1 | |
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2 | /** |
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3 | ** abac_attribute.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 <ctype.h> |
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8 | #include <string.h> |
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9 | #include <time.h> |
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10 | |
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11 | #include "abac_internal.h" |
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12 | #include "abac_util.h" |
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13 | #include "abac_rt.h" |
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14 | |
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15 | #define SHA1_LENGTH 40 |
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16 | |
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17 | extern char* abac_encode_string(char*); |
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18 | extern abac_key_t *abac_id_keyptr(abac_id_t *id); |
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19 | extern abac_aspect_t *abac_yy_get_rule_head_aspect(); |
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20 | extern abac_aspect_t *abac_yy_get_rule_tail_aspect(); |
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21 | extern abac_list_t *abac_yy_get_rule_clauses(); |
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22 | extern char* abac_decode_string(char *); |
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23 | extern void abac_yy_free_rule_clauses(); |
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24 | extern int verify_signature(certificate_t *issuer_cert, certificate_t *cert); |
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25 | |
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26 | abac_attribute_t *abac_attribute_set_head(abac_attribute_t *ptr, abac_aspect_t *head); |
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27 | |
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28 | static int debug=0; |
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29 | |
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30 | struct _abac_attribute_t { |
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31 | abac_id_t *issuer_id; |
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32 | abac_aspect_t *head; |
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33 | abac_aspect_t *tail; |
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34 | int validity; |
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35 | certificate_t *cert; // NULL until baked |
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36 | certificate_t *issuer_cert; |
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37 | |
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38 | int refcount; |
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39 | }; |
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40 | |
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41 | /********************************************************************/ |
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42 | char *get_cred_encoding(abac_attribute_t *ptr) |
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43 | { |
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44 | char *encoding=NULL; |
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45 | |
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46 | /* must have a head aspect and tail aspect */ |
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47 | assert(ptr->head != NULL); |
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48 | assert(ptr->tail != NULL); |
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49 | |
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50 | char *head_string=abac_aspect_typed_string_with_condition(ptr->head); |
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51 | char *tail_string=abac_aspect_typed_string_with_condition(ptr->tail); |
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52 | |
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53 | asprintf(&encoding,"%s<-%s", head_string,tail_string); |
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54 | char* base64_encoding=abac_encode_string(encoding); |
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55 | |
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56 | if(debug) fprintf(stderr,"XXX abac_attribute_bake (%s)\n", encoding); |
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57 | |
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58 | free(encoding); |
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59 | free(head_string); |
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60 | free(tail_string); |
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61 | return base64_encoding; |
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62 | } |
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63 | |
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64 | /********************************************************************/ |
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65 | abac_attribute_t *abac_attribute_new(abac_id_t *issuer, certificate_t *cert, |
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66 | certificate_t *issuer_cert) |
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67 | { |
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68 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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69 | ptr->issuer_id = abac_id_dup(issuer); |
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70 | ptr->head = NULL; |
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71 | ptr->tail = NULL; |
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72 | ptr->validity= 365 * 86400; // default |
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73 | ptr->cert=cert; // already baked.. |
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74 | ptr->issuer_cert=issuer_cert; |
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75 | ptr->refcount=1; |
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76 | |
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77 | return ptr; |
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78 | } |
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79 | |
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80 | // validity is measured in seconds (as of 0.2.0) |
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81 | int abac_attribute_create(abac_attribute_t **ret, |
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82 | abac_aspect_t *head, abac_aspect_t *tail, int validity) |
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83 | { |
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84 | abac_id_t *issuer_id=abac_aspect_get_issuer_id(head); |
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85 | if(debug) |
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86 | print_abac_key("abac_attribute_create" , abac_id_keyptr(issuer_id)); |
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87 | |
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88 | char *name=abac_aspect_aspect_name(head); |
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89 | |
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90 | if (!abac_id_has_privkey(issuer_id)) |
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91 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
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92 | if (!abac_validate_clean_aspect_name(name)) |
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93 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
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94 | if (validity < 0) |
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95 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
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96 | |
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97 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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98 | ptr->issuer_id = abac_id_dup(issuer_id); |
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99 | ptr->head = abac_aspect_dup(head); |
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100 | ptr->tail = (tail!=NULL) ? abac_aspect_dup(tail):NULL; |
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101 | ptr->validity=(validity==0?(365 * 86400):validity); |
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102 | |
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103 | // NULL until baked |
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104 | ptr->cert=NULL; |
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105 | ptr->issuer_cert=NULL; |
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106 | ptr->refcount=1; |
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107 | *ret = ptr; |
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108 | return ABAC_ATTRIBUTE_SUCCESS; |
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109 | } |
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110 | |
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111 | // validity is measured in seconds (as of 0.2.0) |
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112 | int abac_attribute_create_creddy(abac_attribute_t **ret, abac_id_t *issuer, |
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113 | abac_aspect_t *head_aspect, abac_aspect_t *tail_aspect, char *name, int validity) |
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114 | { |
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115 | if (!abac_id_has_privkey(issuer)) |
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116 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
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117 | if (!abac_validate_clean_aspect_name(name)) |
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118 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
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119 | if (validity < 0) |
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120 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
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121 | |
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122 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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123 | ptr->issuer_id = abac_id_dup(issuer); |
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124 | |
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125 | ptr->head=head_aspect; |
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126 | ptr->tail=tail_aspect; |
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127 | ptr->validity = validity; |
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128 | |
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129 | // NULL until baked |
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130 | ptr->cert = NULL; |
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131 | ptr->issuer_cert = NULL; |
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132 | *ret = ptr; |
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133 | return ABAC_ATTRIBUTE_SUCCESS; |
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134 | } |
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135 | |
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136 | int abac_attribute_bake(abac_attribute_t *ptr) { |
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137 | assert(ptr); |
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138 | |
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139 | char *cred_encoding = get_cred_encoding(ptr); |
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140 | |
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141 | // create attribute cert |
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142 | time_t not_before = time(NULL); |
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143 | time_t not_after = not_before + ptr->validity; |
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144 | chunk_t serial = abac_generate_serial(); |
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145 | |
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146 | private_key_t *private = abac_id_privkey(ptr->issuer_id); |
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147 | |
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148 | if(private==NULL) |
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149 | errx(1,"can not bake without a private key!!!"); |
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150 | |
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151 | certificate_t *attr_cert = lib->creds->create(lib->creds, |
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152 | CRED_CERTIFICATE, CERT_X509_AC, |
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153 | BUILD_CERT, abac_id_cert(ptr->issuer_id), |
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154 | BUILD_NOT_BEFORE_TIME, not_before, |
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155 | BUILD_NOT_AFTER_TIME, not_after, |
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156 | BUILD_SERIAL, serial, |
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157 | BUILD_IETF_GROUP_ATTR, cred_encoding, |
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158 | BUILD_SIGNING_CERT, abac_id_cert(ptr->issuer_id), |
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159 | BUILD_SIGNING_KEY, private, |
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160 | BUILD_END |
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161 | ); |
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162 | |
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163 | DESTROY_IF(private); |
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164 | |
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165 | if (attr_cert == NULL) |
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166 | return 0; |
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167 | |
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168 | ptr->cert = attr_cert; |
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169 | // cert and issuer can be the same, in which case it is the self signing |
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170 | ptr->issuer_cert= attr_cert->get_ref(attr_cert); |
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171 | |
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172 | free(cred_encoding); |
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173 | free(serial.ptr); |
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174 | return 1; |
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175 | } |
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176 | |
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177 | abac_chunk_t abac_attribute_cert_chunk(abac_attribute_t *ptr) { |
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178 | assert(ptr->cert); |
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179 | chunk_t encoding = chunk_empty; |
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180 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
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181 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
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182 | return ret; |
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183 | } |
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184 | |
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185 | /* just loading it without any verifying */ |
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186 | certificate_t *abac_attribute_cert_from_file(char *filename) { |
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187 | |
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188 | if(!file_exist(filename)) return NULL; |
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189 | |
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190 | libabac_init(); |
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191 | certificate_t *cert = lib->creds->create(lib->creds, |
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192 | CRED_CERTIFICATE, CERT_X509_AC, |
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193 | BUILD_FROM_FILE, filename, |
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194 | BUILD_END |
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195 | ); |
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196 | if (cert == NULL) |
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197 | errx(1, "Couldn't load attribute cert %s", filename); |
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198 | |
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199 | return cert; |
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200 | } |
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201 | |
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202 | |
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203 | certificate_t *abac_attribute_cert_from_chunk(abac_chunk_t achunk) { |
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204 | |
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205 | chunk_t chunk = { .ptr = achunk.ptr, .len = achunk.len }; |
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206 | if(achunk.len == 0) { |
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207 | errx(1, "Couldn't load attribute chunk, size of 0"); |
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208 | } |
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209 | |
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210 | libabac_init(); |
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211 | certificate_t *cert = lib->creds->create(lib->creds, |
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212 | CRED_CERTIFICATE, CERT_X509_AC, |
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213 | BUILD_BLOB_ASN1_DER, chunk, |
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214 | BUILD_END |
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215 | ); |
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216 | if (cert == NULL) |
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217 | errx(1, "Couldn't load attribute chunk"); |
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218 | |
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219 | return cert; |
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220 | } |
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221 | |
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222 | |
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223 | /** |
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224 | * Load an attribute cert with a cert. |
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225 | * Returns true only if the certificate is valid and is issued by the proper |
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226 | * authority. |
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227 | * attribute string is parsed via yyparse call |
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228 | */ |
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229 | static abac_attribute_t *_load_attribute_from_cert(certificate_t *cert) { |
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230 | ietf_attributes_t *attr_cert = NULL; |
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231 | int ret, i; |
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232 | |
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233 | // get the attr |
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234 | ac_t *ac = (ac_t *)cert; |
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235 | attr_cert = ac->get_groups(ac); |
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236 | if (attr_cert == NULL) { |
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237 | ret = ABAC_CERT_INVALID; |
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238 | goto error; |
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239 | } |
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240 | |
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241 | char *encoded_attr_string=attr_cert->get_string(attr_cert); |
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242 | char *attr_string = abac_decode_string(encoded_attr_string); |
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243 | if(debug) |
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244 | fprintf(stderr, "string to be yyparse..(%d)(%s)\n",strlen(attr_string),attr_string); |
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245 | |
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246 | if (attr_string == NULL) { |
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247 | ret = ABAC_CERT_INVALID; |
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248 | goto error; |
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249 | } |
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250 | |
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251 | /* call into yacc parser */ |
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252 | abac_reset_yyfptr(attr_string); |
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253 | abac_yy_init(); |
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254 | int rc=yyparse(); |
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255 | if (rc) { |
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256 | ret = ABAC_CERT_INVALID; |
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257 | goto error; |
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258 | } |
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259 | |
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260 | abac_aspect_t *head_aspect = NULL; |
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261 | abac_aspect_t *tail_aspect = NULL; |
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262 | abac_list_t *clauses=NULL; |
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263 | abac_id_credential_t *id_cred; |
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264 | abac_id_t *issuer_id; |
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265 | |
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266 | // get the attr |
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267 | head_aspect = abac_yy_get_rule_head_aspect(); |
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268 | tail_aspect = abac_yy_get_rule_tail_aspect(); |
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269 | clauses = abac_yy_get_rule_clauses(); |
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270 | |
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271 | // get the issuer based on keyid |
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272 | char *principalname = abac_aspect_principal_principalname(head_aspect); |
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273 | if(debug) fprintf(stderr, "LOOKING for %s\n", principalname); |
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274 | |
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275 | id_cred = abac_id_credential_lookup(principalname); |
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276 | if(id_cred == NULL) { |
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277 | ret = ABAC_CERT_MISSING_ISSUER; |
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278 | if(debug) |
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279 | fprintf(stderr, "can not find %s in id_creds\n", principalname); |
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280 | goto error; |
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281 | } |
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282 | |
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283 | issuer_id=abac_id_credential_id(id_cred); |
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284 | if (issuer_id == NULL) { |
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285 | ret = ABAC_CERT_MISSING_ISSUER; |
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286 | if(debug) |
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287 | fprintf(stderr, "can not find %s in id_creds\n", principalname); |
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288 | goto error; |
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289 | } |
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290 | // make sure the issuer's signed it |
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291 | ret = verify_signature(abac_id_cert(issuer_id), cert); |
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292 | if (!ret) { |
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293 | abac_yy_set_error_code(ABAC_RT_CERT_BAD_SIG); |
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294 | ret=ABAC_CERT_BAD_SIG; |
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295 | goto error; |
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296 | } |
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297 | |
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298 | // at this point we know we have a good attribute cert baked it in |
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299 | abac_attribute_t *attr=abac_attribute_new(issuer_id, cert, cert->get_ref(cert)); |
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300 | abac_attribute_set_head(attr, head_aspect); |
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301 | abac_attribute_add_tail(attr, tail_aspect); |
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302 | |
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303 | // free up some stuff |
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304 | attr_cert->destroy(attr_cert); |
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305 | |
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306 | return attr; |
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307 | |
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308 | error: |
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309 | if (cert) cert->destroy(cert); |
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310 | errx(1, "fail to extract attribute from a cert properly\n"); |
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311 | } |
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312 | |
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313 | abac_attribute_t *abac_attribute_from_chunk(abac_chunk_t achunk) |
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314 | { |
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315 | certificate_t *cert=abac_attribute_cert_from_chunk(achunk); |
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316 | abac_attribute_t *ret=_load_attribute_from_cert(cert); |
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317 | return ret; |
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318 | } |
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319 | |
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320 | // returns 0 if the cert hasn't been baked |
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321 | int abac_attribute_baked(abac_attribute_t *ptr) { |
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322 | return ptr->cert != NULL; |
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323 | } |
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324 | |
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325 | int abac_attribute_write_cert(abac_attribute_t *ptr, FILE *out) { |
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326 | assert(ptr != NULL); |
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327 | |
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328 | if (ptr->cert == NULL) |
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329 | return 0; |
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330 | |
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331 | // write to file |
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332 | chunk_t encoding = chunk_empty; |
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333 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
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334 | |
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335 | if(rc) { |
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336 | fwrite(encoding.ptr, encoding.len, 1, out); |
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337 | free(encoding.ptr); |
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338 | return 1; |
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339 | } |
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340 | return 0; |
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341 | } |
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342 | |
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343 | abac_attribute_t *abac_attribute_dup(abac_attribute_t *ptr) |
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344 | { |
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345 | assert(ptr); |
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346 | ++ptr->refcount; |
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347 | return ptr; |
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348 | } |
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349 | |
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350 | void abac_attribute_free(abac_attribute_t *ptr) { |
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351 | int i; |
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352 | |
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353 | if (ptr == NULL) |
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354 | return; |
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355 | |
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356 | --ptr->refcount; |
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357 | if (ptr->refcount > 0) |
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358 | return; |
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359 | |
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360 | if(ptr->issuer_id) abac_id_free(ptr->issuer_id); |
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361 | if(ptr->head) abac_aspect_free(ptr->head); |
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362 | if(ptr->tail) abac_aspect_free(ptr->tail); |
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363 | |
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364 | if(ptr->cert) DESTROY_IF(ptr->cert); |
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365 | if(ptr->issuer_cert) DESTROY_IF(ptr->issuer_cert); |
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366 | |
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367 | free(ptr); |
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368 | } |
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369 | |
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370 | |
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371 | char *abac_attribute_string(abac_attribute_t *ptr) |
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372 | { |
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373 | char *head=abac_aspect_string_with_condition(ptr->head); |
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374 | char *tail=abac_aspect_string_with_condition(ptr->tail); |
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375 | if(head==NULL || tail==NULL) |
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376 | errx(1, "attribute string, head and tail can not be NULL"); |
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377 | char *tmp=NULL; |
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378 | asprintf(&tmp,"%s<-%s",head,tail); |
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379 | return tmp; |
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380 | } |
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381 | char *abac_attribute_typed_string(abac_attribute_t *ptr) |
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382 | { |
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383 | char *head=abac_aspect_typed_string_with_condition(ptr->head); |
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384 | char *tail=abac_aspect_typed_string_with_condition(ptr->tail); |
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385 | if(head==NULL || tail==NULL) |
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386 | errx(1, "attribute typed string, head and tail can not be NULL"); |
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387 | char *tmp=NULL; |
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388 | asprintf(&tmp,"%s<-%s",head,tail); |
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389 | return tmp; |
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390 | } |
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391 | |
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392 | /********************************************************************/ |
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393 | certificate_t *abac_attribute_issuer_cert(abac_attribute_t *ptr) |
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394 | { |
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395 | assert(ptr); |
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396 | return ptr->issuer_cert; |
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397 | } |
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398 | |
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399 | abac_aspect_t *abac_attribute_head(abac_attribute_t *ptr) |
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400 | { |
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401 | assert(ptr); |
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402 | return ptr->head; |
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403 | } |
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404 | |
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405 | int abac_attribute_is_role(abac_attribute_t *ptr) |
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406 | { |
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407 | assert(ptr); |
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408 | assert(ptr->head); |
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409 | return abac_aspect_is_role(ptr->head); |
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410 | } |
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411 | |
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412 | abac_attribute_t *abac_attribute_set_head(abac_attribute_t *ptr, abac_aspect_t *head) |
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413 | { |
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414 | assert(ptr); |
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415 | ptr->head=head; |
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416 | return ptr; |
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417 | } |
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418 | |
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419 | abac_aspect_t *abac_attribute_tail(abac_attribute_t *ptr) |
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420 | { |
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421 | assert(ptr); |
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422 | return ptr->tail; |
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423 | } |
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424 | |
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425 | abac_attribute_t *abac_attribute_add_tail(abac_attribute_t *ptr, abac_aspect_t *tail) |
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426 | { |
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427 | assert(ptr); |
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428 | assert(tail); |
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429 | |
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430 | /* type of head and tail has to match */ |
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431 | abac_aspect_t *head=abac_attribute_head(ptr); |
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432 | |
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433 | if(debug) { |
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434 | fprintf(stderr, "head->(%s)\n",abac_aspect_type_string(head)); |
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435 | fprintf(stderr, "tail->(%s)\n",abac_aspect_type_string(tail)); |
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436 | } |
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437 | if(abac_aspect_is_intersecting(tail)) { |
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438 | if(debug) { |
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439 | fprintf(stderr, "tail is intersection \n"); |
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440 | fprintf(stderr, "tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
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441 | } |
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442 | if(abac_aspect_intersecting_aspect_type(tail) != abac_aspect_aspect_type(head)) |
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443 | errx(1, "head and intersecting tail's aspect type does not match"); |
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444 | } else { |
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445 | if(abac_aspect_aspect_type(head) != abac_aspect_aspect_type(tail)) { |
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446 | if(debug) |
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447 | fprintf(stderr, "tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
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448 | errx(1, "head and tail's aspect type does not match"); |
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449 | } |
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450 | } |
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451 | |
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452 | if(ptr->tail == NULL) { |
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453 | ptr->tail=abac_aspect_dup(tail); |
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454 | } else { |
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455 | if(abac_aspect_is_intersecting(ptr->tail)) { |
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456 | abac_aspect_add_intersecting_aspect(ptr->tail, tail); |
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457 | } else { |
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458 | /* special case.. if there is a tail there already and it is not an intersecting |
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459 | tail, need to turn this into an intersecting tails */ |
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460 | abac_aspect_t *nptr=abac_aspect_intersection_new(ptr->tail); |
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461 | abac_aspect_add_intersecting_aspect(nptr, tail); |
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462 | ptr->tail=nptr; |
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463 | } |
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464 | } |
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465 | return ptr; |
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466 | } |
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467 | |
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468 | certificate_t *abac_attribute_cert(abac_attribute_t *ptr) |
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469 | { |
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470 | assert(ptr); |
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471 | return ptr->cert; |
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472 | } |
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473 | |
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474 | int abac_attribute_lastone(abac_attribute_t *ptr) |
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475 | { |
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476 | assert(ptr); |
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477 | if(ptr->refcount == 1) |
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478 | return 1; |
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479 | return 0; |
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480 | } |
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481 | |
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482 | |
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483 | abac_aspect_t **abac_attribute_tail_vectorized(abac_attribute_t *ptr) |
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484 | { |
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485 | abac_aspect_t **tails=NULL; |
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486 | abac_aspect_t *tail=ptr->tail; |
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487 | abac_list_t *list=NULL; |
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488 | int cnt=0; |
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489 | if(tail != NULL) { |
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490 | if(!abac_aspect_is_intersecting(tail)) { |
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491 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * 2); |
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492 | tails[0] = abac_aspect_dup(tail); |
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493 | tails[1] = NULL; |
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494 | if(debug) { |
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495 | fprintf(stderr, "abac_attribute_tail_vectorized, only 1 tail\n"); |
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496 | } |
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497 | return tails; |
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498 | } else { |
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499 | abac_list_t *list=abac_aspect_prereqs(tail); |
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500 | cnt=abac_list_size(list); |
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501 | } |
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502 | } |
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503 | // make the array (leave space to NULL terminate it) |
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504 | // n.b., even if the list is empty, we still return an array that |
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505 | // only contains the NULL terminator |
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506 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * (cnt + 1)); |
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507 | abac_aspect_t *cur; |
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508 | int i = 0; |
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509 | if(i<cnt) { |
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510 | abac_list_foreach(list, cur, |
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511 | tails[i++] = abac_aspect_dup(cur); |
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512 | ); |
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513 | } |
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514 | tails[i] = NULL; |
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515 | if(debug) |
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516 | fprintf(stderr, "abac_attribute_tail_vectorized, %d tails\n", cnt); |
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517 | return tails; |
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518 | } |
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519 | |
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520 | void abac_aspects_free(abac_aspect_t **aspects) |
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521 | { |
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522 | /* always null terminating */ |
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523 | assert(aspects); |
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524 | int i; |
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525 | for (i = 0; aspects[i] != NULL; ++i) { |
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526 | abac_aspect_free(aspects[i]); |
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527 | } |
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528 | free(aspects); |
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529 | } |
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