1 | /** |
---|
2 | ** abac_key.c |
---|
3 | ** holding a private_key |
---|
4 | **/ |
---|
5 | #include <sys/types.h> |
---|
6 | #include <sys/stat.h> |
---|
7 | #include <unistd.h> |
---|
8 | #include <fcntl.h> |
---|
9 | #include <sys/mman.h> |
---|
10 | |
---|
11 | #include <credentials/keys/private_key.h> |
---|
12 | #include <credentials/sets/mem_cred.h> |
---|
13 | |
---|
14 | #include "abac_defines.h" |
---|
15 | #include "abac_util.h" |
---|
16 | |
---|
17 | static int debug=0; |
---|
18 | |
---|
19 | // abac_key object |
---|
20 | // keyblob and potato are 'cleaned' explicitly |
---|
21 | struct _abac_key_t { |
---|
22 | chunk_t keyblob; |
---|
23 | char* filename; |
---|
24 | chunk_t potato; // you know what, just as a hint |
---|
25 | }; |
---|
26 | |
---|
27 | /* from abac_util */ |
---|
28 | extern chunk_t abac_get_potato_cb(int, char*); |
---|
29 | |
---|
30 | /****************************************************************/ |
---|
31 | // |
---|
32 | // Helper functions below |
---|
33 | // |
---|
34 | void print_abac_key(char *msg, abac_key_t *ptr) |
---|
35 | { |
---|
36 | printf("===============\n"); |
---|
37 | if(ptr->keyblob.len !=0) { |
---|
38 | printf("[%s]ptr:loc(l%d)\n",msg,(long) ptr->keyblob.ptr); |
---|
39 | printf("[%s]len:(%d)\n",msg,ptr->keyblob.len); |
---|
40 | printf("[%s]strlen:(%d)\n",msg,strlen(ptr->keyblob.ptr)); |
---|
41 | if(strlen(ptr->keyblob.ptr) != ptr->keyblob.len) |
---|
42 | printf("BAD, did not match\b\n"); |
---|
43 | } |
---|
44 | if(ptr->filename) |
---|
45 | printf("[%s]filename:(%s)\n",msg,ptr->filename); |
---|
46 | if(ptr->potato.len !=0) { |
---|
47 | printf("[%s]pptr:loc(%ld)\n",msg,(long)ptr->potato.ptr); |
---|
48 | printf("[%s]plen:(%d)\n",msg,ptr->potato.len); |
---|
49 | printf("[%s]pstrlen:(%d)\n",msg,strlen(ptr->potato.ptr)); |
---|
50 | } |
---|
51 | printf("===============\n"); |
---|
52 | } |
---|
53 | |
---|
54 | static private_key_t *_load_privkey_chunk(chunk_t chunk) |
---|
55 | { |
---|
56 | DEBUG_PRINTF("_load_privkey_chunk, ptr loc(%d):(%d)\n", |
---|
57 | (int) chunk.ptr, chunk.len); |
---|
58 | private_key_t *key = lib->creds->create(lib->creds, |
---|
59 | CRED_PRIVATE_KEY, KEY_RSA, |
---|
60 | BUILD_BLOB_PEM, chunk, |
---|
61 | BUILD_END |
---|
62 | ); |
---|
63 | return key; |
---|
64 | } |
---|
65 | |
---|
66 | static private_key_t *_load_enc_privkey_chunk(chunk_t chunk, chunk_t potato) |
---|
67 | { |
---|
68 | DEBUG_PRINTF("_load_enc_privkey_chunk, ptr loc(%d):(%d)\n", |
---|
69 | (int) chunk.ptr, chunk.len); |
---|
70 | mem_cred_t *mem; |
---|
71 | shared_key_t *shared; |
---|
72 | |
---|
73 | mem = mem_cred_create(); |
---|
74 | lib->credmgr->add_set(lib->credmgr, &mem->set); |
---|
75 | shared = shared_key_create(SHARED_PRIVATE_KEY_PASS, chunk_clone(potato)); |
---|
76 | mem->add_shared(mem, shared, NULL); |
---|
77 | |
---|
78 | // load signer key |
---|
79 | private_key_t *key =_load_privkey_chunk(chunk); |
---|
80 | |
---|
81 | lib->credmgr->remove_set(lib->credmgr, &mem->set); |
---|
82 | mem->destroy(mem); |
---|
83 | |
---|
84 | return key; |
---|
85 | } |
---|
86 | |
---|
87 | private_key_t *abac_key_private_key(abac_key_t *ptr) |
---|
88 | { |
---|
89 | private_key_t *prv=NULL; |
---|
90 | if(ptr->potato.len !=0) { |
---|
91 | prv=_load_enc_privkey_chunk(ptr->keyblob, ptr->potato); |
---|
92 | } else { |
---|
93 | if(debug) |
---|
94 | print_abac_key("abac_key_private_key",ptr); |
---|
95 | prv=_load_privkey_chunk(ptr->keyblob); |
---|
96 | /* try to use callback to retrieve the potato token */ |
---|
97 | if(prv == NULL && ptr->filename) { |
---|
98 | chunk_t pp=abac_get_potato_cb(2, ptr->filename); |
---|
99 | if(pp.len != 0) { |
---|
100 | prv=_load_enc_privkey_chunk(ptr->keyblob, pp); |
---|
101 | ptr->potato=pp; |
---|
102 | } |
---|
103 | } |
---|
104 | } |
---|
105 | |
---|
106 | return prv; |
---|
107 | } |
---|
108 | |
---|
109 | chunk_t abac_key_load_privkey_file(char *filename) |
---|
110 | { |
---|
111 | chunk_t blob=chunk_empty; |
---|
112 | struct stat sb; |
---|
113 | void *addr; |
---|
114 | int fd; |
---|
115 | |
---|
116 | if(!file_exist(filename)) |
---|
117 | return chunk_empty; |
---|
118 | |
---|
119 | fd = open(filename, O_RDONLY); |
---|
120 | if (fd == -1) { |
---|
121 | printf("warning, can not open the %s\n",filename); |
---|
122 | return blob; |
---|
123 | } |
---|
124 | |
---|
125 | if (fstat(fd, &sb) == -1) { |
---|
126 | printf("warning, key file(%s) is empty\n",filename); |
---|
127 | close(fd); |
---|
128 | return blob; |
---|
129 | } |
---|
130 | |
---|
131 | addr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); |
---|
132 | if (addr == MAP_FAILED) { |
---|
133 | printf("warning, mapping '%s' failed\n", filename); |
---|
134 | close(fd); |
---|
135 | return blob; |
---|
136 | } |
---|
137 | |
---|
138 | blob.ptr=strndup(addr, sb.st_size); |
---|
139 | blob.len=sb.st_size; |
---|
140 | |
---|
141 | munmap(addr, sb.st_size); |
---|
142 | close(fd); |
---|
143 | return blob; |
---|
144 | } |
---|
145 | |
---|
146 | /** |
---|
147 | * Generate a private key. |
---|
148 | */ |
---|
149 | static chunk_t _generate_keyblob(void) { |
---|
150 | private_key_t *key=NULL; |
---|
151 | chunk_t encoding=chunk_empty; |
---|
152 | libabac_init(); |
---|
153 | |
---|
154 | // generate the key |
---|
155 | key = lib->creds->create( |
---|
156 | lib->creds, |
---|
157 | CRED_PRIVATE_KEY, KEY_RSA, |
---|
158 | BUILD_KEY_SIZE, 2048, |
---|
159 | BUILD_END |
---|
160 | ); |
---|
161 | if (key == NULL) |
---|
162 | errx(1, "Key generation failed"); |
---|
163 | |
---|
164 | int ret = key->get_encoding(key, PRIVKEY_PEM, &encoding); |
---|
165 | if (!ret) { |
---|
166 | DESTROY_IF(key); |
---|
167 | errx(1, "Couldn't encode private key"); |
---|
168 | } |
---|
169 | /* HACK.. it seems encoding ptr's string is often longer than |
---|
170 | encoding len */ |
---|
171 | char *new_ptr=strndup(encoding.ptr,encoding.len); |
---|
172 | free(encoding.ptr); |
---|
173 | encoding.ptr=new_ptr; |
---|
174 | DESTROY_IF(key); |
---|
175 | return encoding; |
---|
176 | } |
---|
177 | |
---|
178 | /** |
---|
179 | * Write the private key to a file. |
---|
180 | * Returns false if there's no private key loaded |
---|
181 | */ |
---|
182 | int abac_key_write_privkey(abac_key_t *key, FILE *out) { |
---|
183 | |
---|
184 | fwrite(key->keyblob.ptr, key->keyblob.len, 1, out); |
---|
185 | return 1; |
---|
186 | } |
---|
187 | |
---|
188 | /** |
---|
189 | * Get a PEM-encoded chunk representing the private key |
---|
190 | */ |
---|
191 | chunk_t abac_key_chunk(abac_key_t *ptr) { |
---|
192 | return ptr->keyblob; |
---|
193 | } |
---|
194 | |
---|
195 | /*****************************************************************/ |
---|
196 | /* load with a filename */ |
---|
197 | /* load with a filename and potato */ |
---|
198 | /* load with a chunk blob */ |
---|
199 | /* load with a chunk blob and a potato */ |
---|
200 | /*****************************************************************/ |
---|
201 | abac_key_t *abac_key_file_new(char *filename, chunk_t potato) |
---|
202 | { |
---|
203 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
---|
204 | if(potato.len != 0) |
---|
205 | ptr->potato=potato; |
---|
206 | else ptr->potato=chunk_empty; |
---|
207 | ptr->keyblob=abac_key_load_privkey_file(filename); |
---|
208 | ptr->filename=abac_xstrdup(filename); |
---|
209 | return ptr; |
---|
210 | } |
---|
211 | |
---|
212 | /* just use the keyblob, did not reallocate */ |
---|
213 | abac_key_t *abac_key_chunk_new(chunk_t keyblob, chunk_t potato) |
---|
214 | { |
---|
215 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
---|
216 | if(potato.len != 0) |
---|
217 | ptr->potato=potato; |
---|
218 | else ptr->potato=chunk_empty; |
---|
219 | ptr->keyblob=keyblob; |
---|
220 | ptr->filename=NULL; |
---|
221 | return ptr; |
---|
222 | } |
---|
223 | |
---|
224 | abac_key_t *abac_key_generate() |
---|
225 | { |
---|
226 | abac_key_t *ptr = abac_xmalloc(sizeof(abac_key_t)); |
---|
227 | ptr->potato=chunk_empty; |
---|
228 | ptr->filename=NULL; |
---|
229 | ptr->keyblob=_generate_keyblob(); |
---|
230 | return ptr; |
---|
231 | } |
---|
232 | |
---|
233 | static chunk_t _copy(chunk_t ptr) |
---|
234 | { |
---|
235 | chunk_t blob=chunk_empty; |
---|
236 | blob.ptr=strndup(ptr.ptr, ptr.len); |
---|
237 | blob.len=ptr.len; |
---|
238 | return blob; |
---|
239 | } |
---|
240 | |
---|
241 | |
---|
242 | abac_key_t *abac_key_copy(abac_key_t *ptr) |
---|
243 | { |
---|
244 | abac_key_t *nptr = abac_xmalloc(sizeof(abac_key_t)); |
---|
245 | |
---|
246 | if(ptr->potato.len==0) |
---|
247 | nptr->potato=chunk_empty; |
---|
248 | else nptr->potato=_copy(ptr->potato); |
---|
249 | |
---|
250 | if(ptr->filename!=NULL) |
---|
251 | nptr->filename=abac_xstrdup(ptr->filename); |
---|
252 | else nptr->filename=NULL; |
---|
253 | |
---|
254 | if(ptr->keyblob.len==0) |
---|
255 | nptr->keyblob=chunk_empty; |
---|
256 | else nptr->keyblob=_copy(ptr->keyblob); |
---|
257 | return nptr; |
---|
258 | } |
---|
259 | |
---|
260 | void abac_key_free(abac_key_t *ptr) |
---|
261 | { |
---|
262 | if(ptr->potato.len != 0) { |
---|
263 | chunk_clear(&ptr->potato); |
---|
264 | } |
---|
265 | if(ptr->keyblob.len !=0) { |
---|
266 | chunk_clear(&ptr->keyblob); |
---|
267 | } |
---|
268 | if(ptr->filename!=NULL) |
---|
269 | free(ptr->filename); |
---|
270 | free(ptr); |
---|
271 | } |
---|