1 | #define GNU_SOURCE |
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2 | #include <credentials/keys/private_key.h> |
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3 | |
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4 | #include "creddy.h" |
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5 | #include "id.h" |
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6 | |
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7 | #include <termios.h> |
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8 | |
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9 | #define ROLE_SEPARATOR " <- " |
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10 | #define INTERSECTION_SEP " & " |
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11 | #define SHA1_LENGTH 40 |
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12 | |
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13 | void attribute_main(options_t *opts) { |
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14 | int i, ret, role_len = 1; |
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15 | |
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16 | if ( |
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17 | opts->issuer == NULL || |
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18 | opts->key == NULL || |
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19 | opts->role == NULL || |
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20 | opts->out == NULL |
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21 | ) |
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22 | usage(opts); |
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23 | |
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24 | if (!clean_name(opts->role)) { |
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25 | printf("bad role name %s\n", opts->role); |
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26 | usage(opts); |
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27 | } |
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28 | |
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29 | role_len += SHA1_LENGTH + 1 + strlen(opts->role); |
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30 | role_len += strlen(ROLE_SEPARATOR); |
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31 | |
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32 | for (i = 0; i < opts->num_subjects; ++i) { |
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33 | subject_t *cur = &opts->subjects[i]; |
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34 | |
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35 | // if we have an ID, make sure it's SHA1 and lowercase |
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36 | if (cur->id) { |
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37 | int j; |
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38 | char *subject_id = cur->id; |
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39 | |
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40 | // hex chars (also convert to lowercase) |
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41 | for (j = 0; subject_id[j]; ++j) { |
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42 | subject_id[j] = tolower(subject_id[j]); |
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43 | if (!isxdigit(subject_id[j])) { |
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44 | printf("Invalid subject ID %s: must be SHA1\n", subject_id); |
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45 | usage(opts); |
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46 | } |
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47 | } |
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48 | |
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49 | // correct length |
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50 | if (j != SHA1_LENGTH) { |
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51 | printf("Invalid subject ID %s: must be SHA1 (wrong length)\n", subject_id); |
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52 | usage(opts); |
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53 | } |
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54 | } |
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55 | |
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56 | // otherwise we have a cert |
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57 | else { |
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58 | creddy_id_t *subject = creddy_id_from_file(cur->cert); |
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59 | if (subject == NULL) |
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60 | errx(1, "Can't load subject cert from %s", cur->cert); |
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61 | cur->id = xstrdup(creddy_id_keyid(subject)); |
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62 | creddy_id_free(subject); |
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63 | } |
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64 | |
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65 | role_len += SHA1_LENGTH; |
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66 | |
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67 | // verify the subject role name if present |
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68 | if (cur->role) { |
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69 | char *role = cur->role; |
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70 | char *start[3]; |
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71 | int name_parts = 0, j; |
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72 | |
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73 | start[name_parts++] = role; |
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74 | |
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75 | for (j = 0; role[j] != '\0'; ++j) |
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76 | if (role[j] == '.') { |
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77 | if (name_parts == 3) { |
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78 | printf("bad subject role name (too many dots)\n"); |
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79 | usage(opts); |
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80 | } |
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81 | start[name_parts++] = &role[j+1]; |
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82 | role[j] = 0; |
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83 | } |
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84 | |
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85 | for (j = 0; j < name_parts; ++j) |
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86 | if (!clean_name(start[j])) { |
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87 | printf("bad subject role name\n"); |
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88 | usage(opts); |
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89 | } |
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90 | |
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91 | for (j = 1; j < name_parts; ++j) |
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92 | *(start[j]-1) = '.'; // replace the dot |
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93 | |
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94 | role_len += strlen(cur->role) + 1; |
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95 | } |
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96 | |
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97 | role_len += sizeof(INTERSECTION_SEP) - 1; |
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98 | } |
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99 | |
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100 | if (opts->validity < 0) { |
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101 | printf("Validity must be >= 1 day\n"); |
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102 | usage(opts); |
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103 | } |
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104 | |
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105 | // issuer |
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106 | creddy_id_t *issuer = creddy_id_from_file(opts->issuer); |
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107 | if (issuer == NULL) |
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108 | errx(1, "Can't load cert from %s", opts->issuer); |
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109 | |
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110 | // private key |
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111 | ret = creddy_id_load_privkey(issuer, opts->key); |
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112 | if (!ret) |
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113 | errx(1, "Can't load private key from %s", opts->key); |
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114 | |
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115 | // get the keyids |
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116 | char *issuer_id = creddy_id_keyid(issuer); |
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117 | |
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118 | // build the role encoding |
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119 | char *role_encoding = xmalloc(role_len); |
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120 | role_encoding[0] = '\0'; |
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121 | |
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122 | // role |
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123 | sprintf(role_encoding, "%s.%s" ROLE_SEPARATOR, issuer_id, opts->role); |
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124 | |
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125 | // subject(s) |
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126 | for (i = 0; i < opts->num_subjects; ++i) { |
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127 | subject_t *cur = &opts->subjects[i]; |
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128 | |
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129 | strcat(role_encoding, cur->id); |
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130 | if (cur->role) { |
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131 | strcat(role_encoding, "."); |
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132 | strcat(role_encoding, cur->role); |
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133 | } |
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134 | |
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135 | if (i < opts->num_subjects - 1) |
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136 | strcat(role_encoding, INTERSECTION_SEP); |
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137 | } |
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138 | |
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139 | // create attribute cert |
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140 | time_t not_before = time(NULL); |
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141 | time_t not_after = not_before + opts->validity * 3600 * 60 * 60; |
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142 | chunk_t serial = generate_serial(); |
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143 | |
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144 | certificate_t *attr_cert = lib->creds->create(lib->creds, |
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145 | CRED_CERTIFICATE, CERT_X509_AC, |
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146 | BUILD_CERT, creddy_id_cert(issuer), |
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147 | BUILD_NOT_BEFORE_TIME, not_before, |
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148 | BUILD_NOT_AFTER_TIME, not_after, |
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149 | BUILD_SERIAL, serial, |
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150 | BUILD_IETF_GROUP_ATTR, role_encoding, |
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151 | BUILD_SIGNING_CERT, creddy_id_cert(issuer), |
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152 | BUILD_SIGNING_KEY, creddy_id_privkey(issuer), |
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153 | BUILD_END |
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154 | ); |
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155 | if (attr_cert == NULL) |
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156 | errx(1, "Couldn't build attribute cert"); |
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157 | |
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158 | // write to file |
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159 | chunk_t encoding = attr_cert->get_encoding(attr_cert); |
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160 | |
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161 | FILE *out = fopen(opts->out, "w"); |
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162 | if (out == NULL) |
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163 | err(1, "Can't open attribute cert output file %s", opts->out); |
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164 | fwrite(encoding.ptr, encoding.len, 1, out); |
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165 | fclose(out); |
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166 | |
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167 | free(role_encoding); |
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168 | free(serial.ptr); |
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169 | DESTROY_IF(attr_cert); |
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170 | free(encoding.ptr); |
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171 | creddy_id_free(issuer); |
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172 | } |
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