Line data Source code
1 : /*
2 : * px.c
3 : * Various cryptographic stuff for PostgreSQL.
4 : *
5 : * Copyright (c) 2001 Marko Kreen
6 : * All rights reserved.
7 : *
8 : * Redistribution and use in source and binary forms, with or without
9 : * modification, are permitted provided that the following conditions
10 : * are met:
11 : * 1. Redistributions of source code must retain the above copyright
12 : * notice, this list of conditions and the following disclaimer.
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : *
17 : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 : * SUCH DAMAGE.
28 : *
29 : * contrib/pgcrypto/px.c
30 : */
31 :
32 : #include "postgres.h"
33 :
34 : #include "px.h"
35 :
36 : struct error_desc
37 : {
38 : int err;
39 : const char *desc;
40 : };
41 :
42 : static const struct error_desc px_err_list[] = {
43 : {PXE_OK, "Everything ok"},
44 : {PXE_NO_HASH, "No such hash algorithm"},
45 : {PXE_NO_CIPHER, "No such cipher algorithm"},
46 : {PXE_BAD_OPTION, "Unknown option"},
47 : {PXE_BAD_FORMAT, "Badly formatted type"},
48 : {PXE_KEY_TOO_BIG, "Key was too big"},
49 : {PXE_CIPHER_INIT, "Cipher cannot be initialized"},
50 : {PXE_HASH_UNUSABLE_FOR_HMAC, "This hash algorithm is unusable for HMAC"},
51 : {PXE_BUG, "pgcrypto bug"},
52 : {PXE_ARGUMENT_ERROR, "Illegal argument to function"},
53 : {PXE_UNKNOWN_SALT_ALGO, "Unknown salt algorithm"},
54 : {PXE_BAD_SALT_ROUNDS, "Incorrect number of rounds"},
55 : {PXE_NO_RANDOM, "Failed to generate strong random bits"},
56 : {PXE_DECRYPT_FAILED, "Decryption failed"},
57 : {PXE_ENCRYPT_FAILED, "Encryption failed"},
58 : {PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
59 : {PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
60 : {PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
61 : {PXE_PGP_UNSUPPORTED_CIPHER, "Unsupported cipher algorithm"},
62 : {PXE_PGP_UNSUPPORTED_HASH, "Unsupported digest algorithm"},
63 : {PXE_PGP_COMPRESSION_ERROR, "Compression error"},
64 : {PXE_PGP_NOT_TEXT, "Not text data"},
65 : {PXE_PGP_UNEXPECTED_PKT, "Unexpected packet in key data"},
66 : {PXE_PGP_MATH_FAILED, "Math operation failed"},
67 : {PXE_PGP_SHORT_ELGAMAL_KEY, "Elgamal keys must be at least 1024 bits long"},
68 : {PXE_PGP_UNKNOWN_PUBALGO, "Unknown public-key encryption algorithm"},
69 : {PXE_PGP_WRONG_KEY, "Wrong key"},
70 : {PXE_PGP_MULTIPLE_KEYS,
71 : "Several keys given - pgcrypto does not handle keyring"},
72 : {PXE_PGP_EXPECT_PUBLIC_KEY, "Refusing to encrypt with secret key"},
73 : {PXE_PGP_EXPECT_SECRET_KEY, "Cannot decrypt with public key"},
74 : {PXE_PGP_NOT_V4_KEYPKT, "Only V4 key packets are supported"},
75 : {PXE_PGP_KEYPKT_CORRUPT, "Corrupt key packet"},
76 : {PXE_PGP_NO_USABLE_KEY, "No encryption key found"},
77 : {PXE_PGP_NEED_SECRET_PSW, "Need password for secret key"},
78 : {PXE_PGP_BAD_S2K_MODE, "Bad S2K mode"},
79 : {PXE_PGP_UNSUPPORTED_PUBALGO, "Unsupported public key algorithm"},
80 : {PXE_PGP_MULTIPLE_SUBKEYS, "Several subkeys not supported"},
81 :
82 : {0, NULL},
83 : };
84 :
85 : /*
86 : * Call ereport(ERROR, ...), with an error code and message corresponding to
87 : * the PXE_* error code given as argument.
88 : *
89 : * This is similar to px_strerror(err), but for some errors, we fill in the
90 : * error code and detail fields more appropriately.
91 : */
92 : void
93 0 : px_THROW_ERROR(int err)
94 : {
95 0 : if (err == PXE_NO_RANDOM)
96 : {
97 0 : ereport(ERROR,
98 : (errcode(ERRCODE_INTERNAL_ERROR),
99 : errmsg("could not generate a random number")));
100 0 : }
101 : else
102 : {
103 : /* For other errors, use the message from the above list. */
104 0 : ereport(ERROR,
105 : (errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
106 : errmsg("%s", px_strerror(err))));
107 : }
108 0 : }
109 :
110 : const char *
111 0 : px_strerror(int err)
112 : {
113 0 : const struct error_desc *e;
114 :
115 0 : for (e = px_err_list; e->desc; e++)
116 0 : if (e->err == err)
117 0 : return e->desc;
118 0 : return "Bad error code";
119 0 : }
120 :
121 : /* memset that must not be optimized away */
122 : void
123 0 : px_memset(void *ptr, int c, size_t len)
124 : {
125 0 : memset(ptr, c, len);
126 0 : }
127 :
128 : const char *
129 0 : px_resolve_alias(const PX_Alias *list, const char *name)
130 : {
131 0 : while (list->name)
132 : {
133 0 : if (pg_strcasecmp(list->alias, name) == 0)
134 0 : return list->name;
135 0 : list++;
136 : }
137 0 : return name;
138 0 : }
139 :
140 : static void (*debug_handler) (const char *) = NULL;
141 :
142 : void
143 0 : px_set_debug_handler(void (*handler) (const char *))
144 : {
145 0 : debug_handler = handler;
146 0 : }
147 :
148 : void
149 0 : px_debug(const char *fmt,...)
150 : {
151 0 : va_list ap;
152 :
153 0 : va_start(ap, fmt);
154 0 : if (debug_handler)
155 : {
156 0 : char buf[512];
157 :
158 0 : vsnprintf(buf, sizeof(buf), fmt, ap);
159 0 : debug_handler(buf);
160 0 : }
161 0 : va_end(ap);
162 0 : }
163 :
164 : /*
165 : * combo - cipher + padding (+ checksum)
166 : */
167 :
168 : static unsigned
169 0 : combo_encrypt_len(PX_Combo *cx, unsigned dlen)
170 : {
171 0 : return dlen + 512;
172 : }
173 :
174 : static unsigned
175 0 : combo_decrypt_len(PX_Combo *cx, unsigned dlen)
176 : {
177 0 : return dlen;
178 : }
179 :
180 : static int
181 0 : combo_init(PX_Combo *cx, const uint8 *key, unsigned klen,
182 : const uint8 *iv, unsigned ivlen)
183 : {
184 0 : int err;
185 0 : unsigned ks,
186 : ivs;
187 0 : PX_Cipher *c = cx->cipher;
188 0 : uint8 *ivbuf = NULL;
189 0 : uint8 *keybuf;
190 :
191 0 : ks = px_cipher_key_size(c);
192 :
193 0 : ivs = px_cipher_iv_size(c);
194 0 : if (ivs > 0)
195 : {
196 0 : ivbuf = palloc0(ivs);
197 0 : if (ivlen > ivs)
198 0 : memcpy(ivbuf, iv, ivs);
199 0 : else if (ivlen > 0)
200 0 : memcpy(ivbuf, iv, ivlen);
201 0 : }
202 :
203 0 : if (klen > ks)
204 0 : klen = ks;
205 0 : keybuf = palloc0(ks);
206 0 : memcpy(keybuf, key, klen);
207 :
208 0 : err = px_cipher_init(c, keybuf, klen, ivbuf);
209 :
210 0 : if (ivbuf)
211 0 : pfree(ivbuf);
212 0 : pfree(keybuf);
213 :
214 0 : return err;
215 0 : }
216 :
217 : static int
218 0 : combo_encrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
219 : uint8 *res, unsigned *rlen)
220 : {
221 0 : return px_cipher_encrypt(cx->cipher, cx->padding, data, dlen, res, rlen);
222 : }
223 :
224 : static int
225 0 : combo_decrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
226 : uint8 *res, unsigned *rlen)
227 : {
228 0 : return px_cipher_decrypt(cx->cipher, cx->padding, data, dlen, res, rlen);
229 : }
230 :
231 : static void
232 0 : combo_free(PX_Combo *cx)
233 : {
234 0 : if (cx->cipher)
235 0 : px_cipher_free(cx->cipher);
236 0 : px_memset(cx, 0, sizeof(*cx));
237 0 : pfree(cx);
238 0 : }
239 :
240 : /* PARSER */
241 :
242 : static int
243 0 : parse_cipher_name(char *full, char **cipher, char **pad)
244 : {
245 0 : char *p,
246 : *p2,
247 : *q;
248 :
249 0 : *cipher = full;
250 0 : *pad = NULL;
251 :
252 0 : p = strchr(full, '/');
253 0 : if (p != NULL)
254 0 : *p++ = 0;
255 0 : while (p != NULL)
256 : {
257 0 : if ((q = strchr(p, '/')) != NULL)
258 0 : *q++ = 0;
259 :
260 0 : if (!*p)
261 : {
262 0 : p = q;
263 0 : continue;
264 : }
265 0 : p2 = strchr(p, ':');
266 0 : if (p2 != NULL)
267 : {
268 0 : *p2++ = 0;
269 0 : if (strcmp(p, "pad") == 0)
270 0 : *pad = p2;
271 : else
272 0 : return PXE_BAD_OPTION;
273 0 : }
274 : else
275 0 : return PXE_BAD_FORMAT;
276 :
277 0 : p = q;
278 : }
279 0 : return 0;
280 0 : }
281 :
282 : /* provider */
283 :
284 : int
285 0 : px_find_combo(const char *name, PX_Combo **res)
286 : {
287 0 : int err;
288 0 : char *buf,
289 : *s_cipher,
290 : *s_pad;
291 :
292 0 : PX_Combo *cx;
293 :
294 0 : cx = palloc0_object(PX_Combo);
295 0 : buf = pstrdup(name);
296 :
297 0 : err = parse_cipher_name(buf, &s_cipher, &s_pad);
298 0 : if (err)
299 : {
300 0 : pfree(buf);
301 0 : pfree(cx);
302 0 : return err;
303 : }
304 :
305 0 : err = px_find_cipher(s_cipher, &cx->cipher);
306 0 : if (err)
307 0 : goto err1;
308 :
309 0 : if (s_pad != NULL)
310 : {
311 0 : if (strcmp(s_pad, "pkcs") == 0)
312 0 : cx->padding = 1;
313 0 : else if (strcmp(s_pad, "none") == 0)
314 0 : cx->padding = 0;
315 : else
316 0 : goto err1;
317 0 : }
318 : else
319 0 : cx->padding = 1;
320 :
321 0 : cx->init = combo_init;
322 0 : cx->encrypt = combo_encrypt;
323 0 : cx->decrypt = combo_decrypt;
324 0 : cx->encrypt_len = combo_encrypt_len;
325 0 : cx->decrypt_len = combo_decrypt_len;
326 0 : cx->free = combo_free;
327 :
328 0 : pfree(buf);
329 :
330 0 : *res = cx;
331 :
332 0 : return 0;
333 :
334 : err1:
335 0 : if (cx->cipher)
336 0 : px_cipher_free(cx->cipher);
337 0 : pfree(cx);
338 0 : pfree(buf);
339 0 : return PXE_NO_CIPHER;
340 0 : }
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