[8bd77b5] | 1 | |
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| 2 | /* abac.c using prolog */ |
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| 3 | |
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| 4 | #include <assert.h> |
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| 5 | #include <err.h> |
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| 6 | #include <glob.h> |
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| 7 | |
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| 8 | #include <chunk.h> |
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| 9 | |
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| 10 | #include "abac_internal.h" |
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| 11 | |
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| 12 | #include "abac_pl_yap.h" |
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| 13 | #include "abac_util.h" |
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| 14 | #include "abac_verifier.h" |
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| 15 | |
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| 16 | static int debug=0; |
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| 17 | |
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| 18 | struct _abac_context_t { |
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| 19 | abac_pl_t *pl; |
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| 20 | }; |
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| 21 | |
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| 22 | /** |
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| 23 | * Init the library. |
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| 24 | */ |
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| 25 | void libabac_init(void) { |
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| 26 | void libabac_deinit(void); |
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| 27 | static int has_been_init = 0; |
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| 28 | |
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| 29 | // called every time a context is created, so only do it once |
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| 30 | if (!has_been_init) { |
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| 31 | abac_verifier_init(); |
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| 32 | atexit(libabac_deinit); |
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| 33 | has_been_init = 1; |
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| 34 | } |
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| 35 | } |
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| 36 | |
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| 37 | /** |
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| 38 | * Deinit the library. |
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| 39 | */ |
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| 40 | void libabac_deinit(void) { |
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| 41 | abac_verifier_deinit(); |
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| 42 | } |
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| 43 | |
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| 44 | /** |
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| 45 | * Create a new abac context. |
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| 46 | */ |
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| 47 | abac_context_t *abac_context_new(void) { |
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| 48 | libabac_init(); |
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| 49 | |
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| 50 | abac_context_t *ctx = abac_xmalloc(sizeof(abac_context_t)); |
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| 51 | ctx->pl = abac_pl_new(); |
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| 52 | return ctx; |
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| 53 | } |
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| 54 | |
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| 55 | /** |
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| 56 | * Deep copy an abac context. -- XXX dummy stub |
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| 57 | */ |
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| 58 | abac_context_t *abac_context_dup(abac_context_t *ctx) { |
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| 59 | assert(ctx != NULL); |
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| 60 | abac_context_t *dup = abac_xmalloc(sizeof(abac_context_t)); |
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| 61 | return dup; |
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| 62 | } |
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| 63 | |
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| 64 | |
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| 65 | /** |
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| 66 | * Free an abac context. |
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| 67 | */ |
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| 68 | void abac_context_free(abac_context_t *ctx) { |
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| 69 | assert(ctx != NULL); |
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| 70 | |
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| 71 | abac_pl_free(ctx->pl); |
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| 72 | free(ctx); |
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| 73 | } |
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| 74 | |
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| 75 | /** |
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| 76 | * Load an ID cert from an abac_id_t. |
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| 77 | */ |
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| 78 | int abac_context_load_id_id(abac_context_t *ctx, abac_id_t *id) { |
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| 79 | assert(ctx != NULL); assert(id); |
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| 80 | abac_id_credential_t *id_cert=NULL; |
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| 81 | int ret = abac_verifier_load_id_id(id,&id_cert); |
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| 82 | if(id_cert) { |
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| 83 | int add_ret = abac_pl_add_type_credential(ctx->pl, id_cert); |
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| 84 | } |
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| 85 | return ret; |
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| 86 | } |
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| 87 | |
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| 88 | /** |
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| 89 | * Load an ID cert from a file. |
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| 90 | */ |
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[d037f54] | 91 | int abac_context_load_id_file(abac_context_t *ctx, char *filename, char *keyfilename) { |
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| 92 | assert(ctx != NULL); assert(filename != NULL); assert(keyfilename!=NULL); |
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[8bd77b5] | 93 | abac_id_credential_t *id_cert=NULL; |
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[d037f54] | 94 | int ret = abac_verifier_load_id_file(filename,keyfilename,&id_cert); |
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[8bd77b5] | 95 | if(id_cert) { |
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| 96 | int add_ret = abac_pl_add_type_credential(ctx->pl, id_cert); |
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| 97 | } |
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| 98 | return ret; |
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| 99 | } |
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| 100 | |
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| 101 | /** |
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| 102 | * Load an ID cert from a chunk. |
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| 103 | */ |
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| 104 | int abac_context_load_id_chunk(abac_context_t *ctx, abac_chunk_t cert) { |
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| 105 | assert(ctx != NULL); |
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| 106 | abac_id_credential_t *id_cert=NULL; |
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| 107 | chunk_t cert_chunk = { cert.ptr, cert.len }; |
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| 108 | int ret=abac_verifier_load_id_chunk(cert_chunk,&id_cert); |
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| 109 | if(id_cert) { |
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| 110 | int add_ret = abac_pl_add_type_credential(ctx->pl, id_cert); |
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| 111 | } |
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| 112 | return ret; |
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| 113 | } |
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| 114 | |
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| 115 | /** |
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| 116 | * Load an attribute cert from an abac_attribute_t. |
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| 117 | */ |
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| 118 | int abac_context_load_attribute_attribute(abac_context_t *ctx, abac_attribute_t *ptr) |
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| 119 | { |
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| 120 | /* XXX */ |
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| 121 | int ret=0; |
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| 122 | return ret; |
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| 123 | } |
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| 124 | |
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| 125 | /** |
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| 126 | * Load an attribute cert from a file. |
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| 127 | */ |
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| 128 | int abac_context_load_attribute_file(abac_context_t *ctx, char *filename) { |
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| 129 | int ret, add_ret; |
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| 130 | abac_credential_t *cred; |
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| 131 | |
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| 132 | assert(ctx != NULL); assert(filename != NULL); |
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| 133 | |
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| 134 | ret = abac_verifier_load_attribute_cert_file(filename, &cred); |
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| 135 | if (ret == ABAC_CERT_SUCCESS) { |
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| 136 | add_ret = abac_pl_add_credential(ctx->pl, cred); |
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| 137 | assert(add_ret != ABAC_PL_CRED_INVALID); |
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| 138 | } |
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| 139 | |
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| 140 | return ret; |
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| 141 | } |
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| 142 | |
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| 143 | /** |
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| 144 | * Load an attribute cert from a chunk. |
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| 145 | */ |
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| 146 | int abac_context_load_attribute_chunk(abac_context_t *ctx, abac_chunk_t cert) { |
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| 147 | int ret, add_ret; |
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| 148 | abac_credential_t *cred; |
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| 149 | |
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| 150 | assert(ctx != NULL); |
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| 151 | |
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| 152 | chunk_t cert_chunk = { cert.ptr, cert.len }; |
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| 153 | |
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| 154 | ret = abac_verifier_load_attribute_cert_chunk(cert_chunk, &cred); |
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| 155 | if (ret == ABAC_CERT_SUCCESS) { |
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| 156 | add_ret = abac_pl_add_credential(ctx->pl, cred); |
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| 157 | assert(add_ret != ABAC_PL_CRED_INVALID); |
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| 158 | abac_credential_free(cred); |
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| 159 | } |
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| 160 | |
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| 161 | return ret; |
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| 162 | } |
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| 163 | |
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[d037f54] | 164 | #define KEY_PAT "/*_private.{der,pem}" |
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[8bd77b5] | 165 | #define ID_PAT "/*_ID.{der,pem}" |
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| 166 | #define ATTR_PAT "/*_attr.der" |
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| 167 | |
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[d037f54] | 168 | char *_make_key_filename(char *cert_file) |
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| 169 | { |
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| 170 | char *p=strstr(cert_file,"_ID."); |
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| 171 | char *head=strndup(cert_file,p-cert_file); |
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| 172 | char *tail=p+4; |
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| 173 | char *keyfile=NULL; |
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| 174 | asprintf(&keyfile,"%s_private.%s",head,tail); |
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| 175 | free(head); |
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| 176 | return keyfile; |
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| 177 | } |
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[8bd77b5] | 178 | /** |
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| 179 | * Load a directory full of certs. |
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| 180 | */ |
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| 181 | void abac_context_load_directory(abac_context_t *ctx, char *path) { |
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[d037f54] | 182 | char *glob_pat, *key_pat; |
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[8bd77b5] | 183 | glob_t glob_buf; |
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| 184 | int i, ret; |
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| 185 | |
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| 186 | assert(ctx != NULL); assert(path != NULL); |
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| 187 | |
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| 188 | int dirlen = strlen(path); |
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| 189 | glob_pat = abac_xmalloc(dirlen + sizeof(ID_PAT)); |
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| 190 | memcpy(glob_pat, path, dirlen); |
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| 191 | |
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| 192 | // first load ID certs |
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| 193 | memcpy(glob_pat + dirlen, ID_PAT, sizeof(ID_PAT)); |
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| 194 | glob(glob_pat, GLOB_BRACE, NULL, &glob_buf); // TODO check for error |
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| 195 | for (i = 0; i < glob_buf.gl_pathc; ++i) { |
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[d037f54] | 196 | /* blah_ID.pem */ |
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[8bd77b5] | 197 | char *cert_file = glob_buf.gl_pathv[i]; |
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[d037f54] | 198 | /* blah_private.pem */ |
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| 199 | char *key_file=_make_key_filename(cert_file); |
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| 200 | if(debug) { |
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| 201 | printf("--> ID cert... %s\n", cert_file); |
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| 202 | printf("--> KEY cert... %s\n", key_file); |
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| 203 | } |
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| 204 | ret = abac_context_load_id_file(ctx, cert_file, key_file); |
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[8bd77b5] | 205 | if (ret != ABAC_CERT_SUCCESS) |
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| 206 | warnx("Couldn't load ID cert %s", cert_file); |
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| 207 | } |
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| 208 | globfree(&glob_buf); |
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| 209 | |
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| 210 | // then load attr certs |
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| 211 | memcpy(glob_pat + dirlen, ATTR_PAT, sizeof(ATTR_PAT)); |
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| 212 | glob(glob_pat, 0, NULL, &glob_buf); // TODO check for error |
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| 213 | for (i = 0; i < glob_buf.gl_pathc; ++i) { |
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| 214 | char *cert_file = glob_buf.gl_pathv[i]; |
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| 215 | |
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| 216 | if(debug) printf("--> attr file... %s\n", cert_file); |
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| 217 | ret = abac_context_load_attribute_file(ctx, cert_file); |
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| 218 | if (ret != ABAC_CERT_SUCCESS) |
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| 219 | warnx("Couldn't load attribute cert %s", cert_file); |
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| 220 | } |
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| 221 | globfree(&glob_buf); |
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| 222 | |
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| 223 | free(glob_pat); |
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| 224 | } |
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| 225 | |
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| 226 | /** |
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| 227 | * Run a query on the data in an abac context. Returns a NULL-terminated array |
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| 228 | * of abac_credential_t. Success/failure in *success. |
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| 229 | * queryfor(either role or oset), with(either keyid or object type) |
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| 230 | */ |
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| 231 | abac_credential_t **abac_context_query(abac_context_t *ctx, char *queryfor, char *with, int *success) { |
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| 232 | if(debug) { |
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| 233 | printf("abac_context_query about(%s) with(%s)\n", queryfor, with); |
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| 234 | } |
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| 235 | abac_credential_t **credentials = NULL, *cur; |
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| 236 | assert(ctx != NULL); assert(queryfor != NULL); |
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| 237 | assert(with != NULL); assert(success != NULL); |
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| 238 | |
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| 239 | abac_stack_t *result = abac_pl_query(ctx->pl, queryfor, with); |
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| 240 | |
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| 241 | int size = abac_stack_size(result); |
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| 242 | if (size > 0) { |
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| 243 | *success = 1; |
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| 244 | } else { |
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| 245 | // XXX NOT SURE YET.. |
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| 246 | // return partial proof |
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| 247 | *success = 0; |
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| 248 | } |
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| 249 | |
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| 250 | // make the array (leave space to NULL terminate it) |
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| 251 | // n.b., even if the list is empty, we still return an array that |
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| 252 | // only contains the NULL terminator |
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| 253 | credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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| 254 | int i = 0; |
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| 255 | if(size) { |
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| 256 | while(i<size) { |
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| 257 | cur=(abac_credential_t *) abac_stack_pop(result); |
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| 258 | credentials[i++] = cur; |
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| 259 | } |
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| 260 | } |
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| 261 | credentials[i] = NULL; |
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| 262 | |
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| 263 | if(result) |
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| 264 | abac_stack_free(result); |
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| 265 | |
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| 266 | return credentials; |
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| 267 | } |
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| 268 | |
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| 269 | /** |
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| 270 | * A NULL-terminated array of all the credentials in the context. |
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| 271 | */ |
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| 272 | abac_credential_t **abac_context_credentials(abac_context_t *ctx) { |
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| 273 | abac_credential_t **credentials = NULL, *cur; |
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| 274 | assert(ctx != NULL); |
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| 275 | |
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| 276 | abac_stack_t *result = abac_pl_credentials(ctx->pl); |
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| 277 | int size = abac_stack_size(result); |
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| 278 | |
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| 279 | // make the array (leave space to NULL terminate it) |
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| 280 | // n.b., even if the list is empty, we still return an array that |
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| 281 | // only contains the NULL terminator |
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| 282 | credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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| 283 | int i = 0; |
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| 284 | if(size) { |
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| 285 | while(i<size) { |
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| 286 | cur=(abac_credential_t *) abac_stack_pop(result); |
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| 287 | /* if not in there yet, add into it */ |
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| 288 | credentials[i++] = cur; |
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| 289 | } |
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| 290 | } |
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| 291 | credentials[i] = NULL; |
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| 292 | |
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| 293 | if(result) |
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| 294 | abac_stack_free(result); |
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| 295 | return credentials; |
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| 296 | } |
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| 297 | |
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| 298 | /** |
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| 299 | * Frees a NULL-terminated list of credentials. |
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| 300 | */ |
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| 301 | void abac_context_credentials_free(abac_credential_t **credentials) { |
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| 302 | int i; |
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| 303 | |
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| 304 | if (credentials == NULL) |
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| 305 | return; |
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| 306 | |
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| 307 | for (i = 0; credentials[i] != NULL; ++i) |
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| 308 | abac_credential_free(credentials[i]); |
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| 309 | free(credentials); |
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| 310 | } |
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| 311 | |
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