1 | /* abac.c */ |
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2 | |
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3 | #include <assert.h> |
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4 | #include <err.h> |
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5 | #include <glob.h> |
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6 | |
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7 | #include "abac.h" |
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8 | #include "abac_list.h" |
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9 | #include "abac_graph.h" |
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10 | #include "abac_util.h" |
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11 | #include "abac_verifier.h" |
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12 | |
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13 | struct _abac_context_t { |
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14 | abac_graph_t *graph; |
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15 | }; |
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16 | |
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17 | /** |
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18 | * Init the library. |
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19 | */ |
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20 | void libabac_init(void) { |
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21 | void libabac_deinit(void); |
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22 | static int has_been_init = 0; |
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23 | |
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24 | // called every time a context is created, so only do it once |
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25 | if (!has_been_init) { |
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26 | abac_verifier_init(); |
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27 | atexit(libabac_deinit); |
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28 | has_been_init = 1; |
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29 | } |
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30 | } |
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31 | |
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32 | /** |
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33 | * Deinit the library. |
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34 | */ |
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35 | void libabac_deinit(void) { |
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36 | abac_verifier_deinit(); |
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37 | } |
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38 | |
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39 | /** |
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40 | * Create a new abac context. |
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41 | */ |
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42 | abac_context_t *abac_context_new(void) { |
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43 | libabac_init(); |
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44 | |
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45 | abac_context_t *ctx = abac_xmalloc(sizeof(abac_context_t)); |
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46 | ctx->graph = abac_graph_new(); |
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47 | return ctx; |
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48 | } |
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49 | |
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50 | /** |
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51 | * Deep copy an abac context. |
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52 | */ |
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53 | abac_context_t *abac_context_dup(abac_context_t *ctx) { |
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54 | assert(ctx != NULL); |
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55 | |
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56 | abac_context_t *dup = abac_xmalloc(sizeof(abac_context_t)); |
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57 | dup->graph = abac_graph_dup(ctx->graph); |
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58 | |
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59 | return dup; |
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60 | } |
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61 | |
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62 | /** |
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63 | * Free an abac context. |
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64 | */ |
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65 | void abac_context_free(abac_context_t *ctx) { |
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66 | assert(ctx != NULL); |
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67 | |
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68 | abac_graph_free(ctx->graph); |
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69 | free(ctx); |
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70 | } |
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71 | |
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72 | /** |
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73 | * Load an ID cert from a file. |
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74 | */ |
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75 | int abac_context_load_id_file(abac_context_t *ctx, char *filename) { |
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76 | assert(ctx != NULL); assert(filename != NULL); |
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77 | return abac_verifier_load_id_file(filename); |
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78 | } |
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79 | |
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80 | /** |
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81 | * Load an ID cert from a chunk. |
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82 | */ |
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83 | int abac_context_load_id_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) { |
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84 | assert(ctx != NULL); |
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85 | return abac_verifier_load_id_chunk(cert_chunk); |
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86 | } |
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87 | |
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88 | /** |
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89 | * Load an attribute cert from a file. |
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90 | */ |
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91 | int abac_context_load_attribute_file(abac_context_t *ctx, char *filename) { |
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92 | int ret, add_ret; |
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93 | abac_list_t *cred_list=abac_list_new(); // could be more than 1 |
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94 | abac_credential_t *cred; |
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95 | |
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96 | assert(ctx != NULL); assert(filename != NULL); |
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97 | |
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98 | ret = abac_verifier_load_attribute_cert_file(filename, cred_list); |
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99 | |
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100 | if (ret == ABAC_CERT_SUCCESS) { |
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101 | int size = abac_list_size(cred_list); |
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102 | if(size) { |
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103 | abac_list_foreach(cred_list, cred, |
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104 | add_ret = abac_graph_add_credential(ctx->graph, cred); |
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105 | assert(add_ret != ABAC_GRAPH_CRED_INVALID); |
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106 | abac_credential_free(cred); |
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107 | ); |
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108 | abac_list_free(cred_list); |
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109 | } |
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110 | } |
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111 | return ret; |
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112 | } |
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113 | |
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114 | /** |
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115 | * Load an attribute cert from a chunk. |
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116 | */ |
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117 | int abac_context_load_attribute_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) { |
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118 | int ret, add_ret; |
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119 | abac_list_t *cred_list=abac_list_new(); // could be more than 1 |
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120 | abac_credential_t *cred; |
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121 | |
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122 | assert(ctx != NULL); |
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123 | |
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124 | ret = abac_verifier_load_attribute_cert_chunk(cert_chunk, cred_list); |
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125 | if (ret == ABAC_CERT_SUCCESS) { |
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126 | int size = abac_list_size(cred_list); |
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127 | if(size) { |
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128 | abac_list_foreach(cred_list, cred, |
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129 | add_ret = abac_graph_add_credential(ctx->graph, cred); |
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130 | assert(add_ret != ABAC_GRAPH_CRED_INVALID); |
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131 | abac_credential_free(cred); |
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132 | ); |
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133 | abac_list_free(cred_list); |
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134 | } |
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135 | } |
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136 | |
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137 | return ret; |
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138 | } |
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139 | |
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140 | #define ID_PAT "/*_ID.{der,pem}" |
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141 | #define ATTR_PAT "/*_attr.xml" |
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142 | |
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143 | /** |
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144 | * Load a directory full of certs. |
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145 | */ |
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146 | void abac_context_load_directory(abac_context_t *ctx, char *path) { |
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147 | char *glob_pat; |
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148 | glob_t glob_buf; |
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149 | int i, ret; |
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150 | |
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151 | assert(ctx != NULL); assert(path != NULL); |
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152 | |
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153 | int dirlen = strlen(path); |
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154 | glob_pat = abac_xmalloc(dirlen + sizeof(ID_PAT)); |
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155 | memcpy(glob_pat, path, dirlen); |
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156 | |
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157 | // first load ID certs |
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158 | memcpy(glob_pat + dirlen, ID_PAT, sizeof(ID_PAT)); |
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159 | glob(glob_pat, GLOB_BRACE, NULL, &glob_buf); // TODO check for error |
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160 | for (i = 0; i < glob_buf.gl_pathc; ++i) { |
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161 | char *cert_file = glob_buf.gl_pathv[i]; |
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162 | |
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163 | ret = abac_context_load_id_file(ctx, cert_file); |
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164 | if (ret != ABAC_CERT_SUCCESS) |
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165 | warnx("Couldn't load ID cert %s", cert_file); |
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166 | } |
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167 | globfree(&glob_buf); |
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168 | |
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169 | // then load attr certs |
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170 | memcpy(glob_pat + dirlen, ATTR_PAT, sizeof(ATTR_PAT)); |
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171 | glob(glob_pat, 0, NULL, &glob_buf); // TODO check for error |
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172 | for (i = 0; i < glob_buf.gl_pathc; ++i) { |
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173 | char *cert_file = glob_buf.gl_pathv[i]; |
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174 | |
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175 | ret = abac_context_load_attribute_file(ctx, cert_file); |
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176 | if (ret != ABAC_CERT_SUCCESS) |
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177 | warnx("Couldn't load attribute cert %s", cert_file); |
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178 | } |
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179 | globfree(&glob_buf); |
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180 | |
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181 | free(glob_pat); |
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182 | } |
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183 | |
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184 | /** |
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185 | * Run a query on the data in an abac context. Returns a NULL-terminated array |
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186 | * of abac_credential_t. Success/failure in *success. |
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187 | */ |
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188 | abac_credential_t **abac_context_query(abac_context_t *ctx, char *role, char *principal, int *success) { |
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189 | abac_credential_t **credentials = NULL, *cur; |
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190 | int i = 0; |
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191 | |
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192 | assert(ctx != NULL); assert(role != NULL); assert(principal != NULL); assert(success != NULL); |
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193 | |
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194 | abac_graph_t *result_graph = abac_graph_query(ctx->graph, role, principal); |
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195 | abac_list_t *result = abac_graph_credentials(result_graph); |
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196 | |
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197 | abac_graph_free(result_graph); |
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198 | |
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199 | int size = abac_list_size(result); |
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200 | if (size > 0) |
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201 | *success = 1; |
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202 | |
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203 | // if there is no actual path, return everything that can reach the role |
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204 | else { |
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205 | *success = 0; |
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206 | abac_list_free(result); |
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207 | result_graph = abac_graph_new(); |
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208 | |
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209 | // TODO: This can probably be better, but it now returns an |
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210 | // approximation of a partial proof. It returns all the attributes the |
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211 | // principal can reach and all the attributes that will lead to a |
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212 | // success. |
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213 | |
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214 | /* Get all the attributes of the principal. This calls sub-queries to |
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215 | * flesh out the indirect proofs. */ |
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216 | result_graph = abac_graph_principal_creds(ctx->graph, principal); |
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217 | |
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218 | /* This gets all the attributes linked to the target en route to the |
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219 | * principal. */ |
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220 | result = abac_graph_postorder_credentials(ctx->graph, role); |
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221 | |
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222 | /* Merge responses */ |
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223 | abac_list_foreach(result, cur, |
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224 | abac_graph_add_credential(result_graph, cur); |
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225 | ); |
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226 | abac_list_free(result); |
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227 | abac_graph_derive_links(result_graph); |
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228 | |
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229 | result = abac_graph_credentials(result_graph); |
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230 | abac_graph_free(result_graph); |
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231 | |
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232 | size = abac_list_size(result); |
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233 | } |
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234 | |
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235 | // make the array (leave space to NULL terminate it) |
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236 | // n.b., even if the list is empty, we still return an array that |
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237 | // only contains the NULL terminator |
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238 | credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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239 | abac_list_foreach(result, cur, |
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240 | credentials[i++] = cur; |
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241 | ); |
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242 | credentials[i] = NULL; |
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243 | |
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244 | abac_list_free(result); |
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245 | |
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246 | return credentials; |
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247 | } |
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248 | |
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249 | /** |
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250 | * A NULL-terminated array of all the credentials in the context. |
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251 | */ |
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252 | abac_credential_t **abac_context_credentials(abac_context_t *ctx) { |
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253 | abac_credential_t *cred; |
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254 | int i = 0; |
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255 | |
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256 | assert(ctx != NULL); |
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257 | |
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258 | abac_list_t *cred_list = abac_graph_credentials(ctx->graph); |
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259 | int size = abac_list_size(cred_list); |
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260 | |
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261 | abac_credential_t **credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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262 | abac_list_foreach(cred_list, cred, |
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263 | credentials[i++] = cred; |
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264 | ); |
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265 | credentials[i] = NULL; |
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266 | |
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267 | abac_list_free(cred_list); |
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268 | |
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269 | return credentials; |
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270 | } |
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271 | |
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272 | /** |
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273 | * Frees a NULL-terminated list of credentials. |
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274 | */ |
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275 | void abac_context_credentials_free(abac_credential_t **credentials) { |
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276 | int i; |
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277 | |
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278 | if (credentials == NULL) |
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279 | return; |
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280 | |
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281 | for (i = 0; credentials[i] != NULL; ++i) |
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282 | abac_credential_free(credentials[i]); |
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283 | free(credentials); |
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284 | } |
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