[8bd77b5] | 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 | #include <err.h> |
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| 11 | |
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| 12 | #include "abac_internal.h" |
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| 13 | #include "abac_util.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 | |
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| 19 | static int debug=0; |
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| 20 | |
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| 21 | struct _abac_attribute_t { |
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| 22 | abac_id_t *issuer_id; |
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| 23 | abac_aspect_t *head; |
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| 24 | abac_aspect_t *tail; |
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| 25 | int validity; |
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| 26 | certificate_t *cert; // NULL until baked |
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| 27 | certificate_t *issuer_cert; |
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| 28 | |
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| 29 | int refcount; |
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| 30 | }; |
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| 31 | |
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| 32 | /********************************************************************/ |
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[5d06689] | 33 | char *get_cred_encoding(abac_attribute_t *ptr) |
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[8bd77b5] | 34 | { |
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| 35 | char *encoding=NULL; |
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| 36 | |
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| 37 | /* must have a head aspect and tail aspect */ |
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| 38 | assert(ptr->head != NULL); |
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| 39 | assert(ptr->tail != NULL); |
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| 40 | |
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| 41 | char *head_string=abac_aspect_typed_string_with_condition(ptr->head); |
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| 42 | char *tail_string=abac_aspect_typed_string_with_condition(ptr->tail); |
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| 43 | |
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| 44 | asprintf(&encoding,"%s<-%s", head_string,tail_string); |
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| 45 | char* base64_encoding=abac_encode_string(encoding); |
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| 46 | |
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| 47 | if(debug) printf("XXX abac_attribute_bake (%s)\n", encoding); |
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| 48 | |
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| 49 | free(encoding); |
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| 50 | free(head_string); |
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| 51 | free(tail_string); |
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| 52 | return base64_encoding; |
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| 53 | } |
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| 54 | |
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| 55 | /********************************************************************/ |
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| 56 | abac_attribute_t *abac_attribute_new(abac_id_t *issuer, certificate_t *cert, |
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| 57 | certificate_t *issuer_cert) |
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| 58 | { |
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| 59 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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| 60 | ptr->issuer_id = abac_id_dup(issuer); |
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| 61 | ptr->head = NULL; |
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| 62 | ptr->tail = NULL; |
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| 63 | ptr->validity= 365 * 86400; // default |
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| 64 | ptr->cert=cert; // already baked.. |
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| 65 | ptr->issuer_cert=issuer_cert; |
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| 66 | ptr->refcount=1; |
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| 67 | |
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| 68 | return ptr; |
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| 69 | } |
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| 70 | |
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| 71 | // validity is measured in seconds (as of 0.2.0) |
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| 72 | int abac_attribute_create(abac_attribute_t **ret, |
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| 73 | abac_aspect_t *head, abac_aspect_t *tail, int validity) |
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| 74 | { |
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| 75 | abac_id_t *issuer_id=abac_aspect_get_issuer_id(head); |
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| 76 | char *name=abac_aspect_aspect_name(head); |
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| 77 | |
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| 78 | if (abac_id_privkey(issuer_id) == NULL) |
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| 79 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
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| 80 | if (!abac_validate_clean_aspect_name(name)) |
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| 81 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
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| 82 | if (validity < 0) |
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| 83 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
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| 84 | |
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| 85 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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| 86 | ptr->issuer_id = abac_id_dup(issuer_id); |
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| 87 | ptr->head = abac_aspect_dup(head); |
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| 88 | ptr->tail = (tail!=NULL) ? abac_aspect_dup(tail):NULL; |
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| 89 | ptr->validity=(validity==0?(365 * 86400):validity); |
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| 90 | |
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| 91 | // NULL until baked |
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| 92 | ptr->cert=NULL; |
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| 93 | ptr->issuer_cert=NULL; |
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| 94 | ptr->refcount=1; |
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| 95 | *ret = ptr; |
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| 96 | return ABAC_ATTRIBUTE_SUCCESS; |
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| 97 | } |
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| 98 | |
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| 99 | // validity is measured in seconds (as of 0.2.0) |
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| 100 | int abac_attribute_create_creddy(abac_attribute_t **ret, abac_id_t *issuer, |
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| 101 | abac_aspect_t *head_aspect, abac_aspect_t *tail_aspect, char *name, int validity) |
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| 102 | { |
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| 103 | if (abac_id_privkey(issuer) == NULL) |
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| 104 | return ABAC_ATTRIBUTE_ISSUER_NOKEY; |
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| 105 | if (!abac_validate_clean_aspect_name(name)) |
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| 106 | return ABAC_ATTRIBUTE_INVALID_ROLE; |
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| 107 | if (validity < 0) |
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| 108 | return ABAC_ATTRIBUTE_INVALID_VALIDITY; |
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| 109 | |
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| 110 | abac_attribute_t *ptr = abac_xmalloc(sizeof(abac_attribute_t)); |
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| 111 | ptr->issuer_id = abac_id_dup(issuer); |
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| 112 | |
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| 113 | ptr->head=head_aspect; |
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| 114 | ptr->tail=tail_aspect; |
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| 115 | ptr->validity = validity; |
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| 116 | |
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| 117 | // NULL until baked |
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| 118 | ptr->cert = NULL; |
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| 119 | ptr->issuer_cert = NULL; |
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| 120 | *ret = ptr; |
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| 121 | return ABAC_ATTRIBUTE_SUCCESS; |
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| 122 | } |
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| 123 | |
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| 124 | int abac_attribute_bake(abac_attribute_t *ptr) { |
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| 125 | assert(ptr); |
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| 126 | |
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[5d06689] | 127 | char *cred_encoding = get_cred_encoding(ptr); |
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[8bd77b5] | 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 + ptr->validity; |
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| 132 | chunk_t serial = abac_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, abac_id_cert(ptr->issuer_id), |
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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, cred_encoding, |
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| 141 | BUILD_SIGNING_CERT, abac_id_cert(ptr->issuer_id), |
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| 142 | BUILD_SIGNING_KEY, abac_id_privkey(ptr->issuer_id), |
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| 143 | BUILD_END |
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| 144 | ); |
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[d037f54] | 145 | |
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[8bd77b5] | 146 | if (attr_cert == NULL) |
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| 147 | return 0; |
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| 148 | |
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| 149 | ptr->cert = attr_cert; |
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[137b55f] | 150 | // cert and issuer can be the same, in which case it is the self signing |
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[8bd77b5] | 151 | ptr->issuer_cert= attr_cert->get_ref(attr_cert); |
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| 152 | |
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| 153 | free(cred_encoding); |
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| 154 | free(serial.ptr); |
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| 155 | return 1; |
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| 156 | } |
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| 157 | |
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| 158 | abac_chunk_t abac_attribute_cert_chunk(abac_attribute_t *ptr) { |
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| 159 | assert(ptr->cert); |
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[137b55f] | 160 | chunk_t encoding = chunk_empty; |
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| 161 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
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[8bd77b5] | 162 | abac_chunk_t ret = { encoding.ptr, encoding.len }; |
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| 163 | return ret; |
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| 164 | } |
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| 165 | |
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| 166 | int abac_attribute_baked(abac_attribute_t *ptr) { |
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| 167 | return ptr->cert != NULL; |
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| 168 | } |
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| 169 | |
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| 170 | // returns 0 if the cert hasn't been baked |
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[5d06689] | 171 | int abac_attribute_write_cert(abac_attribute_t *ptr, FILE *out) { |
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[8bd77b5] | 172 | assert(ptr != NULL); |
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| 173 | |
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| 174 | if (ptr->cert == NULL) |
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| 175 | return 0; |
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| 176 | |
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| 177 | // write to file |
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[137b55f] | 178 | chunk_t encoding = chunk_empty; |
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| 179 | int rc=ptr->cert->get_encoding(ptr->cert,CERT_ASN1_DER,&encoding); |
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| 180 | |
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| 181 | if(rc) { |
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| 182 | fwrite(encoding.ptr, encoding.len, 1, out); |
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| 183 | free(encoding.ptr); |
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| 184 | return 1; |
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| 185 | } |
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| 186 | return 0; |
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[8bd77b5] | 187 | } |
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| 188 | |
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| 189 | abac_attribute_t *abac_attribute_dup(abac_attribute_t *ptr) |
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| 190 | { |
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| 191 | assert(ptr); |
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| 192 | ++ptr->refcount; |
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| 193 | return ptr; |
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| 194 | } |
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| 195 | |
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| 196 | void abac_attribute_free(abac_attribute_t *ptr) { |
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| 197 | int i; |
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| 198 | |
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| 199 | if (ptr == NULL) |
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| 200 | return; |
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| 201 | |
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| 202 | --ptr->refcount; |
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| 203 | if (ptr->refcount > 0) |
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| 204 | return; |
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| 205 | |
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| 206 | if(ptr->issuer_id) abac_id_free(ptr->issuer_id); |
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| 207 | if(ptr->head) abac_aspect_free(ptr->head); |
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| 208 | if(ptr->tail) abac_aspect_free(ptr->tail); |
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| 209 | |
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| 210 | if(ptr->cert) DESTROY_IF(ptr->cert); |
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| 211 | if(ptr->issuer_cert) DESTROY_IF(ptr->issuer_cert); |
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| 212 | |
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| 213 | free(ptr); |
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| 214 | } |
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| 215 | |
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[5d06689] | 216 | |
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| 217 | char *abac_attribute_string(abac_attribute_t *ptr) |
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| 218 | { |
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| 219 | char *head=abac_aspect_string_with_condition(ptr->head); |
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| 220 | char *tail=abac_aspect_string_with_condition(ptr->tail); |
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| 221 | if(head==NULL || tail==NULL) |
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| 222 | abac_errx(1, "attribute string, head and tail can not be NULL"); |
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| 223 | char *tmp=NULL; |
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| 224 | asprintf(&tmp,"%s<-%s",head,tail); |
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| 225 | return tmp; |
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| 226 | } |
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| 227 | char *abac_attribute_typed_string(abac_attribute_t *ptr) |
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| 228 | { |
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| 229 | char *head=abac_aspect_typed_string_with_condition(ptr->head); |
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| 230 | char *tail=abac_aspect_typed_string_with_condition(ptr->tail); |
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| 231 | if(head==NULL || tail==NULL) |
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| 232 | abac_errx(1, "attribute typed string, head and tail can not be NULL"); |
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| 233 | char *tmp=NULL; |
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| 234 | asprintf(&tmp,"%s<-%s",head,tail); |
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| 235 | return tmp; |
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| 236 | } |
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| 237 | |
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[8bd77b5] | 238 | /********************************************************************/ |
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| 239 | certificate_t *abac_attribute_issuer_cert(abac_attribute_t *ptr) |
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| 240 | { |
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| 241 | assert(ptr); |
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| 242 | return ptr->issuer_cert; |
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| 243 | } |
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| 244 | |
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| 245 | abac_aspect_t *abac_attribute_head(abac_attribute_t *ptr) |
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| 246 | { |
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| 247 | assert(ptr); |
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| 248 | return ptr->head; |
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| 249 | } |
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| 250 | |
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[adc0815] | 251 | bool abac_attribute_is_role(abac_attribute_t *ptr) |
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| 252 | { |
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| 253 | assert(ptr); |
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| 254 | assert(ptr->head); |
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| 255 | return abac_aspect_is_role(ptr->head); |
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| 256 | } |
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| 257 | |
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[8bd77b5] | 258 | abac_attribute_t *abac_attribute_set_head(abac_attribute_t *ptr, abac_aspect_t *head) |
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| 259 | { |
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| 260 | assert(ptr); |
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| 261 | ptr->head=head; |
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| 262 | return ptr; |
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| 263 | } |
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| 264 | |
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| 265 | abac_aspect_t *abac_attribute_tail(abac_attribute_t *ptr) |
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| 266 | { |
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| 267 | assert(ptr); |
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| 268 | return ptr->tail; |
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| 269 | } |
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| 270 | |
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| 271 | abac_attribute_t *abac_attribute_add_tail(abac_attribute_t *ptr, abac_aspect_t *tail) |
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| 272 | { |
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| 273 | assert(ptr); |
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| 274 | assert(tail); |
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| 275 | |
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| 276 | /* type of head and tail has to match */ |
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| 277 | abac_aspect_t *head=abac_attribute_head(ptr); |
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| 278 | if(abac_aspect_is_intersecting(tail)) { |
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| 279 | if(debug) { |
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| 280 | printf("tail is intersection \n"); |
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| 281 | printf("tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
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| 282 | } |
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| 283 | if(abac_aspect_intersecting_aspect_type(tail) != abac_aspect_aspect_type(head)) |
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| 284 | errx(1, "head and tail's aspect type does not match"); |
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| 285 | } else { |
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| 286 | if(abac_aspect_aspect_type(head) != abac_aspect_aspect_type(tail)) { |
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| 287 | if(debug) { |
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| 288 | printf("head->(%s)\n",abac_aspect_type_string(head)); |
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| 289 | printf("tail->(%s)\n",abac_aspect_type_string(tail)); |
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| 290 | printf("tail is (%s)\n", abac_aspect_string_with_condition(tail)); |
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| 291 | } |
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| 292 | errx(1, "head and tail's aspect type does not match"); |
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| 293 | } |
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| 294 | } |
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| 295 | |
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| 296 | if(ptr->tail == NULL) { |
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| 297 | ptr->tail=abac_aspect_dup(tail); |
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| 298 | } else { |
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| 299 | if(abac_aspect_is_intersecting(ptr->tail)) { |
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| 300 | abac_aspect_add_intersecting_aspect(ptr->tail, tail); |
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| 301 | } else { |
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| 302 | /* special case.. if there is a tail there already and it is not an intersecting |
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| 303 | tail, need to turn this into an intersecting tails */ |
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| 304 | abac_aspect_t *nptr=abac_aspect_intersection_new(ptr->tail); |
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| 305 | abac_aspect_add_intersecting_aspect(nptr, tail); |
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| 306 | ptr->tail=nptr; |
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| 307 | } |
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| 308 | } |
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| 309 | return ptr; |
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| 310 | } |
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| 311 | |
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| 312 | certificate_t *abac_attribute_cert(abac_attribute_t *ptr) |
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| 313 | { |
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| 314 | assert(ptr); |
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| 315 | return ptr->cert; |
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| 316 | } |
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| 317 | |
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| 318 | int abac_attribute_lastone(abac_attribute_t *ptr) |
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| 319 | { |
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| 320 | assert(ptr); |
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| 321 | if(ptr->refcount == 1) |
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| 322 | return 1; |
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| 323 | return 0; |
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| 324 | } |
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| 325 | |
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| 326 | |
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| 327 | abac_aspect_t **abac_attribute_tail_vectorized(abac_attribute_t *ptr) |
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| 328 | { |
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| 329 | abac_aspect_t **tails=NULL; |
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| 330 | abac_aspect_t *tail=ptr->tail; |
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| 331 | abac_list_t *list=NULL; |
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| 332 | int cnt=0; |
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| 333 | if(tail != NULL) { |
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| 334 | if(!abac_aspect_is_intersecting(tail)) { |
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| 335 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * 2); |
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| 336 | tails[0] = abac_aspect_dup(tail); |
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| 337 | tails[1] = NULL; |
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| 338 | if(debug) { |
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| 339 | printf("abac_attribute_tail_vectorized, only 1 tail\n"); |
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| 340 | } |
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| 341 | return tails; |
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| 342 | } else { |
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| 343 | abac_list_t *list=abac_aspect_prereqs(tail); |
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| 344 | cnt=abac_list_size(list); |
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| 345 | } |
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| 346 | } |
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| 347 | // make the array (leave space to NULL terminate it) |
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| 348 | // n.b., even if the list is empty, we still return an array that |
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| 349 | // only contains the NULL terminator |
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| 350 | tails = abac_xmalloc(sizeof(abac_aspect_t *) * (cnt + 1)); |
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| 351 | abac_aspect_t *cur; |
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| 352 | int i = 0; |
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| 353 | if(i<cnt) { |
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| 354 | abac_list_foreach(list, cur, |
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| 355 | tails[i++] = abac_aspect_dup(cur); |
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| 356 | ); |
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| 357 | } |
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| 358 | tails[i] = NULL; |
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| 359 | if(debug) |
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| 360 | printf("abac_attribute_tail_vectorized, %d tails\n", cnt); |
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| 361 | return tails; |
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| 362 | } |
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| 363 | |
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| 364 | void abac_aspects_free(abac_aspect_t **aspects) |
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| 365 | { |
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| 366 | /* always null terminating */ |
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| 367 | assert(aspects); |
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| 368 | int i; |
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| 369 | for (i = 0; aspects[i] != NULL; ++i) { |
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| 370 | abac_aspect_free(aspects[i]); |
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| 371 | } |
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| 372 | free(aspects); |
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| 373 | } |
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