[461541a] | 1 | |
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| 2 | /* abac_id.c */ |
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| 3 | |
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| 4 | // include the GNU extension of asprintf |
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| 5 | #define _GNU_SOURCE |
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| 6 | #include <stdio.h> |
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| 7 | #include <string.h> |
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| 8 | |
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| 9 | #include <assert.h> |
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| 10 | #include <err.h> |
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| 11 | #include <time.h> |
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| 12 | |
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| 13 | #include "libabac_common.h" |
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| 14 | #include "abac_util.h" |
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| 15 | #include "abac_openssl.h" |
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| 16 | |
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| 17 | #define KEY_SUFFIX "_private.pem" |
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| 18 | #define CERT_SUFFIX "_ID.pem" |
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| 19 | |
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| 20 | // ID object |
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| 21 | // |
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| 22 | struct _abac_id_t { |
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| 23 | char *keyid; |
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| 24 | char *cn; |
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| 25 | X509 *cert; |
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| 26 | EVP_PKEY *key; |
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| 27 | |
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| 28 | int refcount; |
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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 | * Helper function for building a ID from a cert. Used by |
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| 34 | * abac_id_from_* |
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| 35 | */ |
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| 36 | abac_id_t *_id_from_cert(X509 *cert) { |
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| 37 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 38 | id->keyid = NULL; |
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| 39 | id->cn = NULL; |
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| 40 | id->cert = cert; |
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| 41 | id->key = NULL; |
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| 42 | |
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| 43 | id->keyid = abac_get_keyid(id->cert); |
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| 44 | id->cn = abac_get_cn(cert); |
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| 45 | |
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| 46 | id->refcount = 1; |
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| 47 | |
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| 48 | return id; |
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| 49 | } |
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| 50 | |
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| 51 | /** |
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| 52 | * Load an ID cert from a file. |
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| 53 | */ |
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| 54 | abac_id_t *abac_id_from_file(char *filename) { |
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| 55 | |
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| 56 | FILE *fp=fopen(filename,"r"); |
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| 57 | if(fp==NULL) |
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| 58 | return NULL; |
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| 59 | |
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| 60 | X509 *cert = abac_load_id_from_fp(fp); |
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| 61 | fclose(fp); |
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| 62 | |
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| 63 | if (cert == NULL) |
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| 64 | return NULL; |
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| 65 | |
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| 66 | return _id_from_cert(cert); |
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| 67 | } |
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| 68 | |
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| 69 | /** |
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| 70 | * Load an ID cert from a chunk. |
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| 71 | */ |
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| 72 | abac_id_t *abac_id_from_chunk(abac_chunk_t chunk) { |
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| 73 | |
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| 74 | X509 *cert= abac_load_id_from_chunk(chunk.ptr, chunk.len); |
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| 75 | |
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| 76 | if (cert == NULL) |
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| 77 | return NULL; |
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| 78 | |
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| 79 | return _id_from_cert(cert); |
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| 80 | } |
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| 81 | |
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| 82 | /** |
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| 83 | * Load private key for a cert. |
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| 84 | */ |
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| 85 | int abac_id_privkey_from_file(abac_id_t *id, char *filename) { |
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| 86 | assert(id != NULL); |
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| 87 | |
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| 88 | FILE *fp=fopen(filename,"r"); |
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| 89 | if(fp==NULL) return ABAC_FAILURE; |
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| 90 | |
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| 91 | EVP_PKEY *key=abac_load_privkey_from_fp(fp); |
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| 92 | fclose(fp); |
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| 93 | |
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| 94 | if (key == NULL) return ABAC_FAILURE; |
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| 95 | |
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| 96 | /* needs to make sure that the key matches up with the id */ |
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| 97 | /* extract the pub key from the id */ |
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| 98 | EVP_PKEY *pubkey=extract_pubkey_from_cert(id->cert); |
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| 99 | /* cmp will just compare the pub key part of the key to see |
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| 100 | if they are the same */ |
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| 101 | if(!EVP_PKEY_cmp(pubkey, key)) { |
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| 102 | fprintf(stderr,"wrong private key for the cert!!\n"); |
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| 103 | return ABAC_FAILURE; |
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| 104 | } |
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| 105 | |
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| 106 | id->key = key; |
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| 107 | return ABAC_SUCCESS; |
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| 108 | } |
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| 109 | |
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| 110 | /** |
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| 111 | * Generate an ID with the specified CN and validity. |
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| 112 | * |
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| 113 | * validity is measured in seconds (as of 0.2.0) |
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| 114 | */ |
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| 115 | int abac_id_generate(abac_id_t **ret, char *cn, long validity) { |
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| 116 | if (cn == NULL || !abac_clean_name(cn)) |
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| 117 | return ABAC_GENERATE_INVALID_CN; |
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| 118 | |
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| 119 | if (validity < 0) |
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| 120 | return ABAC_GENERATE_INVALID_VALIDITY; |
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| 121 | |
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| 122 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 123 | |
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| 124 | id->cn = abac_xstrdup(cn); |
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| 125 | id->key = abac_generate_key(); |
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| 126 | id->cert = abac_generate_cert(id->key, cn, validity); |
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| 127 | id->keyid = abac_get_keyid(id->cert); |
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| 128 | |
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| 129 | id->refcount = 1; |
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| 130 | |
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| 131 | *ret = id; |
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| 132 | return ABAC_SUCCESS; |
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| 133 | } |
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| 134 | |
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| 135 | char *abac_id_keyid(abac_id_t *id) { |
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| 136 | if(id) return id->keyid; |
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| 137 | return NULL; |
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| 138 | } |
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| 139 | |
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| 140 | /** |
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| 141 | * Get the issuer of an ID cert. |
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| 142 | * Returns a malloc'd string that must be free'd. |
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| 143 | */ |
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| 144 | char *abac_id_issuer(abac_id_t *id) { |
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| 145 | if(id) return abac_get_issuer(id->cert); |
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| 146 | else return NULL; |
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| 147 | } |
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| 148 | |
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| 149 | /** |
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| 150 | * Gets the subject DN of an ID cert. |
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| 151 | * Returns a malloc'd string that must be free'd. |
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| 152 | */ |
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| 153 | char *abac_id_subject(abac_id_t *id) { |
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| 154 | if(id) return abac_get_subject(id->cert); |
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| 155 | else return NULL; |
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| 156 | } |
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| 157 | |
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| 158 | /** |
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| 159 | * Get the validity period. |
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| 160 | */ |
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| 161 | int abac_id_validity(abac_id_t *id,struct tm *not_before,struct tm *not_after) { |
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| 162 | assert(id); |
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| 163 | if(abac_check_validity(id->cert, not_before, not_after)==0) |
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| 164 | return ABAC_SUCCESS; |
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| 165 | return ABAC_FAILURE; |
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| 166 | } |
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| 167 | |
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| 168 | X509 *abac_id_cert(abac_id_t *id) { |
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| 169 | assert(id); |
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| 170 | return id->cert; |
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| 171 | } |
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| 172 | |
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| 173 | // get the private key from the ID |
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| 174 | // will return NULL if no key has been loaded |
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| 175 | EVP_PKEY *abac_id_privkey(abac_id_t *id) { |
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| 176 | assert(id); |
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| 177 | return id->key; |
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| 178 | } |
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| 179 | |
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| 180 | int abac_id_has_privkey(abac_id_t *id) { |
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| 181 | if(id && (id->key !=NULL)) |
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| 182 | return 1; |
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| 183 | return 0; |
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| 184 | } |
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| 185 | |
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| 186 | // see if keyid is the same as id's |
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| 187 | int abac_id_has_keyid(abac_id_t *id, char *keyid) |
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| 188 | { |
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| 189 | assert(id); assert(keyid); |
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| 190 | if(strcmp(id->keyid, keyid) == 0) |
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| 191 | return 1; |
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| 192 | return 0; |
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| 193 | } |
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| 194 | |
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| 195 | /* |
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| 196 | return a chunk with both id and key info, |
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| 197 | err if missing privkey |
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| 198 | */ |
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| 199 | int abac_id_PEM(abac_id_t *id, abac_chunk_t *chunk) { |
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| 200 | if(id==NULL) |
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| 201 | return ABAC_CERT_MISSING_ISSUER; |
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| 202 | if(id->key == NULL) |
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| 203 | return ABAC_CERT_SIGNER_NOKEY; |
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| 204 | |
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| 205 | unsigned char *kptr=NULL; |
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| 206 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 207 | if(id->key) |
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| 208 | kptr=abac_string_privkey(id->key); |
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| 209 | int len=0; |
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| 210 | |
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| 211 | char *tmp=NULL; |
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| 212 | if(kptr) { |
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| 213 | asprintf(&tmp,"%s%s", ptr,kptr); |
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| 214 | free(ptr); |
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| 215 | free(kptr); |
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| 216 | } else { |
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| 217 | tmp=ptr; |
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| 218 | } |
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| 219 | len=strlen(tmp); |
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| 220 | |
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| 221 | chunk->ptr=tmp; |
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| 222 | chunk->len=len; |
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| 223 | return ABAC_CERT_SUCCESS; |
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| 224 | } |
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| 225 | |
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| 226 | abac_chunk_t abac_id_in_PEM(abac_id_t *id) { |
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| 227 | assert(id); |
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| 228 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 229 | int len=0; |
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| 230 | if(ptr) |
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| 231 | len=strlen((char *)ptr); |
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| 232 | abac_chunk_t ret = {ptr, len }; |
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| 233 | return ret; |
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| 234 | } |
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| 235 | |
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| 236 | |
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| 237 | int abac_id_still_valid(abac_id_t *id) { |
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| 238 | assert(id); |
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| 239 | return abac_still_valid(id->cert); |
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| 240 | } |
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| 241 | |
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| 242 | /** |
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| 243 | * Get the default filename for the cert. Value must be freed by caller. |
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| 244 | */ |
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| 245 | char *abac_id_cert_filename(abac_id_t *id) { |
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| 246 | assert(id != NULL); |
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| 247 | assert(id->cn != NULL); |
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| 248 | |
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| 249 | // malloc the filename |
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| 250 | int len = strlen(id->cn) + strlen(CERT_SUFFIX) + 1; |
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| 251 | char *filename = abac_xmalloc(len); |
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| 252 | sprintf(filename, "%s" CERT_SUFFIX, id->cn); |
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| 253 | |
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| 254 | return filename; |
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| 255 | } |
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| 256 | |
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| 257 | /** |
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| 258 | * Write the ID cert to an open file pointer. |
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| 259 | * pem format |
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| 260 | */ |
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| 261 | int abac_id_write_cert(abac_id_t *id, FILE *out) { |
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| 262 | assert(id != NULL); |
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| 263 | |
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| 264 | int ret=abac_write_id_to_fp(id->cert, out); |
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| 265 | if(ret) return ABAC_FAILURE; |
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| 266 | return ABAC_SUCCESS; |
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| 267 | } |
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| 268 | |
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| 269 | /** |
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| 270 | * Default private key filename. Value must be freed by caller. |
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| 271 | */ |
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| 272 | char *abac_id_privkey_filename(abac_id_t *id) { |
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| 273 | assert(id != NULL); |
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| 274 | assert(id->cn != NULL); |
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| 275 | |
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| 276 | // malloc the filename |
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| 277 | int len = strlen(id->cn) + strlen(KEY_SUFFIX) + 1; |
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| 278 | char *filename = abac_xmalloc(len); |
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| 279 | sprintf(filename, "%s" KEY_SUFFIX, id->cn); |
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| 280 | |
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| 281 | return filename; |
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| 282 | } |
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| 283 | |
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| 284 | /** |
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| 285 | * Write the private key to a file. |
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| 286 | * Returns false if there's no private key loaded |
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| 287 | * PEM format |
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| 288 | */ |
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| 289 | int abac_id_write_privkey(abac_id_t *id, FILE *out) { |
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| 290 | assert(id != NULL); |
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| 291 | if (id->key == NULL) |
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| 292 | return ABAC_FAILURE; |
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| 293 | |
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| 294 | int ret=abac_write_privkey_to_fp(id->key, out); |
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| 295 | if (ret) |
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| 296 | return ABAC_FAILURE; |
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| 297 | |
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| 298 | return ABAC_SUCCESS; |
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| 299 | } |
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| 300 | |
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| 301 | /** |
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| 302 | * Get a abac_chunk representing the id cert. |
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| 303 | */ |
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| 304 | abac_chunk_t abac_id_cert_chunk(abac_id_t *id) { |
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| 305 | |
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| 306 | assert(id); assert(id->cert); |
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| 307 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 308 | int len=0; |
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| 309 | if(ptr) len=strlen( (char *)ptr); |
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| 310 | |
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| 311 | abac_chunk_t ret = { ptr, len }; |
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| 312 | return ret; |
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| 313 | } |
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| 314 | |
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| 315 | /** |
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| 316 | * Get a abac_chunk representing the privkey cert. |
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| 317 | */ |
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| 318 | abac_chunk_t abac_id_privkey_chunk(abac_id_t *id) { |
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| 319 | |
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| 320 | assert(id); assert(id->key); |
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| 321 | unsigned char *ptr=abac_string_privkey(id->key); |
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| 322 | int len=0; |
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| 323 | if(ptr) len=strlen( (char *)ptr); |
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| 324 | |
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| 325 | abac_chunk_t ret = { ptr, len }; |
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| 326 | return ret; |
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| 327 | } |
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| 328 | |
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| 329 | |
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| 330 | /** |
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| 331 | * Copy a ID. Actually just increases its reference count. |
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| 332 | */ |
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| 333 | abac_id_t *abac_id_dup(abac_id_t *id) { |
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| 334 | assert(id); |
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| 335 | ++id->refcount; |
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| 336 | return id; |
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| 337 | } |
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| 338 | |
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| 339 | void abac_id_free(abac_id_t *id) { |
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| 340 | if (id == NULL) |
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| 341 | return; |
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| 342 | |
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| 343 | --id->refcount; |
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| 344 | if (id->refcount > 0) |
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| 345 | return; |
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| 346 | |
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| 347 | // free once the reference count reaches 0 |
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| 348 | X509_free(id->cert); |
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| 349 | EVP_PKEY_free(id->key); |
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| 350 | |
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| 351 | free(id->keyid); |
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| 352 | free(id); |
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| 353 | } |
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| 354 | |
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