3eca8453 |
1 | /* |
a52f067e |
2 | * Generic SSH public-key handling operations. In particular, |
3 | * reading of SSH public-key files, and also the generic `sign' |
4 | * operation for ssh2 (which checks the type of the key and |
5 | * dispatches to the appropriate key-type specific function). |
3eca8453 |
6 | */ |
7 | |
8 | #include <stdio.h> |
a52f067e |
9 | #include <stdlib.h> |
65a22376 |
10 | #include <assert.h> |
3eca8453 |
11 | |
9a30e26b |
12 | #include "putty.h" |
3eca8453 |
13 | #include "ssh.h" |
7bedb13c |
14 | #include "misc.h" |
3eca8453 |
15 | |
6e522441 |
16 | #define PUT_32BIT(cp, value) do { \ |
17 | (cp)[3] = (value); \ |
18 | (cp)[2] = (value) >> 8; \ |
19 | (cp)[1] = (value) >> 16; \ |
20 | (cp)[0] = (value) >> 24; } while (0) |
21 | |
3eca8453 |
22 | #define GET_32BIT(cp) \ |
23 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
24 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
25 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
26 | ((unsigned long)(unsigned char)(cp)[3])) |
27 | |
28 | #define rsa_signature "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
29 | |
a52f067e |
30 | #define BASE64_TOINT(x) ( (x)-'A'<26 ? (x)-'A'+0 :\ |
31 | (x)-'a'<26 ? (x)-'a'+26 :\ |
32 | (x)-'0'<10 ? (x)-'0'+52 :\ |
33 | (x)=='+' ? 62 : \ |
34 | (x)=='/' ? 63 : 0 ) |
35 | |
3f2d010c |
36 | static int loadrsakey_main(FILE * fp, struct RSAKey *key, int pub_only, |
32874aea |
37 | char **commentptr, char *passphrase) |
38 | { |
3eca8453 |
39 | unsigned char buf[16384]; |
40 | unsigned char keybuf[16]; |
41 | int len; |
42 | int i, j, ciphertype; |
43 | int ret = 0; |
44 | struct MD5Context md5c; |
a52f067e |
45 | char *comment; |
3eca8453 |
46 | |
a52f067e |
47 | /* Slurp the whole file (minus the header) into a buffer. */ |
3eca8453 |
48 | len = fread(buf, 1, sizeof(buf), fp); |
49 | fclose(fp); |
50 | if (len < 0 || len == sizeof(buf)) |
32874aea |
51 | goto end; /* file too big or not read */ |
3eca8453 |
52 | |
a52f067e |
53 | i = 0; |
3eca8453 |
54 | |
a52f067e |
55 | /* |
56 | * A zero byte. (The signature includes a terminating NUL.) |
57 | */ |
32874aea |
58 | if (len - i < 1 || buf[i] != 0) |
59 | goto end; |
a52f067e |
60 | i++; |
3eca8453 |
61 | |
a52f067e |
62 | /* One byte giving encryption type, and one reserved uint32. */ |
32874aea |
63 | if (len - i < 1) |
64 | goto end; |
3eca8453 |
65 | ciphertype = buf[i]; |
66 | if (ciphertype != 0 && ciphertype != SSH_CIPHER_3DES) |
32874aea |
67 | goto end; |
3eca8453 |
68 | i++; |
32874aea |
69 | if (len - i < 4) |
70 | goto end; /* reserved field not present */ |
71 | if (buf[i] != 0 || buf[i + 1] != 0 || buf[i + 2] != 0 |
72 | || buf[i + 3] != 0) goto end; /* reserved field nonzero, panic! */ |
3eca8453 |
73 | i += 4; |
74 | |
75 | /* Now the serious stuff. An ordinary SSH 1 public key. */ |
32874aea |
76 | i += makekey(buf + i, key, NULL, 1); |
77 | if (len - i < 0) |
78 | goto end; /* overran */ |
3eca8453 |
79 | |
3f2d010c |
80 | if (pub_only) { |
81 | ret = 1; |
82 | goto end; |
83 | } |
84 | |
3eca8453 |
85 | /* Next, the comment field. */ |
32874aea |
86 | j = GET_32BIT(buf + i); |
5c58ad2d |
87 | i += 4; |
32874aea |
88 | if (len - i < j) |
89 | goto end; |
3d88e64d |
90 | comment = snewn(j + 1, char); |
a52f067e |
91 | if (comment) { |
32874aea |
92 | memcpy(comment, buf + i, j); |
93 | comment[j] = '\0'; |
5c58ad2d |
94 | } |
95 | i += j; |
a52f067e |
96 | if (commentptr) |
32874aea |
97 | *commentptr = comment; |
a52f067e |
98 | if (key) |
32874aea |
99 | key->comment = comment; |
a52f067e |
100 | if (!key) { |
32874aea |
101 | return ciphertype != 0; |
a52f067e |
102 | } |
3eca8453 |
103 | |
104 | /* |
105 | * Decrypt remainder of buffer. |
106 | */ |
107 | if (ciphertype) { |
32874aea |
108 | MD5Init(&md5c); |
2247e107 |
109 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
110 | MD5Final(keybuf, &md5c); |
111 | des3_decrypt_pubkey(keybuf, buf + i, (len - i + 7) & ~7); |
112 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
3eca8453 |
113 | } |
114 | |
115 | /* |
116 | * We are now in the secret part of the key. The first four |
117 | * bytes should be of the form a, b, a, b. |
118 | */ |
32874aea |
119 | if (len - i < 4) |
120 | goto end; |
121 | if (buf[i] != buf[i + 2] || buf[i + 1] != buf[i + 3]) { |
122 | ret = -1; |
123 | goto end; |
124 | } |
3eca8453 |
125 | i += 4; |
126 | |
127 | /* |
128 | * After that, we have one further bignum which is our |
6e522441 |
129 | * decryption exponent, and then the three auxiliary values |
130 | * (iqmp, q, p). |
3eca8453 |
131 | */ |
32874aea |
132 | i += makeprivate(buf + i, key); |
133 | if (len - i < 0) |
134 | goto end; |
135 | i += ssh1_read_bignum(buf + i, &key->iqmp); |
136 | if (len - i < 0) |
137 | goto end; |
138 | i += ssh1_read_bignum(buf + i, &key->q); |
139 | if (len - i < 0) |
140 | goto end; |
141 | i += ssh1_read_bignum(buf + i, &key->p); |
142 | if (len - i < 0) |
143 | goto end; |
3eca8453 |
144 | |
98f022f5 |
145 | if (!rsa_verify(key)) { |
146 | freersakey(key); |
147 | ret = 0; |
148 | } else |
149 | ret = 1; |
150 | |
32874aea |
151 | end: |
3eca8453 |
152 | memset(buf, 0, sizeof(buf)); /* burn the evidence */ |
153 | return ret; |
154 | } |
155 | |
9a30e26b |
156 | int loadrsakey(const Filename *filename, struct RSAKey *key, char *passphrase) |
32874aea |
157 | { |
3eca8453 |
158 | FILE *fp; |
2247e107 |
159 | char buf[64]; |
3eca8453 |
160 | |
9a30e26b |
161 | fp = f_open(*filename, "rb"); |
3eca8453 |
162 | if (!fp) |
32874aea |
163 | return 0; /* doesn't even exist */ |
3eca8453 |
164 | |
a52f067e |
165 | /* |
166 | * Read the first line of the file and see if it's a v1 private |
167 | * key file. |
168 | */ |
32874aea |
169 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
3f2d010c |
170 | return loadrsakey_main(fp, key, FALSE, NULL, passphrase); |
a52f067e |
171 | } |
172 | |
173 | /* |
174 | * Otherwise, we have nothing. Return empty-handed. |
175 | */ |
3eca8453 |
176 | fclose(fp); |
3eca8453 |
177 | return 0; |
178 | } |
a52f067e |
179 | |
180 | /* |
181 | * See whether an RSA key is encrypted. Return its comment field as |
182 | * well. |
183 | */ |
9a30e26b |
184 | int rsakey_encrypted(const Filename *filename, char **comment) |
32874aea |
185 | { |
a52f067e |
186 | FILE *fp; |
2247e107 |
187 | char buf[64]; |
a52f067e |
188 | |
9a30e26b |
189 | fp = f_open(*filename, "rb"); |
a52f067e |
190 | if (!fp) |
32874aea |
191 | return 0; /* doesn't even exist */ |
a52f067e |
192 | |
193 | /* |
194 | * Read the first line of the file and see if it's a v1 private |
195 | * key file. |
196 | */ |
32874aea |
197 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
3f2d010c |
198 | return loadrsakey_main(fp, NULL, FALSE, comment, NULL); |
a52f067e |
199 | } |
404f728b |
200 | fclose(fp); |
32874aea |
201 | return 0; /* wasn't the right kind of file */ |
a52f067e |
202 | } |
6e522441 |
203 | |
204 | /* |
3f2d010c |
205 | * Return a malloc'ed chunk of memory containing the public blob of |
206 | * an RSA key, as given in the agent protocol (modulus bits, |
207 | * exponent, modulus). |
208 | */ |
9a30e26b |
209 | int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen) |
3f2d010c |
210 | { |
211 | FILE *fp; |
2247e107 |
212 | char buf[64]; |
3f2d010c |
213 | struct RSAKey key; |
214 | int ret; |
215 | |
216 | /* Default return if we fail. */ |
217 | *blob = NULL; |
218 | *bloblen = 0; |
219 | ret = 0; |
220 | |
9a30e26b |
221 | fp = f_open(*filename, "rb"); |
3f2d010c |
222 | if (!fp) |
223 | return 0; /* doesn't even exist */ |
224 | |
225 | /* |
226 | * Read the first line of the file and see if it's a v1 private |
227 | * key file. |
228 | */ |
229 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
230 | memset(&key, 0, sizeof(key)); |
231 | if (loadrsakey_main(fp, &key, TRUE, NULL, NULL)) { |
232 | *blob = rsa_public_blob(&key, bloblen); |
233 | freersakey(&key); |
234 | ret = 1; |
235 | } |
236 | } |
237 | fclose(fp); |
238 | return ret; |
239 | } |
240 | |
241 | /* |
6e522441 |
242 | * Save an RSA key file. Return nonzero on success. |
243 | */ |
9a30e26b |
244 | int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase) |
32874aea |
245 | { |
6e522441 |
246 | unsigned char buf[16384]; |
247 | unsigned char keybuf[16]; |
248 | struct MD5Context md5c; |
49bad831 |
249 | unsigned char *p, *estart; |
6e522441 |
250 | FILE *fp; |
251 | |
252 | /* |
253 | * Write the initial signature. |
254 | */ |
255 | p = buf; |
256 | memcpy(p, rsa_signature, sizeof(rsa_signature)); |
257 | p += sizeof(rsa_signature); |
258 | |
259 | /* |
260 | * One byte giving encryption type, and one reserved (zero) |
261 | * uint32. |
262 | */ |
263 | *p++ = (passphrase ? SSH_CIPHER_3DES : 0); |
32874aea |
264 | PUT_32BIT(p, 0); |
265 | p += 4; |
6e522441 |
266 | |
267 | /* |
268 | * An ordinary SSH 1 public key consists of: a uint32 |
269 | * containing the bit count, then two bignums containing the |
270 | * modulus and exponent respectively. |
271 | */ |
32874aea |
272 | PUT_32BIT(p, bignum_bitcount(key->modulus)); |
273 | p += 4; |
6e522441 |
274 | p += ssh1_write_bignum(p, key->modulus); |
275 | p += ssh1_write_bignum(p, key->exponent); |
276 | |
277 | /* |
278 | * A string containing the comment field. |
279 | */ |
280 | if (key->comment) { |
32874aea |
281 | PUT_32BIT(p, strlen(key->comment)); |
282 | p += 4; |
283 | memcpy(p, key->comment, strlen(key->comment)); |
284 | p += strlen(key->comment); |
6e522441 |
285 | } else { |
32874aea |
286 | PUT_32BIT(p, 0); |
287 | p += 4; |
6e522441 |
288 | } |
289 | |
290 | /* |
291 | * The encrypted portion starts here. |
292 | */ |
293 | estart = p; |
294 | |
295 | /* |
296 | * Two bytes, then the same two bytes repeated. |
297 | */ |
298 | *p++ = random_byte(); |
299 | *p++ = random_byte(); |
32874aea |
300 | p[0] = p[-2]; |
301 | p[1] = p[-1]; |
302 | p += 2; |
6e522441 |
303 | |
304 | /* |
305 | * Four more bignums: the decryption exponent, then iqmp, then |
306 | * q, then p. |
307 | */ |
308 | p += ssh1_write_bignum(p, key->private_exponent); |
65a22376 |
309 | p += ssh1_write_bignum(p, key->iqmp); |
310 | p += ssh1_write_bignum(p, key->q); |
311 | p += ssh1_write_bignum(p, key->p); |
6e522441 |
312 | |
313 | /* |
314 | * Now write zeros until the encrypted portion is a multiple of |
315 | * 8 bytes. |
316 | */ |
32874aea |
317 | while ((p - estart) % 8) |
318 | *p++ = '\0'; |
6e522441 |
319 | |
320 | /* |
321 | * Now encrypt the encrypted portion. |
322 | */ |
323 | if (passphrase) { |
32874aea |
324 | MD5Init(&md5c); |
2247e107 |
325 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
326 | MD5Final(keybuf, &md5c); |
327 | des3_encrypt_pubkey(keybuf, estart, p - estart); |
328 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
6e522441 |
329 | } |
330 | |
331 | /* |
332 | * Done. Write the result to the file. |
333 | */ |
9a30e26b |
334 | fp = f_open(*filename, "wb"); |
6e522441 |
335 | if (fp) { |
32874aea |
336 | int ret = (fwrite(buf, 1, p - buf, fp) == (size_t) (p - buf)); |
337 | ret = ret && (fclose(fp) == 0); |
338 | return ret; |
6e522441 |
339 | } else |
32874aea |
340 | return 0; |
6e522441 |
341 | } |
65a22376 |
342 | |
343 | /* ---------------------------------------------------------------------- |
344 | * SSH2 private key load/store functions. |
345 | */ |
346 | |
347 | /* |
348 | * PuTTY's own format for SSH2 keys is as follows: |
5c72ca61 |
349 | * |
65a22376 |
350 | * The file is text. Lines are terminated by CRLF, although CR-only |
351 | * and LF-only are tolerated on input. |
5c72ca61 |
352 | * |
7bedb13c |
353 | * The first line says "PuTTY-User-Key-File-2: " plus the name of the |
5c72ca61 |
354 | * algorithm ("ssh-dss", "ssh-rsa" etc). |
355 | * |
65a22376 |
356 | * The next line says "Encryption: " plus an encryption type. |
357 | * Currently the only supported encryption types are "aes256-cbc" |
358 | * and "none". |
5c72ca61 |
359 | * |
65a22376 |
360 | * The next line says "Comment: " plus the comment string. |
5c72ca61 |
361 | * |
65a22376 |
362 | * Next there is a line saying "Public-Lines: " plus a number N. |
363 | * The following N lines contain a base64 encoding of the public |
364 | * part of the key. This is encoded as the standard SSH2 public key |
365 | * blob (with no initial length): so for RSA, for example, it will |
366 | * read |
5c72ca61 |
367 | * |
65a22376 |
368 | * string "ssh-rsa" |
369 | * mpint exponent |
370 | * mpint modulus |
5c72ca61 |
371 | * |
65a22376 |
372 | * Next, there is a line saying "Private-Lines: " plus a number N, |
373 | * and then N lines containing the (potentially encrypted) private |
374 | * part of the key. For the key type "ssh-rsa", this will be |
375 | * composed of |
5c72ca61 |
376 | * |
65a22376 |
377 | * mpint private_exponent |
378 | * mpint p (the larger of the two primes) |
379 | * mpint q (the smaller prime) |
380 | * mpint iqmp (the inverse of q modulo p) |
381 | * data padding (to reach a multiple of the cipher block size) |
5c72ca61 |
382 | * |
383 | * And for "ssh-dss", it will be composed of |
384 | * |
385 | * mpint x (the private key parameter) |
7bedb13c |
386 | * [ string hash 20-byte hash of mpints p || q || g only in old format ] |
5c72ca61 |
387 | * |
7bedb13c |
388 | * Finally, there is a line saying "Private-MAC: " plus a hex |
389 | * representation of a HMAC-SHA-1 of: |
390 | * |
391 | * string name of algorithm ("ssh-dss", "ssh-rsa") |
392 | * string encryption type |
393 | * string comment |
394 | * string public-blob |
395 | * string private-plaintext (the plaintext version of the |
396 | * private part, including the final |
397 | * padding) |
65a22376 |
398 | * |
5c72ca61 |
399 | * The key to the MAC is itself a SHA-1 hash of: |
65a22376 |
400 | * |
5c72ca61 |
401 | * data "putty-private-key-file-mac-key" |
402 | * data passphrase |
403 | * |
404 | * Encrypted keys should have a MAC, whereas unencrypted ones must |
405 | * have a hash. |
406 | * |
65a22376 |
407 | * If the key is encrypted, the encryption key is derived from the |
408 | * passphrase by means of a succession of SHA-1 hashes. Each hash |
409 | * is the hash of: |
5c72ca61 |
410 | * |
65a22376 |
411 | * uint32 sequence-number |
5c72ca61 |
412 | * data passphrase |
413 | * |
65a22376 |
414 | * where the sequence-number increases from zero. As many of these |
415 | * hashes are used as necessary. |
5c72ca61 |
416 | * |
7bedb13c |
417 | * For backwards compatibility with snapshots between 0.51 and |
418 | * 0.52, we also support the older key file format, which begins |
419 | * with "PuTTY-User-Key-File-1" (version number differs). In this |
420 | * format the Private-MAC: field only covers the private-plaintext |
421 | * field and nothing else (and without the 4-byte string length on |
422 | * the front too). Moreover, for RSA keys the Private-MAC: field |
423 | * can be replaced with a Private-Hash: field which is a plain |
424 | * SHA-1 hash instead of an HMAC. This is not allowable in DSA |
425 | * keys. (Yes, the old format was a mess. Guess why it changed :-) |
65a22376 |
426 | */ |
427 | |
32874aea |
428 | static int read_header(FILE * fp, char *header) |
429 | { |
65a22376 |
430 | int len = 39; |
431 | int c; |
432 | |
433 | while (len > 0) { |
434 | c = fgetc(fp); |
435 | if (c == '\n' || c == '\r' || c == EOF) |
436 | return 0; /* failure */ |
437 | if (c == ':') { |
438 | c = fgetc(fp); |
439 | if (c != ' ') |
440 | return 0; |
441 | *header = '\0'; |
442 | return 1; /* success! */ |
443 | } |
444 | if (len == 0) |
445 | return 0; /* failure */ |
446 | *header++ = c; |
447 | len--; |
448 | } |
449 | return 0; /* failure */ |
450 | } |
451 | |
32874aea |
452 | static char *read_body(FILE * fp) |
453 | { |
65a22376 |
454 | char *text; |
455 | int len; |
456 | int size; |
457 | int c; |
458 | |
459 | size = 128; |
3d88e64d |
460 | text = snewn(size, char); |
65a22376 |
461 | len = 0; |
462 | text[len] = '\0'; |
463 | |
464 | while (1) { |
465 | c = fgetc(fp); |
466 | if (c == '\r' || c == '\n') { |
467 | c = fgetc(fp); |
468 | if (c != '\r' && c != '\n' && c != EOF) |
469 | ungetc(c, fp); |
470 | return text; |
471 | } |
472 | if (c == EOF) { |
473 | sfree(text); |
474 | return NULL; |
475 | } |
476 | if (len + 1 > size) { |
477 | size += 128; |
3d88e64d |
478 | text = sresize(text, size, char); |
65a22376 |
479 | } |
480 | text[len++] = c; |
481 | text[len] = '\0'; |
482 | } |
483 | } |
484 | |
32874aea |
485 | int base64_decode_atom(char *atom, unsigned char *out) |
486 | { |
65a22376 |
487 | int vals[4]; |
488 | int i, v, len; |
489 | unsigned word; |
490 | char c; |
32874aea |
491 | |
65a22376 |
492 | for (i = 0; i < 4; i++) { |
493 | c = atom[i]; |
494 | if (c >= 'A' && c <= 'Z') |
495 | v = c - 'A'; |
496 | else if (c >= 'a' && c <= 'z') |
497 | v = c - 'a' + 26; |
498 | else if (c >= '0' && c <= '9') |
499 | v = c - '0' + 52; |
500 | else if (c == '+') |
501 | v = 62; |
502 | else if (c == '/') |
503 | v = 63; |
504 | else if (c == '=') |
505 | v = -1; |
506 | else |
507 | return 0; /* invalid atom */ |
508 | vals[i] = v; |
509 | } |
510 | |
511 | if (vals[0] == -1 || vals[1] == -1) |
512 | return 0; |
513 | if (vals[2] == -1 && vals[3] != -1) |
514 | return 0; |
515 | |
516 | if (vals[3] != -1) |
517 | len = 3; |
518 | else if (vals[2] != -1) |
519 | len = 2; |
520 | else |
521 | len = 1; |
522 | |
523 | word = ((vals[0] << 18) | |
32874aea |
524 | (vals[1] << 12) | ((vals[2] & 0x3F) << 6) | (vals[3] & 0x3F)); |
65a22376 |
525 | out[0] = (word >> 16) & 0xFF; |
526 | if (len > 1) |
527 | out[1] = (word >> 8) & 0xFF; |
528 | if (len > 2) |
529 | out[2] = word & 0xFF; |
530 | return len; |
531 | } |
532 | |
2247e107 |
533 | static unsigned char *read_blob(FILE * fp, int nlines, int *bloblen) |
32874aea |
534 | { |
65a22376 |
535 | unsigned char *blob; |
536 | char *line; |
537 | int linelen, len; |
538 | int i, j, k; |
539 | |
540 | /* We expect at most 64 base64 characters, ie 48 real bytes, per line. */ |
3d88e64d |
541 | blob = snewn(48 * nlines, unsigned char); |
65a22376 |
542 | len = 0; |
543 | for (i = 0; i < nlines; i++) { |
544 | line = read_body(fp); |
545 | if (!line) { |
546 | sfree(blob); |
547 | return NULL; |
548 | } |
549 | linelen = strlen(line); |
550 | if (linelen % 4 != 0 || linelen > 64) { |
551 | sfree(blob); |
552 | sfree(line); |
553 | return NULL; |
554 | } |
555 | for (j = 0; j < linelen; j += 4) { |
32874aea |
556 | k = base64_decode_atom(line + j, blob + len); |
65a22376 |
557 | if (!k) { |
558 | sfree(line); |
559 | sfree(blob); |
560 | return NULL; |
561 | } |
562 | len += k; |
563 | } |
564 | sfree(line); |
565 | } |
566 | *bloblen = len; |
567 | return blob; |
568 | } |
569 | |
570 | /* |
571 | * Magic error return value for when the passphrase is wrong. |
572 | */ |
573 | struct ssh2_userkey ssh2_wrong_passphrase = { |
574 | NULL, NULL, NULL |
575 | }; |
576 | |
9a30e26b |
577 | struct ssh2_userkey *ssh2_load_userkey(const Filename *filename, |
578 | char *passphrase) |
32874aea |
579 | { |
65a22376 |
580 | FILE *fp; |
7bedb13c |
581 | char header[40], *b, *encryption, *comment, *mac; |
65a22376 |
582 | const struct ssh_signkey *alg; |
583 | struct ssh2_userkey *ret; |
584 | int cipher, cipherblk; |
585 | unsigned char *public_blob, *private_blob; |
586 | int public_blob_len, private_blob_len; |
7bedb13c |
587 | int i, is_mac, old_fmt; |
5c72ca61 |
588 | int passlen = passphrase ? strlen(passphrase) : 0; |
65a22376 |
589 | |
590 | ret = NULL; /* return NULL for most errors */ |
f545e34b |
591 | encryption = comment = mac = NULL; |
65a22376 |
592 | public_blob = private_blob = NULL; |
593 | |
9a30e26b |
594 | fp = f_open(*filename, "rb"); |
65a22376 |
595 | if (!fp) |
596 | goto error; |
597 | |
598 | /* Read the first header line which contains the key type. */ |
7bedb13c |
599 | if (!read_header(fp, header)) |
600 | goto error; |
601 | if (0 == strcmp(header, "PuTTY-User-Key-File-2")) { |
602 | old_fmt = 0; |
603 | } else if (0 == strcmp(header, "PuTTY-User-Key-File-1")) { |
604 | /* this is an old key file; warn and then continue */ |
605 | old_keyfile_warning(); |
606 | old_fmt = 1; |
607 | } else |
65a22376 |
608 | goto error; |
609 | if ((b = read_body(fp)) == NULL) |
610 | goto error; |
5c72ca61 |
611 | /* Select key algorithm structure. */ |
65a22376 |
612 | if (!strcmp(b, "ssh-rsa")) |
613 | alg = &ssh_rsa; |
5c72ca61 |
614 | else if (!strcmp(b, "ssh-dss")) |
615 | alg = &ssh_dss; |
65a22376 |
616 | else { |
617 | sfree(b); |
618 | goto error; |
619 | } |
620 | sfree(b); |
32874aea |
621 | |
65a22376 |
622 | /* Read the Encryption header line. */ |
32874aea |
623 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
65a22376 |
624 | goto error; |
7bedb13c |
625 | if ((encryption = read_body(fp)) == NULL) |
65a22376 |
626 | goto error; |
7bedb13c |
627 | if (!strcmp(encryption, "aes256-cbc")) { |
32874aea |
628 | cipher = 1; |
629 | cipherblk = 16; |
7bedb13c |
630 | } else if (!strcmp(encryption, "none")) { |
32874aea |
631 | cipher = 0; |
632 | cipherblk = 1; |
65a22376 |
633 | } else { |
7bedb13c |
634 | sfree(encryption); |
65a22376 |
635 | goto error; |
636 | } |
65a22376 |
637 | |
638 | /* Read the Comment header line. */ |
32874aea |
639 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
640 | goto error; |
641 | if ((comment = read_body(fp)) == NULL) |
642 | goto error; |
643 | |
644 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
645 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
646 | goto error; |
647 | if ((b = read_body(fp)) == NULL) |
648 | goto error; |
649 | i = atoi(b); |
650 | sfree(b); |
651 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
652 | goto error; |
653 | |
654 | /* Read the Private-Lines header line and the Private blob. */ |
32874aea |
655 | if (!read_header(fp, header) || 0 != strcmp(header, "Private-Lines")) |
65a22376 |
656 | goto error; |
657 | if ((b = read_body(fp)) == NULL) |
658 | goto error; |
659 | i = atoi(b); |
660 | sfree(b); |
661 | if ((private_blob = read_blob(fp, i, &private_blob_len)) == NULL) |
662 | goto error; |
663 | |
5c72ca61 |
664 | /* Read the Private-MAC or Private-Hash header line. */ |
665 | if (!read_header(fp, header)) |
65a22376 |
666 | goto error; |
5c72ca61 |
667 | if (0 == strcmp(header, "Private-MAC")) { |
668 | if ((mac = read_body(fp)) == NULL) |
669 | goto error; |
670 | is_mac = 1; |
7bedb13c |
671 | } else if (0 == strcmp(header, "Private-Hash") && |
672 | alg == &ssh_rsa && old_fmt) { |
5c72ca61 |
673 | if ((mac = read_body(fp)) == NULL) |
674 | goto error; |
675 | is_mac = 0; |
676 | } else |
65a22376 |
677 | goto error; |
678 | |
679 | fclose(fp); |
680 | fp = NULL; |
681 | |
682 | /* |
683 | * Decrypt the private blob. |
684 | */ |
685 | if (cipher) { |
686 | unsigned char key[40]; |
687 | SHA_State s; |
65a22376 |
688 | |
689 | if (!passphrase) |
690 | goto error; |
691 | if (private_blob_len % cipherblk) |
692 | goto error; |
693 | |
65a22376 |
694 | SHA_Init(&s); |
695 | SHA_Bytes(&s, "\0\0\0\0", 4); |
696 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
697 | SHA_Final(&s, key + 0); |
65a22376 |
698 | SHA_Init(&s); |
699 | SHA_Bytes(&s, "\0\0\0\1", 4); |
700 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
701 | SHA_Final(&s, key + 20); |
65a22376 |
702 | aes256_decrypt_pubkey(key, private_blob, private_blob_len); |
703 | } |
704 | |
705 | /* |
7bedb13c |
706 | * Verify the MAC. |
65a22376 |
707 | */ |
708 | { |
5c72ca61 |
709 | char realmac[41]; |
65a22376 |
710 | unsigned char binary[20]; |
7bedb13c |
711 | unsigned char *macdata; |
712 | int maclen; |
713 | int free_macdata; |
714 | |
715 | if (old_fmt) { |
716 | /* MAC (or hash) only covers the private blob. */ |
717 | macdata = private_blob; |
718 | maclen = private_blob_len; |
719 | free_macdata = 0; |
720 | } else { |
721 | unsigned char *p; |
722 | int namelen = strlen(alg->name); |
723 | int enclen = strlen(encryption); |
724 | int commlen = strlen(comment); |
725 | maclen = (4 + namelen + |
726 | 4 + enclen + |
727 | 4 + commlen + |
728 | 4 + public_blob_len + |
729 | 4 + private_blob_len); |
3d88e64d |
730 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
731 | p = macdata; |
732 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
733 | DO_STR(alg->name, namelen); |
734 | DO_STR(encryption, enclen); |
735 | DO_STR(comment, commlen); |
736 | DO_STR(public_blob, public_blob_len); |
737 | DO_STR(private_blob, private_blob_len); |
738 | |
739 | free_macdata = 1; |
740 | } |
65a22376 |
741 | |
5c72ca61 |
742 | if (is_mac) { |
743 | SHA_State s; |
744 | unsigned char mackey[20]; |
745 | char header[] = "putty-private-key-file-mac-key"; |
746 | |
5c72ca61 |
747 | SHA_Init(&s); |
748 | SHA_Bytes(&s, header, sizeof(header)-1); |
7bedb13c |
749 | if (passphrase) |
750 | SHA_Bytes(&s, passphrase, passlen); |
5c72ca61 |
751 | SHA_Final(&s, mackey); |
752 | |
7bedb13c |
753 | hmac_sha1_simple(mackey, 20, macdata, maclen, binary); |
5c72ca61 |
754 | |
755 | memset(mackey, 0, sizeof(mackey)); |
756 | memset(&s, 0, sizeof(s)); |
757 | } else { |
7bedb13c |
758 | SHA_Simple(macdata, maclen, binary); |
5c72ca61 |
759 | } |
7bedb13c |
760 | |
761 | if (free_macdata) { |
762 | memset(macdata, 0, maclen); |
763 | sfree(macdata); |
764 | } |
765 | |
65a22376 |
766 | for (i = 0; i < 20; i++) |
5c72ca61 |
767 | sprintf(realmac + 2 * i, "%02x", binary[i]); |
65a22376 |
768 | |
5c72ca61 |
769 | if (strcmp(mac, realmac)) { |
770 | /* An incorrect MAC is an unconditional Error if the key is |
65a22376 |
771 | * unencrypted. Otherwise, it means Wrong Passphrase. */ |
772 | ret = cipher ? SSH2_WRONG_PASSPHRASE : NULL; |
773 | goto error; |
774 | } |
775 | } |
5c72ca61 |
776 | sfree(mac); |
65a22376 |
777 | |
778 | /* |
779 | * Create and return the key. |
780 | */ |
3d88e64d |
781 | ret = snew(struct ssh2_userkey); |
65a22376 |
782 | ret->alg = alg; |
783 | ret->comment = comment; |
784 | ret->data = alg->createkey(public_blob, public_blob_len, |
785 | private_blob, private_blob_len); |
98f022f5 |
786 | if (!ret->data) { |
787 | sfree(ret->comment); |
788 | sfree(ret); |
789 | ret = NULL; |
790 | } |
65a22376 |
791 | sfree(public_blob); |
792 | sfree(private_blob); |
7bedb13c |
793 | sfree(encryption); |
65a22376 |
794 | return ret; |
795 | |
796 | /* |
797 | * Error processing. |
798 | */ |
32874aea |
799 | error: |
800 | if (fp) |
801 | fclose(fp); |
802 | if (comment) |
803 | sfree(comment); |
7bedb13c |
804 | if (encryption) |
805 | sfree(encryption); |
5c72ca61 |
806 | if (mac) |
807 | sfree(mac); |
32874aea |
808 | if (public_blob) |
809 | sfree(public_blob); |
810 | if (private_blob) |
811 | sfree(private_blob); |
65a22376 |
812 | return ret; |
813 | } |
814 | |
9a30e26b |
815 | char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm, |
32874aea |
816 | int *pub_blob_len) |
817 | { |
65a22376 |
818 | FILE *fp; |
819 | char header[40], *b; |
820 | const struct ssh_signkey *alg; |
65a22376 |
821 | unsigned char *public_blob; |
822 | int public_blob_len; |
823 | int i; |
824 | |
825 | public_blob = NULL; |
826 | |
9a30e26b |
827 | fp = f_open(*filename, "rb"); |
65a22376 |
828 | if (!fp) |
829 | goto error; |
830 | |
831 | /* Read the first header line which contains the key type. */ |
32874aea |
832 | if (!read_header(fp, header) |
7bedb13c |
833 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
834 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) |
65a22376 |
835 | goto error; |
836 | if ((b = read_body(fp)) == NULL) |
837 | goto error; |
838 | /* Select key algorithm structure. Currently only ssh-rsa. */ |
839 | if (!strcmp(b, "ssh-rsa")) |
840 | alg = &ssh_rsa; |
5c72ca61 |
841 | else if (!strcmp(b, "ssh-dss")) |
842 | alg = &ssh_dss; |
65a22376 |
843 | else { |
844 | sfree(b); |
845 | goto error; |
846 | } |
847 | sfree(b); |
32874aea |
848 | |
65a22376 |
849 | /* Read the Encryption header line. */ |
32874aea |
850 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
65a22376 |
851 | goto error; |
852 | if ((b = read_body(fp)) == NULL) |
853 | goto error; |
854 | sfree(b); /* we don't care */ |
855 | |
856 | /* Read the Comment header line. */ |
32874aea |
857 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
858 | goto error; |
859 | if ((b = read_body(fp)) == NULL) |
860 | goto error; |
861 | sfree(b); /* we don't care */ |
862 | |
863 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
864 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
865 | goto error; |
866 | if ((b = read_body(fp)) == NULL) |
867 | goto error; |
868 | i = atoi(b); |
869 | sfree(b); |
870 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
871 | goto error; |
872 | |
873 | fclose(fp); |
3f2d010c |
874 | if (pub_blob_len) |
875 | *pub_blob_len = public_blob_len; |
876 | if (algorithm) |
877 | *algorithm = alg->name; |
2247e107 |
878 | return (char *)public_blob; |
65a22376 |
879 | |
880 | /* |
881 | * Error processing. |
882 | */ |
32874aea |
883 | error: |
884 | if (fp) |
885 | fclose(fp); |
886 | if (public_blob) |
887 | sfree(public_blob); |
65a22376 |
888 | return NULL; |
889 | } |
890 | |
9a30e26b |
891 | int ssh2_userkey_encrypted(const Filename *filename, char **commentptr) |
32874aea |
892 | { |
65a22376 |
893 | FILE *fp; |
894 | char header[40], *b, *comment; |
895 | int ret; |
896 | |
32874aea |
897 | if (commentptr) |
898 | *commentptr = NULL; |
65a22376 |
899 | |
9a30e26b |
900 | fp = f_open(*filename, "rb"); |
65a22376 |
901 | if (!fp) |
902 | return 0; |
32874aea |
903 | if (!read_header(fp, header) |
7bedb13c |
904 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
905 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) { |
32874aea |
906 | fclose(fp); |
907 | return 0; |
65a22376 |
908 | } |
909 | if ((b = read_body(fp)) == NULL) { |
32874aea |
910 | fclose(fp); |
911 | return 0; |
65a22376 |
912 | } |
913 | sfree(b); /* we don't care about key type here */ |
914 | /* Read the Encryption header line. */ |
32874aea |
915 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) { |
916 | fclose(fp); |
917 | return 0; |
65a22376 |
918 | } |
919 | if ((b = read_body(fp)) == NULL) { |
32874aea |
920 | fclose(fp); |
921 | return 0; |
65a22376 |
922 | } |
923 | |
924 | /* Read the Comment header line. */ |
32874aea |
925 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) { |
926 | fclose(fp); |
927 | sfree(b); |
928 | return 1; |
65a22376 |
929 | } |
930 | if ((comment = read_body(fp)) == NULL) { |
32874aea |
931 | fclose(fp); |
932 | sfree(b); |
933 | return 1; |
65a22376 |
934 | } |
935 | |
32874aea |
936 | if (commentptr) |
937 | *commentptr = comment; |
65a22376 |
938 | |
939 | fclose(fp); |
940 | if (!strcmp(b, "aes256-cbc")) |
941 | ret = 1; |
942 | else |
943 | ret = 0; |
944 | sfree(b); |
945 | return ret; |
946 | } |
947 | |
32874aea |
948 | int base64_lines(int datalen) |
949 | { |
65a22376 |
950 | /* When encoding, we use 64 chars/line, which equals 48 real chars. */ |
32874aea |
951 | return (datalen + 47) / 48; |
65a22376 |
952 | } |
953 | |
96d19bc9 |
954 | void base64_encode(FILE * fp, unsigned char *data, int datalen, int cpl) |
32874aea |
955 | { |
65a22376 |
956 | int linelen = 0; |
957 | char out[4]; |
96d19bc9 |
958 | int n, i; |
65a22376 |
959 | |
960 | while (datalen > 0) { |
65a22376 |
961 | n = (datalen < 3 ? datalen : 3); |
962 | base64_encode_atom(data, n, out); |
963 | data += n; |
964 | datalen -= n; |
96d19bc9 |
965 | for (i = 0; i < 4; i++) { |
966 | if (linelen >= cpl) { |
967 | linelen = 0; |
968 | fputc('\n', fp); |
969 | } |
970 | fputc(out[i], fp); |
971 | linelen++; |
972 | } |
65a22376 |
973 | } |
974 | fputc('\n', fp); |
975 | } |
976 | |
9a30e26b |
977 | int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key, |
32874aea |
978 | char *passphrase) |
979 | { |
65a22376 |
980 | FILE *fp; |
981 | unsigned char *pub_blob, *priv_blob, *priv_blob_encrypted; |
982 | int pub_blob_len, priv_blob_len, priv_encrypted_len; |
983 | int passlen; |
984 | int cipherblk; |
7bedb13c |
985 | int i; |
65a22376 |
986 | char *cipherstr; |
5c72ca61 |
987 | unsigned char priv_mac[20]; |
65a22376 |
988 | |
989 | /* |
990 | * Fetch the key component blobs. |
991 | */ |
992 | pub_blob = key->alg->public_blob(key->data, &pub_blob_len); |
993 | priv_blob = key->alg->private_blob(key->data, &priv_blob_len); |
994 | if (!pub_blob || !priv_blob) { |
995 | sfree(pub_blob); |
996 | sfree(priv_blob); |
997 | return 0; |
998 | } |
999 | |
1000 | /* |
1001 | * Determine encryption details, and encrypt the private blob. |
1002 | */ |
1003 | if (passphrase) { |
1004 | cipherstr = "aes256-cbc"; |
1005 | cipherblk = 16; |
1006 | } else { |
1007 | cipherstr = "none"; |
1008 | cipherblk = 1; |
1009 | } |
1010 | priv_encrypted_len = priv_blob_len + cipherblk - 1; |
1011 | priv_encrypted_len -= priv_encrypted_len % cipherblk; |
3d88e64d |
1012 | priv_blob_encrypted = snewn(priv_encrypted_len, unsigned char); |
65a22376 |
1013 | memset(priv_blob_encrypted, 0, priv_encrypted_len); |
1014 | memcpy(priv_blob_encrypted, priv_blob, priv_blob_len); |
1015 | /* Create padding based on the SHA hash of the unpadded blob. This prevents |
1016 | * too easy a known-plaintext attack on the last block. */ |
5c72ca61 |
1017 | SHA_Simple(priv_blob, priv_blob_len, priv_mac); |
65a22376 |
1018 | assert(priv_encrypted_len - priv_blob_len < 20); |
5c72ca61 |
1019 | memcpy(priv_blob_encrypted + priv_blob_len, priv_mac, |
65a22376 |
1020 | priv_encrypted_len - priv_blob_len); |
1021 | |
7bedb13c |
1022 | /* Now create the MAC. */ |
1023 | { |
1024 | unsigned char *macdata; |
1025 | int maclen; |
1026 | unsigned char *p; |
1027 | int namelen = strlen(key->alg->name); |
1028 | int enclen = strlen(cipherstr); |
1029 | int commlen = strlen(key->comment); |
5c72ca61 |
1030 | SHA_State s; |
1031 | unsigned char mackey[20]; |
1032 | char header[] = "putty-private-key-file-mac-key"; |
1033 | |
7bedb13c |
1034 | maclen = (4 + namelen + |
1035 | 4 + enclen + |
1036 | 4 + commlen + |
1037 | 4 + pub_blob_len + |
1038 | 4 + priv_encrypted_len); |
3d88e64d |
1039 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
1040 | p = macdata; |
1041 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
1042 | DO_STR(key->alg->name, namelen); |
1043 | DO_STR(cipherstr, enclen); |
1044 | DO_STR(key->comment, commlen); |
1045 | DO_STR(pub_blob, pub_blob_len); |
1046 | DO_STR(priv_blob_encrypted, priv_encrypted_len); |
5c72ca61 |
1047 | |
1048 | SHA_Init(&s); |
1049 | SHA_Bytes(&s, header, sizeof(header)-1); |
7bedb13c |
1050 | if (passphrase) |
1051 | SHA_Bytes(&s, passphrase, strlen(passphrase)); |
5c72ca61 |
1052 | SHA_Final(&s, mackey); |
7bedb13c |
1053 | hmac_sha1_simple(mackey, 20, macdata, maclen, priv_mac); |
1054 | memset(macdata, 0, maclen); |
1055 | sfree(macdata); |
5c72ca61 |
1056 | memset(mackey, 0, sizeof(mackey)); |
1057 | memset(&s, 0, sizeof(s)); |
5c72ca61 |
1058 | } |
65a22376 |
1059 | |
1060 | if (passphrase) { |
2247e107 |
1061 | unsigned char key[40]; |
65a22376 |
1062 | SHA_State s; |
1063 | |
1064 | passlen = strlen(passphrase); |
1065 | |
1066 | SHA_Init(&s); |
1067 | SHA_Bytes(&s, "\0\0\0\0", 4); |
1068 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1069 | SHA_Final(&s, key + 0); |
65a22376 |
1070 | SHA_Init(&s); |
1071 | SHA_Bytes(&s, "\0\0\0\1", 4); |
1072 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1073 | SHA_Final(&s, key + 20); |
1074 | aes256_encrypt_pubkey(key, priv_blob_encrypted, |
1075 | priv_encrypted_len); |
5c72ca61 |
1076 | |
1077 | memset(key, 0, sizeof(key)); |
1078 | memset(&s, 0, sizeof(s)); |
65a22376 |
1079 | } |
1080 | |
9a30e26b |
1081 | fp = f_open(*filename, "w"); |
65a22376 |
1082 | if (!fp) |
1083 | return 0; |
7bedb13c |
1084 | fprintf(fp, "PuTTY-User-Key-File-2: %s\n", key->alg->name); |
65a22376 |
1085 | fprintf(fp, "Encryption: %s\n", cipherstr); |
1086 | fprintf(fp, "Comment: %s\n", key->comment); |
1087 | fprintf(fp, "Public-Lines: %d\n", base64_lines(pub_blob_len)); |
96d19bc9 |
1088 | base64_encode(fp, pub_blob, pub_blob_len, 64); |
65a22376 |
1089 | fprintf(fp, "Private-Lines: %d\n", base64_lines(priv_encrypted_len)); |
96d19bc9 |
1090 | base64_encode(fp, priv_blob_encrypted, priv_encrypted_len, 64); |
7bedb13c |
1091 | fprintf(fp, "Private-MAC: "); |
65a22376 |
1092 | for (i = 0; i < 20; i++) |
5c72ca61 |
1093 | fprintf(fp, "%02x", priv_mac[i]); |
65a22376 |
1094 | fprintf(fp, "\n"); |
1095 | fclose(fp); |
7bedb13c |
1096 | |
1097 | sfree(pub_blob); |
1098 | memset(priv_blob, 0, priv_blob_len); |
1099 | sfree(priv_blob); |
1100 | sfree(priv_blob_encrypted); |
65a22376 |
1101 | return 1; |
1102 | } |
1103 | |
1104 | /* ---------------------------------------------------------------------- |
231ee168 |
1105 | * A function to determine the type of a private key file. Returns |
1106 | * 0 on failure, 1 or 2 on success. |
65a22376 |
1107 | */ |
9a30e26b |
1108 | int key_type(const Filename *filename) |
32874aea |
1109 | { |
65a22376 |
1110 | FILE *fp; |
231ee168 |
1111 | char buf[32]; |
1112 | const char putty2_sig[] = "PuTTY-User-Key-File-"; |
1113 | const char sshcom_sig[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT"; |
1114 | const char openssh_sig[] = "-----BEGIN "; |
65a22376 |
1115 | int i; |
1116 | |
9a30e26b |
1117 | fp = f_open(*filename, "r"); |
65a22376 |
1118 | if (!fp) |
231ee168 |
1119 | return SSH_KEYTYPE_UNOPENABLE; |
1120 | i = fread(buf, 1, sizeof(buf), fp); |
65a22376 |
1121 | fclose(fp); |
231ee168 |
1122 | if (i < 0) |
1123 | return SSH_KEYTYPE_UNOPENABLE; |
1124 | if (i < 32) |
1125 | return SSH_KEYTYPE_UNKNOWN; |
1126 | if (!memcmp(buf, rsa_signature, sizeof(rsa_signature)-1)) |
1127 | return SSH_KEYTYPE_SSH1; |
1128 | if (!memcmp(buf, putty2_sig, sizeof(putty2_sig)-1)) |
1129 | return SSH_KEYTYPE_SSH2; |
1130 | if (!memcmp(buf, openssh_sig, sizeof(openssh_sig)-1)) |
1131 | return SSH_KEYTYPE_OPENSSH; |
1132 | if (!memcmp(buf, sshcom_sig, sizeof(sshcom_sig)-1)) |
1133 | return SSH_KEYTYPE_SSHCOM; |
1134 | return SSH_KEYTYPE_UNKNOWN; /* unrecognised or EOF */ |
1135 | } |
1136 | |
1137 | /* |
1138 | * Convert the type word to a string, for `wrong type' error |
1139 | * messages. |
1140 | */ |
1141 | char *key_type_to_str(int type) |
1142 | { |
1143 | switch (type) { |
1144 | case SSH_KEYTYPE_UNOPENABLE: return "unable to open file"; break; |
1145 | case SSH_KEYTYPE_UNKNOWN: return "not a private key"; break; |
1146 | case SSH_KEYTYPE_SSH1: return "SSH1 private key"; break; |
1147 | case SSH_KEYTYPE_SSH2: return "PuTTY SSH2 private key"; break; |
1148 | case SSH_KEYTYPE_OPENSSH: return "OpenSSH SSH2 private key"; break; |
1149 | case SSH_KEYTYPE_SSHCOM: return "ssh.com SSH2 private key"; break; |
1150 | default: return "INTERNAL ERROR"; break; |
1151 | } |
65a22376 |
1152 | } |