[ba6027a] | 1 | |
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| 2 | /** |
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| 3 | ** abac_key.c |
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| 4 | ** holding a private_key |
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| 5 | **/ |
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| 6 | |
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| 7 | // include the GNU extension of asprintf |
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| 8 | #define _GNU_SOURCE |
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| 9 | |
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| 10 | #include <stdio.h> |
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| 11 | #include <time.h> |
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| 12 | #include <sys/types.h> |
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| 13 | #include <sys/stat.h> |
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| 14 | #include <unistd.h> |
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| 15 | #include <fcntl.h> |
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| 16 | #include <sys/mman.h> |
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| 17 | #include <assert.h> |
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| 18 | |
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| 19 | #include "abac_internal.h" |
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| 20 | #include "abac_util.h" |
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| 21 | |
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| 22 | extern chunk_t abac_get_potato_cb(int try, char *name); |
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| 23 | |
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| 24 | static int debug=0; |
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| 25 | // |
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| 26 | // abac_key object |
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| 27 | // |
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| 28 | // keyblob and potato are 'cleaned' explicitly |
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| 29 | struct _abac_key_t { |
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| 30 | chunk_t keyblob; |
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| 31 | char* filename; |
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| 32 | chunk_t potato; // you know what, just as a hint |
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| 33 | }; |
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| 34 | |
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| 35 | /****************************************************************/ |
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| 36 | // |
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| 37 | // Helper functions below |
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| 38 | // |
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| 39 | void print_abac_key(char *msg, abac_key_t *ptr) |
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| 40 | { |
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| 41 | printf("===============\n"); |
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| 42 | if(ptr->keyblob.len !=0) { |
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| 43 | printf("[%s]ptr:loc(%d)\n",msg,(int) ptr->keyblob.ptr); |
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| 44 | printf("[%s]len:(%d)\n",msg,ptr->keyblob.len); |
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| 45 | printf("[%s]strlen:(%d)\n",msg,strlen(ptr->keyblob.ptr)); |
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| 46 | if(strlen(ptr->keyblob.ptr) != ptr->keyblob.len) |
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| 47 | printf("BAD, did not match\b\n"); |
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| 48 | } |
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| 49 | if(ptr->filename) |
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| 50 | printf("[%s]filename:(%s)\n",msg,ptr->filename); |
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| 51 | if(ptr->potato.len !=0) { |
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| 52 | printf("[%s]pptr:loc(%d)\n",msg,(int)ptr->potato.ptr); |
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| 53 | printf("[%s]plen:(%d)\n",msg,ptr->potato.len); |
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| 54 | printf("[%s]pstrlen:(%d)\n",msg,strlen(ptr->potato.ptr)); |
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| 55 | } |
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| 56 | printf("===============\n"); |
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| 57 | } |
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| 58 | |
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| 59 | static private_key_t *_load_privkey_chunk(chunk_t chunk) |
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| 60 | { |
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| 61 | if(debug) { |
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[b92a620] | 62 | fprintf(stderr,"_load_privkey_chunk, ptr loc(%d):(%d)\n", |
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[ba6027a] | 63 | (int) chunk.ptr, chunk.len); |
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| 64 | } |
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| 65 | private_key_t *key = lib->creds->create(lib->creds, |
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| 66 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 67 | BUILD_BLOB_PEM, chunk, |
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| 68 | BUILD_END |
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| 69 | ); |
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| 70 | return key; |
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| 71 | } |
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| 72 | |
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| 73 | static private_key_t *_load_enc_privkey_chunk(chunk_t chunk, chunk_t potato) |
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| 74 | { |
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| 75 | if(debug) { |
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[b92a620] | 76 | fprintf(stderr,"_load_enc_privkey_chunk, ptr loc(%d):(%d)\n", |
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[ba6027a] | 77 | (int) chunk.ptr, chunk.len); |
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| 78 | } |
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| 79 | mem_cred_t *mem; |
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| 80 | shared_key_t *shared; |
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| 81 | |
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| 82 | mem = mem_cred_create(); |
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| 83 | lib->credmgr->add_set(lib->credmgr, &mem->set); |
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| 84 | shared = shared_key_create(SHARED_PRIVATE_KEY_PASS, chunk_clone(potato)); |
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| 85 | mem->add_shared(mem, shared, NULL); |
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| 86 | |
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| 87 | // load signer key |
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| 88 | private_key_t *key =_load_privkey_chunk(chunk); |
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| 89 | |
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| 90 | lib->credmgr->remove_set(lib->credmgr, &mem->set); |
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| 91 | mem->destroy(mem); |
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| 92 | |
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| 93 | return key; |
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| 94 | } |
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| 95 | |
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| 96 | private_key_t *abac_key_private_key(abac_key_t *ptr) |
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| 97 | { |
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| 98 | private_key_t *prv=NULL; |
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| 99 | if(ptr->potato.len !=0) { |
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| 100 | prv=_load_enc_privkey_chunk(ptr->keyblob, ptr->potato); |
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| 101 | } else { |
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| 102 | if(debug) |
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| 103 | print_abac_key("abac_key_private_key",ptr); |
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| 104 | prv=_load_privkey_chunk(ptr->keyblob); |
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| 105 | /* try to use callback to retrieve the potato token */ |
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| 106 | if(prv == NULL && ptr->filename) { |
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| 107 | chunk_t pp=abac_get_potato_cb(2, ptr->filename); |
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| 108 | if(pp.len != 0) { |
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| 109 | prv=_load_enc_privkey_chunk(ptr->keyblob, pp); |
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| 110 | ptr->potato=pp; |
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| 111 | } |
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| 112 | } |
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| 113 | } |
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| 114 | |
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| 115 | return prv; |
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| 116 | } |
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| 117 | |
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| 118 | chunk_t abac_key_load_privkey_file(char *filename) |
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| 119 | { |
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| 120 | chunk_t blob=chunk_empty; |
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| 121 | struct stat sb; |
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| 122 | void *addr; |
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| 123 | int fd; |
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| 124 | |
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| 125 | if(!file_exist(filename)) |
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| 126 | return chunk_empty; |
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| 127 | |
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| 128 | fd = open(filename, O_RDONLY); |
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| 129 | if (fd == -1) { |
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| 130 | printf("warning, can not open the %s\n",filename); |
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| 131 | return blob; |
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| 132 | } |
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| 133 | |
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| 134 | if (fstat(fd, &sb) == -1) { |
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| 135 | printf("warning, key file(%s) is empty\n",filename); |
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| 136 | close(fd); |
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| 137 | return blob; |
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| 138 | } |
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| 139 | |
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| 140 | addr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
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| 141 | if (addr == MAP_FAILED) { |
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| 142 | printf("warning, mapping '%s' failed\n", filename); |
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| 143 | close(fd); |
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| 144 | return blob; |
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| 145 | } |
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| 146 | |
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| 147 | blob.ptr=strndup(addr, sb.st_size); |
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| 148 | blob.len=sb.st_size; |
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| 149 | |
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| 150 | munmap(addr, sb.st_size); |
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| 151 | close(fd); |
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| 152 | return blob; |
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| 153 | } |
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| 154 | |
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| 155 | /** |
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| 156 | * Generate a private key. |
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| 157 | */ |
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| 158 | static chunk_t _generate_keyblob(void) { |
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| 159 | private_key_t *key=NULL; |
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| 160 | chunk_t encoding=chunk_empty; |
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| 161 | libabac_init(); |
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| 162 | |
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| 163 | // generate the key |
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| 164 | key = lib->creds->create( |
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| 165 | lib->creds, |
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| 166 | CRED_PRIVATE_KEY, KEY_RSA, |
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| 167 | BUILD_KEY_SIZE, 2048, |
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| 168 | BUILD_END |
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| 169 | ); |
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| 170 | if (key == NULL) |
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| 171 | errx(1, "Key generation failed"); |
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| 172 | |
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| 173 | int ret = key->get_encoding(key, PRIVKEY_PEM, &encoding); |
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| 174 | if (!ret) { |
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| 175 | DESTROY_IF(key); |
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| 176 | errx(1, "Couldn't encode private key"); |
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| 177 | } |
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| 178 | /* HACK.. it seems encoding ptr's string is often longer than |
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| 179 | encoding len */ |
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| 180 | char *new_ptr=strndup(encoding.ptr,encoding.len); |
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| 181 | free(encoding.ptr); |
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| 182 | encoding.ptr=new_ptr; |
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| 183 | DESTROY_IF(key); |
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| 184 | return encoding; |
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| 185 | } |
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| 186 | |
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| 187 | /** |
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| 188 | * Write the private key to a file. |
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| 189 | * Returns false if there's no private key loaded |
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| 190 | */ |
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| 191 | int abac_key_write_privkey(abac_key_t *key, FILE *out) { |
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| 192 | |
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| 193 | fwrite(key->keyblob.ptr, key->keyblob.len, 1, out); |
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| 194 | return 1; |
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| 195 | } |
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| 196 | |
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| 197 | /** |
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| 198 | * Get a PEM-encoded chunk representing the private key |
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| 199 | */ |
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| 200 | chunk_t abac_key_chunk(abac_key_t *ptr) { |
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| 201 | return ptr->keyblob; |
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| 202 | } |
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| 203 | |
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| 204 | /*****************************************************************/ |
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| 205 | /* load with a filename */ |
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| 206 | /* load with a filename and potato */ |
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| 207 | /* load with a chunk blob */ |
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| 208 | /* load with a chunk blob and a potato */ |
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| 209 | /*****************************************************************/ |
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| 210 | abac_key_t *abac_key_file_new(char *filename, chunk_t potato) |
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| 211 | { |
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| 212 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
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| 213 | if(potato.len != 0) |
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| 214 | ptr->potato=potato; |
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| 215 | else ptr->potato=chunk_empty; |
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| 216 | ptr->keyblob=abac_key_load_privkey_file(filename); |
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| 217 | ptr->filename=abac_xstrdup(filename); |
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| 218 | return ptr; |
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| 219 | } |
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| 220 | |
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| 221 | /* just use the keyblob, did not reallocate */ |
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| 222 | abac_key_t *abac_key_chunk_new(chunk_t keyblob, chunk_t potato) |
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| 223 | { |
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| 224 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
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| 225 | if(potato.len != 0) |
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| 226 | ptr->potato=potato; |
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| 227 | else ptr->potato=chunk_empty; |
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| 228 | ptr->keyblob=keyblob; |
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| 229 | ptr->filename=NULL; |
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| 230 | return ptr; |
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| 231 | } |
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| 232 | |
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| 233 | abac_key_t *abac_key_generate() |
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| 234 | { |
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| 235 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
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| 236 | ptr->potato=chunk_empty; |
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| 237 | ptr->filename=NULL; |
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| 238 | ptr->keyblob=_generate_keyblob(); |
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| 239 | return ptr; |
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| 240 | } |
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| 241 | |
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| 242 | void abac_key_free(abac_key_t *ptr) |
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| 243 | { |
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| 244 | if(ptr->potato.len != 0) |
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| 245 | chunk_clear(&ptr->potato); |
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| 246 | if(debug) { |
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[b92a620] | 247 | fprintf(stderr,"FREEEEE abac_key loc(%d)\n",(int)ptr->keyblob.ptr); |
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[ba6027a] | 248 | } |
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| 249 | chunk_clear(&ptr->keyblob); |
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| 250 | free(ptr); |
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| 251 | } |
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