | /* XML template for a new RT0 credential. Fill in the RT0 to store (XML |
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68 | * escaped) and the expiration time (formated using strftime_format and |
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69 | * strftime). */ |
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70 | #define template_v10 "<signed-credential>\n"\ |
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71 | " <credential xml:id=\"ref0\">\n"\ |
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72 | " <type>abac</type>\n"\ |
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73 | " <version>1.0</version>\n"\ |
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74 | " <expires>%s</expires>\n"\ |
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75 | " <rt0>%s</rt0>\n"\ |
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76 | " </credential>\n"\ |
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77 | " <signatures>\n"\ |
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78 | " <Signature xmlns=\"http://www.w3.org/2000/09/xmldsig#\">\n"\ |
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79 | " <SignedInfo>\n"\ |
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80 | " <CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"/>\n"\ |
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81 | " <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\"/>\n"\ |
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82 | " <Reference URI=\"#ref0\">\n"\ |
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83 | " <Transforms>\n"\ |
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84 | " <Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"/>\n"\ |
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85 | " </Transforms>\n"\ |
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86 | " <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\"/>\n"\ |
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87 | " <DigestValue/>\n"\ |
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88 | " </Reference>\n"\ |
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89 | " </SignedInfo>\n"\ |
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90 | " <SignatureValue/>\n"\ |
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91 | " <KeyInfo>\n"\ |
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92 | " <KeyValue/>\n"\ |
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93 | " <X509Data>\n"\ |
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94 | " <X509Certificate/>\n"\ |
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95 | " <X509SubjectName/>\n"\ |
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96 | " <X509IssuerSerial/>\n"\ |
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97 | " </X509Data>\n"\ |
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98 | " </KeyInfo>\n"\ |
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99 | " </Signature>\n"\ |
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100 | " </signatures>\n"\ |
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101 | "</signed-credential>" |
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102 | |
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103 | /* XML template for a new RT0 credential. Fill in the RT0 to store (XML |
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104 | * escaped) and the expiration time (formated using strftime_format and |
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105 | * strftime). */ |
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106 | #define template_v11 "<signed-credential>\n"\ |
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107 | " <credential xml:id=\"ref0\">\n"\ |
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108 | " <type>abac</type>\n"\ |
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109 | " <serial/>\n"\ |
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110 | " <owner_gid/>\n"\ |
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111 | " <target_gid/>\n"\ |
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112 | " <uuid/>\n"\ |
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113 | " <expires>%s</expires>\n"\ |
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114 | " <rt0>\n"\ |
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115 | " <version>1.1</version>\n"\ |
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116 | " %s\n"\ |
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117 | " </rt0>\n"\ |
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118 | " </credential>\n"\ |
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119 | " <signatures>\n"\ |
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120 | " <Signature xmlns=\"http://www.w3.org/2000/09/xmldsig#\">\n"\ |
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121 | " <SignedInfo>\n"\ |
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122 | " <CanonicalizationMethod Algorithm=\"http://www.w3.org/2001/10/xml-exc-c14n#\"/>\n"\ |
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123 | " <SignatureMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#rsa-sha1\"/>\n"\ |
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124 | " <Reference URI=\"#ref0\">\n"\ |
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125 | " <Transforms>\n"\ |
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126 | " <Transform Algorithm=\"http://www.w3.org/2000/09/xmldsig#enveloped-signature\"/>\n"\ |
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127 | " </Transforms>\n"\ |
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128 | " <DigestMethod Algorithm=\"http://www.w3.org/2000/09/xmldsig#sha1\"/>\n"\ |
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129 | " <DigestValue/>\n"\ |
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130 | " </Reference>\n"\ |
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131 | " </SignedInfo>\n"\ |
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132 | " <SignatureValue/>\n"\ |
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133 | " <KeyInfo>\n"\ |
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134 | " <KeyValue/>\n"\ |
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135 | " <X509Data>\n"\ |
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136 | " <X509Certificate/>\n"\ |
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137 | " <X509SubjectName/>\n"\ |
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138 | " <X509IssuerSerial/>\n"\ |
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139 | " </X509Data>\n"\ |
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140 | " </KeyInfo>\n"\ |
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141 | " </Signature>\n"\ |
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142 | " </signatures>\n"\ |
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143 | "</signed-credential>" |
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144 | |
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145 | xmlChar *encode_rt0_xml_v10(abac_attribute_t *); |
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146 | xmlChar *encode_rt0_xml_v11(abac_attribute_t *); |
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147 | xmlChar **parse_rt0_xml_v10(xmlNodePtr); |
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148 | xmlChar **parse_rt0_xml_v11(xmlNodePtr); |
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149 | |
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150 | typedef struct { |
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151 | char *version; |
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152 | xmlChar *(*rt0_to_xml)(abac_attribute_t *); |
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153 | xmlChar **(*xml_to_rt0)(xmlNodePtr); |
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154 | char *out_template; |
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155 | } GENI_xml_processing_t; |
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156 | |
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157 | GENI_xml_processing_t xml_proc[] = { |
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158 | { "1.0", encode_rt0_xml_v10, parse_rt0_xml_v10, template_v10}, |
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159 | { "1.1", encode_rt0_xml_v11, parse_rt0_xml_v11, template_v11}, |
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160 | { NULL, NULL, NULL}, |
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161 | }; |
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162 | |
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163 | GENI_xml_processing_t *get_xml_processing(char *ver) { |
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164 | int i ; |
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165 | |
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166 | for (i = 0; xml_proc[i].version; i++) { |
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167 | if (!strcmp(xml_proc[i].version, ver)) |
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168 | return &xml_proc[i]; |
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169 | } |
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170 | return NULL; |
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171 | } |
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172 | |
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173 | |
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174 | /* Hex dump the contents of buf (length len) to stderr. For debugging */ |
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175 | static void dump_it(xmlChar *buf, int len) { |
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176 | int i; |
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177 | |
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178 | for (i=0; i < len; i++ ) |
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179 | fprintf(stderr, "%02x ", buf[i] & 0xff); |
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180 | fprintf(stderr, "\n"); |
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181 | } |
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182 | |
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183 | /* Convert a SHA1 hash to text for printing or use in strings. keyid is the |
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184 | * hash (SHA_DIGEST_LENGTH bytes long) and text is the output string (at least |
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185 | * 2 * SHA_DIGEST_LENGTH +1 bytes long). The caller is responsible for |
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186 | * allocating and deallocating each of them. */ |
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187 | static void sha1_to_text(xmlChar *keyid, xmlChar *text) { |
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188 | int i = 0; |
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189 | |
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190 | for (i=0; i < SHA_DIGEST_LENGTH; i++) |
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191 | snprintf((char *) text+2*i, 3, "%02x", keyid[i] & 0xff); |
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192 | } |
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193 | |
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194 | /* |
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195 | * Returns the content pointer of the XML_TEXT node that is the child of the |
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196 | * node passed in. Node must point to an XML_ELEMENT node. the return value |
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197 | * is still part of node's XML document, so treat it as read only. */ |
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198 | static xmlChar *get_element_content(xmlNodePtr node) { |
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199 | xmlNodePtr text = NULL; |
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200 | |
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201 | if ( node->type != XML_ELEMENT_NODE ) return NULL; |
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202 | if ( !( text = node->children) ) return NULL; |
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203 | if ( text->type != XML_TEXT_NODE ) return NULL; |
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204 | return text->content; |
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205 | } |
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206 | |
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207 | /*Find the XML element named field that is a at or below node in the XML |
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208 | * document and return a copy of the base64 decoded content of its content. |
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209 | * For example, find key day in a signature and return it base64decoded. buf |
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210 | * is allocated and its length is returned in len. Any values for buf and len |
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211 | * are ignored and overwritten. */ |
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212 | static int get_base64_field(xmlNodePtr node, xmlChar *field, |
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213 | xmlChar **buf, int *len) { |
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214 | xmlChar *txt = NULL; |
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215 | |
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216 | *buf = NULL; |
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217 | |
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218 | if ( !(node = xmlSecFindNode(node, field, xmlSecDSigNs))) |
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219 | goto fail; |
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220 | |
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221 | if ( !(txt = get_element_content(node))) |
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222 | goto fail; |
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223 | |
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224 | *len = strlen((char *) txt); |
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225 | if ( !(*buf = malloc(*len))) |
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226 | goto fail; |
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227 | |
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228 | if ( (*len = xmlSecBase64Decode(txt, *buf, *len)) < 0 ) |
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229 | goto fail; |
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230 | |
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231 | return 1; |
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232 | fail: |
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233 | if ( *buf) free(*buf); |
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234 | *len = 0; |
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235 | return 0; |
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236 | } |
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237 | /* Construct an ASN.1 header for a field of type h that is len bytes long. |
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238 | * Mosttly this creates the proper length encoding under ASN.1's length |
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239 | * encoding rules. buf will contain the new header (and the caller is |
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240 | * responsible for making sure it is at least 6 bytes long, though fewer are |
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241 | * usually used. The length of the constructed header is returned. This is |
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242 | * used in creating a key hash from key data.*/ |
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243 | static int make_asn1_header(char h, size_t len, xmlChar *buf) { |
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244 | if ( len > 0x00ffffff) { |
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245 | buf[0] = h; |
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246 | buf[1] = 0x84; |
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247 | buf[2] = (len >> 24) & 0xff; |
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248 | buf[3] = (len >> 16) & 0xff; |
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249 | buf[4] = (len >> 8) & 0xff; |
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250 | buf[5] = (len) & 0xff; |
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251 | return 6; |
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252 | } else if ( len > 0x0000ffff ) { |
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253 | buf[0] = h; |
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254 | buf[1] = 0x83; |
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255 | buf[2] = (len >> 16) & 0xff; |
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256 | buf[3] = (len >> 8) & 0xff; |
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257 | buf[4] = (len) & 0xff; |
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258 | return 5; |
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259 | } else if ( len > 0x000000ff ) { |
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260 | buf[0] = h; |
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261 | buf[1] = 0x82; |
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262 | buf[2] = (len >> 8) & 0xff; |
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263 | buf[3] = (len) & 0xff; |
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264 | return 4; |
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265 | } else if ( len > 0x80 ) { |
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266 | buf[0] = h; |
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267 | buf[1] = 0x81; |
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268 | buf[2] = (len) & 0xff; |
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269 | return 3; |
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270 | } else { |
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271 | buf[0] = h; |
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272 | buf[1] = (len) & 0xff; |
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273 | return 2; |
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274 | } |
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275 | } |
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276 | |
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277 | /* Find the RSA key parameters in the KeyInfo section of the XML document |
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278 | * pointed to by doc, construct the ASN.1 encoding of that key and SHA1 hash |
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279 | * it. This gives the standard keyid of that key. keyid will be the binary |
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280 | * encoding of that (the bits of the hash) sha1_to_text will turn it to text. |
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281 | * keyid must be at least SHA_DIGEST_LENGTH bytes long, and the caller is |
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282 | * responsible for it. This routine returns 1 on success and 0 on failure. */ |
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283 | static int get_keyid_from_keyinfo(xmlDocPtr doc, xmlChar *keyid) { |
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284 | xmlNodePtr root = NULL; /* XML document root */ |
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285 | xmlNodePtr node = NULL; /* Scratch XML node */ |
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286 | |
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287 | xmlChar b0[20]; /* Header for the sequence */ |
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288 | xmlChar b1[20]; /* Header for the modulus */ |
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289 | xmlChar b2[20]; /* Header for the exponent */ |
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290 | int l0 = 0; /* Header length for the sequence */ |
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291 | int l1 = 0; /* Header length for the modulus */ |
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292 | int l2 = 0; /* Header length for the exponent */ |
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293 | |
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294 | xmlChar *modBuf = NULL; /* Bytes of the modulus */ |
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295 | xmlChar *expBuf = NULL; /* Bytes of the exponent */ |
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296 | int modLen = 0; /* Length of the modulus */ |
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297 | int expLen = 0; /* Length of the exponent */ |
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298 | |
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299 | SHA_CTX sha; /* SHA1 hash context */ |
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300 | |
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301 | int rv = 0; /* return value */ |
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302 | |
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303 | if ( !SHA1_Init(&sha)) goto fail; |
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304 | |
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305 | if ( !doc || !(root = xmlDocGetRootElement(doc)) ) |
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306 | goto fail; |
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307 | |
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308 | /* Find the KeyInfo section to be the root of later searches */ |
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309 | if ( !(node = xmlSecFindNode(root, |
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310 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
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311 | goto fail; |
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312 | |
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313 | /* Get the binary for the modulus and exponent */ |
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314 | if ( !get_base64_field(node, (xmlChar *) "Modulus", &modBuf, &modLen)) |
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315 | goto fail; |
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316 | if ( !get_base64_field(node, (xmlChar *) "Exponent", &expBuf, &expLen)) |
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317 | goto fail; |
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318 | |
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319 | /* Construct the headers for modulus and exponent. Another weird fact |
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320 | * about ASN.1 is that all the integers are signed, so if either the |
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321 | * modulus or exponent has the high order bit of its first byte set, the |
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322 | * ASN.1 encoding has a 0 byte prepended. This code appends the 0 byte to |
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323 | * the header, which results in the same hash. */ |
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324 | if ( modBuf[0] & 0x80 ) { |
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325 | l1 = make_asn1_header(0x02, modLen +1, b1); |
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326 | b1[l1++] = '\0'; |
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327 | } else { |
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328 | l1 = make_asn1_header(0x02, modLen, b1); |
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329 | } |
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330 | |
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331 | if ( expBuf[0] & 0x80 ) { |
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332 | l2 = make_asn1_header(0x02, expLen +1, b2); |
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333 | b2[l2++] = '\0'; |
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334 | } else { |
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335 | l2 = make_asn1_header(0x02, expLen, b2); |
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336 | } |
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337 | |
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338 | /* Sequence header: have to do it after we know the lengths of the inner |
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339 | * headers. */ |
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340 | l0 = make_asn1_header(0x30, modLen + expLen + l1 + l2, b0); |
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341 | /* Hash it all up in parts */ |
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342 | SHA1_Update(&sha, b0, l0); |
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343 | SHA1_Update(&sha, b1, l1); |
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344 | SHA1_Update(&sha, modBuf, modLen); |
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345 | SHA1_Update(&sha, b2, l2); |
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346 | SHA1_Update(&sha, expBuf, expLen); |
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347 | SHA1_Final(keyid, &sha); |
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348 | rv = 1; |
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349 | fail: |
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350 | |
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351 | if (modBuf) free(modBuf); |
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352 | if (expBuf) free(expBuf); |
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353 | return rv; |
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354 | } |
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355 | |
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356 | /* Check the signature of either kind of credential - it'll work for basically |
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357 | * any signed XML. Returns true if the signature checks and false otherwise. |
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358 | * Takes a pointer to the XML document to check. Similar to the examples at |
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359 | * http://www.aleksey.com/xmlsec/api/xmlsec-examples.html */ |
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360 | static int check_signature(xmlDocPtr doc) { |
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361 | xmlNodePtr root = NULL; /* Root XML node */ |
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362 | xmlNodePtr node = NULL; /* Scratch XML node */ |
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363 | xmlSecKeyInfoCtxPtr keyCtx = NULL;/* Key info context. Used to parse |
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364 | KeyInfo */ |
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365 | xmlSecKeysMngrPtr keyMan = NULL;/* Key manager - used because we have |
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366 | certificated. */ |
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367 | xmlSecKeyPtr key = NULL; /* The key extracted */ |
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368 | xmlSecDSigCtxPtr dsigCtx = NULL;/* Signature context */ |
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369 | int rv = 0; /* Return value */ |
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370 | |
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371 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
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372 | goto fail; |
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373 | |
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374 | /* Find the KeyInfo section to pull the keys out. */ |
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375 | if ( !(node = xmlSecFindNode(root, |
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376 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
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377 | goto fail; |
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378 | |
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379 | /* Create and initialize key, key manager, and context */ |
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380 | if ( !(key = xmlSecKeyCreate() ) ) |
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381 | goto fail; |
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382 | if ( !(keyMan = xmlSecKeysMngrCreate()) ) |
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383 | goto fail; |
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384 | |
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385 | if ( xmlSecCryptoAppDefaultKeysMngrInit(keyMan) < 0) |
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386 | goto fail; |
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387 | |
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388 | if ( !(keyCtx = xmlSecKeyInfoCtxCreate(keyMan)) ) |
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389 | goto fail; |
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390 | |
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391 | /* Do not check certificate signatures */ |
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392 | keyCtx->flags |= XMLSEC_KEYINFO_FLAGS_X509DATA_DONT_VERIFY_CERTS; |
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393 | |
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394 | /* Gather up the key data */ |
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395 | if ( xmlSecKeyInfoNodeRead(node, key, keyCtx) < 0 ) |
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396 | goto fail; |
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397 | |
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398 | /* Set up the signature context and attack the keys */ |
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399 | if ( !(dsigCtx = xmlSecDSigCtxCreate(NULL))) |
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400 | goto fail; |
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401 | |
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402 | dsigCtx->signKey = key; |
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403 | |
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404 | /* find the Signature section */ |
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405 | if ( !(node = xmlSecFindNode(root, |
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406 | xmlSecNodeSignature, xmlSecDSigNs))) |
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407 | goto fail; |
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408 | |
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409 | /* Check it */ |
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410 | if ( (rv = xmlSecDSigCtxVerify(dsigCtx, node)) < 0 ) |
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411 | goto fail; |
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412 | |
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413 | /* Strangely xmlSecDSigCtxVerify can return success even if the status is |
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414 | * bad. Check the status in the context explicitly and override the result |
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415 | * above if necessary.*/ |
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416 | if ( dsigCtx->status != xmlSecDSigStatusSucceeded) |
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417 | goto fail; |
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418 | |
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419 | return 1; |
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420 | fail: |
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421 | if ( key ) xmlSecKeyDestroy(key); |
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422 | if ( keyCtx ) xmlSecKeyInfoCtxDestroy(keyCtx); |
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423 | if ( dsigCtx) xmlSecDSigCtxDestroy(dsigCtx); |
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424 | return 0; |
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425 | } |
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426 | |
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427 | /* Extract a sha from PEM blob */ |
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428 | static void extract_owner_sha1(xmlChar *pem, xmlChar **sha1) { |
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429 | abac_get_sha_from_nake_pem((char *) pem, (char **)sha1); |
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430 | if(debug) fprintf(stderr,"owner sha1 is (%s)..\n", *sha1); |
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431 | } |
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432 | static void extract_target_sha1(xmlChar *pem, xmlChar **sha1) { |
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433 | abac_get_sha_from_nake_pem((char *) pem,(char **)sha1); |
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434 | if(debug) fprintf(stderr,"group sha1 is (%s)..\n", *sha1); |
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435 | } |
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436 | |
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437 | /* Parse the content of the expires field and compare it to the time passed in |
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438 | * n. If expires is earlier, return false, else true. If n is null, compare |
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439 | * it to the current time. */ |
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440 | static int check_GENI_expires(xmlChar *expires, struct tm *n) { |
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441 | struct tm tv; /* Parsed expires field */ |
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442 | time_t now; /* Now in seconds since the epoch */ |
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443 | time_t exp; /* expires in seconds since the epoch */ |
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444 | |
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445 | if (n) now = mktime(n); |
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446 | else time(&now); |
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447 | |
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448 | strptime((char *) expires, "%FT%TZ", &tv); |
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449 | exp = timegm(&tv); |
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450 | |
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451 | return difftime(exp, now) > 0.0; |
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452 | } |
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453 | |
---|
454 | /* Convert a parsed privilege in a GENI privilege string into one or more ABAC |
---|
455 | * creds. Rules are as in http://groups.geni.net/geni/wiki/TIEDCredentials . |
---|
456 | * keyid is the issuer's keyid, text_owner is the owners keyid (XXX:a |
---|
457 | * placeholder) text_target is the target's keyid (XXX: a placeholder), priv is |
---|
458 | * the privilege being assigned, and delegate is true if it can be delegated. |
---|
459 | * carray is the output array of character strings that currently has *nc |
---|
460 | * entries in it. If nc has nothing in it, insert the "speaks_for" delegation |
---|
461 | * rules. Then add the privilege specific rules. On failure ***carray and its |
---|
462 | * contents are freed and *nc is set to zero.*/ |
---|
463 | static void add_privilege_credential_string(xmlChar *text_keyid, xmlChar *text_owner, |
---|
464 | xmlChar *text_target, xmlChar *priv, int delegate, xmlChar ***carray, |
---|
465 | int *nc) { |
---|
466 | xmlChar **rv = *carray; /* Local pointer to the array of strings */ |
---|
467 | xmlChar **newrv = NULL; /* Used to realloc the array of strings */ |
---|
468 | int ncred = *nc; /* Local copy of the number of creds in rv */ |
---|
469 | int newc = (delegate) ? 3 : 1; /* Number of new creds to add */ |
---|
470 | int base = ncred; /* First new credential index. This advances |
---|
471 | as we add creds to rv. */ |
---|
472 | int i = 0; /* Scratch */ |
---|
473 | |
---|
474 | /* If rv is empty, add the speaks_for rules */ |
---|
475 | if (base == 0 ) newc += 2; |
---|
476 | |
---|
477 | /* Resize rv */ |
---|
478 | if (!(newrv = realloc(rv, (base + newc) * sizeof(xmlChar *)))) |
---|
479 | goto fail; |
---|
480 | |
---|
481 | for ( i = base; i < base +newc; i ++) { |
---|
482 | newrv[i] = NULL; |
---|
483 | } |
---|
484 | |
---|
485 | /* So fail works */ |
---|
486 | rv = newrv; |
---|
487 | ncred = base + newc; |
---|
488 | |
---|
489 | /* Add speaks_for rules if needed */ |
---|
490 | if ( base == 0 ) { |
---|
491 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
492 | snprintf((char *) rv[base], CREDLEN, |
---|
493 | "%s.speaks_for_%s <- %s.speaks_for_%s", |
---|
494 | text_keyid, text_owner, text_owner, text_owner); |
---|
495 | base++; |
---|
496 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
497 | snprintf((char *) rv[base], CREDLEN, |
---|
498 | "%s.speaks_for_%s <- %s", |
---|
499 | text_keyid, text_owner, text_owner); |
---|
500 | base++; |
---|
501 | } |
---|
502 | |
---|
503 | /* The assignemnt of priv. Always happens */ |
---|
504 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
505 | snprintf((char *) rv[base], CREDLEN, |
---|
506 | "%s.%s_%s <- %s.speaks_for_%s", |
---|
507 | text_keyid, priv, text_target, text_keyid, text_owner); |
---|
508 | base++; |
---|
509 | /* Add delegation rules */ |
---|
510 | if ( delegate ) { |
---|
511 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
512 | snprintf((char *) rv[base], CREDLEN, |
---|
513 | "%s.%s_%s <- %s.can_delegate_%s_%s.%s_%s", |
---|
514 | text_keyid, priv, text_target, text_keyid, priv, |
---|
515 | text_target, priv, text_target); |
---|
516 | base++; |
---|
517 | if ( !(rv[base] = malloc(CREDLEN))) goto fail; |
---|
518 | snprintf((char *) rv[base], CREDLEN, |
---|
519 | "%s.can_delegate_%s_%s <- %s", |
---|
520 | text_keyid, priv, text_target, text_owner); |
---|
521 | base++; |
---|
522 | } |
---|
523 | /* And return new values */ |
---|
524 | *carray = rv; |
---|
525 | *nc = ncred; |
---|
526 | return; |
---|
527 | fail: |
---|
528 | if ( rv ) { |
---|
529 | /* Delete all the allocations, ours or not, and clear the caller's |
---|
530 | * variables */ |
---|
531 | for (i = 0; i < ncred; i++) |
---|
532 | if (rv[i]) free(rv[i]); |
---|
533 | free(rv); |
---|
534 | } |
---|
535 | *carray = NULL; |
---|
536 | *nc = 0; |
---|
537 | } |
---|
538 | |
---|
539 | |
---|
540 | /* Grab the issuer x509 blob */ |
---|
541 | static xmlChar *get_issuer(xmlDocPtr doc) { |
---|
542 | xmlNodePtr root = NULL; /* Root XML node */ |
---|
543 | xmlNodePtr node = NULL; /* Scratch XML node */ |
---|
544 | xmlNodePtr x509ptr = NULL; /* XML X509Certificate node */ |
---|
545 | int rv = 0; /* Return value */ |
---|
546 | xmlChar *pem=NULL; |
---|
547 | |
---|
548 | if (!(root = xmlDocGetRootElement(doc)) ) |
---|
549 | goto fail; |
---|
550 | |
---|
551 | /* Find the KeyInfo section to be the root of later searches */ |
---|
552 | if ( !(node = xmlSecFindNode(root, |
---|
553 | xmlSecNodeKeyInfo, xmlSecDSigNs))) |
---|
554 | goto fail; |
---|
555 | |
---|
556 | if ( !(node = xmlSecFindNode(node, |
---|
557 | xmlSecNodeX509Data, xmlSecDSigNs))) |
---|
558 | goto fail; |
---|
559 | |
---|
560 | /* Find the X509Certificate from KeyInfo section */ |
---|
561 | if ( x509ptr = xmlSecFindNode(node, xmlSecNodeX509Certificate, xmlSecDSigNs)) { |
---|
562 | pem=get_element_content(x509ptr); |
---|
563 | } else { |
---|
564 | goto fail; |
---|
565 | } |
---|
566 | return pem; |
---|
567 | fail: |
---|
568 | return NULL; |
---|
569 | } |
---|
570 | |
---|
571 | /* Parse a GENI privilege credential (that has already had its signature |
---|
572 | * checked) and return the RT0 strings that the credential is encoded as. The |
---|
573 | * return value is an array of strings, zero-terminated (like argv) that holds |
---|
574 | * the RT0 strings. It is NULL on failure. */ |
---|
575 | static xmlChar **parse_privilege(xmlDocPtr doc, void *ctxt_id_certs) { |
---|
576 | xmlNodePtr root = NULL; /* XML root node */ |
---|
577 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
578 | xmlNodePtr owner = NULL; /* XML owner_gid node */ |
---|
579 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
580 | xmlNodePtr target = NULL; /* XML target_gid node */ |
---|
581 | xmlNodePtr privs = NULL; /* XML privileges node */ |
---|
582 | xmlNodePtr priv = NULL; /* XML privilege node - used to iterate */ |
---|
583 | xmlChar keyid[SHA_DIGEST_LENGTH]; /* Issuer key SHA1 */ |
---|
584 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid as text */ |
---|
585 | xmlChar *owner_sha1 = NULL; /* owner gid as text */ |
---|
586 | xmlChar *target_sha1 = NULL; /* target gid as text */ |
---|
587 | xmlChar **newrv = NULL; /* Used to realloc rv to add the NULL |
---|
588 | terminator*/ |
---|
589 | xmlChar **rv = NULL; /* return value */ |
---|
590 | int ncred = 0; /* number of creds in rv, incase we need to |
---|
591 | deallocate it */ |
---|
592 | int i = 0; /* scratch */ |
---|
593 | |
---|
594 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
---|
595 | goto fail; |
---|
596 | |
---|
597 | /* Get the issuer keyid */ |
---|
598 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
599 | goto fail; |
---|
600 | sha1_to_text(keyid, text_keyid); |
---|
601 | |
---|
602 | /* Find the various fields of interest */ |
---|
603 | if ( !(node = xmlSecFindNode(root, (xmlChar *) GENI_credential, NULL))) |
---|
604 | goto fail; |
---|
605 | |
---|
606 | /* Make sure this is not expired */ |
---|
607 | if ( !(expires = xmlSecFindNode(node, (xmlChar *) GENI_expires, NULL))) |
---|
608 | goto fail; |
---|
609 | |
---|
610 | if ( !check_GENI_expires(get_element_content(expires), NULL)) |
---|
611 | goto fail; |
---|
612 | |
---|
613 | /* owner and target will be X.509 pem files from which we need to |
---|
614 | * extract keyids for add_privilege_credential_string. */ |
---|
615 | if ( !(owner = xmlSecFindNode(node, (xmlChar *) GENI_owner_gid, NULL))) |
---|
616 | goto fail; |
---|
617 | extract_owner_sha1(get_element_content(owner),&owner_sha1); |
---|
618 | |
---|
619 | if ( !(target = xmlSecFindNode(node, (xmlChar *) GENI_target_gid, NULL))) |
---|
620 | goto fail; |
---|
621 | extract_target_sha1(get_element_content(target),&target_sha1); |
---|
622 | |
---|
623 | /* extract issuer pem */ |
---|
624 | xmlChar *issuer_ptr=get_issuer(doc); |
---|
625 | |
---|
626 | if ( !(privs = xmlSecFindNode(node, (xmlChar *) GENI_privileges, NULL))) |
---|
627 | goto fail; |
---|
628 | |
---|
629 | /* Iterate through the privileges, parsing out names and can_delegate and |
---|
630 | * generating the strings from it. */ |
---|
631 | for (priv = privs->children; priv; priv = priv->next) { |
---|
632 | /* reinitialized every time around */ |
---|
633 | xmlNodePtr n = NULL; |
---|
634 | xmlChar *name = NULL; |
---|
635 | int delegate = -1; |
---|
636 | |
---|
637 | /* Ignore wayward text and other gook */ |
---|
638 | if ( priv->type != XML_ELEMENT_NODE) |
---|
639 | continue; |
---|
640 | |
---|
641 | /* Ignore things that are not privilege nodes */ |
---|
642 | if ( strcmp((char *) priv->name, (char *) GENI_privilege) ) |
---|
643 | continue; |
---|
644 | |
---|
645 | /* looking for name and can_delegate */ |
---|
646 | for (n = priv->children; n; n = n->next) { |
---|
647 | if ( n->type != XML_ELEMENT_NODE ) |
---|
648 | continue; |
---|
649 | if ( !strcmp((char *) n->name, (char *) GENI_name)) { |
---|
650 | name = get_element_content(n); |
---|
651 | continue; |
---|
652 | } |
---|
653 | if ( !strcmp((char *) n->name, (char *) GENI_can_delegate)) { |
---|
654 | xmlChar *boolean = get_element_content(n); |
---|
655 | |
---|
656 | if ( !strcmp((char *) boolean, "true") || |
---|
657 | !strcmp((char *) boolean, "1") ) { |
---|
658 | delegate = 1; |
---|
659 | } else if ( !strcmp((char *) boolean, "false") || |
---|
660 | !strcmp((char *) boolean, "0") ) { |
---|
661 | delegate = 0; |
---|
662 | } else { |
---|
663 | fprintf(stderr, "Unknown delegation value %s", boolean); |
---|
664 | } |
---|
665 | } |
---|
666 | } |
---|
667 | /* Found both name and can_delegate, add the RT0 to rv and ncred */ |
---|
668 | if ( name && delegate != -1 ) { |
---|
669 | add_privilege_credential_string(text_keyid, |
---|
670 | (xmlChar *) owner_sha1, (xmlChar *) target_sha1, name, |
---|
671 | delegate, &rv, &ncred); |
---|
672 | if ( !rv ) goto fail; |
---|
673 | } |
---|
674 | } |
---|
675 | |
---|
676 | /* Add the terminating NULL */ |
---|
677 | if (!(newrv = realloc(rv, sizeof(xmlChar*)*(ncred+1)))) |
---|
678 | goto fail; |
---|
679 | |
---|
680 | newrv[ncred] = NULL; |
---|
681 | /* able to extract some RT0s, load issuer credential as side-effect */ |
---|
682 | if(ncred !=1) { |
---|
683 | /* load issuer_ptr */ |
---|
684 | if(issuer_ptr && abac_verifier_load_id_chars(ctxt_id_certs, issuer_ptr) != 0 /*ABAC_CERT_SUCCESS*/) |
---|
685 | goto fail; |
---|
686 | } |
---|
687 | return newrv; |
---|
688 | |
---|
689 | fail: |
---|
690 | /* Throw away all of rv if there's an error */ |
---|
691 | if ( rv ) { |
---|
692 | for (i = 0; i < ncred; i++) |
---|
693 | if (rv[i]) free(rv[i]); |
---|
694 | free(rv); |
---|
695 | } |
---|
696 | return NULL; |
---|
697 | } |
---|
698 | |
---|
699 | /* Compare the version string (major.minor) to the major and minor numbers, and |
---|
700 | * return true if the version string is >= the major minor pair. */ |
---|
701 | static int check_GENI_abac_version(xmlChar *version, int major, int minor) { |
---|
702 | xmlChar lversion[VERSIONLEN]; /* Buffer to parse version in */ |
---|
703 | xmlChar *lp = &lversion[0]; /* strsep needs a pointer it can modify */ |
---|
704 | int maj = 0; /* Parsed major number */ |
---|
705 | int min = 0; /* Parsed minor number */ |
---|
706 | char *values[2]; |
---|
707 | int ret=2; |
---|
708 | |
---|
709 | snprintf((char *) lp, VERSIONLEN, "%s", (char *) version); |
---|
710 | abac_split(lp, ".", values, &ret); |
---|
711 | if(ret==2) { |
---|
712 | /* split successful, values[0] is the major number, |
---|
713 | values[1] is the minor, now we parse integers*/ |
---|
714 | if ( *values[0] == '\0') return 0; |
---|
715 | maj = strtol(values[0], NULL, 10); |
---|
716 | if ( *values[1] == '\0') return 0; |
---|
717 | min = strtol(values[1], NULL, 10); |
---|
718 | } else return 0; |
---|
719 | |
---|
720 | if (maj > major || |
---|
721 | (maj == major && min > minor) || |
---|
722 | (maj == major && min == minor) ) return 1; |
---|
723 | else return 0; |
---|
724 | } |
---|
725 | |
---|
726 | /* |
---|
727 | * If n has a child that is an element named name, return a pointer to it, |
---|
728 | * other wise return NULL. |
---|
729 | */ |
---|
730 | static xmlNodePtr get_direct_child(xmlNodePtr n, xmlChar *name) { |
---|
731 | xmlNodePtr c = NULL; |
---|
732 | |
---|
733 | if ( !n ) return NULL; |
---|
734 | |
---|
735 | for (c = n->children; c; c = c->next) { |
---|
736 | if ( c->type != XML_ELEMENT_NODE ) |
---|
737 | continue; |
---|
738 | if ( !strcmp((char *) c->name, (char *) name)) |
---|
739 | return c; |
---|
740 | } |
---|
741 | return NULL; |
---|
742 | } |
---|
743 | |
---|
744 | xmlChar **parse_rt0_xml_v10(xmlNodePtr n) { |
---|
745 | xmlChar *txt; |
---|
746 | xmlChar **rv = NULL; |
---|
747 | |
---|
748 | /* read the RT0 and return it */ |
---|
749 | if ( !(txt = get_element_content(n)) ) return NULL; |
---|
750 | |
---|
751 | if ( !(rv = malloc(2 * sizeof(xmlChar *)))) return NULL; |
---|
752 | if (!(rv[0] = malloc(strlen((char *) txt)+1))) { |
---|
753 | free(rv); |
---|
754 | return NULL; |
---|
755 | } |
---|
756 | strcpy((char *) rv[0], (char *) txt); |
---|
757 | rv[1] = NULL; |
---|
758 | return rv; |
---|
759 | } |
---|
760 | |
---|
761 | static int role_len(xmlChar *rn) { |
---|
762 | xmlChar *p; |
---|
763 | int len = 0; |
---|
764 | |
---|
765 | for (p = rn; *p; p++) |
---|
766 | if ( !isspace(*p) ) len++; |
---|
767 | return len; |
---|
768 | } |
---|
769 | |
---|
770 | static int term_len(xmlNodePtr n) { |
---|
771 | int len = 0; |
---|
772 | xmlNodePtr c = NULL;/* Scratch */ |
---|
773 | |
---|
774 | for (c = n->children; c; c = c->next) { |
---|
775 | if ( c->type != XML_ELEMENT_NODE ) |
---|
776 | continue; |
---|
777 | if ( !strcmp((char *) c->name, "ABACprincipal")) { |
---|
778 | xmlNodePtr k = get_direct_child(c, "keyid"); |
---|
779 | if ( !k ) return -1; |
---|
780 | len += role_len(get_element_content(k)); |
---|
781 | } else if (!strcmp((char *) c->name, "role")) { |
---|
782 | len += role_len(get_element_content(c)) +1; |
---|
783 | } else if (!strcmp((char *) c->name, "linking_role")) { |
---|
784 | len += role_len(get_element_content(c)) +1; |
---|
785 | } |
---|
786 | } |
---|
787 | return len; |
---|
788 | } |
---|
789 | |
---|
790 | |
---|
791 | static xmlChar *role_copy(xmlChar *rn, xmlChar *dest) { |
---|
792 | while (*rn) { |
---|
793 | if (!isspace(*rn)) *dest++ = *rn; |
---|
794 | rn++; |
---|
795 | } |
---|
796 | return dest; |
---|
797 | } |
---|
798 | |
---|
799 | static xmlChar *term_copy(xmlNodePtr n, xmlChar *dest) { |
---|
800 | xmlNodePtr p = get_direct_child(n, "ABACprincipal"); |
---|
801 | |
---|
802 | if ( !p ) return NULL; |
---|
803 | if ( !(p = get_direct_child(p, "keyid"))) return NULL; |
---|
804 | if ( !(dest = role_copy(get_element_content(p), dest))) return NULL; |
---|
805 | if ( (p = get_direct_child(n, "linking_role"))) { |
---|
806 | *dest++ = '.'; |
---|
807 | if ( !(dest = role_copy(get_element_content(p), dest))) return NULL; |
---|
808 | } |
---|
809 | if ( (p = get_direct_child(n, "role"))) { |
---|
810 | *dest++ = '.'; |
---|
811 | if ( !(dest = role_copy(get_element_content(p), dest))) return NULL; |
---|
812 | } |
---|
813 | return dest; |
---|
814 | } |
---|
815 | |
---|
816 | static xmlChar *append_and_move(xmlChar *d, xmlChar *a, int sz) { |
---|
817 | strncat((char *) d, (char *) a, sz); |
---|
818 | return d + sz; |
---|
819 | } |
---|
820 | |
---|
821 | xmlChar **parse_rt0_xml_v11(xmlNodePtr n) { |
---|
822 | int len = 3; /* Length of the RT0 string we're building initially 3 for |
---|
823 | the <- and end-of-string */ |
---|
824 | int heads = 0; /* number of tails so far */ |
---|
825 | int tails = 0; /* number of tails so far */ |
---|
826 | xmlNodePtr c = NULL;/* Scratch */ |
---|
827 | xmlChar **rv = NULL; |
---|
828 | xmlChar *d = NULL; |
---|
829 | |
---|
830 | if ( !n ) return NULL; |
---|
831 | |
---|
832 | for (c = n->children; c; c = c->next) { |
---|
833 | if ( c->type != XML_ELEMENT_NODE ) |
---|
834 | continue; |
---|
835 | if ( !strcmp((char *) c->name, "head") ) { |
---|
836 | len += term_len(c); |
---|
837 | heads ++; |
---|
838 | } else if (!strcmp((char *) c->name, "tail")) { |
---|
839 | len += term_len(c); |
---|
840 | /* if more than one tail, add space for " & " */ |
---|
841 | if ( tails++) len += 3; |
---|
842 | } |
---|
843 | } |
---|
844 | if ( heads != 1 || tails < 1) return NULL; |
---|
845 | if ( !(rv = malloc(2 * sizeof(xmlChar *)))) return NULL; |
---|
846 | if (!(rv[0] = malloc(len)) ) { |
---|
847 | free(rv); |
---|
848 | return NULL; |
---|
849 | } |
---|
850 | d = rv[0]; |
---|
851 | if ( !( c = get_direct_child(n, "head"))) goto fail; |
---|
852 | if ( !(d = term_copy(c, d))) goto fail; |
---|
853 | d = append_and_move(d, "<-", 2); |
---|
854 | tails = 0; |
---|
855 | for (c = n->children; c; c = c->next) { |
---|
856 | if ( c->type != XML_ELEMENT_NODE ) |
---|
857 | continue; |
---|
858 | if ( !strcmp((char *) c->name, "tail") ) { |
---|
859 | /* if more than one tail, add " & " */ |
---|
860 | if ( tails++) |
---|
861 | d = append_and_move(d, " & ", 3); |
---|
862 | if ( !(d = term_copy(c, d))) goto fail; |
---|
863 | } |
---|
864 | } |
---|
865 | return rv; |
---|
866 | |
---|
867 | fail: |
---|
868 | free(rv[0]); |
---|
869 | free(rv); |
---|
870 | return NULL; |
---|
871 | } |
---|
872 | /* |
---|
873 | * Parse an ABAC credential (that has had its signature checked. Make sure it |
---|
874 | * has not expired and that its version is at least 1.0 (XXX: parameterize |
---|
875 | * that), and return the RT0 it encodes as the only entry in an NULL-terminated |
---|
876 | * array of strings (just like parse_privilege). On failure return NULL. */ |
---|
877 | xmlChar **parse_abac(xmlDocPtr doc, void *ctxt_id_certs) { |
---|
878 | xmlNodePtr root = NULL; /* XML root node */ |
---|
879 | xmlNodePtr node = NULL; /* XML credential node */ |
---|
880 | xmlNodePtr rt0 = NULL; /* XML rt0 node */ |
---|
881 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
882 | xmlNodePtr version = NULL; /* XML version node */ |
---|
883 | xmlChar keyid[SHA_DIGEST_LENGTH];/* issuer SHA1 hash */ |
---|
884 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid in text */ |
---|
885 | xmlChar *txt; /* rt0 content */ |
---|
886 | xmlChar **rv = NULL; /* return value */ |
---|
887 | GENI_xml_processing_t *proc = NULL; /* Specialization for version number */ |
---|
888 | int ncred = 0; /* number of creds in rv */ |
---|
889 | int i = 0; /* Scratch (used only in fail:) */ |
---|
890 | |
---|
891 | if ( doc && !(root = xmlDocGetRootElement(doc)) ) |
---|
892 | goto fail; |
---|
893 | |
---|
894 | /* Get the issuer keyid */ |
---|
895 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
896 | goto fail; |
---|
897 | sha1_to_text(keyid, text_keyid); |
---|
898 | /* get the various nodes of interest */ |
---|
899 | if ( !(node = xmlSecFindNode(root, (xmlChar *) GENI_credential, NULL))) |
---|
900 | goto fail; |
---|
901 | if ( !(expires = get_direct_child(node, (xmlChar *) GENI_expires))) |
---|
902 | goto fail; |
---|
903 | if ( !check_GENI_expires(get_element_content(expires), NULL)) |
---|
904 | goto fail; |
---|
905 | |
---|
906 | if ( !(rt0 = get_direct_child(node, (xmlChar *) GENI_rt0))) |
---|
907 | goto fail; |
---|
908 | /* There are two places to look for a version. The credential node and the |
---|
909 | * rt0 node that is a child of the credential node. The version element is |
---|
910 | * only under the credential in the misdefined GENI abac v1.0. */ |
---|
911 | if ( !(version = get_direct_child(node, (xmlChar *) GENI_version))) { |
---|
912 | if ( !(version = get_direct_child(rt0, (xmlChar *) GENI_version))) |
---|
913 | goto fail; |
---|
914 | } |
---|
915 | |
---|
916 | /* Pick parsing specialization based on the version. If we can't resolve a |
---|
917 | * processor, this is an unknown version. */ |
---|
918 | if ( !(proc = get_xml_processing(get_element_content(version)))) |
---|
919 | goto fail; |
---|
920 | |
---|
921 | /* read the RT0 and return it */ |
---|
922 | if ( !(rv = proc->xml_to_rt0(rt0)) ) goto fail; |
---|
923 | ncred=1; |
---|
924 | |
---|
925 | /* extract issuer pem and insert */ |
---|
926 | xmlChar *issuer_ptr=get_issuer(doc); |
---|
927 | if(issuer_ptr && abac_verifier_load_id_chars(ctxt_id_certs,issuer_ptr) != 0 /*ABAC_CERT_SUCCESS*/) { |
---|
928 | goto fail; |
---|
929 | } |
---|
930 | |
---|
931 | return rv; |
---|
932 | fail: |
---|
933 | if ( rv ) { |
---|
934 | for (i = 0; i < ncred; i++) |
---|
935 | if (rv[i]) free(rv[i]); |
---|
936 | free(rv); |
---|
937 | } |
---|
938 | return NULL; |
---|
939 | } |
---|
940 | |
---|
941 | /* Check and parse a GENI credential. Return the new RT0 rules in a |
---|
942 | * NULL-terminated array of strings. If the signature or parsing fails, return |
---|
943 | * NULL. Demultiplexed to parse_privilege or parse_abac to do the parsing and |
---|
944 | * uses check_signature to confirm the sig. */ |
---|
945 | char **read_credential(void *ctxt_id_certs, char *infile, |
---|
946 | char **in_xml) { |
---|
947 | xmlChar **xml = in_xml; /* Cast */ |
---|
948 | xmlDocPtr doc = xmlParseFile(infile); /* Parse the document */ |
---|
949 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
950 | xmlChar *text = NULL; /* Text of the type field */ |
---|
951 | xmlChar **rv = NULL; /* return value from parse_* */ |
---|
952 | |
---|
953 | if ( !check_signature(doc) ) |
---|
954 | goto fail; |
---|
955 | /* Parse out the type field */ |
---|
956 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
957 | goto fail; |
---|
958 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_credential, NULL))) |
---|
959 | goto fail; |
---|
960 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_type, NULL))) |
---|
961 | goto fail; |
---|
962 | |
---|
963 | if ( !(text = get_element_content(node)) ) |
---|
964 | goto fail; |
---|
965 | |
---|
966 | /* Demux on type */ |
---|
967 | if ( !strcmp((char *) text, "privilege")) { |
---|
968 | rv = parse_privilege(doc, ctxt_id_certs); |
---|
969 | } else if ( !strcmp((char *) text, "abac")) { |
---|
970 | rv = parse_abac(doc, ctxt_id_certs); |
---|
971 | } else { |
---|
972 | goto fail; |
---|
973 | } |
---|
974 | int len=0; |
---|
975 | xmlDocDumpMemoryEnc(doc, xml, &len, "UTF-8"); |
---|
976 | if(len == 0) |
---|
977 | goto fail; |
---|
978 | |
---|
979 | fail: |
---|
980 | xmlFreeDoc(doc); |
---|
981 | return (char **) rv; |
---|
982 | } |
---|
983 | |
---|
984 | |
---|
985 | /* from Ted's writer */ |
---|
986 | |
---|
987 | /* maximum rt0 stringlen */ |
---|
988 | #define CREDLEN 1024 |
---|
989 | /* Maximum version len */ |
---|
990 | #define VERSIONLEN 256 |
---|
991 | |
---|
992 | char *strftime_fmt = "%FT%TZ"; |
---|
993 | #define EXPIRESLEN 20 |
---|
994 | |
---|
995 | /* Return a copy of str with > < and & replaced by > < and & for |
---|
996 | * embedding in XML. Caller is responsible for deallocating the return value |
---|
997 | * using xmlFree(). |
---|
998 | */ |
---|
999 | static xmlChar *minimal_xml_escaping(xmlChar *str) { |
---|
1000 | /* A quickie translation table with the character to escape, the output |
---|
1001 | * string and the length of the output in it. The table is initialized with |
---|
1002 | * the three translations we want. */ |
---|
1003 | static struct esc { |
---|
1004 | xmlChar c; |
---|
1005 | xmlChar *esc; |
---|
1006 | int l; |
---|
1007 | } escapes[] = { |
---|
1008 | { (xmlChar) '<', (xmlChar *) "<", 4 }, |
---|
1009 | { (xmlChar) '>', (xmlChar *) ">", 4}, |
---|
1010 | { (xmlChar) '&', (xmlChar *) "&", 5}, |
---|
1011 | { (xmlChar) '\0', NULL, 0 }, |
---|
1012 | }; |
---|
1013 | |
---|
1014 | xmlChar *rv = NULL; /* Return value */ |
---|
1015 | xmlChar *p = NULL; /* Scratch (walking str) */ |
---|
1016 | xmlChar *q = NULL; /* Scratch (walking rv) */ |
---|
1017 | struct esc *e = NULL; /* Scratch for walking escapes */ |
---|
1018 | int len = 0; /* Length of rv */ |
---|
1019 | |
---|
1020 | /* Walk str and calculate how long the escaped version is */ |
---|
1021 | for ( p = str; *p ; p++) { |
---|
1022 | int foundit = 0; |
---|
1023 | for ( e = escapes; !foundit && e->c ; e++ ) { |
---|
1024 | if ( *p == e->c ) { |
---|
1025 | len += e->l; |
---|
1026 | foundit = 1; |
---|
1027 | } |
---|
1028 | } |
---|
1029 | if ( !foundit ) len++; |
---|
1030 | } |
---|
1031 | /* Allocate the new string */ |
---|
1032 | q = rv = (xmlChar *) xmlMalloc(len+1); |
---|
1033 | /* copy str to rv, escaping when necessary */ |
---|
1034 | for ( p = str; *p ; p++) { |
---|
1035 | int foundit = 0; |
---|
1036 | for ( e = escapes; !foundit && e->c ; e++ ) { |
---|
1037 | if ( *p == e->c ) { |
---|
1038 | strncpy((char *) q, (char *) e->esc, e->l); |
---|
1039 | q += e->l; |
---|
1040 | foundit = 1; |
---|
1041 | } |
---|
1042 | } |
---|
1043 | if ( !foundit ) *q++ = *p; |
---|
1044 | } |
---|
1045 | /* terminate rv */ |
---|
1046 | *q = '\0'; |
---|
1047 | return rv; |
---|
1048 | } |
---|
1049 | |
---|
1050 | xmlChar *encode_rt0_xml_v10(abac_attribute_t *a) { |
---|
1051 | return minimal_xml_escaping(abac_attribute_role_string(a)); |
---|
1052 | } |
---|
1053 | |
---|
1054 | static char *head_template = |
---|
1055 | "<head>\n" |
---|
1056 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
1057 | " <role>%s</role>\n" |
---|
1058 | "</head>\n"; |
---|
1059 | |
---|
1060 | static char *tail_template[] = { |
---|
1061 | "<tail>\n" |
---|
1062 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
1063 | "</tail>\n", |
---|
1064 | "<tail>\n" |
---|
1065 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
1066 | " <role>%s</role>\n" |
---|
1067 | "</tail>\n", |
---|
1068 | "<tail>\n" |
---|
1069 | " <ABACprincipal><keyid>%s</keyid></ABACprincipal>\n" |
---|
1070 | " <role>%s</role>\n" |
---|
1071 | " <linking_role>%s</linking_role>\n" |
---|
1072 | "</tail>\n", |
---|
1073 | }; |
---|
1074 | |
---|
1075 | xmlChar *encode_rt0_xml_v11(abac_attribute_t *a) { |
---|
1076 | int htlen = strlen(head_template); |
---|
1077 | int ttlen = strlen(tail_template[2]); |
---|
1078 | int sz = strlen(abac_attribute_get_head(a)) + htlen; |
---|
1079 | int ntails = abac_attribute_get_ntails(a); |
---|
1080 | char *princ_role[2]; |
---|
1081 | char *copy = abac_xstrdup(abac_attribute_get_head(a)); |
---|
1082 | int npr = 2; |
---|
1083 | char *tmp = NULL; |
---|
1084 | char *rv = NULL; |
---|
1085 | int i; |
---|
1086 | |
---|
1087 | for ( i = 0 ; i < ntails; i++) |
---|
1088 | sz += strlen(abac_attribute_get_tail_n(a, i)) + ttlen; |
---|
1089 | |
---|
1090 | if ( !(rv = (char *) xmlMalloc(sz)) ) goto fail; |
---|
1091 | if ( !(tmp = (char *) xmlMalloc(sz)) ) goto fail; |
---|
1092 | |
---|
1093 | abac_split(copy, ".", princ_role, &npr); |
---|
1094 | if ( npr != 2) |
---|
1095 | goto fail; |
---|
1096 | |
---|
1097 | sz -= snprintf(rv, sz, head_template, princ_role[0], princ_role[1]); |
---|
1098 | |
---|
1099 | for ( i = 0 ; i < ntails; i++) { |
---|
1100 | abac_role_t *r = abac_role_from_string(abac_attribute_get_tail_n(a,i)); |
---|
1101 | int ts; |
---|
1102 | |
---|
1103 | if ( !r ) |
---|
1104 | goto fail; |
---|
1105 | |
---|
1106 | if ( abac_role_is_principal(r)) { |
---|
1107 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
1108 | |
---|
1109 | ts = snprintf(tmp, sz, tail_template[0], p); |
---|
1110 | free(p); |
---|
1111 | } else if (abac_role_is_role(r)) { |
---|
1112 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
1113 | char *ro = minimal_xml_escaping(abac_role_role_name(r)); |
---|
1114 | |
---|
1115 | ts = snprintf(tmp, sz, tail_template[1], p, ro); |
---|
1116 | free(p); |
---|
1117 | free(ro); |
---|
1118 | } else if (abac_role_is_linking(r)) { |
---|
1119 | char *p = minimal_xml_escaping(abac_role_principal(r)); |
---|
1120 | char *ro = minimal_xml_escaping(abac_role_role_name(r)); |
---|
1121 | char *li = minimal_xml_escaping(abac_role_linking_role(r)); |
---|
1122 | |
---|
1123 | ts = snprintf(tmp, sz, tail_template[2], p, ro, li); |
---|
1124 | free(p); |
---|
1125 | free(ro); |
---|
1126 | free(li); |
---|
1127 | } |
---|
1128 | |
---|
1129 | free(r); |
---|
1130 | |
---|
1131 | if ( ts < 0 ) |
---|
1132 | goto fail; |
---|
1133 | |
---|
1134 | strncat(rv, tmp, sz); |
---|
1135 | sz -= ts; |
---|
1136 | } |
---|
1137 | free(tmp); |
---|
1138 | return (xmlChar *) rv; |
---|
1139 | |
---|
1140 | fail: |
---|
1141 | if (rv ) free(rv); |
---|
1142 | if (tmp) free(tmp); |
---|
1143 | return NULL; |
---|
1144 | } |
---|
1145 | |
---|
1146 | /* Make an new GENI abac credential with the rt0 rule that expires secs from |
---|
1147 | * now. cert is the PEM encoded X.509 of the issuer's certificate as a string. |
---|
1148 | * certlen is the length of cert. Returns the XML. Caller is responsible for |
---|
1149 | * freeing it. */ |
---|
1150 | char *make_credential(abac_attribute_t *attr, int secs, char *in_cert, |
---|
1151 | int in_certlen) { |
---|
1152 | xmlSecByte *cert = (xmlSecByte *) in_cert; /* Cast of certificate */ |
---|
1153 | xmlSecSize certlen = (xmlSecSize) in_certlen; /* Cast of len */ |
---|
1154 | xmlDocPtr doc = NULL; /* parsed XML document */ |
---|
1155 | xmlNodePtr root = NULL; /* Root of the document */ |
---|
1156 | xmlNodePtr signNode = NULL; /* <Signature> element */ |
---|
1157 | xmlSecDSigCtxPtr dsigCtx = NULL; /* Signing context */ |
---|
1158 | /*xmlChar *rt0_escaped = minimal_xml_escaping(rt0); /* RT0, escaped */ |
---|
1159 | xmlChar *rt0_xml = NULL; /* attr's RT0 as xml */ |
---|
1160 | xmlChar *rv = NULL; /* return value */ |
---|
1161 | time_t exp; /* expriation time (seconds since epoch) */ |
---|
1162 | struct tm exp_tm; /* expiration for formatting */ |
---|
1163 | char estr[EXPIRESLEN+1]; /* String with formatted expiration */ |
---|
1164 | char *temp = NULL; /* populated XML template */ |
---|
1165 | int len = 0; /* length of the populated template (temp) */ |
---|
1166 | |
---|
1167 | GENI_xml_processing_t *proc = get_xml_processing("1.1"); |
---|
1168 | |
---|
1169 | if ( !proc ) goto fail; |
---|
1170 | if ( !(rt0_xml = proc->rt0_to_xml(attr))) goto fail; |
---|
1171 | |
---|
1172 | /* Calculate the length of the populated template and allocate it */ |
---|
1173 | len = strlen((char *) proc->out_template)+EXPIRESLEN+ |
---|
1174 | strlen((char *) rt0_xml)+1; |
---|
1175 | |
---|
1176 | if ( !(temp = malloc(len)) ) |
---|
1177 | goto fail; |
---|
1178 | |
---|
1179 | /* format expiration */ |
---|
1180 | time(&exp); |
---|
1181 | exp += secs; |
---|
1182 | gmtime_r(&exp, &exp_tm); |
---|
1183 | |
---|
1184 | if (strftime(estr, EXPIRESLEN+1, strftime_fmt, &exp_tm) == 0 ) |
---|
1185 | goto fail; |
---|
1186 | |
---|
1187 | /* Populate template with expiration and escaped rt0 */ |
---|
1188 | snprintf(temp, len, proc->out_template, estr, (char *) rt0_xml); |
---|
1189 | |
---|
1190 | /* parse the populated template */ |
---|
1191 | if ( !(doc = xmlParseMemory(temp, len))) |
---|
1192 | goto fail; |
---|
1193 | |
---|
1194 | if (!(root = xmlDocGetRootElement(doc)) ) |
---|
1195 | goto fail; |
---|
1196 | |
---|
1197 | /* Find the signature element for the Signing call */ |
---|
1198 | signNode = xmlSecFindNode(root, xmlSecNodeSignature, xmlSecDSigNs); |
---|
1199 | |
---|
1200 | /* Create the context */ |
---|
1201 | if ( !(dsigCtx = xmlSecDSigCtxCreate(NULL))) |
---|
1202 | goto fail; |
---|
1203 | |
---|
1204 | /* Assign the key (a PEM key) */ |
---|
1205 | if (!(dsigCtx->signKey = xmlSecCryptoAppKeyLoadMemory(cert, certlen, |
---|
1206 | xmlSecKeyDataFormatPem, NULL, NULL, NULL)) ) |
---|
1207 | goto fail; |
---|
1208 | |
---|
1209 | /* Load the certificate */ |
---|
1210 | if ( xmlSecCryptoAppKeyCertLoadMemory(dsigCtx->signKey, cert, certlen, |
---|
1211 | xmlSecKeyDataFormatPem) < 0) |
---|
1212 | goto fail; |
---|
1213 | |
---|
1214 | /* Sign it */ |
---|
1215 | if ( xmlSecDSigCtxSign(dsigCtx, signNode) < 0) |
---|
1216 | goto fail; |
---|
1217 | |
---|
1218 | /* Store the signed credential to rv */ |
---|
1219 | xmlDocDumpMemoryEnc(doc, &rv, &len, "UTF-8"); |
---|
1220 | fail: |
---|
1221 | /* clean up */ |
---|
1222 | if (dsigCtx) |
---|
1223 | xmlSecDSigCtxDestroy(dsigCtx); |
---|
1224 | if ( doc) xmlFreeDoc(doc); |
---|
1225 | if (rt0_xml) xmlFree(rt0_xml); |
---|
1226 | if ( temp) free(temp); |
---|
1227 | return (char *) rv; |
---|
1228 | } |
---|
1229 | |
---|
1230 | #define CERTSIZE 4096 |
---|
1231 | /* Read a file into a the dynamically allocated array buf. Whatever was in buf |
---|
1232 | * is discarded w/o freeing so it should initially be NULL and len 0. On return |
---|
1233 | * buf contains as much of the contents of filename as possible and len is the |
---|
1234 | * length of it. The caller must free() buf. buf is zero terminated.*/ |
---|
1235 | static void read_cert(char *filename, char **buf, int *len) { |
---|
1236 | FILE *cert = NULL; |
---|
1237 | char *nbuf = NULL; |
---|
1238 | int cap = CERTSIZE; |
---|
1239 | int r = 0; |
---|
1240 | |
---|
1241 | *len = 0; |
---|
1242 | if (!(*buf = malloc(CERTSIZE))) return; |
---|
1243 | |
---|
1244 | if ( !(cert = fopen(filename, "r"))) |
---|
1245 | goto fail; |
---|
1246 | |
---|
1247 | /* Read cert, expanding buf as necessary */ |
---|
1248 | while ( (r = fread(*buf + *len, 1, cap - *len, cert)) != 0) { |
---|
1249 | *len += r; |
---|
1250 | if ( *len == cap ) { |
---|
1251 | if ( !(nbuf = realloc(*buf, cap + CERTSIZE)) ) |
---|
1252 | goto fail; |
---|
1253 | memcpy(nbuf, *buf, cap); |
---|
1254 | cap += CERTSIZE; |
---|
1255 | *buf = nbuf; |
---|
1256 | } |
---|
1257 | } |
---|
1258 | /* Extend if we read exactly cap bytes so we can terminate the string */ |
---|
1259 | if ( *len == cap ) { |
---|
1260 | if ( !(nbuf = realloc(*buf, cap + CERTSIZE)) ) |
---|
1261 | goto fail; |
---|
1262 | memcpy(nbuf, *buf, cap); |
---|
1263 | cap += CERTSIZE; |
---|
1264 | *buf = nbuf; |
---|
1265 | } |
---|
1266 | (*buf)[*len] = '\0'; |
---|
1267 | return; |
---|
1268 | fail: |
---|
1269 | if ( *buf) free(*buf); |
---|
1270 | *buf = NULL; |
---|
1271 | *len = 0; |
---|
1272 | return; |
---|
1273 | } |
---|
1274 | |
---|
1275 | |
---|
1276 | /******** helper functions used by libabac **********************/ |
---|
1277 | |
---|
1278 | /* Function to disable libXML2's debugging */ |
---|
1279 | static void _nullGenericErrorFunc(void* ctxt, const char* msg, ...) { return; } |
---|
1280 | |
---|
1281 | /* Straight off http://www.aleksey.com/xmlsec/api/xmlsec-examples.html . |
---|
1282 | * Voodoo. But call it. */ |
---|
1283 | int init_xmlsec() { |
---|
1284 | /* Init xmlsec library */ |
---|
1285 | if(xmlSecInit() < 0) { |
---|
1286 | fprintf(stderr, "Error: xmlsec initialization failed.\n"); |
---|
1287 | return(-1); |
---|
1288 | } |
---|
1289 | |
---|
1290 | /* Check loaded library version */ |
---|
1291 | if(xmlSecCheckVersion() != 1) { |
---|
1292 | fprintf(stderr, |
---|
1293 | "Error: loaded xmlsec library version is not compatible.\n"); |
---|
1294 | return(-1); |
---|
1295 | } |
---|
1296 | |
---|
1297 | /* Load default crypto engine if we are supporting dynamic |
---|
1298 | * loading for xmlsec-crypto libraries. Use the crypto library |
---|
1299 | * name ("openssl", "nss", etc.) to load corresponding |
---|
1300 | * xmlsec-crypto library. |
---|
1301 | */ |
---|
1302 | #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING |
---|
1303 | if(xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) { |
---|
1304 | fprintf(stderr, "Error: unable to load default xmlsec-crypto library. " |
---|
1305 | "Make sure\n" |
---|
1306 | "that you have it installed and check shared libraries path\n" |
---|
1307 | "(LD_LIBRARY_PATH) envornment variable.\n"); |
---|
1308 | return(-1); |
---|
1309 | } |
---|
1310 | #endif /* XMLSEC_CRYPTO_DYNAMIC_LOADING */ |
---|
1311 | |
---|
1312 | /* Init crypto library */ |
---|
1313 | if(xmlSecCryptoAppInit(NULL) < 0) { |
---|
1314 | fprintf(stderr, "Error: crypto initialization failed.\n"); |
---|
1315 | return(-1); |
---|
1316 | } |
---|
1317 | |
---|
1318 | /* Init xmlsec-crypto library */ |
---|
1319 | if(xmlSecCryptoInit() < 0) { |
---|
1320 | fprintf(stderr, "Error: xmlsec-crypto initialization failed.\n"); |
---|
1321 | return(-1); |
---|
1322 | } |
---|
1323 | /* Turn off the built in debugging */ |
---|
1324 | xmlThrDefSetGenericErrorFunc(NULL, _nullGenericErrorFunc); |
---|
1325 | xmlSetGenericErrorFunc(NULL, _nullGenericErrorFunc); |
---|
1326 | |
---|
1327 | return 0; |
---|
1328 | } |
---|
1329 | |
---|
1330 | int deinit_xmlsec() { |
---|
1331 | /* no op for now */ |
---|
1332 | return 0; |
---|
1333 | } |
---|
1334 | |
---|
1335 | |
---|
1336 | /* parse the xml blob and extract keyid */ |
---|
1337 | char *get_keyid_from_xml(char *xml) { |
---|
1338 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
1339 | xmlChar keyid[SHA_DIGEST_LENGTH]; /* Issuer key SHA1 */ |
---|
1340 | xmlChar text_keyid[2*SHA_DIGEST_LENGTH+1];/* Issuer keyid as text */ |
---|
1341 | char *ret=NULL; |
---|
1342 | |
---|
1343 | /* Get the issuer keyid */ |
---|
1344 | if ( !get_keyid_from_keyinfo(doc, keyid)) |
---|
1345 | goto fail; |
---|
1346 | sha1_to_text(keyid, text_keyid); |
---|
1347 | ret=strdup((char *)text_keyid); |
---|
1348 | fail: |
---|
1349 | xmlFreeDoc(doc); |
---|
1350 | return ret; |
---|
1351 | } |
---|
1352 | |
---|
1353 | /* parse xml and get the expected expiration time and returns |
---|
1354 | * (expiration time-current time) |
---|
1355 | */ |
---|
1356 | long get_validity_from_xml(char *xml) { |
---|
1357 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
1358 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
1359 | xmlNodePtr expires = NULL; /* XML expires node */ |
---|
1360 | struct tm tv; /* Parsed expires field */ |
---|
1361 | time_t now; /* Now in seconds since the epoch */ |
---|
1362 | time_t exp; /* expires in seconds since the epoch */ |
---|
1363 | long dtime=0; |
---|
1364 | |
---|
1365 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
1366 | goto fail; |
---|
1367 | |
---|
1368 | if ( !(expires = xmlSecFindNode(node, (xmlChar *) GENI_expires, NULL))) |
---|
1369 | goto fail; |
---|
1370 | |
---|
1371 | xmlChar *etime=get_element_content(expires); |
---|
1372 | time(&now); |
---|
1373 | |
---|
1374 | strptime((char *) etime, "%FT%TZ", &tv); |
---|
1375 | exp = timegm(&tv); |
---|
1376 | dtime=difftime(exp, now); |
---|
1377 | |
---|
1378 | fail: |
---|
1379 | xmlFreeDoc(doc); |
---|
1380 | return dtime; |
---|
1381 | } |
---|
1382 | |
---|
1383 | /* parse xml structure and extract the attribute rules */ |
---|
1384 | char **get_rt0_from_xml(void *ctxt_id_certs,char *xml) { |
---|
1385 | xmlDocPtr doc=xmlParseMemory(xml,strlen(xml)); |
---|
1386 | xmlNodePtr node = NULL; /* XML scratch node */ |
---|
1387 | xmlChar *text = NULL; /* Text of the type field */ |
---|
1388 | xmlChar **rv = NULL; /* return value from parse_* */ |
---|
1389 | |
---|
1390 | if ( !check_signature(doc) ) |
---|
1391 | goto fail; |
---|
1392 | /* Parse out the type field */ |
---|
1393 | if ( !(node = xmlDocGetRootElement(doc)) ) |
---|
1394 | goto fail; |
---|
1395 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_credential, NULL))) |
---|
1396 | goto fail; |
---|
1397 | if ( !(node = xmlSecFindNode(node, (xmlChar *) GENI_type, NULL))) |
---|
1398 | goto fail; |
---|
1399 | |
---|
1400 | if ( !(text = get_element_content(node)) ) |
---|
1401 | goto fail; |
---|
1402 | |
---|
1403 | /* Demux on type */ |
---|
1404 | if ( !strcmp((char *) text, "privilege")) { |
---|
1405 | rv = parse_privilege(doc,ctxt_id_certs); |
---|
1406 | } else if ( !strcmp((char *) text, "abac")) { |
---|
1407 | rv = parse_abac(doc, ctxt_id_certs); |
---|
1408 | } else { |
---|
1409 | goto fail; |
---|
1410 | } |
---|
1411 | fail: |
---|
1412 | xmlFreeDoc(doc); |
---|
1413 | return (char **)rv; |
---|
1414 | } |
---|
1415 | |
---|
1416 | |
---|