1 | #include <credentials/keys/private_key.h> |
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2 | |
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3 | #include "creddy.h" |
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4 | |
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5 | #define ROLE_SEPARATOR " <- " |
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6 | #define SHA1_LENGTH 40 |
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7 | |
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8 | void attribute_main(options_t *opts) { |
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9 | char *subject_id = NULL; |
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10 | |
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11 | if ( |
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12 | opts->issuer == NULL || |
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13 | opts->key == NULL || |
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14 | opts->role == NULL || |
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15 | opts->out == NULL |
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16 | ) |
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17 | usage(opts); |
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18 | |
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19 | // make sure we have exactly one of --subject-cert / --subject-id |
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20 | if (opts->subject_cert == NULL && opts->subject_id == NULL) |
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21 | usage(opts); |
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22 | if (opts->subject_cert && opts->subject_id) { |
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23 | printf("Need exactly one of --subject-cert / --subject-id"); |
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24 | usage(opts); |
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25 | } |
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26 | |
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27 | // if we have an ID, make sure it's SHA1 and lowercase |
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28 | if (opts->subject_id) { |
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29 | int i; |
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30 | subject_id = opts->subject_id; |
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31 | |
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32 | // hex chars (also convert to lowercase) |
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33 | for (i = 0; subject_id[i]; ++i) { |
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34 | subject_id[i] = tolower(subject_id[i]); |
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35 | if (!isxdigit(subject_id[i])) { |
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36 | printf("Invalid subject ID: must be SHA1\n"); |
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37 | usage(opts); |
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38 | } |
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39 | } |
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40 | |
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41 | // correct length |
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42 | if (i != SHA1_LENGTH) { |
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43 | printf("Invalid subject ID: must be SHA1 (too long)\n"); |
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44 | usage(opts); |
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45 | } |
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46 | } |
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47 | |
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48 | if (!clean_name(opts->role)) { |
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49 | printf("bad role name\n"); |
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50 | usage(opts); |
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51 | } |
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52 | |
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53 | // verify the subject role name if present |
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54 | if (opts->subject_role) { |
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55 | char *role = opts->subject_role; |
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56 | char *start[3]; |
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57 | int name_parts = 0, i; |
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58 | |
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59 | start[name_parts++] = role; |
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60 | |
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61 | for (i = 0; role[i] != '\0'; ++i) |
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62 | if (role[i] == '.') { |
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63 | if (name_parts == 3) { |
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64 | printf("bad subject role name (too many dots)\n"); |
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65 | usage(opts); |
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66 | } |
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67 | start[name_parts++] = &role[i+1]; |
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68 | role[i] = 0; |
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69 | } |
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70 | |
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71 | for (i = 0; i < name_parts; ++i) |
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72 | if (!clean_name(start[i])) { |
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73 | printf("bad subject role name\n"); |
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74 | usage(opts); |
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75 | } |
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76 | |
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77 | for (i = 1; i < name_parts; ++i) |
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78 | *(start[i]-1) = '.'; // replace the dot |
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79 | } |
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80 | |
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81 | if (opts->validity < 0) { |
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82 | printf("Validity must be >= 1 day\n"); |
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83 | usage(opts); |
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84 | } |
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85 | |
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86 | // load signer key |
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87 | private_key_t *key = lib->creds->create(lib->creds, |
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88 | CRED_PRIVATE_KEY, KEY_RSA, |
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89 | BUILD_FROM_FILE, opts->key, |
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90 | BUILD_END |
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91 | ); |
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92 | if (key == NULL) |
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93 | errx(1, "can't open private key file %s", opts->key); |
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94 | |
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95 | // get the keyids |
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96 | certificate_t *issuer = cert_from_file(opts->issuer); |
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97 | char *issuer_id = cert_keyid(issuer); |
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98 | |
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99 | // subject keyid from cert if it wasn't passed in |
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100 | if (opts->subject_cert) { |
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101 | certificate_t *subject = cert_from_file(opts->subject_cert); |
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102 | subject_id = cert_keyid(subject); |
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103 | DESTROY_IF(subject); |
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104 | } |
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105 | |
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106 | // build the role encoding |
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107 | int role_encoding_len = 1; // for nul terminator |
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108 | role_encoding_len += strlen(issuer_id) + 1 + strlen(opts->role); |
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109 | role_encoding_len += sizeof(ROLE_SEPARATOR) - 1; |
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110 | role_encoding_len += strlen(subject_id); |
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111 | if (opts->subject_role) |
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112 | role_encoding_len += 1 + strlen(opts->subject_role); |
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113 | |
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114 | char *role_encoding = xmalloc(role_encoding_len); |
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115 | role_encoding[0] = '\0'; |
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116 | |
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117 | sprintf(role_encoding, "%s.%s" ROLE_SEPARATOR "%s", issuer_id, opts->role, subject_id); |
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118 | if (opts->subject_role) { |
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119 | strcat(role_encoding, "."); |
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120 | strcat(role_encoding, opts->subject_role); |
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121 | } |
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122 | |
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123 | free(issuer_id); |
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124 | |
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125 | // if opts->subject_id, the memory will be freed in main |
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126 | if (opts->subject_cert) |
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127 | free(subject_id); |
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128 | |
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129 | // create attribute cert |
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130 | time_t not_before = time(NULL); |
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131 | time_t not_after = not_before + opts->validity * 3600 * 60 * 60; |
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132 | chunk_t serial = generate_serial(); |
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133 | |
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134 | certificate_t *attr_cert = lib->creds->create(lib->creds, |
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135 | CRED_CERTIFICATE, CERT_X509_AC, |
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136 | BUILD_CERT, issuer, |
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137 | BUILD_NOT_BEFORE_TIME, not_before, |
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138 | BUILD_NOT_AFTER_TIME, not_after, |
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139 | BUILD_SERIAL, serial, |
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140 | BUILD_IETF_GROUP_ATTR, role_encoding, |
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141 | BUILD_SIGNING_CERT, issuer, |
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142 | BUILD_SIGNING_KEY, key, |
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143 | BUILD_END |
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144 | ); |
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145 | if (attr_cert == NULL) |
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146 | errx(1, "Couldn't build attribute cert"); |
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147 | |
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148 | // write to file |
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149 | chunk_t encoding = attr_cert->get_encoding(attr_cert); |
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150 | |
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151 | FILE *out = fopen(opts->out, "w"); |
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152 | if (out == NULL) |
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153 | err(1, "Can't open attribute cert output file %s", opts->out); |
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154 | fwrite(encoding.ptr, encoding.len, 1, out); |
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155 | fclose(out); |
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156 | |
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157 | free(role_encoding); |
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158 | free(serial.ptr); |
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159 | DESTROY_IF(attr_cert); |
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160 | DESTROY_IF(issuer); |
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161 | DESTROY_IF(key); |
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162 | } |
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