[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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[02036f4] | 20 | static int debug=0; |
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| 21 | |
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[461541a] | 22 | // ID object |
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| 23 | // |
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| 24 | struct _abac_id_t { |
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| 25 | char *keyid; |
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| 26 | char *cn; |
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| 27 | X509 *cert; |
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| 28 | EVP_PKEY *key; |
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| 29 | |
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| 30 | int refcount; |
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| 31 | }; |
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| 32 | |
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| 33 | /**************************************************************/ |
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| 34 | /** |
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| 35 | * Helper function for building a ID from a cert. Used by |
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| 36 | * abac_id_from_* |
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| 37 | */ |
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| 38 | abac_id_t *_id_from_cert(X509 *cert) { |
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| 39 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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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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[c0fd8bc] | 43 | id->keyid = abac_xstrdup(abac_get_keyid(cert)); |
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[f30b1e9] | 44 | id->cn = abac_xstrdup(abac_get_cn(cert)); |
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[461541a] | 45 | |
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| 46 | id->refcount = 1; |
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| 47 | return id; |
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| 48 | } |
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| 49 | |
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| 50 | /** |
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| 51 | * Load an ID cert from a file. |
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| 52 | */ |
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| 53 | abac_id_t *abac_id_from_file(char *filename) { |
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[ef68ac9] | 54 | libabac_init(); |
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[461541a] | 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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[02036f4] | 69 | /* for some reason, there might be beginning and trailing spaces |
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| 70 | in pem, zap the end with \0 and skip the spaces at the start*/ |
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| 71 | char *zap_spaces(char *string) |
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| 72 | { |
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| 73 | int space=0; |
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| 74 | int total=strlen(string); |
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| 75 | int i=0; |
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| 76 | char *ptr=string; |
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| 77 | while(string[i]==' ' && i<total) { |
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| 78 | i++; |
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| 79 | ptr++; |
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| 80 | } |
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| 81 | for(;i<total; i++) { |
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| 82 | if(string[i]==' ') { |
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| 83 | space++; |
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| 84 | string[i]='\0'; |
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| 85 | } |
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| 86 | } |
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| 87 | return ptr; |
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| 88 | } |
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| 89 | |
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[ec550f7] | 90 | /* turn a naked pem into a real pem */ |
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| 91 | char *make_pem_from_naked_pem(char *naked_pem) { |
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[c199a27] | 92 | /* Headers and trailers with and w/o newlines (see below) */ |
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| 93 | static char *start="-----BEGIN CERTIFICATE-----"; |
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| 94 | static char *startnl="-----BEGIN CERTIFICATE-----\n"; |
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| 95 | static char *end="-----END CERTIFICATE-----"; |
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| 96 | static char *endnl="\n-----END CERTIFICATE-----"; |
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[02036f4] | 97 | abac_chunk_t chunk; |
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[c199a27] | 98 | char *s = NULL; |
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| 99 | char *e = NULL; |
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[02036f4] | 100 | char *pem=NULL; |
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[ec550f7] | 101 | char *ptr=zap_spaces(naked_pem); |
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[c199a27] | 102 | int slen = strlen(ptr); |
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| 103 | |
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| 104 | /* |
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| 105 | * The -----BEGIN... and -----END need to be followed by newlines and the |
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| 106 | * Base64 that gets passed in here may or may not have newlines in the |
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| 107 | * right places. when we add a header or trailer, pick one that makes the |
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| 108 | * newlines right. |
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| 109 | */ |
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| 110 | if (ptr[0] == '\n') s = start; |
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| 111 | else s = startnl; |
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| 112 | |
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| 113 | if (ptr[slen-1] == '\n') e = end; |
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| 114 | else e = endnl; |
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| 115 | |
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| 116 | asprintf(&pem,"%s%s%s",s,ptr,e); |
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[ec550f7] | 117 | return pem; |
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| 118 | } |
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| 119 | |
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| 120 | /* build a x509 out of a named pem, extract the sha1 value and |
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| 121 | free up everything */ |
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| 122 | void abac_get_sha_from_nake_pem(char *naked_pem, char **sha1) { |
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| 123 | abac_chunk_t chunk; |
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| 124 | /* make a copy of this naked_pem */ |
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| 125 | char *new_naked_pem=abac_xstrdup(naked_pem); |
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| 126 | char *pem=make_pem_from_naked_pem(new_naked_pem); |
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[02036f4] | 127 | chunk.ptr=(unsigned char *)pem; |
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| 128 | chunk.len=strlen(pem); |
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| 129 | X509 *cert=abac_load_id_from_chunk(chunk.ptr,chunk.len); |
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| 130 | *sha1=NULL; |
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| 131 | if(cert) { |
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| 132 | *sha1 = abac_xstrdup(abac_get_keyid(cert)); |
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| 133 | if(debug) fprintf(stderr,"sha1 found is %s\n", *sha1); |
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| 134 | } else { |
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| 135 | *sha1=NULL; |
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| 136 | fprintf(stderr,"can not make cert from pem blob!!\n"); |
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| 137 | } |
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[ec550f7] | 138 | X509_free(cert); |
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| 139 | free(new_naked_pem); |
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| 140 | free(pem); |
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[02036f4] | 141 | } |
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| 142 | |
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[461541a] | 143 | /** |
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| 144 | * Load an ID cert from a chunk. |
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| 145 | */ |
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| 146 | abac_id_t *abac_id_from_chunk(abac_chunk_t chunk) { |
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[ef68ac9] | 147 | libabac_init(); |
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[461541a] | 148 | X509 *cert= abac_load_id_from_chunk(chunk.ptr, chunk.len); |
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| 149 | |
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| 150 | if (cert == NULL) |
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| 151 | return NULL; |
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| 152 | |
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| 153 | return _id_from_cert(cert); |
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| 154 | } |
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| 155 | |
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[9e063cb] | 156 | static EVP_PKEY *_load_privkey_from_file(char *filename) |
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| 157 | { |
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| 158 | FILE *fp=fopen(filename,"r"); |
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| 159 | if(fp==NULL) return NULL; |
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| 160 | EVP_PKEY *key=abac_load_privkey_from_fp(fp); |
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| 161 | fclose(fp); |
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| 162 | return key; |
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| 163 | } |
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| 164 | |
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[461541a] | 165 | /** |
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| 166 | * Load private key for a cert. |
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| 167 | */ |
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| 168 | int abac_id_privkey_from_file(abac_id_t *id, char *filename) { |
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| 169 | assert(id != NULL); |
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| 170 | |
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[9e063cb] | 171 | EVP_PKEY *key=_load_privkey_from_file(filename); |
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[461541a] | 172 | if (key == NULL) return ABAC_FAILURE; |
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| 173 | |
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| 174 | /* needs to make sure that the key matches up with the id */ |
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| 175 | /* extract the pub key from the id */ |
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| 176 | EVP_PKEY *pubkey=extract_pubkey_from_cert(id->cert); |
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| 177 | /* cmp will just compare the pub key part of the key to see |
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| 178 | if they are the same */ |
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| 179 | if(!EVP_PKEY_cmp(pubkey, key)) { |
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| 180 | fprintf(stderr,"wrong private key for the cert!!\n"); |
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| 181 | return ABAC_FAILURE; |
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| 182 | } |
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| 183 | |
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| 184 | id->key = key; |
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| 185 | return ABAC_SUCCESS; |
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| 186 | } |
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| 187 | |
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[a02c849] | 188 | int abac_id_privkey_from_chunk(abac_id_t *id, abac_chunk_t chunk) { |
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| 189 | assert(id != NULL); |
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| 190 | |
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| 191 | EVP_PKEY *key=abac_load_privkey_from_chunk(chunk.ptr, chunk.len); |
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| 192 | if (key == NULL) return ABAC_FAILURE; |
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| 193 | |
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| 194 | /* needs to make sure that the key matches up with the id */ |
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| 195 | /* extract the pub key from the id */ |
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| 196 | EVP_PKEY *pubkey=extract_pubkey_from_cert(id->cert); |
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| 197 | /* cmp will just compare the pub key part of the key to see |
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| 198 | if they are the same */ |
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| 199 | if(!EVP_PKEY_cmp(pubkey, key)) { |
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| 200 | fprintf(stderr,"wrong private key for the cert!!\n"); |
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| 201 | return ABAC_FAILURE; |
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| 202 | } |
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| 203 | id->key = key; |
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| 204 | return ABAC_SUCCESS; |
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| 205 | } |
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| 206 | |
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[ec550f7] | 207 | /* pass a privkey from one id to another, very special case for |
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| 208 | preloading issuer id when attribute is being loaded and when |
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| 209 | there is an exising principal credential in the hashlist but |
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| 210 | did not have its privkey setup yet */ |
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| 211 | int abac_id_pass_privkey_from_id(abac_id_t *to_id, abac_id_t *from_id) { |
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| 212 | EVP_PKEY *key=from_id->key; |
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| 213 | from_id->key=NULL; /* reset the one in from so it does not get freed */ |
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| 214 | if (key==NULL) return ABAC_FAILURE; |
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| 215 | |
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| 216 | /* needs to make sure that the key matches up with the id */ |
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| 217 | /* extract the pub key from the id */ |
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| 218 | EVP_PKEY *pubkey=extract_pubkey_from_cert(to_id->cert); |
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| 219 | /* cmp will just compare the pub key part of the key to see |
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| 220 | if they are the same */ |
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| 221 | if(!EVP_PKEY_cmp(pubkey, key)) { |
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| 222 | fprintf(stderr,"wrong private key for the cert!!\n"); |
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| 223 | return ABAC_FAILURE; |
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| 224 | } |
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| 225 | to_id->key = key; |
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| 226 | return ABAC_SUCCESS; |
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| 227 | } |
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| 228 | |
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[461541a] | 229 | /** |
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| 230 | * Generate an ID with the specified CN and validity. |
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| 231 | * |
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| 232 | * validity is measured in seconds (as of 0.2.0) |
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| 233 | */ |
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| 234 | int abac_id_generate(abac_id_t **ret, char *cn, long validity) { |
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[ef68ac9] | 235 | libabac_init(); |
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[461541a] | 236 | if (cn == NULL || !abac_clean_name(cn)) |
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| 237 | return ABAC_GENERATE_INVALID_CN; |
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| 238 | |
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| 239 | if (validity < 0) |
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| 240 | return ABAC_GENERATE_INVALID_VALIDITY; |
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| 241 | |
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| 242 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 243 | |
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| 244 | id->cn = abac_xstrdup(cn); |
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| 245 | id->key = abac_generate_key(); |
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| 246 | id->cert = abac_generate_cert(id->key, cn, validity); |
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[c0fd8bc] | 247 | id->keyid = abac_xstrdup(abac_get_keyid(id->cert)); |
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[461541a] | 248 | |
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| 249 | id->refcount = 1; |
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| 250 | |
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| 251 | *ret = id; |
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| 252 | return ABAC_SUCCESS; |
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| 253 | } |
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| 254 | |
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[9e063cb] | 255 | /** |
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| 256 | * Generate an ID with the specified CN and validity. |
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| 257 | * |
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| 258 | * validity is measured in seconds (as of 0.2.0) |
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| 259 | */ |
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| 260 | int abac_id_generate_with_key(abac_id_t **ret, char *cn, long validity, char *keyfile) { |
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[ef68ac9] | 261 | libabac_init(); |
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[9e063cb] | 262 | if (cn == NULL || !abac_clean_name(cn)) |
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| 263 | return ABAC_GENERATE_INVALID_CN; |
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| 264 | |
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| 265 | if (validity < 0) |
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| 266 | return ABAC_GENERATE_INVALID_VALIDITY; |
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| 267 | |
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| 268 | abac_id_t *id = abac_xmalloc(sizeof(abac_id_t)); |
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| 269 | |
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| 270 | id->cn = abac_xstrdup(cn); |
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| 271 | id->key = _load_privkey_from_file(keyfile); |
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| 272 | id->cert = abac_generate_cert(id->key, cn, validity); |
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[c0fd8bc] | 273 | id->keyid = abac_xstrdup(abac_get_keyid(id->cert)); |
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[9e063cb] | 274 | id->refcount = 1; |
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| 275 | |
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| 276 | *ret = id; |
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| 277 | return ABAC_SUCCESS; |
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| 278 | } |
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| 279 | |
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[461541a] | 280 | char *abac_id_keyid(abac_id_t *id) { |
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| 281 | if(id) return id->keyid; |
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| 282 | return NULL; |
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| 283 | } |
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| 284 | |
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| 285 | /** |
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| 286 | * Get the issuer of an ID cert. |
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| 287 | * Returns a malloc'd string that must be free'd. |
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| 288 | */ |
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| 289 | char *abac_id_issuer(abac_id_t *id) { |
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| 290 | if(id) return abac_get_issuer(id->cert); |
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| 291 | else return NULL; |
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| 292 | } |
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| 293 | |
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| 294 | /** |
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| 295 | * Gets the subject DN of an ID cert. |
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| 296 | * Returns a malloc'd string that must be free'd. |
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| 297 | */ |
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| 298 | char *abac_id_subject(abac_id_t *id) { |
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| 299 | if(id) return abac_get_subject(id->cert); |
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| 300 | else return NULL; |
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| 301 | } |
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| 302 | |
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| 303 | /** |
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| 304 | * Get the validity period. |
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| 305 | */ |
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| 306 | int abac_id_validity(abac_id_t *id,struct tm *not_before,struct tm *not_after) { |
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| 307 | assert(id); |
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| 308 | if(abac_check_validity(id->cert, not_before, not_after)==0) |
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| 309 | return ABAC_SUCCESS; |
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| 310 | return ABAC_FAILURE; |
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| 311 | } |
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| 312 | |
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| 313 | X509 *abac_id_cert(abac_id_t *id) { |
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| 314 | assert(id); |
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| 315 | return id->cert; |
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| 316 | } |
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| 317 | |
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| 318 | // get the private key from the ID |
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| 319 | // will return NULL if no key has been loaded |
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| 320 | EVP_PKEY *abac_id_privkey(abac_id_t *id) { |
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| 321 | assert(id); |
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| 322 | return id->key; |
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| 323 | } |
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| 324 | |
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| 325 | int abac_id_has_privkey(abac_id_t *id) { |
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| 326 | if(id && (id->key !=NULL)) |
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| 327 | return 1; |
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| 328 | return 0; |
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| 329 | } |
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| 330 | |
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| 331 | // see if keyid is the same as id's |
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| 332 | int abac_id_has_keyid(abac_id_t *id, char *keyid) |
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| 333 | { |
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| 334 | assert(id); assert(keyid); |
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| 335 | if(strcmp(id->keyid, keyid) == 0) |
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| 336 | return 1; |
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| 337 | return 0; |
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| 338 | } |
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| 339 | |
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| 340 | /* |
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| 341 | return a chunk with both id and key info, |
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| 342 | err if missing privkey |
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| 343 | */ |
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| 344 | int abac_id_PEM(abac_id_t *id, abac_chunk_t *chunk) { |
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| 345 | if(id==NULL) |
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| 346 | return ABAC_CERT_MISSING_ISSUER; |
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| 347 | if(id->key == NULL) |
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| 348 | return ABAC_CERT_SIGNER_NOKEY; |
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| 349 | |
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| 350 | unsigned char *kptr=NULL; |
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| 351 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 352 | if(id->key) |
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| 353 | kptr=abac_string_privkey(id->key); |
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| 354 | int len=0; |
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| 355 | |
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| 356 | char *tmp=NULL; |
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| 357 | if(kptr) { |
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| 358 | asprintf(&tmp,"%s%s", ptr,kptr); |
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| 359 | free(ptr); |
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| 360 | free(kptr); |
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| 361 | } else { |
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[9ac7fb4] | 362 | tmp=(char *)ptr; |
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[461541a] | 363 | } |
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| 364 | len=strlen(tmp); |
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| 365 | |
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[9ac7fb4] | 366 | chunk->ptr=(unsigned char *)tmp; |
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[461541a] | 367 | chunk->len=len; |
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| 368 | return ABAC_CERT_SUCCESS; |
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| 369 | } |
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| 370 | |
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| 371 | abac_chunk_t abac_id_in_PEM(abac_id_t *id) { |
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| 372 | assert(id); |
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| 373 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 374 | int len=0; |
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| 375 | if(ptr) |
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| 376 | len=strlen((char *)ptr); |
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| 377 | abac_chunk_t ret = {ptr, len }; |
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| 378 | return ret; |
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| 379 | } |
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| 380 | |
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| 381 | |
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| 382 | int abac_id_still_valid(abac_id_t *id) { |
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| 383 | assert(id); |
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| 384 | return abac_still_valid(id->cert); |
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| 385 | } |
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| 386 | |
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| 387 | /** |
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| 388 | * Get the default filename for the cert. Value must be freed by caller. |
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| 389 | */ |
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| 390 | char *abac_id_cert_filename(abac_id_t *id) { |
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| 391 | assert(id != NULL); |
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| 392 | assert(id->cn != NULL); |
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| 393 | |
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| 394 | // malloc the filename |
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| 395 | int len = strlen(id->cn) + strlen(CERT_SUFFIX) + 1; |
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| 396 | char *filename = abac_xmalloc(len); |
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| 397 | sprintf(filename, "%s" CERT_SUFFIX, id->cn); |
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| 398 | |
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| 399 | return filename; |
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| 400 | } |
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| 401 | |
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| 402 | /** |
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| 403 | * Write the ID cert to an open file pointer. |
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| 404 | * pem format |
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| 405 | */ |
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| 406 | int abac_id_write_cert(abac_id_t *id, FILE *out) { |
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| 407 | assert(id != NULL); |
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| 408 | |
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| 409 | int ret=abac_write_id_to_fp(id->cert, out); |
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| 410 | if(ret) return ABAC_FAILURE; |
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| 411 | return ABAC_SUCCESS; |
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| 412 | } |
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| 413 | |
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| 414 | /** |
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| 415 | * Default private key filename. Value must be freed by caller. |
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| 416 | */ |
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| 417 | char *abac_id_privkey_filename(abac_id_t *id) { |
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| 418 | assert(id != NULL); |
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| 419 | assert(id->cn != NULL); |
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| 420 | |
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| 421 | // malloc the filename |
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| 422 | int len = strlen(id->cn) + strlen(KEY_SUFFIX) + 1; |
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| 423 | char *filename = abac_xmalloc(len); |
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| 424 | sprintf(filename, "%s" KEY_SUFFIX, id->cn); |
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| 425 | |
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| 426 | return filename; |
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| 427 | } |
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| 428 | |
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| 429 | /** |
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| 430 | * Write the private key to a file. |
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| 431 | * Returns false if there's no private key loaded |
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| 432 | * PEM format |
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| 433 | */ |
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| 434 | int abac_id_write_privkey(abac_id_t *id, FILE *out) { |
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| 435 | assert(id != NULL); |
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| 436 | if (id->key == NULL) |
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| 437 | return ABAC_FAILURE; |
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| 438 | |
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| 439 | int ret=abac_write_privkey_to_fp(id->key, out); |
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| 440 | if (ret) |
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| 441 | return ABAC_FAILURE; |
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| 442 | |
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| 443 | return ABAC_SUCCESS; |
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| 444 | } |
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| 445 | |
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| 446 | /** |
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| 447 | * Get a abac_chunk representing the id cert. |
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| 448 | */ |
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| 449 | abac_chunk_t abac_id_cert_chunk(abac_id_t *id) { |
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| 450 | |
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| 451 | assert(id); assert(id->cert); |
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| 452 | unsigned char *ptr=abac_string_cert(id->cert); |
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| 453 | int len=0; |
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| 454 | if(ptr) len=strlen( (char *)ptr); |
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| 455 | |
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| 456 | abac_chunk_t ret = { ptr, len }; |
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| 457 | return ret; |
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| 458 | } |
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| 459 | |
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| 460 | /** |
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| 461 | * Get a abac_chunk representing the privkey cert. |
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| 462 | */ |
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| 463 | abac_chunk_t abac_id_privkey_chunk(abac_id_t *id) { |
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| 464 | |
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| 465 | assert(id); assert(id->key); |
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| 466 | unsigned char *ptr=abac_string_privkey(id->key); |
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| 467 | int len=0; |
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| 468 | if(ptr) len=strlen( (char *)ptr); |
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| 469 | |
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| 470 | abac_chunk_t ret = { ptr, len }; |
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| 471 | return ret; |
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| 472 | } |
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| 473 | |
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| 474 | |
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| 475 | /** |
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| 476 | * Copy a ID. Actually just increases its reference count. |
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| 477 | */ |
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| 478 | abac_id_t *abac_id_dup(abac_id_t *id) { |
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| 479 | assert(id); |
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| 480 | ++id->refcount; |
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| 481 | return id; |
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| 482 | } |
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| 483 | |
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| 484 | void abac_id_free(abac_id_t *id) { |
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| 485 | if (id == NULL) |
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| 486 | return; |
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| 487 | |
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| 488 | --id->refcount; |
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| 489 | if (id->refcount > 0) |
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| 490 | return; |
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| 491 | |
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| 492 | // free once the reference count reaches 0 |
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| 493 | X509_free(id->cert); |
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| 494 | EVP_PKEY_free(id->key); |
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| 495 | |
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| 496 | free(id->keyid); |
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| 497 | free(id); |
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| 498 | } |
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| 499 | |
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