1 | |
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2 | /* abac_id.c */ |
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3 | |
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4 | // include the GNU extension of asprintf |
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5 | #define _GNU_SOURCE |
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6 | #include <stdio.h> |
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7 | #include <string.h> |
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8 | |
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9 | #include <assert.h> |
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10 | #include <err.h> |
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11 | #include <time.h> |
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12 | |
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13 | #include "libabac_common.h" |
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14 | #include "abac_util.h" |
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15 | #include "abac_openssl.h" |
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16 | |
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17 | #define KEY_SUFFIX "_private.pem" |
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18 | #define CERT_SUFFIX "_ID.pem" |
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19 | |
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20 | static int debug=0; |
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21 | |
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22 | // ID object |
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23 | // |
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24 | struct _abac_id_t { |
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25 | char *keyid; |
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26 | char *cn; |
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27 | X509 *cert; |
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28 | EVP_PKEY *key; |
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29 | |
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30 | int refcount; |
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31 | }; |
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32 | |
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33 | /**************************************************************/ |
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34 | /** |
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35 | * Helper function for building a ID from a cert. Used by |
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36 | * abac_id_from_* |
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37 | */ |
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38 | abac_id_t *_id_from_cert(X509 *cert) { |
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39 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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40 | id->keyid = NULL; |
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41 | id->cn = NULL; |
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42 | id->cert = cert; |
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43 | id->key = NULL; |
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44 | |
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45 | id->keyid = abac_get_keyid(id->cert); |
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46 | id->cn = abac_get_cn(cert); |
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47 | |
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48 | id->refcount = 1; |
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49 | |
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50 | return id; |
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51 | } |
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52 | |
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53 | /** |
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54 | * Load an ID cert from a file. |
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55 | */ |
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56 | abac_id_t *abac_id_from_file(char *filename) { |
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57 | |
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58 | FILE *fp=fopen(filename,"r"); |
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59 | if(fp==NULL) |
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60 | return NULL; |
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61 | |
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62 | X509 *cert = abac_load_id_from_fp(fp); |
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63 | fclose(fp); |
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64 | |
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65 | if (cert == NULL) |
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66 | return NULL; |
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67 | |
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68 | return _id_from_cert(cert); |
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69 | } |
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70 | |
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71 | /* for some reason, there might be beginning and trailing spaces |
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72 | in pem, zap the end with \0 and skip the spaces at the start*/ |
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73 | char *zap_spaces(char *string) |
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74 | { |
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75 | int space=0; |
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76 | int total=strlen(string); |
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77 | int i=0; |
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78 | char *ptr=string; |
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79 | while(string[i]==' ' && i<total) { |
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80 | i++; |
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81 | ptr++; |
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82 | } |
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83 | for(;i<total; i++) { |
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84 | if(string[i]==' ') { |
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85 | space++; |
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86 | string[i]='\0'; |
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87 | } |
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88 | } |
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89 | return ptr; |
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90 | } |
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91 | |
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92 | /* return a void ptr to the x509 structure made from the |
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93 | naked pem structure */ |
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94 | void *abac_get_sha_from_nake_pem(char *npem, char **sha1) { |
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95 | abac_chunk_t chunk; |
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96 | char *start="-----BEGIN CERTIFICATE-----"; |
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97 | char *end="-----END CERTIFICATE-----"; |
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98 | char *pem=NULL; |
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99 | char *ptr=zap_spaces(npem); |
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100 | asprintf(&pem,"%s%s%s",start,ptr,end); |
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101 | chunk.ptr=(unsigned char *)pem; |
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102 | chunk.len=strlen(pem); |
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103 | X509 *cert=abac_load_id_from_chunk(chunk.ptr,chunk.len); |
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104 | *sha1=NULL; |
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105 | if(cert) { |
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106 | *sha1 = abac_xstrdup(abac_get_keyid(cert)); |
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107 | if(debug) fprintf(stderr,"sha1 found is %s\n", *sha1); |
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108 | } else { |
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109 | *sha1=NULL; |
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110 | fprintf(stderr,"can not make cert from pem blob!!\n"); |
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111 | } |
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112 | return (void *) cert; |
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113 | } |
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114 | |
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115 | /** |
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116 | * Load an ID cert from a chunk. |
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117 | */ |
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118 | abac_id_t *abac_id_from_chunk(abac_chunk_t chunk) { |
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119 | |
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120 | X509 *cert= abac_load_id_from_chunk(chunk.ptr, chunk.len); |
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121 | |
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122 | if (cert == NULL) |
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123 | return NULL; |
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124 | |
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125 | return _id_from_cert(cert); |
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126 | } |
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127 | |
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128 | static EVP_PKEY *_load_privkey_from_file(char *filename) |
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129 | { |
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130 | FILE *fp=fopen(filename,"r"); |
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131 | if(fp==NULL) return NULL; |
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132 | EVP_PKEY *key=abac_load_privkey_from_fp(fp); |
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133 | fclose(fp); |
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134 | return key; |
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135 | } |
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136 | |
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137 | /** |
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138 | * Load private key for a cert. |
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139 | */ |
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140 | int abac_id_privkey_from_file(abac_id_t *id, char *filename) { |
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141 | assert(id != NULL); |
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142 | |
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143 | EVP_PKEY *key=_load_privkey_from_file(filename); |
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144 | if (key == NULL) return ABAC_FAILURE; |
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145 | |
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146 | /* needs to make sure that the key matches up with the id */ |
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147 | /* extract the pub key from the id */ |
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148 | EVP_PKEY *pubkey=extract_pubkey_from_cert(id->cert); |
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149 | /* cmp will just compare the pub key part of the key to see |
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150 | if they are the same */ |
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151 | if(!EVP_PKEY_cmp(pubkey, key)) { |
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152 | fprintf(stderr,"wrong private key for the cert!!\n"); |
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153 | return ABAC_FAILURE; |
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154 | } |
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155 | |
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156 | id->key = key; |
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157 | return ABAC_SUCCESS; |
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158 | } |
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159 | |
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160 | /** |
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161 | * Generate an ID with the specified CN and validity. |
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162 | * |
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163 | * validity is measured in seconds (as of 0.2.0) |
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164 | */ |
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165 | int abac_id_generate(abac_id_t **ret, char *cn, long validity) { |
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166 | if (cn == NULL || !abac_clean_name(cn)) |
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167 | return ABAC_GENERATE_INVALID_CN; |
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168 | |
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169 | if (validity < 0) |
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170 | return ABAC_GENERATE_INVALID_VALIDITY; |
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171 | |
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172 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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173 | |
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174 | id->cn = abac_xstrdup(cn); |
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175 | id->key = abac_generate_key(); |
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176 | id->cert = abac_generate_cert(id->key, cn, validity); |
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177 | id->keyid = abac_get_keyid(id->cert); |
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178 | |
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179 | id->refcount = 1; |
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180 | |
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181 | *ret = id; |
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182 | return ABAC_SUCCESS; |
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183 | } |
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184 | |
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185 | /** |
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186 | * Generate an ID with the specified CN and validity. |
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187 | * |
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188 | * validity is measured in seconds (as of 0.2.0) |
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189 | */ |
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190 | int abac_id_generate_with_key(abac_id_t **ret, char *cn, long validity, char *keyfile) { |
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191 | if (cn == NULL || !abac_clean_name(cn)) |
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192 | return ABAC_GENERATE_INVALID_CN; |
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193 | |
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194 | if (validity < 0) |
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195 | return ABAC_GENERATE_INVALID_VALIDITY; |
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196 | |
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197 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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198 | |
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199 | id->cn = abac_xstrdup(cn); |
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200 | id->key = _load_privkey_from_file(keyfile); |
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201 | id->cert = abac_generate_cert(id->key, cn, validity); |
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202 | id->keyid = abac_get_keyid(id->cert); |
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203 | id->refcount = 1; |
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204 | |
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205 | *ret = id; |
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206 | return ABAC_SUCCESS; |
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207 | } |
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208 | |
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209 | char *abac_id_keyid(abac_id_t *id) { |
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210 | if(id) return id->keyid; |
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211 | return NULL; |
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212 | } |
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213 | |
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214 | /** |
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215 | * Get the issuer of an ID cert. |
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216 | * Returns a malloc'd string that must be free'd. |
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217 | */ |
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218 | char *abac_id_issuer(abac_id_t *id) { |
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219 | if(id) return abac_get_issuer(id->cert); |
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220 | else return NULL; |
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221 | } |
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222 | |
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223 | /** |
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224 | * Gets the subject DN of an ID cert. |
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225 | * Returns a malloc'd string that must be free'd. |
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226 | */ |
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227 | char *abac_id_subject(abac_id_t *id) { |
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228 | if(id) return abac_get_subject(id->cert); |
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229 | else return NULL; |
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230 | } |
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231 | |
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232 | /** |
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233 | * Get the validity period. |
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234 | */ |
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235 | int abac_id_validity(abac_id_t *id,struct tm *not_before,struct tm *not_after) { |
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236 | assert(id); |
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237 | if(abac_check_validity(id->cert, not_before, not_after)==0) |
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238 | return ABAC_SUCCESS; |
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239 | return ABAC_FAILURE; |
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240 | } |
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241 | |
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242 | X509 *abac_id_cert(abac_id_t *id) { |
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243 | assert(id); |
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244 | return id->cert; |
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245 | } |
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246 | |
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247 | // get the private key from the ID |
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248 | // will return NULL if no key has been loaded |
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249 | EVP_PKEY *abac_id_privkey(abac_id_t *id) { |
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250 | assert(id); |
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251 | return id->key; |
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252 | } |
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253 | |
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254 | int abac_id_has_privkey(abac_id_t *id) { |
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255 | if(id && (id->key !=NULL)) |
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256 | return 1; |
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257 | return 0; |
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258 | } |
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259 | |
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260 | // see if keyid is the same as id's |
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261 | int abac_id_has_keyid(abac_id_t *id, char *keyid) |
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262 | { |
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263 | assert(id); assert(keyid); |
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264 | if(strcmp(id->keyid, keyid) == 0) |
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265 | return 1; |
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266 | return 0; |
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267 | } |
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268 | |
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269 | /* |
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270 | return a chunk with both id and key info, |
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271 | err if missing privkey |
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272 | */ |
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273 | int abac_id_PEM(abac_id_t *id, abac_chunk_t *chunk) { |
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274 | if(id==NULL) |
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275 | return ABAC_CERT_MISSING_ISSUER; |
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276 | if(id->key == NULL) |
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277 | return ABAC_CERT_SIGNER_NOKEY; |
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278 | |
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279 | unsigned char *kptr=NULL; |
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280 | unsigned char *ptr=abac_string_cert(id->cert); |
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281 | if(id->key) |
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282 | kptr=abac_string_privkey(id->key); |
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283 | int len=0; |
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284 | |
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285 | char *tmp=NULL; |
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286 | if(kptr) { |
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287 | asprintf(&tmp,"%s%s", ptr,kptr); |
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288 | free(ptr); |
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289 | free(kptr); |
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290 | } else { |
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291 | tmp=(char *)ptr; |
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292 | } |
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293 | len=strlen(tmp); |
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294 | |
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295 | chunk->ptr=(unsigned char *)tmp; |
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296 | chunk->len=len; |
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297 | return ABAC_CERT_SUCCESS; |
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298 | } |
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299 | |
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300 | abac_chunk_t abac_id_in_PEM(abac_id_t *id) { |
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301 | assert(id); |
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302 | unsigned char *ptr=abac_string_cert(id->cert); |
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303 | int len=0; |
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304 | if(ptr) |
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305 | len=strlen((char *)ptr); |
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306 | abac_chunk_t ret = {ptr, len }; |
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307 | return ret; |
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308 | } |
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309 | |
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310 | |
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311 | int abac_id_still_valid(abac_id_t *id) { |
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312 | assert(id); |
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313 | return abac_still_valid(id->cert); |
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314 | } |
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315 | |
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316 | /** |
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317 | * Get the default filename for the cert. Value must be freed by caller. |
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318 | */ |
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319 | char *abac_id_cert_filename(abac_id_t *id) { |
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320 | assert(id != NULL); |
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321 | assert(id->cn != NULL); |
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322 | |
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323 | // malloc the filename |
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324 | int len = strlen(id->cn) + strlen(CERT_SUFFIX) + 1; |
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325 | char *filename = abac_xmalloc(len); |
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326 | sprintf(filename, "%s" CERT_SUFFIX, id->cn); |
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327 | |
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328 | return filename; |
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329 | } |
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330 | |
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331 | /** |
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332 | * Write the ID cert to an open file pointer. |
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333 | * pem format |
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334 | */ |
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335 | int abac_id_write_cert(abac_id_t *id, FILE *out) { |
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336 | assert(id != NULL); |
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337 | |
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338 | int ret=abac_write_id_to_fp(id->cert, out); |
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339 | if(ret) return ABAC_FAILURE; |
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340 | return ABAC_SUCCESS; |
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341 | } |
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342 | |
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343 | /** |
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344 | * Default private key filename. Value must be freed by caller. |
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345 | */ |
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346 | char *abac_id_privkey_filename(abac_id_t *id) { |
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347 | assert(id != NULL); |
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348 | assert(id->cn != NULL); |
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349 | |
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350 | // malloc the filename |
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351 | int len = strlen(id->cn) + strlen(KEY_SUFFIX) + 1; |
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352 | char *filename = abac_xmalloc(len); |
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353 | sprintf(filename, "%s" KEY_SUFFIX, id->cn); |
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354 | |
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355 | return filename; |
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356 | } |
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357 | |
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358 | /** |
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359 | * Write the private key to a file. |
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360 | * Returns false if there's no private key loaded |
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361 | * PEM format |
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362 | */ |
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363 | int abac_id_write_privkey(abac_id_t *id, FILE *out) { |
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364 | assert(id != NULL); |
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365 | if (id->key == NULL) |
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366 | return ABAC_FAILURE; |
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367 | |
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368 | int ret=abac_write_privkey_to_fp(id->key, out); |
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369 | if (ret) |
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370 | return ABAC_FAILURE; |
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371 | |
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372 | return ABAC_SUCCESS; |
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373 | } |
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374 | |
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375 | /** |
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376 | * Get a abac_chunk representing the id cert. |
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377 | */ |
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378 | abac_chunk_t abac_id_cert_chunk(abac_id_t *id) { |
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379 | |
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380 | assert(id); assert(id->cert); |
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381 | unsigned char *ptr=abac_string_cert(id->cert); |
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382 | int len=0; |
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383 | if(ptr) len=strlen( (char *)ptr); |
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384 | |
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385 | abac_chunk_t ret = { ptr, len }; |
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386 | return ret; |
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387 | } |
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388 | |
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389 | /** |
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390 | * Get a abac_chunk representing the privkey cert. |
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391 | */ |
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392 | abac_chunk_t abac_id_privkey_chunk(abac_id_t *id) { |
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393 | |
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394 | assert(id); assert(id->key); |
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395 | unsigned char *ptr=abac_string_privkey(id->key); |
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396 | int len=0; |
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397 | if(ptr) len=strlen( (char *)ptr); |
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398 | |
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399 | abac_chunk_t ret = { ptr, len }; |
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400 | return ret; |
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401 | } |
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402 | |
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403 | |
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404 | /** |
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405 | * Copy a ID. Actually just increases its reference count. |
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406 | */ |
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407 | abac_id_t *abac_id_dup(abac_id_t *id) { |
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408 | assert(id); |
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409 | ++id->refcount; |
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410 | return id; |
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411 | } |
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412 | |
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413 | void abac_id_free(abac_id_t *id) { |
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414 | if (id == NULL) |
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415 | return; |
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416 | |
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417 | --id->refcount; |
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418 | if (id->refcount > 0) |
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419 | return; |
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420 | |
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421 | // free once the reference count reaches 0 |
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422 | X509_free(id->cert); |
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423 | EVP_PKEY_free(id->key); |
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424 | |
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425 | free(id->keyid); |
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426 | free(id); |
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427 | } |
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428 | |
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