[186cb75] | 1 | |
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[461541a] | 2 | /* abac_verifier.c */ |
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| 3 | #include <assert.h> |
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[13b087a] | 4 | #include <string.h> |
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[5450aeb] | 5 | |
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[461541a] | 6 | #include "libabac_common.h" |
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| 7 | #include "abac.h" |
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[342e28f] | 8 | #include "abac_list.h" |
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[3c251d0] | 9 | #include "abac_util.h" |
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[5450aeb] | 10 | |
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[bec30b5] | 11 | struct _abac_id_cert_t { |
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[461541a] | 12 | char *keyid; // using cert's keyid |
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| 13 | abac_id_t *cert; |
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[bec30b5] | 14 | }; |
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[5450aeb] | 15 | |
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[401a054] | 16 | struct _abac_credential_t { |
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[1743825] | 17 | abac_role_t *head; |
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| 18 | abac_role_t *tail; |
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[461541a] | 19 | abac_id_t *issuer; /* Acme of Acme.customer <- Coyote */ |
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| 20 | abac_attribute_t *cert; |
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[fbb591e] | 21 | |
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| 22 | int refcount; |
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[5f99fbc] | 23 | }; |
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| 24 | |
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[ec550f7] | 25 | extern int abac_id_pass_privkey_from_id(abac_id_t *to_id, abac_id_t *from_id); |
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| 26 | extern char *make_pem_from_naked_pem(char *naked_pem); |
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| 27 | |
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[461541a] | 28 | /***********************************************************************/ |
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[5450aeb] | 29 | // convert a chunk to a lowercase binary string |
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| 30 | // malloc's the string |
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[9ac7fb4] | 31 | /*** not used, |
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[461541a] | 32 | static char *_chunk_to_string(abac_chunk_t chunk) { |
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[5450aeb] | 33 | int i; |
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| 34 | |
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[3c251d0] | 35 | char *ret = abac_xmalloc(chunk.len * 2 + 1); |
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[5450aeb] | 36 | |
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| 37 | for (i = 0; i < chunk.len; ++i) |
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| 38 | sprintf(ret + 2 * i, "%02x", chunk.ptr[i]); |
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| 39 | |
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| 40 | return ret; |
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| 41 | } |
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[9ac7fb4] | 42 | ***/ |
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[5450aeb] | 43 | |
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| 44 | // verify that cert was issued by issuer |
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| 45 | // cert and issuer can be the same, in which case the self-sig is validated |
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[9ac7fb4] | 46 | /*** not used |
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[461541a] | 47 | static int _verify_cert(abac_id_t *cert) { |
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| 48 | |
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| 49 | assert(cert); |
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| 50 | if(!abac_id_still_valid(cert)) |
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| 51 | return 0; |
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| 52 | return 1; |
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[5450aeb] | 53 | } |
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[9ac7fb4] | 54 | ***/ |
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[5450aeb] | 55 | |
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| 56 | /** |
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| 57 | * Init the verifier subsystem. |
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| 58 | */ |
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[43e3b71] | 59 | void abac_verifier_init(void) { |
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[461541a] | 60 | init_openssl(); |
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| 61 | init_xmlsec(); |
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[5450aeb] | 62 | } |
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| 63 | |
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[186cb75] | 64 | /** |
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| 65 | * Uninitialize the system, free up any allocated memory. |
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| 66 | */ |
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[43e3b71] | 67 | void abac_verifier_deinit(void) { |
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[461541a] | 68 | deinit_xmlsec(); |
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| 69 | deinit_openssl(); |
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[186cb75] | 70 | } |
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| 71 | |
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[bec30b5] | 72 | static abac_id_cert_t *_lookup_cert(abac_list_t *id_certs, char *keyid) |
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| 73 | { |
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| 74 | abac_id_cert_t *id_cert=NULL; |
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| 75 | if(id_certs != NULL) { |
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| 76 | abac_list_foreach(id_certs, id_cert, |
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| 77 | if(strcmp(keyid,id_cert->keyid)==0) |
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| 78 | return id_cert; |
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| 79 | ); |
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| 80 | } |
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| 81 | return NULL; |
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| 82 | } |
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| 83 | |
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[5450aeb] | 84 | /** |
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| 85 | * Load an ID certificate. |
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| 86 | */ |
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[f2622ee] | 87 | static int _load_id(abac_list_t *id_certs, abac_id_t **cert, |
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[94605f2] | 88 | abac_keyid_map_t *km) { |
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[327e808] | 89 | abac_id_cert_t *id_cert = NULL; |
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[5450aeb] | 90 | char *keyid = NULL; |
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[94605f2] | 91 | char *nick = NULL; |
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[5450aeb] | 92 | int ret; |
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| 93 | |
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[f2622ee] | 94 | assert(*cert); |
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[5450aeb] | 95 | |
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[2ef48fa] | 96 | // get the key ID |
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[f2622ee] | 97 | keyid = abac_id_keyid(*cert); |
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[327e808] | 98 | |
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| 99 | // if we already have this cert 'error' with success |
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[bec30b5] | 100 | id_cert=_lookup_cert(id_certs, keyid); |
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| 101 | |
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[327e808] | 102 | if (id_cert != NULL) { |
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[ec550f7] | 103 | /* special case, if |
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| 104 | existing id does not have private key and |
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| 105 | incoming does, then need to bring that bit of |
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| 106 | information in */ |
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[f2622ee] | 107 | if(abac_id_has_privkey(*cert) && |
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[ec550f7] | 108 | !abac_id_has_privkey(id_cert->cert)) { |
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[f2622ee] | 109 | abac_id_pass_privkey_from_id(id_cert->cert, *cert); |
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[ec550f7] | 110 | } |
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[f2622ee] | 111 | /* free the new one and set the ptr to dup of old */ |
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| 112 | abac_id_free(*cert); |
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| 113 | *cert=abac_id_dup(id_cert->cert); |
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| 114 | ret = ABAC_CERT_SUCCESS; |
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[327e808] | 115 | goto error; |
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| 116 | } |
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| 117 | |
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[f2622ee] | 118 | ret = abac_id_still_valid(*cert); |
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[0779c99] | 119 | if (!ret) { |
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[461541a] | 120 | ret = ABAC_CERT_INVALID; |
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[0779c99] | 121 | goto error; |
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| 122 | } |
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[5450aeb] | 123 | |
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| 124 | // success, add the key to the map of certificates |
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[327e808] | 125 | id_cert = abac_xmalloc(sizeof(abac_id_cert_t)); |
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[461541a] | 126 | id_cert->keyid = abac_xstrdup(keyid); |
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[f2622ee] | 127 | id_cert->cert = *cert; |
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[bec30b5] | 128 | abac_list_add(id_certs, id_cert); |
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[94605f2] | 129 | /* Add the new id and issuer to the keyid <-> name map */ |
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[f2622ee] | 130 | if ( km && keyid && *cert ) { |
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| 131 | if ( (nick= abac_id_issuer(*cert)) ) { |
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[94605f2] | 132 | /* If the issuer starts with /CN=, as many do, |
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| 133 | * trim the /CN= off */ |
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| 134 | if (!strncmp(nick, "/CN=", 4) && strlen(nick) > 4) |
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| 135 | abac_keyid_map_add_nickname(km, keyid, nick+4); |
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| 136 | else |
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| 137 | abac_keyid_map_add_nickname(km, keyid, nick); |
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| 138 | free(nick); |
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| 139 | } |
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| 140 | } |
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| 141 | |
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[5450aeb] | 142 | |
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[0779c99] | 143 | return ABAC_CERT_SUCCESS; |
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[5450aeb] | 144 | |
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| 145 | error: |
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[ea38d81] | 146 | // No one owns cert, so delete it. |
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[f2622ee] | 147 | if (*cert != NULL) abac_id_free(*cert); |
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| 148 | |
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[0779c99] | 149 | return ret; |
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[5450aeb] | 150 | } |
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| 151 | |
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[bec30b5] | 152 | abac_id_t *abac_verifier_lookup_id(abac_list_t *id_certs, char *keyid) |
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[461541a] | 153 | { |
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[bec30b5] | 154 | abac_id_cert_t *id_cert=_lookup_cert(id_certs,keyid); |
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[461541a] | 155 | if(id_cert == NULL) return NULL; |
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| 156 | return id_cert->cert; |
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| 157 | } |
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| 158 | |
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[e898049] | 159 | /** |
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| 160 | * Load an ID cert from a file. |
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| 161 | */ |
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[94605f2] | 162 | int abac_verifier_load_id_file(abac_list_t *id_certs, char *filename, |
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| 163 | abac_keyid_map_t *km) { |
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[e898049] | 164 | // load the cert |
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[461541a] | 165 | abac_id_t *cert = abac_id_from_file(filename); |
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| 166 | |
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[e898049] | 167 | if (cert == NULL) |
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[0779c99] | 168 | return ABAC_CERT_INVALID; |
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[461541a] | 169 | |
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[f2622ee] | 170 | return _load_id(id_certs,&cert, km); |
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[e898049] | 171 | } |
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| 172 | |
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| 173 | /** |
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| 174 | * Load an ID cert from a chunk. |
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| 175 | */ |
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[94605f2] | 176 | int abac_verifier_load_id_chunk(abac_list_t *id_certs,abac_chunk_t chunk, |
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| 177 | abac_keyid_map_t *km) { |
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[461541a] | 178 | |
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[e898049] | 179 | // load the cert |
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[461541a] | 180 | abac_id_t *cert= abac_id_from_chunk(chunk); |
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| 181 | |
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[e898049] | 182 | if (cert == NULL) |
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[0779c99] | 183 | return ABAC_CERT_INVALID; |
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[f2622ee] | 184 | |
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| 185 | return _load_id(id_certs,&cert, km); |
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[e898049] | 186 | } |
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| 187 | |
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[ec550f7] | 188 | /** |
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| 189 | * Load an ID cert from a char ptr of a X509 pem data |
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[f2622ee] | 190 | * this is called from parse_privilege/parse_abac |
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[ec550f7] | 191 | */ |
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[831da18] | 192 | int abac_verifier_load_id_chars(abac_list_t *id_certs,char *naked_pem, |
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[94605f2] | 193 | abac_keyid_map_t *km) { |
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[bec30b5] | 194 | /* if id_certs is NULL, don't even try to load it */ |
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| 195 | if(id_certs == NULL) return ABAC_CERT_SUCCESS; |
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[ec550f7] | 196 | /* make a well formed pem from this */ |
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| 197 | char *new_naked_pem=abac_xstrdup(naked_pem); |
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| 198 | char *pem=make_pem_from_naked_pem(new_naked_pem); |
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| 199 | int len=strlen(pem); |
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| 200 | free(new_naked_pem); |
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[f2622ee] | 201 | |
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| 202 | abac_chunk_t chunk = { pem, len }; |
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| 203 | int rc=abac_verifier_load_id_chunk(id_certs,chunk, km); |
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| 204 | /* ??? MEI */ |
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| 205 | abac_chunk_free(chunk); |
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| 206 | return rc; |
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| 207 | |
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[ec550f7] | 208 | } |
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[5450aeb] | 209 | /** |
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| 210 | * Load an attribute cert. |
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| 211 | * Returns true only if the certificate is valid and is issued by the proper |
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| 212 | * authority. |
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| 213 | */ |
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[d2b198c] | 214 | static int _load_attribute_cert(abac_list_t *id_certs,abac_attribute_t *cert, |
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| 215 | abac_credential_t **cred_ret, abac_keyid_map_t *km) { |
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[1743825] | 216 | abac_role_t *head_role = NULL; |
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| 217 | abac_role_t *tail_role = NULL; |
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[461541a] | 218 | abac_id_cert_t *issuer=NULL; |
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[d2b198c] | 219 | abac_keyid_map_t *local_names = NULL; |
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[461541a] | 220 | int ret; |
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[5450aeb] | 221 | |
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[461541a] | 222 | char *attr_string=abac_attribute_role_string(cert); |
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[5450aeb] | 223 | |
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[461541a] | 224 | if(attr_string == NULL) { |
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| 225 | ret = ABAC_CERT_INVALID; |
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| 226 | goto error; |
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[0779c99] | 227 | } |
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[5450aeb] | 228 | |
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| 229 | // split into head/tail parts |
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[342e28f] | 230 | char *head_tail[2]; |
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[9f78e4c] | 231 | ret = 2; |
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[461541a] | 232 | abac_split(attr_string, "<-", head_tail, &ret); |
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[0779c99] | 233 | if (ret != 2) { |
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| 234 | ret = ABAC_CERT_INVALID; |
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| 235 | goto error; |
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| 236 | } |
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[5450aeb] | 237 | |
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| 238 | // must be a role |
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[342e28f] | 239 | head_role = abac_role_from_string(head_tail[0]); |
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[5450aeb] | 240 | if (head_role == NULL) goto error; |
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[0779c99] | 241 | if (!abac_role_is_role(head_role)) { |
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| 242 | ret = ABAC_CERT_INVALID; |
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| 243 | goto error; |
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| 244 | } |
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[5450aeb] | 245 | |
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[9a411d7] | 246 | // make sure the tail's valid too |
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| 247 | tail_role = abac_role_from_string(head_tail[1]); |
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| 248 | if (tail_role == NULL) { |
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| 249 | ret = ABAC_CERT_INVALID; |
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| 250 | goto error; |
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[0779c99] | 251 | } |
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[5450aeb] | 252 | |
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[dcc1a8e] | 253 | char *principal = abac_role_principal(head_role); |
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[bec30b5] | 254 | issuer=_lookup_cert(id_certs,principal); |
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[0779c99] | 255 | if (issuer == NULL) { |
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| 256 | ret = ABAC_CERT_MISSING_ISSUER; |
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| 257 | goto error; |
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| 258 | } |
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[5450aeb] | 259 | |
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[461541a] | 260 | // check if issuer is still valid |
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| 261 | if (!abac_id_still_valid(issuer->cert)) { |
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| 262 | ret = ABAC_CERT_INVALID_ISSUER; |
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[0779c99] | 263 | goto error; |
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| 264 | } |
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[5450aeb] | 265 | |
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[461541a] | 266 | // make sure principal match up with keyid |
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| 267 | if(!abac_id_has_keyid(issuer->cert,principal)) { |
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| 268 | ret = ABAC_CERT_BAD_PRINCIPAL; |
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| 269 | goto error; |
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| 270 | } |
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[d2b198c] | 271 | |
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| 272 | if ( (local_names = abac_attribute_get_keyid_map(cert)) && km ) |
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| 273 | abac_keyid_map_merge(km, local_names, 1); |
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[461541a] | 274 | |
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[5450aeb] | 275 | // at this point we know we have a good attribute cert |
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[401a054] | 276 | abac_credential_t *cred = abac_xmalloc(sizeof(abac_credential_t)); |
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| 277 | cred->head = head_role; |
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| 278 | cred->tail = tail_role; |
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| 279 | cred->cert = cert; |
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[f2622ee] | 280 | |
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[461541a] | 281 | /* acme's cert */ |
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| 282 | cred->issuer = abac_id_dup(issuer->cert); |
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[fbb591e] | 283 | cred->refcount = 1; |
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[0779c99] | 284 | *cred_ret = cred; |
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[5450aeb] | 285 | |
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[f2622ee] | 286 | free(attr_string); |
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| 287 | |
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[0779c99] | 288 | return ABAC_CERT_SUCCESS; |
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[5450aeb] | 289 | |
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| 290 | error: |
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[f2622ee] | 291 | free(attr_string); |
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[dcc1a8e] | 292 | if (head_role != NULL) abac_role_free(head_role); |
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| 293 | if (tail_role != NULL) abac_role_free(tail_role); |
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[5450aeb] | 294 | |
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[0779c99] | 295 | return ret; |
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[5450aeb] | 296 | } |
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[5f99fbc] | 297 | |
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[d2b198c] | 298 | static int _load_attribute_certs(abac_list_t *id_certs,abac_list_t *attr_list, |
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| 299 | abac_list_t *cred_list, abac_keyid_map_t *km) { |
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[461541a] | 300 | |
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| 301 | int sz=abac_list_size(attr_list); |
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| 302 | abac_credential_t *cred_ret=NULL; |
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| 303 | abac_attribute_t *attr; |
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| 304 | if(sz) { |
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| 305 | abac_list_foreach(attr_list, attr, |
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[f2622ee] | 306 | /* attr is being used to build cred_ret, so, don't remove it */ |
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[d2b198c] | 307 | int ret=_load_attribute_cert(id_certs, attr, &cred_ret, km); |
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[461541a] | 308 | if(ret==ABAC_CERT_SUCCESS) { |
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| 309 | abac_list_add(cred_list, cred_ret); |
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| 310 | } |
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| 311 | ); |
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| 312 | } |
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[f2622ee] | 313 | /* ??? MEI, attr is being reused, just free the list ptr */ |
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| 314 | abac_list_free(attr_list); |
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[461541a] | 315 | return sz; |
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| 316 | } |
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| 317 | |
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[e898049] | 318 | /** |
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| 319 | * Load an attribute cert from a file. |
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| 320 | */ |
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[d2b198c] | 321 | int abac_verifier_load_attribute_cert_file(abac_list_t *id_certs,char *filename, abac_list_t *cred_list, abac_keyid_map_t *km) { |
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[461541a] | 322 | |
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[e898049] | 323 | // load the cert |
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[bec30b5] | 324 | abac_list_t *attr_list = abac_attribute_certs_from_file(id_certs,filename); |
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[461541a] | 325 | |
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| 326 | if (abac_list_size(attr_list) == 0) |
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| 327 | return ABAC_CERT_INVALID; |
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| 328 | |
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[d2b198c] | 329 | int ret=_load_attribute_certs(id_certs,attr_list, cred_list, km); |
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[461541a] | 330 | |
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| 331 | if(ret) return ABAC_CERT_SUCCESS; |
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[0779c99] | 332 | return ABAC_CERT_INVALID; |
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[e898049] | 333 | } |
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| 334 | |
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| 335 | /** |
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| 336 | * Load an attribute cert from a chunk. |
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| 337 | */ |
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[d2b198c] | 338 | int abac_verifier_load_attribute_cert_chunk(abac_list_t *id_certs,abac_chunk_t chunk, abac_list_t *cred_list, abac_keyid_map_t *km) { |
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[461541a] | 339 | |
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[e898049] | 340 | // load the cert |
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[bec30b5] | 341 | abac_list_t *attr_list = abac_attribute_certs_from_chunk(id_certs,chunk); |
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[461541a] | 342 | |
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| 343 | if (abac_list_size(attr_list) == 0) |
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[0779c99] | 344 | return ABAC_CERT_INVALID; |
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[4721618] | 345 | |
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[d2b198c] | 346 | int ret=_load_attribute_certs(id_certs,attr_list,cred_list, km); |
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[4721618] | 347 | |
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| 348 | if(ret) return ABAC_CERT_SUCCESS; |
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| 349 | return ABAC_CERT_INVALID; |
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[e898049] | 350 | } |
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| 351 | |
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[5f99fbc] | 352 | /** |
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| 353 | * Return the head role. |
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| 354 | */ |
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[401a054] | 355 | abac_role_t *abac_credential_head(abac_credential_t *cred) { |
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| 356 | return cred->head; |
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[5f99fbc] | 357 | } |
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| 358 | |
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| 359 | /** |
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| 360 | * Return the tail role. |
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| 361 | */ |
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[401a054] | 362 | abac_role_t *abac_credential_tail(abac_credential_t *cred) { |
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| 363 | return cred->tail; |
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[5f99fbc] | 364 | } |
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[85cdf53] | 365 | |
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| 366 | /** |
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[461541a] | 367 | * Return the xml chunk of the attribute cert. |
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[85cdf53] | 368 | */ |
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[401a054] | 369 | abac_chunk_t abac_credential_attribute_cert(abac_credential_t *cred) { |
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[461541a] | 370 | assert(cred); assert(cred->cert); |
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| 371 | return abac_attribute_cert(cred->cert); |
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[85cdf53] | 372 | } |
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| 373 | |
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| 374 | /** |
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[461541a] | 375 | * Return the chunk of the issuer cert. |
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[85cdf53] | 376 | */ |
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[401a054] | 377 | abac_chunk_t abac_credential_issuer_cert(abac_credential_t *cred) { |
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[461541a] | 378 | assert(cred); assert(cred->issuer); |
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| 379 | abac_chunk_t ret= abac_id_in_PEM(cred->issuer); |
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[9efbfbf] | 380 | return ret; |
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[85cdf53] | 381 | } |
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[186cb75] | 382 | |
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| 383 | /** |
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[fbb591e] | 384 | * Increase the ref count of a credential. |
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[186cb75] | 385 | */ |
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[401a054] | 386 | abac_credential_t *abac_credential_dup(abac_credential_t *cred) { |
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| 387 | assert(cred != NULL); |
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[186cb75] | 388 | |
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[fbb591e] | 389 | ++cred->refcount; |
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| 390 | return cred; |
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[186cb75] | 391 | } |
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| 392 | |
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[bec30b5] | 393 | abac_id_cert_t *abac_id_cert_dup(abac_id_cert_t *id_cert) { |
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| 394 | assert(id_cert != NULL && id_cert->keyid!=NULL); |
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| 395 | |
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| 396 | abac_id_cert_t *new_cert = abac_xmalloc(sizeof(abac_id_cert_t)); |
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| 397 | new_cert->keyid=abac_xstrdup(id_cert->keyid); |
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| 398 | new_cert->cert=abac_id_dup(id_cert->cert); |
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| 399 | |
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| 400 | return new_cert; |
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| 401 | } |
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| 402 | |
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| 403 | |
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[186cb75] | 404 | /** |
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[fbb591e] | 405 | * Decrease the reference count of a credential, freeing it when it reaches 0. |
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[186cb75] | 406 | */ |
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[401a054] | 407 | void abac_credential_free(abac_credential_t *cred) { |
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| 408 | if (cred == NULL) |
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[186cb75] | 409 | return; |
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| 410 | |
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[fbb591e] | 411 | --cred->refcount; |
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| 412 | if (cred->refcount > 0) |
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| 413 | return; |
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| 414 | |
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[401a054] | 415 | abac_role_free(cred->head); |
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| 416 | abac_role_free(cred->tail); |
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[461541a] | 417 | abac_attribute_free(cred->cert); |
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| 418 | abac_id_free(cred->issuer); |
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[186cb75] | 419 | |
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[401a054] | 420 | free(cred); |
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[186cb75] | 421 | } |
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[bec30b5] | 422 | |
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| 423 | /** |
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| 424 | * remove an id cert, (not reference counted, so abac_id_certs are |
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| 425 | * deep-copied) |
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| 426 | */ |
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| 427 | void abac_id_cert_free(abac_id_cert_t *id_cert) { |
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| 428 | if (id_cert==NULL) |
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| 429 | return; |
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| 430 | |
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| 431 | abac_id_free(id_cert->cert); |
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| 432 | if(id_cert->keyid) free(id_cert->keyid); |
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| 433 | free(id_cert); |
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| 434 | } |
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| 435 | |
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| 436 | char *abac_id_cert_keyid(abac_id_cert_t *id_cert) |
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| 437 | { |
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| 438 | assert(id_cert); |
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| 439 | return id_cert->keyid; |
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| 440 | } |
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| 441 | |
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[4f79997] | 442 | char *abac_id_cert_cn(abac_id_cert_t *id_cert) |
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| 443 | { |
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| 444 | assert(id_cert); |
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| 445 | return abac_id_cn(id_cert->cert); |
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| 446 | } |
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| 447 | |
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[bec30b5] | 448 | |
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| 449 | |
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