1 | |
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2 | /** |
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3 | ** abac_id.c |
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4 | **/ |
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5 | |
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6 | #include <assert.h> |
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7 | #include <err.h> |
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8 | #include <time.h> |
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9 | |
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10 | // include the GNU extension of asprintf |
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11 | #define _GNU_SOURCE |
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12 | #include <stdio.h> |
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13 | #include <err.h> |
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14 | |
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15 | #include "abac_internal.h" |
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16 | #include "abac_util.h" |
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17 | |
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18 | static int debug=0; |
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19 | |
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20 | #define KEY_SUFFIX "_private.pem" |
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21 | #define CERT_SUFFIX "_ID.pem" |
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22 | |
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23 | extern private_key_t *abac_key_private_key(abac_key_t *ptr); |
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24 | extern abac_key_t *abac_key_file_new(char *filename, chunk_t potato); |
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25 | extern abac_key_t *abac_key_chunk_new(chunk_t keyblob, chunk_t potato); |
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26 | extern chunk_t abac_key_chunk(abac_key_t *); |
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27 | |
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28 | // |
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29 | // abac_id object |
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30 | // |
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31 | struct _abac_id_t { |
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32 | int idtype; /* default to string 'keyid' for now */ |
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33 | |
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34 | char *keyid; /* sha */ |
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35 | char *cn; |
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36 | |
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37 | certificate_t *cert; |
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38 | abac_key_t *key; |
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39 | |
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40 | int refcount; |
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41 | }; |
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42 | |
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43 | /****************************************************************/ |
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44 | // |
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45 | // Helper functions below |
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46 | // |
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47 | static char *_get_keyid(certificate_t *cert) { |
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48 | // get the keyid |
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49 | x509_t *x509 = (x509_t *)cert; |
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50 | chunk_t keyid = x509->get_subjectKeyIdentifier(x509); |
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51 | chunk_t string = chunk_to_hex(keyid, NULL, 0); |
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52 | return (char *)string.ptr; |
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53 | } |
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54 | |
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55 | static char *_create_dn(char *cn) { |
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56 | |
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57 | #define DN "cn=" |
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58 | |
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59 | char *dn = abac_xmalloc(sizeof(DN) + strlen(cn)); |
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60 | memcpy(dn, DN, sizeof(DN)); |
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61 | strcat(dn, cn); |
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62 | |
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63 | return dn; |
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64 | } |
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65 | |
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66 | /** |
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67 | * Generate ID certificate. |
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68 | * |
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69 | * validity is measured in seconds (as of 0.2.0) |
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70 | */ |
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71 | static certificate_t *_generate_cert(abac_key_t *keyptr, char *cn, int validity) { |
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72 | // build the DN |
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73 | char *dn_string = _create_dn(cn); |
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74 | libabac_init(); |
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75 | |
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76 | identification_t *id = identification_create_from_string(dn_string); |
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77 | if (id == NULL) |
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78 | errx(1, "couldn't create ID from DN %s", dn_string); |
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79 | free(dn_string); |
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80 | |
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81 | // get the private key |
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82 | private_key_t *private = abac_key_private_key(keyptr); |
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83 | if(private == NULL) |
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84 | errx(1, "couldn't create ID without private key"); |
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85 | |
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86 | public_key_t *public = private->get_public_key(private); |
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87 | if (public == NULL) |
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88 | errx(1, "couldn't get public key from private key"); |
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89 | |
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90 | // create a serial (stolen from strongswan pki) |
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91 | rng_t *rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK); |
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92 | if (!rng) |
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93 | errx(1, "no random number generator"); |
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94 | |
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95 | // random serial |
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96 | chunk_t serial = abac_generate_serial(); |
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97 | |
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98 | // validity period |
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99 | time_t not_before = time(NULL); |
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100 | time_t not_after = not_before + validity; |
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101 | |
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102 | // create! |
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103 | certificate_t *cert = lib->creds->create(lib->creds, |
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104 | CRED_CERTIFICATE, CERT_X509, |
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105 | BUILD_SIGNING_KEY, private, |
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106 | BUILD_PUBLIC_KEY, public, |
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107 | BUILD_SUBJECT, id, |
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108 | BUILD_NOT_BEFORE_TIME, not_before, |
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109 | BUILD_NOT_AFTER_TIME, not_after, |
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110 | BUILD_SERIAL, serial, |
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111 | BUILD_DIGEST_ALG, HASH_SHA1, |
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112 | BUILD_X509_FLAG, X509_CA, |
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113 | BUILD_PATHLEN, X509_NO_CONSTRAINT, |
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114 | BUILD_END |
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115 | ); |
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116 | if (cert == NULL) |
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117 | errx(1, "couldn't build cert :("); |
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118 | |
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119 | DESTROY_IF(id); |
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120 | DESTROY_IF(public); |
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121 | DESTROY_IF(private); |
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122 | free(serial.ptr); |
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123 | |
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124 | return cert; |
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125 | } |
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126 | |
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127 | #define BYTES_PER_LINE 64 |
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128 | |
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129 | // thx libstrongswan |
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130 | static void _encode_base64(FILE *out, chunk_t encoding) { |
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131 | int start; |
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132 | |
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133 | chunk_t b64 = chunk_to_base64(encoding, NULL); |
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134 | |
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135 | fprintf(out, "-----BEGIN CERTIFICATE-----\n"); |
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136 | |
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137 | for (start = 0; start < b64.len; start += BYTES_PER_LINE) { |
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138 | int left = b64.len - start; |
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139 | int len = left < BYTES_PER_LINE ? left : BYTES_PER_LINE; |
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140 | fwrite(b64.ptr + start, len, 1, out); |
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141 | fprintf(out, "\n"); |
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142 | } |
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143 | |
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144 | fprintf(out, "-----END CERTIFICATE-----\n"); |
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145 | |
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146 | free(b64.ptr); |
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147 | } |
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148 | /****************************************************************/ |
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149 | int abac_id_idtype(abac_id_t *id) |
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150 | { |
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151 | assert(id != NULL); |
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152 | return id->idtype; |
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153 | } |
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154 | |
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155 | char* abac_id_idtype_string(abac_id_t *id) |
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156 | { |
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157 | assert(id != NULL); |
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158 | return abac_idtype_string(id->idtype); |
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159 | } |
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160 | |
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161 | char *abac_id_keyid(abac_id_t *id) { |
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162 | assert(id != NULL); |
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163 | return id->keyid; |
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164 | } |
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165 | |
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166 | char *abac_id_cn(abac_id_t *id) { |
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167 | assert(id != NULL); |
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168 | return id->cn; |
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169 | } |
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170 | |
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171 | |
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172 | char *abac_id_name(abac_id_t *id) |
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173 | { |
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174 | assert(id != NULL); |
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175 | if(USE("ABAC_CN")) |
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176 | return abac_id_cn(id); |
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177 | else return abac_id_keyid(id); |
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178 | } |
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179 | |
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180 | char *abac_id_string(abac_id_t *id) |
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181 | { |
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182 | char *tmp=NULL; |
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183 | if(abac_id_has_privkey(id)) |
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184 | asprintf(&tmp,"(%s,%s,y)",abac_id_name(id),abac_id_idtype_string(id)); |
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185 | else asprintf(&tmp,"(%s,%s,n)",abac_id_name(id),abac_id_idtype_string(id)); |
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186 | return tmp; |
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187 | } |
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188 | |
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189 | /** |
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190 | * Get the issuer of an ID cert. |
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191 | * Returns a malloc'd string that must be free'd. |
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192 | */ |
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193 | char *abac_id_issuer(abac_id_t *id) { |
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194 | char *ret; |
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195 | int rv = asprintf(&ret, "%Y", id->cert->get_issuer(id->cert)); |
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196 | |
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197 | if (rv < 0) |
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198 | err(1, "couldn't malloc string for issuer\n"); |
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199 | |
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200 | return ret; |
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201 | } |
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202 | |
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203 | int abac_id_lastone(abac_id_t *ptr) |
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204 | { |
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205 | assert(ptr); |
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206 | if(ptr->refcount == 1) |
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207 | return 1; |
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208 | return 0; |
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209 | } |
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210 | |
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211 | |
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212 | /** |
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213 | * Gets the subject DN of an ID cert. |
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214 | * Returns a malloc'd string that must be free'd. |
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215 | */ |
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216 | char *abac_id_subject(abac_id_t *id) { |
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217 | char *ret; |
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218 | int rv = asprintf(&ret, "%Y", id->cert->get_subject(id->cert)); |
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219 | |
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220 | if (rv < 0) |
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221 | err(1, "couldn't malloc string for subject\n"); |
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222 | |
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223 | return ret; |
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224 | } |
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225 | |
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226 | /** |
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227 | * Get the validity period. |
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228 | */ |
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229 | void abac_id_validity(abac_id_t *id, time_t *not_before, time_t *not_after) { |
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230 | id->cert->get_validity(id->cert, NULL, not_before, not_after); |
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231 | } |
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232 | |
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233 | certificate_t *abac_id_cert(abac_id_t *id) { |
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234 | assert(id != NULL); |
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235 | return id->cert; |
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236 | } |
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237 | |
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238 | private_key_t *abac_id_privkey(abac_id_t *id) { |
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239 | assert(id != NULL); |
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240 | if(id->key !=0) |
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241 | return abac_key_private_key(id->key); |
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242 | return NULL; |
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243 | } |
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244 | |
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245 | abac_key_t *abac_id_keyptr(abac_id_t *id) |
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246 | { |
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247 | return id->key; |
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248 | } |
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249 | |
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250 | int abac_id_has_privkey(abac_id_t *id) { |
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251 | if(id->key !=0) |
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252 | return 1; |
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253 | return 0; |
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254 | } |
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255 | |
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256 | |
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257 | /** |
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258 | * Write the ID cert to an open file pointer. |
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259 | */ |
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260 | void abac_id_write_cert(abac_id_t *id, FILE *out) { |
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261 | assert(id != NULL); |
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262 | |
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263 | chunk_t encoding = chunk_empty; |
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264 | int rc=id->cert->get_encoding(id->cert,CERT_ASN1_DER,&encoding); |
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265 | if(rc) { |
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266 | _encode_base64(out, encoding); |
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267 | free(encoding.ptr); |
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268 | } |
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269 | } |
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270 | |
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271 | /** |
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272 | * Write the private key to a file. |
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273 | * Returns false if there's no private key loaded |
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274 | */ |
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275 | int abac_id_write_privkey(abac_id_t *id, FILE *out) |
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276 | { |
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277 | return abac_key_write_privkey(id->key, out); |
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278 | } |
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279 | |
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280 | /** |
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281 | * Get a DER-encoded chunk representing the cert. |
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282 | */ |
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283 | abac_chunk_t abac_id_cert_chunk(abac_id_t *id) { |
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284 | assert(id->cert); |
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285 | |
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286 | chunk_t encoding = chunk_empty; |
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287 | int rc= id->cert->get_encoding(id->cert, CERT_ASN1_DER, &encoding); |
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288 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
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289 | |
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290 | return ret; |
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291 | } |
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292 | |
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293 | /** |
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294 | * Get a PEM-encoded chunk representing the private key |
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295 | */ |
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296 | abac_chunk_t abac_id_privkey_chunk(abac_id_t *id) |
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297 | { |
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298 | chunk_t tmp=chunk_empty; |
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299 | if(id->key) { |
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300 | tmp=abac_key_chunk(id->key); |
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301 | } |
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302 | if(debug) |
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303 | fprintf(stderr,"abac_id_privkey_chunk tmp ptr, loc(%d)(%d)\n", (int)tmp.ptr, tmp.len); |
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304 | |
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305 | abac_chunk_t ret= {tmp.ptr, tmp.len}; |
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306 | if(debug) |
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307 | fprintf(stderr,"abac_id_privkey_chunk ptr, loc(%d)(%d)\n", (int)ret.ptr, ret.len); |
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308 | return ret; |
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309 | } |
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310 | |
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311 | void abac_id_print_key_chunk(abac_id_t *id) |
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312 | { |
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313 | if(id->key) |
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314 | print_abac_key("abac_id_print_key_chunk",id->key); |
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315 | } |
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316 | |
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317 | /** |
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318 | * Copy an abac ID. Actually just increases its reference count. |
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319 | */ |
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320 | abac_id_t *abac_id_dup(abac_id_t *id) { |
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321 | if(id) |
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322 | ++id->refcount; |
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323 | return id; |
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324 | } |
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325 | |
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326 | void abac_id_free(abac_id_t *id) { |
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327 | if (id == NULL) |
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328 | return; |
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329 | |
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330 | --id->refcount; |
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331 | if (id->refcount > 0) |
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332 | return; |
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333 | |
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334 | if(debug) |
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335 | fprintf(stderr,"making abac_id_free call on (%s)!!!\n", id->cn); |
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336 | // free once the reference count reaches 0 |
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337 | DESTROY_IF(id->cert); |
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338 | |
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339 | if(id->key) abac_key_free(id->key); |
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340 | |
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341 | free(id->keyid); |
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342 | free(id->cn); |
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343 | free(id); |
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344 | } |
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345 | |
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346 | /****************************************************************/ |
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347 | /** |
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348 | * Default private key filename. Value must be freed by caller. |
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349 | */ |
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350 | char *abac_id_privkey_filename(abac_id_t *id) { |
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351 | assert(id != NULL); |
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352 | assert(id->cn != NULL); |
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353 | |
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354 | /* this cn has pCN attached to it */ |
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355 | char *filename = NULL; |
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356 | char* ptr=id->cn; |
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357 | asprintf(&filename, "%s%s",(ptr+1),KEY_SUFFIX); |
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358 | return filename; |
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359 | } |
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360 | |
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361 | /** |
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362 | * Get the default filename for the cert. Value must be freed by caller. |
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363 | */ |
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364 | char *abac_id_cert_filename(abac_id_t *id) { |
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365 | assert(id != NULL); |
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366 | assert(id->cn != NULL); |
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367 | |
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368 | /* this cn has pCN attached to it */ |
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369 | char *filename = NULL; |
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370 | char* ptr=id->cn; |
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371 | asprintf(&filename, "%s%s",(ptr+1),CERT_SUFFIX); |
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372 | return filename; |
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373 | } |
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374 | |
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375 | /****************************************************************/ |
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376 | abac_id_t *abac_id_new(int idtype,char *keyid, char *cn, |
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377 | certificate_t *cert) |
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378 | { |
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379 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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380 | id->idtype = idtype; |
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381 | id->keyid = abac_xstrdup(keyid); |
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382 | id->cn = abac_xstrdup(cn); |
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383 | id->cert = cert; |
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384 | id->key = NULL; |
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385 | id->refcount = 1; |
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386 | if(debug) fprintf(stderr,"abac_id_new: made a new id, %ld\n",(long) id); |
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387 | return id; |
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388 | } |
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389 | |
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390 | abac_id_t *abac_id_keyid_new(char *keyid, char *cn, certificate_t *cert) |
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391 | { |
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392 | return abac_id_new(e_KEYID,keyid,cn,cert); |
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393 | } |
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394 | |
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395 | static abac_id_t *_abac_id_from_cert(certificate_t *cert) { |
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396 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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397 | id->idtype = e_KEYID; |
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398 | id->keyid = NULL; |
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399 | id->cn = NULL; |
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400 | id->cert = cert; |
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401 | id->key = NULL; |
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402 | |
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403 | id->keyid = _get_keyid(id->cert); |
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404 | |
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405 | // get the CN from the cert |
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406 | id_part_t type; |
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407 | chunk_t data; |
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408 | |
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409 | identification_t *cert_id = id->cert->get_subject(id->cert); |
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410 | enumerator_t *id_enum = cert_id->create_part_enumerator(cert_id); |
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411 | while (id_enum->enumerate(id_enum, &type, &data)) |
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412 | if (type == ID_PART_RDN_CN) { |
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413 | id->cn = abac_xmalloc(data.len + 1); |
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414 | memcpy(id->cn, data.ptr, data.len); |
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415 | id->cn[data.len] = 0; |
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416 | } |
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417 | id_enum->destroy(id_enum); |
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418 | |
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419 | id->refcount = 1; |
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420 | |
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421 | return id; |
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422 | } |
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423 | |
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424 | /** |
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425 | * Load an ID cert from a file. |
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426 | * this one does not add id into id hash list |
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427 | */ |
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428 | abac_id_t *abac_id_from_file(char *filename) { |
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429 | |
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430 | /* make sure file exists */ |
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431 | if(!file_exist(filename)) return NULL; |
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432 | |
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433 | libabac_init(); |
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434 | certificate_t *cert = lib->creds->create(lib->creds, |
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435 | CRED_CERTIFICATE, CERT_X509, |
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436 | BUILD_FROM_FILE, filename, |
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437 | BUILD_X509_FLAG, X509_AA, |
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438 | BUILD_END |
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439 | ); |
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440 | |
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441 | if (cert == NULL) |
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442 | return NULL; |
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443 | |
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444 | return _abac_id_from_cert(cert); |
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445 | } |
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446 | |
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447 | /** |
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448 | * Load an ID cert from a chunk. |
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449 | */ |
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450 | abac_id_t *abac_id_from_chunk(abac_chunk_t achunk) { |
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451 | chunk_t chunk = { .ptr = achunk.ptr, .len = achunk.len }; |
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452 | |
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453 | certificate_t *cert = lib->creds->create(lib->creds, |
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454 | CRED_CERTIFICATE, CERT_X509, |
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455 | BUILD_BLOB_ASN1_DER, chunk, |
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456 | BUILD_X509_FLAG, X509_AA, |
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457 | BUILD_END |
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458 | ); |
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459 | |
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460 | if (cert == NULL) |
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461 | return NULL; |
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462 | |
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463 | return _abac_id_from_cert(cert); |
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464 | } |
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465 | |
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466 | /** |
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467 | * Generate an ID with the specified CN and validity. |
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468 | * |
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469 | * validity is measured in seconds (as of 0.2.0) |
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470 | */ |
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471 | int abac_id_generate(abac_id_t **ret, char *cn, int validity) |
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472 | { |
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473 | if (cn == NULL || !abac_validate_clean_name(cn)) |
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474 | return ABAC_ID_GENERATE_INVALID_CN; |
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475 | |
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476 | if(debug) fprintf(stderr,"abac_id_generate: generating id with cn(%s)\n",cn); |
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477 | |
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478 | if (validity < 0) |
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479 | return ABAC_ID_GENERATE_INVALID_VALIDITY; |
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480 | |
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481 | if (validity == 0) validity = 1080 * 86400; |
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482 | |
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483 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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484 | |
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485 | char *tmp=NULL; |
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486 | asprintf(&tmp,"p%s",cn); |
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487 | id->idtype = e_KEYID; |
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488 | id->cn = tmp; |
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489 | id->key = abac_key_generate(); |
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490 | id->cert = _generate_cert(id->key, cn, validity); |
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491 | id->keyid = _get_keyid(id->cert); |
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492 | |
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493 | id->refcount = 1; |
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494 | |
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495 | *ret = id; |
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496 | return ABAC_ID_SUCCESS; |
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497 | } |
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498 | |
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499 | |
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500 | /** |
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501 | * Generate an ID with the specified CN and validity and a passphrase. |
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502 | * |
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503 | * validity is measured in seconds (as of 0.2.0) |
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504 | */ |
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505 | int abac_id_generate_with_key(abac_id_t **ret, char *cn, int validity, char *filename, char *pfile) { |
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506 | if (cn == NULL || !abac_validate_clean_name(cn)) |
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507 | return ABAC_ID_GENERATE_INVALID_CN; |
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508 | |
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509 | if(debug) { |
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510 | fprintf(stderr,"abac_id_generate: generating id with cn(%s) and privkey(%s)", |
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511 | cn, filename); |
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512 | if(pfile) fprintf(stderr,"pfile(%s)\n",pfile); |
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513 | else fprintf(stderr,"\n"); |
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514 | } |
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515 | |
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516 | if (validity < 0) |
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517 | return ABAC_ID_GENERATE_INVALID_VALIDITY; |
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518 | |
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519 | if (validity == 0) validity = 1080 * 86400; |
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520 | |
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521 | chunk_t pp=chunk_empty; |
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522 | if(pfile && strlen(pfile)!=0) { |
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523 | if(!file_exist(pfile)) |
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524 | errx(1, "passphrase file does not exist!!\n"); |
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525 | pp=extract_potato(filename,pfile); |
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526 | } |
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527 | |
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528 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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529 | char *tmp=NULL; |
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530 | asprintf(&tmp,"p%s",cn); |
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531 | id->idtype = e_KEYID; |
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532 | id->cn = tmp; |
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533 | id->key = abac_key_file_new(filename,pp); |
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534 | id->cert = _generate_cert(id->key, cn, validity); |
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535 | id->keyid = _get_keyid(id->cert); |
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536 | |
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537 | id->refcount = 1; |
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538 | |
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539 | *ret = id; |
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540 | return ABAC_ID_SUCCESS; |
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541 | } |
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542 | |
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543 | int abac_id_load_privkey_file(abac_id_t *ptr, char *keyfile) |
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544 | { |
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545 | assert(ptr); |
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546 | ptr->key=abac_key_file_new(keyfile, chunk_empty); |
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547 | return 1; |
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548 | } |
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549 | |
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550 | int abac_id_load_enc_privkey_file(abac_id_t *ptr, char *keyfile, char *pfile) |
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551 | { |
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552 | assert(ptr); |
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553 | chunk_t pp=extract_potato(keyfile,pfile); |
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554 | ptr->key=abac_key_file_new(keyfile, pp); |
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555 | return 1; |
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556 | } |
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557 | |
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558 | int abac_id_load_privkey_chunk(abac_id_t *ptr, chunk_t keychunk) |
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559 | { |
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560 | assert(ptr); |
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561 | ptr->key=abac_key_chunk_new(keychunk, chunk_empty); |
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562 | if(debug) |
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563 | print_abac_key("after abac_id_load_privkey_chunk", ptr->key); |
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564 | return 1; |
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565 | } |
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566 | |
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567 | int abac_id_load_enc_privkey_chunk(abac_id_t *ptr, chunk_t keychunk, char *pfile) |
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568 | { |
---|
569 | assert(ptr); |
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570 | chunk_t pp=extract_potato(NULL,pfile); |
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571 | ptr->key=abac_key_chunk_new(keychunk, pp); |
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572 | return 1; |
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573 | } |
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574 | |
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