[461541a] | 1 | /* abac.c */ |
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| 2 | |
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[90d20f0] | 3 | #include <assert.h> |
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[0bf0e67] | 4 | #include <err.h> |
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[bec30b5] | 5 | #include <sys/types.h> |
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| 6 | #include <sys/stat.h> |
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| 7 | #include <unistd.h> |
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| 8 | #include <dirent.h> |
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[90d20f0] | 9 | |
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[9efbfbf] | 10 | #include "abac.h" |
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[4721618] | 11 | #include "abac_list.h" |
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[06293d1] | 12 | #include "abac_graph.h" |
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[3c251d0] | 13 | #include "abac_util.h" |
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[43e3b71] | 14 | #include "abac_verifier.h" |
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[90d20f0] | 15 | |
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[bec30b5] | 16 | int debug=0; |
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| 17 | abac_id_cert_t **abac_context_principals(abac_context_t *ctx); |
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| 18 | void abac_context_id_credentials_free(abac_id_cert_t **id_credentials); |
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| 19 | |
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[390f749] | 20 | struct _abac_context_t { |
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[bec30b5] | 21 | /* list of principal id credentials, abac_id_cert_t */ |
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| 22 | abac_list_t *id_certs; |
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[06293d1] | 23 | abac_graph_t *graph; |
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[90d20f0] | 24 | }; |
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| 25 | |
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| 26 | /** |
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| 27 | * Init the library. |
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| 28 | */ |
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| 29 | void libabac_init(void) { |
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[55c272b] | 30 | void libabac_deinit(void); |
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| 31 | static int has_been_init = 0; |
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| 32 | |
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| 33 | // called every time a context is created, so only do it once |
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| 34 | if (!has_been_init) { |
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| 35 | abac_verifier_init(); |
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| 36 | atexit(libabac_deinit); |
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| 37 | has_been_init = 1; |
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| 38 | } |
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[90d20f0] | 39 | } |
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| 40 | |
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| 41 | /** |
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| 42 | * Deinit the library. |
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| 43 | */ |
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| 44 | void libabac_deinit(void) { |
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[43e3b71] | 45 | abac_verifier_deinit(); |
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[90d20f0] | 46 | } |
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| 47 | |
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| 48 | /** |
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| 49 | * Create a new abac context. |
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| 50 | */ |
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[390f749] | 51 | abac_context_t *abac_context_new(void) { |
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[55c272b] | 52 | libabac_init(); |
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| 53 | |
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[390f749] | 54 | abac_context_t *ctx = abac_xmalloc(sizeof(abac_context_t)); |
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| 55 | ctx->graph = abac_graph_new(); |
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[bec30b5] | 56 | ctx->id_certs=abac_list_new(); |
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[390f749] | 57 | return ctx; |
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[90d20f0] | 58 | } |
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| 59 | |
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| 60 | /** |
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| 61 | * Deep copy an abac context. |
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| 62 | */ |
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[390f749] | 63 | abac_context_t *abac_context_dup(abac_context_t *ctx) { |
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| 64 | assert(ctx != NULL); |
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[bec30b5] | 65 | |
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[390f749] | 66 | abac_context_t *dup = abac_xmalloc(sizeof(abac_context_t)); |
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| 67 | dup->graph = abac_graph_dup(ctx->graph); |
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[bec30b5] | 68 | dup->id_certs=abac_list_new(); |
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| 69 | |
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| 70 | abac_id_cert_t *id_cert; |
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| 71 | abac_list_foreach(ctx->id_certs, id_cert, |
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| 72 | abac_list_add(dup->id_certs, abac_id_cert_dup(id_cert)); |
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| 73 | ); |
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[90d20f0] | 74 | |
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| 75 | return dup; |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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| 79 | * Free an abac context. |
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| 80 | */ |
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[390f749] | 81 | void abac_context_free(abac_context_t *ctx) { |
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| 82 | assert(ctx != NULL); |
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[90d20f0] | 83 | |
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[390f749] | 84 | abac_graph_free(ctx->graph); |
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[bec30b5] | 85 | |
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| 86 | abac_id_cert_t *id_cert; |
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| 87 | abac_list_foreach(ctx->id_certs, id_cert, |
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| 88 | abac_id_cert_free(id_cert); |
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| 89 | ); |
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| 90 | abac_list_free(ctx->id_certs); |
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[390f749] | 91 | free(ctx); |
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[90d20f0] | 92 | } |
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| 93 | |
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| 94 | /** |
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| 95 | * Load an ID cert from a file. |
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| 96 | */ |
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[390f749] | 97 | int abac_context_load_id_file(abac_context_t *ctx, char *filename) { |
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| 98 | assert(ctx != NULL); assert(filename != NULL); |
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[bec30b5] | 99 | return abac_verifier_load_id_file(ctx->id_certs,filename); |
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[90d20f0] | 100 | } |
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| 101 | |
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| 102 | /** |
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| 103 | * Load an ID cert from a chunk. |
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| 104 | */ |
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[461541a] | 105 | int abac_context_load_id_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) { |
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[390f749] | 106 | assert(ctx != NULL); |
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[bec30b5] | 107 | return abac_verifier_load_id_chunk(ctx->id_certs,cert_chunk); |
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[90d20f0] | 108 | } |
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| 109 | |
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| 110 | /** |
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| 111 | * Load an attribute cert from a file. |
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| 112 | */ |
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[390f749] | 113 | int abac_context_load_attribute_file(abac_context_t *ctx, char *filename) { |
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[0779c99] | 114 | int ret, add_ret; |
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[461541a] | 115 | abac_list_t *cred_list=abac_list_new(); // could be more than 1 |
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[0779c99] | 116 | abac_credential_t *cred; |
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[6dd2d1a] | 117 | |
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[390f749] | 118 | assert(ctx != NULL); assert(filename != NULL); |
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[90d20f0] | 119 | |
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[bec30b5] | 120 | ret = abac_verifier_load_attribute_cert_file(ctx->id_certs, filename, cred_list); |
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[461541a] | 121 | |
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[0779c99] | 122 | if (ret == ABAC_CERT_SUCCESS) { |
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[461541a] | 123 | int size = abac_list_size(cred_list); |
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| 124 | if(size) { |
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| 125 | abac_list_foreach(cred_list, cred, |
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| 126 | add_ret = abac_graph_add_credential(ctx->graph, cred); |
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| 127 | assert(add_ret != ABAC_GRAPH_CRED_INVALID); |
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| 128 | abac_credential_free(cred); |
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| 129 | ); |
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| 130 | abac_list_free(cred_list); |
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| 131 | } |
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[6dd2d1a] | 132 | } |
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| 133 | return ret; |
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[90d20f0] | 134 | } |
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| 135 | |
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| 136 | /** |
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| 137 | * Load an attribute cert from a chunk. |
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| 138 | */ |
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[461541a] | 139 | int abac_context_load_attribute_chunk(abac_context_t *ctx, abac_chunk_t cert_chunk) { |
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[0779c99] | 140 | int ret, add_ret; |
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[4721618] | 141 | abac_list_t *cred_list=abac_list_new(); // could be more than 1 |
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[0779c99] | 142 | abac_credential_t *cred; |
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| 143 | |
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[390f749] | 144 | assert(ctx != NULL); |
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[90d20f0] | 145 | |
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[bec30b5] | 146 | ret = abac_verifier_load_attribute_cert_chunk(ctx->id_certs, cert_chunk, cred_list); |
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[0779c99] | 147 | if (ret == ABAC_CERT_SUCCESS) { |
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[461541a] | 148 | int size = abac_list_size(cred_list); |
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| 149 | if(size) { |
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| 150 | abac_list_foreach(cred_list, cred, |
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| 151 | add_ret = abac_graph_add_credential(ctx->graph, cred); |
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| 152 | assert(add_ret != ABAC_GRAPH_CRED_INVALID); |
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| 153 | abac_credential_free(cred); |
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| 154 | ); |
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| 155 | abac_list_free(cred_list); |
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| 156 | } |
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[0779c99] | 157 | } |
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| 158 | |
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| 159 | return ret; |
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[90d20f0] | 160 | } |
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| 161 | |
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[50b9dc9] | 162 | #define ID_PAT "/*_ID.{der,pem}" |
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[461541a] | 163 | #define ATTR_PAT "/*_attr.xml" |
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[03b3293] | 164 | |
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[bec30b5] | 165 | static int is_regular_file(char *filename) |
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| 166 | { |
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| 167 | struct stat sb; |
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| 168 | if(stat(filename,&sb) == -1) |
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| 169 | return 0; |
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| 170 | if((sb.st_mode & S_IFMT) == S_IFREG) |
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| 171 | return 1; |
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| 172 | return 0; |
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| 173 | } |
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| 174 | |
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[03b3293] | 175 | /** |
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| 176 | * Load a directory full of certs. |
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| 177 | */ |
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[390f749] | 178 | void abac_context_load_directory(abac_context_t *ctx, char *path) { |
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[bec30b5] | 179 | DIR *dp; |
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| 180 | struct dirent *ep; |
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| 181 | |
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| 182 | dp = opendir (path); |
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| 183 | if (dp != NULL) { |
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| 184 | while (ep = readdir (dp)) { |
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| 185 | if(is_regular_file(ep->d_name)) { |
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| 186 | int ret = abac_context_load_id_file(ctx, ep->d_name); |
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| 187 | if (ret == ABAC_CERT_SUCCESS) { |
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| 188 | if(debug) fprintf(stderr,"abac_context_load_directory, found an id %s\n",ep->d_name); |
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| 189 | continue; |
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| 190 | } |
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| 191 | ret = abac_context_load_attribute_file(ctx, ep->d_name); |
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| 192 | if (ret == ABAC_CERT_SUCCESS) { |
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| 193 | if(debug) fprintf(stderr,"abac_context_load_directory, found an attr %s\n",ep->d_name); |
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| 194 | } |
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| 195 | } |
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| 196 | } |
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| 197 | (void) closedir (dp); |
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| 198 | } else fprintf(stderr, "abac_load_directory, Couldn't open the directory\n"); |
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[03b3293] | 199 | } |
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| 200 | |
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[90d20f0] | 201 | /** |
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[dc62c68] | 202 | * Run a query on the data in an abac context. Returns a NULL-terminated array |
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[38782df] | 203 | * of abac_credential_t. Success/failure in *success. |
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[90d20f0] | 204 | */ |
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[4e426c9] | 205 | abac_credential_t **abac_context_query(abac_context_t *ctx, char *role, char *principal, int *success) { |
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[401a054] | 206 | abac_credential_t **credentials = NULL, *cur; |
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[dc62c68] | 207 | int i = 0; |
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| 208 | |
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[4e426c9] | 209 | assert(ctx != NULL); assert(role != NULL); assert(principal != NULL); assert(success != NULL); |
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[90d20f0] | 210 | |
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[390f749] | 211 | abac_graph_t *result_graph = abac_graph_query(ctx->graph, role, principal); |
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[401a054] | 212 | abac_list_t *result = abac_graph_credentials(result_graph); |
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[90d20f0] | 213 | |
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[06293d1] | 214 | abac_graph_free(result_graph); |
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[90d20f0] | 215 | |
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[6d5623e] | 216 | int size = abac_list_size(result); |
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[4e426c9] | 217 | if (size > 0) |
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| 218 | *success = 1; |
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| 219 | |
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| 220 | // if there is no actual path, return everything that can reach the role |
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| 221 | else { |
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| 222 | *success = 0; |
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| 223 | abac_list_free(result); |
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[d4b3b52] | 224 | result_graph = abac_graph_new(); |
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| 225 | |
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| 226 | // TODO: This can probably be better, but it now returns an |
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| 227 | // approximation of a partial proof. It returns all the attributes the |
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| 228 | // principal can reach and all the attributes that will lead to a |
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| 229 | // success. |
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| 230 | |
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| 231 | /* Get all the attributes of the principal. This calls sub-queries to |
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| 232 | * flesh out the indirect proofs. */ |
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| 233 | result_graph = abac_graph_principal_creds(ctx->graph, principal); |
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| 234 | |
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| 235 | /* This gets all the attributes linked to the target en route to the |
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| 236 | * principal. */ |
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| 237 | result = abac_graph_postorder_credentials(ctx->graph, role); |
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| 238 | |
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| 239 | /* Merge responses */ |
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| 240 | abac_list_foreach(result, cur, |
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| 241 | abac_graph_add_credential(result_graph, cur); |
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| 242 | ); |
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| 243 | abac_list_free(result); |
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| 244 | abac_graph_derive_links(result_graph); |
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| 245 | |
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| 246 | result = abac_graph_credentials(result_graph); |
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| 247 | abac_graph_free(result_graph); |
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[4e426c9] | 248 | |
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| 249 | size = abac_list_size(result); |
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| 250 | } |
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| 251 | |
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[38782df] | 252 | // make the array (leave space to NULL terminate it) |
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| 253 | // n.b., even if the list is empty, we still return an array that |
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| 254 | // only contains the NULL terminator |
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| 255 | credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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| 256 | abac_list_foreach(result, cur, |
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| 257 | credentials[i++] = cur; |
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| 258 | ); |
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| 259 | credentials[i] = NULL; |
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[dc62c68] | 260 | |
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[6d5623e] | 261 | abac_list_free(result); |
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[dc62c68] | 262 | |
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[401a054] | 263 | return credentials; |
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[90d20f0] | 264 | } |
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| 265 | |
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[bec30b5] | 266 | |
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[90d20f0] | 267 | /** |
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[3c4fd68] | 268 | * A NULL-terminated array of all the credentials in the context. |
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[90d20f0] | 269 | */ |
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[3c4fd68] | 270 | abac_credential_t **abac_context_credentials(abac_context_t *ctx) { |
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| 271 | abac_credential_t *cred; |
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| 272 | int i = 0; |
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| 273 | |
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| 274 | assert(ctx != NULL); |
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| 275 | |
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| 276 | abac_list_t *cred_list = abac_graph_credentials(ctx->graph); |
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| 277 | int size = abac_list_size(cred_list); |
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| 278 | |
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| 279 | abac_credential_t **credentials = abac_xmalloc(sizeof(abac_credential_t *) * (size + 1)); |
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| 280 | abac_list_foreach(cred_list, cred, |
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| 281 | credentials[i++] = cred; |
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| 282 | ); |
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| 283 | credentials[i] = NULL; |
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| 284 | |
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| 285 | abac_list_free(cred_list); |
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| 286 | |
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[bec30b5] | 287 | if(debug) { |
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| 288 | abac_id_cert_t **ilist=abac_context_principals(ctx); |
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| 289 | abac_id_cert_t *cert; |
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| 290 | if (ilist != NULL) |
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| 291 | for (i = 0; ilist[i] != NULL; ++i) { |
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| 292 | cert = ilist[i]; |
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| 293 | printf("id[%d] %s\n",i, abac_id_cert_keyid(cert)); |
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| 294 | } |
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| 295 | abac_context_id_credentials_free(ilist); |
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| 296 | } |
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| 297 | |
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[3c4fd68] | 298 | return credentials; |
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| 299 | } |
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| 300 | |
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[bec30b5] | 301 | /** |
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| 302 | * A NULL-terminated array of all the principals in the context. |
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| 303 | */ |
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| 304 | abac_id_cert_t **abac_context_principals(abac_context_t *ctx) |
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| 305 | { |
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| 306 | abac_id_cert_t **principals = NULL, *cur; |
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| 307 | assert(ctx != NULL); |
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| 308 | |
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| 309 | int size = abac_list_size(ctx->id_certs); |
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| 310 | |
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| 311 | // make the array (leave space to NULL terminate it) |
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| 312 | // n.b., even if the list is empty, we still return an array that |
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| 313 | // only contains the NULL terminator |
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| 314 | principals = abac_xmalloc(sizeof(abac_id_cert_t *) * (size + 1)); |
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| 315 | int i = 0; |
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| 316 | abac_id_cert_t *id_cert; |
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| 317 | abac_list_foreach(ctx->id_certs, id_cert, |
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| 318 | principals[i]=abac_id_cert_dup(id_cert); |
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| 319 | i++; |
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| 320 | ); |
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| 321 | principals[i] = NULL; |
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| 322 | |
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| 323 | return principals; |
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| 324 | } |
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| 325 | |
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| 326 | |
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[3c4fd68] | 327 | /** |
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| 328 | * Frees a NULL-terminated list of credentials. |
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| 329 | */ |
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| 330 | void abac_context_credentials_free(abac_credential_t **credentials) { |
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[dc62c68] | 331 | int i; |
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[90d20f0] | 332 | |
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[401a054] | 333 | if (credentials == NULL) |
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[90d20f0] | 334 | return; |
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| 335 | |
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[401a054] | 336 | for (i = 0; credentials[i] != NULL; ++i) |
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| 337 | abac_credential_free(credentials[i]); |
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| 338 | free(credentials); |
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[90d20f0] | 339 | } |
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[bec30b5] | 340 | |
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| 341 | /** |
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| 342 | * Frees a NULL-terminated list of id credentials |
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| 343 | */ |
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| 344 | void abac_context_id_credentials_free(abac_id_cert_t **id_credentials) { |
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| 345 | int i; |
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| 346 | |
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| 347 | if (id_credentials == NULL) |
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| 348 | return; |
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| 349 | |
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| 350 | for (i = 0; id_credentials[i] != NULL; ++i) { |
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| 351 | abac_id_cert_free(id_credentials[i]); |
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| 352 | } |
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| 353 | free(id_credentials); |
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| 354 | } |
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| 355 | |
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| 356 | |
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