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, |
222d54dc |
37 | char **commentptr, char *passphrase, |
38 | const char **error) |
32874aea |
39 | { |
3eca8453 |
40 | unsigned char buf[16384]; |
41 | unsigned char keybuf[16]; |
42 | int len; |
43 | int i, j, ciphertype; |
44 | int ret = 0; |
45 | struct MD5Context md5c; |
a52f067e |
46 | char *comment; |
3eca8453 |
47 | |
222d54dc |
48 | *error = NULL; |
49 | |
a52f067e |
50 | /* Slurp the whole file (minus the header) into a buffer. */ |
3eca8453 |
51 | len = fread(buf, 1, sizeof(buf), fp); |
52 | fclose(fp); |
222d54dc |
53 | if (len < 0 || len == sizeof(buf)) { |
54 | *error = "error reading file"; |
32874aea |
55 | goto end; /* file too big or not read */ |
222d54dc |
56 | } |
3eca8453 |
57 | |
a52f067e |
58 | i = 0; |
222d54dc |
59 | *error = "file format error"; |
3eca8453 |
60 | |
a52f067e |
61 | /* |
62 | * A zero byte. (The signature includes a terminating NUL.) |
63 | */ |
32874aea |
64 | if (len - i < 1 || buf[i] != 0) |
65 | goto end; |
a52f067e |
66 | i++; |
3eca8453 |
67 | |
a52f067e |
68 | /* One byte giving encryption type, and one reserved uint32. */ |
32874aea |
69 | if (len - i < 1) |
70 | goto end; |
3eca8453 |
71 | ciphertype = buf[i]; |
72 | if (ciphertype != 0 && ciphertype != SSH_CIPHER_3DES) |
32874aea |
73 | goto end; |
3eca8453 |
74 | i++; |
32874aea |
75 | if (len - i < 4) |
76 | goto end; /* reserved field not present */ |
77 | if (buf[i] != 0 || buf[i + 1] != 0 || buf[i + 2] != 0 |
78 | || buf[i + 3] != 0) goto end; /* reserved field nonzero, panic! */ |
3eca8453 |
79 | i += 4; |
80 | |
81 | /* Now the serious stuff. An ordinary SSH 1 public key. */ |
0016d70b |
82 | i += makekey(buf + i, len, key, NULL, 1); |
83 | if (i < 0) |
32874aea |
84 | goto end; /* overran */ |
3eca8453 |
85 | |
3f2d010c |
86 | if (pub_only) { |
87 | ret = 1; |
88 | goto end; |
89 | } |
90 | |
3eca8453 |
91 | /* Next, the comment field. */ |
32874aea |
92 | j = GET_32BIT(buf + i); |
5c58ad2d |
93 | i += 4; |
32874aea |
94 | if (len - i < j) |
95 | goto end; |
3d88e64d |
96 | comment = snewn(j + 1, char); |
a52f067e |
97 | if (comment) { |
32874aea |
98 | memcpy(comment, buf + i, j); |
99 | comment[j] = '\0'; |
5c58ad2d |
100 | } |
101 | i += j; |
a52f067e |
102 | if (commentptr) |
32874aea |
103 | *commentptr = comment; |
a52f067e |
104 | if (key) |
32874aea |
105 | key->comment = comment; |
a52f067e |
106 | if (!key) { |
222d54dc |
107 | ret = ciphertype != 0; |
108 | *error = NULL; |
109 | goto end; |
a52f067e |
110 | } |
3eca8453 |
111 | |
112 | /* |
113 | * Decrypt remainder of buffer. |
114 | */ |
115 | if (ciphertype) { |
32874aea |
116 | MD5Init(&md5c); |
2247e107 |
117 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
118 | MD5Final(keybuf, &md5c); |
119 | des3_decrypt_pubkey(keybuf, buf + i, (len - i + 7) & ~7); |
120 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
3eca8453 |
121 | } |
122 | |
123 | /* |
124 | * We are now in the secret part of the key. The first four |
125 | * bytes should be of the form a, b, a, b. |
126 | */ |
32874aea |
127 | if (len - i < 4) |
128 | goto end; |
129 | if (buf[i] != buf[i + 2] || buf[i + 1] != buf[i + 3]) { |
222d54dc |
130 | *error = "wrong passphrase"; |
32874aea |
131 | ret = -1; |
132 | goto end; |
133 | } |
3eca8453 |
134 | i += 4; |
135 | |
136 | /* |
137 | * After that, we have one further bignum which is our |
6e522441 |
138 | * decryption exponent, and then the three auxiliary values |
139 | * (iqmp, q, p). |
3eca8453 |
140 | */ |
0016d70b |
141 | j = makeprivate(buf + i, len - i, key); |
142 | if (j < 0) goto end; |
143 | i += j; |
144 | j = ssh1_read_bignum(buf + i, len - i, &key->iqmp); |
145 | if (j < 0) goto end; |
146 | i += j; |
147 | j = ssh1_read_bignum(buf + i, len - i, &key->q); |
148 | if (j < 0) goto end; |
149 | i += j; |
150 | j = ssh1_read_bignum(buf + i, len - i, &key->p); |
151 | if (j < 0) goto end; |
152 | i += j; |
3eca8453 |
153 | |
98f022f5 |
154 | if (!rsa_verify(key)) { |
222d54dc |
155 | *error = "rsa_verify failed"; |
98f022f5 |
156 | freersakey(key); |
157 | ret = 0; |
158 | } else |
159 | ret = 1; |
160 | |
32874aea |
161 | end: |
3eca8453 |
162 | memset(buf, 0, sizeof(buf)); /* burn the evidence */ |
163 | return ret; |
164 | } |
165 | |
222d54dc |
166 | int loadrsakey(const Filename *filename, struct RSAKey *key, char *passphrase, |
167 | const char **errorstr) |
32874aea |
168 | { |
3eca8453 |
169 | FILE *fp; |
2247e107 |
170 | char buf[64]; |
222d54dc |
171 | int ret = 0; |
172 | const char *error = NULL; |
3eca8453 |
173 | |
9a30e26b |
174 | fp = f_open(*filename, "rb"); |
222d54dc |
175 | if (!fp) { |
176 | error = "can't open file"; |
177 | goto end; |
178 | } |
3eca8453 |
179 | |
a52f067e |
180 | /* |
181 | * Read the first line of the file and see if it's a v1 private |
182 | * key file. |
183 | */ |
32874aea |
184 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
e19fadd7 |
185 | /* |
186 | * This routine will take care of calling fclose() for us. |
187 | */ |
222d54dc |
188 | ret = loadrsakey_main(fp, key, FALSE, NULL, passphrase, &error); |
47a6b94c |
189 | fp = NULL; |
222d54dc |
190 | goto end; |
a52f067e |
191 | } |
192 | |
193 | /* |
194 | * Otherwise, we have nothing. Return empty-handed. |
195 | */ |
222d54dc |
196 | error = "not an SSH-1 RSA file"; |
197 | |
198 | end: |
47a6b94c |
199 | if (fp) |
200 | fclose(fp); |
222d54dc |
201 | if ((ret != 1) && errorstr) |
202 | *errorstr = error; |
203 | return ret; |
3eca8453 |
204 | } |
a52f067e |
205 | |
206 | /* |
207 | * See whether an RSA key is encrypted. Return its comment field as |
208 | * well. |
209 | */ |
9a30e26b |
210 | int rsakey_encrypted(const Filename *filename, char **comment) |
32874aea |
211 | { |
a52f067e |
212 | FILE *fp; |
2247e107 |
213 | char buf[64]; |
a52f067e |
214 | |
9a30e26b |
215 | fp = f_open(*filename, "rb"); |
a52f067e |
216 | if (!fp) |
32874aea |
217 | return 0; /* doesn't even exist */ |
a52f067e |
218 | |
219 | /* |
220 | * Read the first line of the file and see if it's a v1 private |
221 | * key file. |
222 | */ |
32874aea |
223 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
222d54dc |
224 | const char *dummy; |
e19fadd7 |
225 | /* |
226 | * This routine will take care of calling fclose() for us. |
227 | */ |
222d54dc |
228 | return loadrsakey_main(fp, NULL, FALSE, comment, NULL, &dummy); |
a52f067e |
229 | } |
404f728b |
230 | fclose(fp); |
32874aea |
231 | return 0; /* wasn't the right kind of file */ |
a52f067e |
232 | } |
6e522441 |
233 | |
234 | /* |
3f2d010c |
235 | * Return a malloc'ed chunk of memory containing the public blob of |
236 | * an RSA key, as given in the agent protocol (modulus bits, |
237 | * exponent, modulus). |
238 | */ |
222d54dc |
239 | int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen, |
240 | const char **errorstr) |
3f2d010c |
241 | { |
242 | FILE *fp; |
2247e107 |
243 | char buf[64]; |
3f2d010c |
244 | struct RSAKey key; |
245 | int ret; |
222d54dc |
246 | const char *error = NULL; |
3f2d010c |
247 | |
248 | /* Default return if we fail. */ |
249 | *blob = NULL; |
250 | *bloblen = 0; |
251 | ret = 0; |
252 | |
9a30e26b |
253 | fp = f_open(*filename, "rb"); |
222d54dc |
254 | if (!fp) { |
255 | error = "can't open file"; |
256 | goto end; |
257 | } |
3f2d010c |
258 | |
259 | /* |
260 | * Read the first line of the file and see if it's a v1 private |
261 | * key file. |
262 | */ |
263 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
264 | memset(&key, 0, sizeof(key)); |
222d54dc |
265 | if (loadrsakey_main(fp, &key, TRUE, NULL, NULL, &error)) { |
3f2d010c |
266 | *blob = rsa_public_blob(&key, bloblen); |
267 | freersakey(&key); |
268 | ret = 1; |
47a6b94c |
269 | fp = NULL; |
3f2d010c |
270 | } |
222d54dc |
271 | } else { |
272 | error = "not an SSH-1 RSA file"; |
3f2d010c |
273 | } |
222d54dc |
274 | |
275 | end: |
e19fadd7 |
276 | if (fp) |
277 | fclose(fp); |
222d54dc |
278 | if ((ret != 1) && errorstr) |
279 | *errorstr = error; |
3f2d010c |
280 | return ret; |
281 | } |
282 | |
283 | /* |
6e522441 |
284 | * Save an RSA key file. Return nonzero on success. |
285 | */ |
9a30e26b |
286 | int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase) |
32874aea |
287 | { |
6e522441 |
288 | unsigned char buf[16384]; |
289 | unsigned char keybuf[16]; |
290 | struct MD5Context md5c; |
49bad831 |
291 | unsigned char *p, *estart; |
6e522441 |
292 | FILE *fp; |
293 | |
294 | /* |
295 | * Write the initial signature. |
296 | */ |
297 | p = buf; |
298 | memcpy(p, rsa_signature, sizeof(rsa_signature)); |
299 | p += sizeof(rsa_signature); |
300 | |
301 | /* |
302 | * One byte giving encryption type, and one reserved (zero) |
303 | * uint32. |
304 | */ |
305 | *p++ = (passphrase ? SSH_CIPHER_3DES : 0); |
32874aea |
306 | PUT_32BIT(p, 0); |
307 | p += 4; |
6e522441 |
308 | |
309 | /* |
310 | * An ordinary SSH 1 public key consists of: a uint32 |
311 | * containing the bit count, then two bignums containing the |
312 | * modulus and exponent respectively. |
313 | */ |
32874aea |
314 | PUT_32BIT(p, bignum_bitcount(key->modulus)); |
315 | p += 4; |
6e522441 |
316 | p += ssh1_write_bignum(p, key->modulus); |
317 | p += ssh1_write_bignum(p, key->exponent); |
318 | |
319 | /* |
320 | * A string containing the comment field. |
321 | */ |
322 | if (key->comment) { |
32874aea |
323 | PUT_32BIT(p, strlen(key->comment)); |
324 | p += 4; |
325 | memcpy(p, key->comment, strlen(key->comment)); |
326 | p += strlen(key->comment); |
6e522441 |
327 | } else { |
32874aea |
328 | PUT_32BIT(p, 0); |
329 | p += 4; |
6e522441 |
330 | } |
331 | |
332 | /* |
333 | * The encrypted portion starts here. |
334 | */ |
335 | estart = p; |
336 | |
337 | /* |
338 | * Two bytes, then the same two bytes repeated. |
339 | */ |
340 | *p++ = random_byte(); |
341 | *p++ = random_byte(); |
32874aea |
342 | p[0] = p[-2]; |
343 | p[1] = p[-1]; |
344 | p += 2; |
6e522441 |
345 | |
346 | /* |
347 | * Four more bignums: the decryption exponent, then iqmp, then |
348 | * q, then p. |
349 | */ |
350 | p += ssh1_write_bignum(p, key->private_exponent); |
65a22376 |
351 | p += ssh1_write_bignum(p, key->iqmp); |
352 | p += ssh1_write_bignum(p, key->q); |
353 | p += ssh1_write_bignum(p, key->p); |
6e522441 |
354 | |
355 | /* |
356 | * Now write zeros until the encrypted portion is a multiple of |
357 | * 8 bytes. |
358 | */ |
32874aea |
359 | while ((p - estart) % 8) |
360 | *p++ = '\0'; |
6e522441 |
361 | |
362 | /* |
363 | * Now encrypt the encrypted portion. |
364 | */ |
365 | if (passphrase) { |
32874aea |
366 | MD5Init(&md5c); |
2247e107 |
367 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
368 | MD5Final(keybuf, &md5c); |
369 | des3_encrypt_pubkey(keybuf, estart, p - estart); |
370 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
6e522441 |
371 | } |
372 | |
373 | /* |
374 | * Done. Write the result to the file. |
375 | */ |
9a30e26b |
376 | fp = f_open(*filename, "wb"); |
6e522441 |
377 | if (fp) { |
32874aea |
378 | int ret = (fwrite(buf, 1, p - buf, fp) == (size_t) (p - buf)); |
6402ecf9 |
379 | if (fclose(fp)) |
380 | ret = 0; |
32874aea |
381 | return ret; |
6e522441 |
382 | } else |
32874aea |
383 | return 0; |
6e522441 |
384 | } |
65a22376 |
385 | |
386 | /* ---------------------------------------------------------------------- |
387 | * SSH2 private key load/store functions. |
388 | */ |
389 | |
390 | /* |
391 | * PuTTY's own format for SSH2 keys is as follows: |
5c72ca61 |
392 | * |
65a22376 |
393 | * The file is text. Lines are terminated by CRLF, although CR-only |
394 | * and LF-only are tolerated on input. |
5c72ca61 |
395 | * |
7bedb13c |
396 | * The first line says "PuTTY-User-Key-File-2: " plus the name of the |
5c72ca61 |
397 | * algorithm ("ssh-dss", "ssh-rsa" etc). |
398 | * |
65a22376 |
399 | * The next line says "Encryption: " plus an encryption type. |
400 | * Currently the only supported encryption types are "aes256-cbc" |
401 | * and "none". |
5c72ca61 |
402 | * |
65a22376 |
403 | * The next line says "Comment: " plus the comment string. |
5c72ca61 |
404 | * |
65a22376 |
405 | * Next there is a line saying "Public-Lines: " plus a number N. |
406 | * The following N lines contain a base64 encoding of the public |
407 | * part of the key. This is encoded as the standard SSH2 public key |
408 | * blob (with no initial length): so for RSA, for example, it will |
409 | * read |
5c72ca61 |
410 | * |
65a22376 |
411 | * string "ssh-rsa" |
412 | * mpint exponent |
413 | * mpint modulus |
5c72ca61 |
414 | * |
65a22376 |
415 | * Next, there is a line saying "Private-Lines: " plus a number N, |
416 | * and then N lines containing the (potentially encrypted) private |
417 | * part of the key. For the key type "ssh-rsa", this will be |
418 | * composed of |
5c72ca61 |
419 | * |
65a22376 |
420 | * mpint private_exponent |
421 | * mpint p (the larger of the two primes) |
422 | * mpint q (the smaller prime) |
423 | * mpint iqmp (the inverse of q modulo p) |
424 | * data padding (to reach a multiple of the cipher block size) |
5c72ca61 |
425 | * |
426 | * And for "ssh-dss", it will be composed of |
427 | * |
428 | * mpint x (the private key parameter) |
7bedb13c |
429 | * [ string hash 20-byte hash of mpints p || q || g only in old format ] |
5c72ca61 |
430 | * |
7bedb13c |
431 | * Finally, there is a line saying "Private-MAC: " plus a hex |
432 | * representation of a HMAC-SHA-1 of: |
433 | * |
434 | * string name of algorithm ("ssh-dss", "ssh-rsa") |
435 | * string encryption type |
436 | * string comment |
437 | * string public-blob |
438 | * string private-plaintext (the plaintext version of the |
439 | * private part, including the final |
440 | * padding) |
65a22376 |
441 | * |
5c72ca61 |
442 | * The key to the MAC is itself a SHA-1 hash of: |
65a22376 |
443 | * |
5c72ca61 |
444 | * data "putty-private-key-file-mac-key" |
445 | * data passphrase |
446 | * |
28ad39e0 |
447 | * (An empty passphrase is used for unencrypted keys.) |
5c72ca61 |
448 | * |
65a22376 |
449 | * If the key is encrypted, the encryption key is derived from the |
450 | * passphrase by means of a succession of SHA-1 hashes. Each hash |
451 | * is the hash of: |
5c72ca61 |
452 | * |
65a22376 |
453 | * uint32 sequence-number |
5c72ca61 |
454 | * data passphrase |
455 | * |
65a22376 |
456 | * where the sequence-number increases from zero. As many of these |
457 | * hashes are used as necessary. |
5c72ca61 |
458 | * |
7bedb13c |
459 | * For backwards compatibility with snapshots between 0.51 and |
460 | * 0.52, we also support the older key file format, which begins |
461 | * with "PuTTY-User-Key-File-1" (version number differs). In this |
462 | * format the Private-MAC: field only covers the private-plaintext |
463 | * field and nothing else (and without the 4-byte string length on |
464 | * the front too). Moreover, for RSA keys the Private-MAC: field |
465 | * can be replaced with a Private-Hash: field which is a plain |
466 | * SHA-1 hash instead of an HMAC. This is not allowable in DSA |
467 | * keys. (Yes, the old format was a mess. Guess why it changed :-) |
65a22376 |
468 | */ |
469 | |
32874aea |
470 | static int read_header(FILE * fp, char *header) |
471 | { |
65a22376 |
472 | int len = 39; |
473 | int c; |
474 | |
475 | while (len > 0) { |
476 | c = fgetc(fp); |
477 | if (c == '\n' || c == '\r' || c == EOF) |
478 | return 0; /* failure */ |
479 | if (c == ':') { |
480 | c = fgetc(fp); |
481 | if (c != ' ') |
482 | return 0; |
483 | *header = '\0'; |
484 | return 1; /* success! */ |
485 | } |
486 | if (len == 0) |
487 | return 0; /* failure */ |
488 | *header++ = c; |
489 | len--; |
490 | } |
491 | return 0; /* failure */ |
492 | } |
493 | |
32874aea |
494 | static char *read_body(FILE * fp) |
495 | { |
65a22376 |
496 | char *text; |
497 | int len; |
498 | int size; |
499 | int c; |
500 | |
501 | size = 128; |
3d88e64d |
502 | text = snewn(size, char); |
65a22376 |
503 | len = 0; |
504 | text[len] = '\0'; |
505 | |
506 | while (1) { |
507 | c = fgetc(fp); |
508 | if (c == '\r' || c == '\n') { |
509 | c = fgetc(fp); |
510 | if (c != '\r' && c != '\n' && c != EOF) |
511 | ungetc(c, fp); |
512 | return text; |
513 | } |
514 | if (c == EOF) { |
515 | sfree(text); |
516 | return NULL; |
517 | } |
518 | if (len + 1 > size) { |
519 | size += 128; |
3d88e64d |
520 | text = sresize(text, size, char); |
65a22376 |
521 | } |
522 | text[len++] = c; |
523 | text[len] = '\0'; |
524 | } |
525 | } |
526 | |
32874aea |
527 | int base64_decode_atom(char *atom, unsigned char *out) |
528 | { |
65a22376 |
529 | int vals[4]; |
530 | int i, v, len; |
531 | unsigned word; |
532 | char c; |
32874aea |
533 | |
65a22376 |
534 | for (i = 0; i < 4; i++) { |
535 | c = atom[i]; |
536 | if (c >= 'A' && c <= 'Z') |
537 | v = c - 'A'; |
538 | else if (c >= 'a' && c <= 'z') |
539 | v = c - 'a' + 26; |
540 | else if (c >= '0' && c <= '9') |
541 | v = c - '0' + 52; |
542 | else if (c == '+') |
543 | v = 62; |
544 | else if (c == '/') |
545 | v = 63; |
546 | else if (c == '=') |
547 | v = -1; |
548 | else |
549 | return 0; /* invalid atom */ |
550 | vals[i] = v; |
551 | } |
552 | |
553 | if (vals[0] == -1 || vals[1] == -1) |
554 | return 0; |
555 | if (vals[2] == -1 && vals[3] != -1) |
556 | return 0; |
557 | |
558 | if (vals[3] != -1) |
559 | len = 3; |
560 | else if (vals[2] != -1) |
561 | len = 2; |
562 | else |
563 | len = 1; |
564 | |
565 | word = ((vals[0] << 18) | |
32874aea |
566 | (vals[1] << 12) | ((vals[2] & 0x3F) << 6) | (vals[3] & 0x3F)); |
65a22376 |
567 | out[0] = (word >> 16) & 0xFF; |
568 | if (len > 1) |
569 | out[1] = (word >> 8) & 0xFF; |
570 | if (len > 2) |
571 | out[2] = word & 0xFF; |
572 | return len; |
573 | } |
574 | |
2247e107 |
575 | static unsigned char *read_blob(FILE * fp, int nlines, int *bloblen) |
32874aea |
576 | { |
65a22376 |
577 | unsigned char *blob; |
578 | char *line; |
579 | int linelen, len; |
580 | int i, j, k; |
581 | |
582 | /* We expect at most 64 base64 characters, ie 48 real bytes, per line. */ |
3d88e64d |
583 | blob = snewn(48 * nlines, unsigned char); |
65a22376 |
584 | len = 0; |
585 | for (i = 0; i < nlines; i++) { |
586 | line = read_body(fp); |
587 | if (!line) { |
588 | sfree(blob); |
589 | return NULL; |
590 | } |
591 | linelen = strlen(line); |
592 | if (linelen % 4 != 0 || linelen > 64) { |
593 | sfree(blob); |
594 | sfree(line); |
595 | return NULL; |
596 | } |
597 | for (j = 0; j < linelen; j += 4) { |
32874aea |
598 | k = base64_decode_atom(line + j, blob + len); |
65a22376 |
599 | if (!k) { |
600 | sfree(line); |
601 | sfree(blob); |
602 | return NULL; |
603 | } |
604 | len += k; |
605 | } |
606 | sfree(line); |
607 | } |
608 | *bloblen = len; |
609 | return blob; |
610 | } |
611 | |
612 | /* |
613 | * Magic error return value for when the passphrase is wrong. |
614 | */ |
615 | struct ssh2_userkey ssh2_wrong_passphrase = { |
616 | NULL, NULL, NULL |
617 | }; |
618 | |
47a6b94c |
619 | const struct ssh_signkey *find_pubkey_alg(const char *name) |
620 | { |
621 | if (!strcmp(name, "ssh-rsa")) |
622 | return &ssh_rsa; |
623 | else if (!strcmp(name, "ssh-dss")) |
624 | return &ssh_dss; |
625 | else |
626 | return NULL; |
627 | } |
628 | |
9a30e26b |
629 | struct ssh2_userkey *ssh2_load_userkey(const Filename *filename, |
222d54dc |
630 | char *passphrase, const char **errorstr) |
32874aea |
631 | { |
65a22376 |
632 | FILE *fp; |
7bedb13c |
633 | char header[40], *b, *encryption, *comment, *mac; |
65a22376 |
634 | const struct ssh_signkey *alg; |
635 | struct ssh2_userkey *ret; |
636 | int cipher, cipherblk; |
637 | unsigned char *public_blob, *private_blob; |
638 | int public_blob_len, private_blob_len; |
7bedb13c |
639 | int i, is_mac, old_fmt; |
5c72ca61 |
640 | int passlen = passphrase ? strlen(passphrase) : 0; |
222d54dc |
641 | const char *error = NULL; |
65a22376 |
642 | |
643 | ret = NULL; /* return NULL for most errors */ |
f545e34b |
644 | encryption = comment = mac = NULL; |
65a22376 |
645 | public_blob = private_blob = NULL; |
646 | |
9a30e26b |
647 | fp = f_open(*filename, "rb"); |
222d54dc |
648 | if (!fp) { |
649 | error = "can't open file"; |
65a22376 |
650 | goto error; |
222d54dc |
651 | } |
65a22376 |
652 | |
653 | /* Read the first header line which contains the key type. */ |
7bedb13c |
654 | if (!read_header(fp, header)) |
655 | goto error; |
656 | if (0 == strcmp(header, "PuTTY-User-Key-File-2")) { |
657 | old_fmt = 0; |
658 | } else if (0 == strcmp(header, "PuTTY-User-Key-File-1")) { |
659 | /* this is an old key file; warn and then continue */ |
660 | old_keyfile_warning(); |
661 | old_fmt = 1; |
222d54dc |
662 | } else { |
663 | error = "not a PuTTY SSH-2 private key"; |
65a22376 |
664 | goto error; |
222d54dc |
665 | } |
666 | error = "file format error"; |
65a22376 |
667 | if ((b = read_body(fp)) == NULL) |
668 | goto error; |
5c72ca61 |
669 | /* Select key algorithm structure. */ |
47a6b94c |
670 | alg = find_pubkey_alg(b); |
671 | if (!alg) { |
65a22376 |
672 | sfree(b); |
673 | goto error; |
674 | } |
675 | sfree(b); |
32874aea |
676 | |
65a22376 |
677 | /* Read the Encryption header line. */ |
32874aea |
678 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
65a22376 |
679 | goto error; |
7bedb13c |
680 | if ((encryption = read_body(fp)) == NULL) |
65a22376 |
681 | goto error; |
7bedb13c |
682 | if (!strcmp(encryption, "aes256-cbc")) { |
32874aea |
683 | cipher = 1; |
684 | cipherblk = 16; |
7bedb13c |
685 | } else if (!strcmp(encryption, "none")) { |
32874aea |
686 | cipher = 0; |
687 | cipherblk = 1; |
65a22376 |
688 | } else { |
7bedb13c |
689 | sfree(encryption); |
65a22376 |
690 | goto error; |
691 | } |
65a22376 |
692 | |
693 | /* Read the Comment header line. */ |
32874aea |
694 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
695 | goto error; |
696 | if ((comment = read_body(fp)) == NULL) |
697 | goto error; |
698 | |
699 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
700 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
701 | goto error; |
702 | if ((b = read_body(fp)) == NULL) |
703 | goto error; |
704 | i = atoi(b); |
705 | sfree(b); |
706 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
707 | goto error; |
708 | |
709 | /* Read the Private-Lines header line and the Private blob. */ |
32874aea |
710 | if (!read_header(fp, header) || 0 != strcmp(header, "Private-Lines")) |
65a22376 |
711 | goto error; |
712 | if ((b = read_body(fp)) == NULL) |
713 | goto error; |
714 | i = atoi(b); |
715 | sfree(b); |
716 | if ((private_blob = read_blob(fp, i, &private_blob_len)) == NULL) |
717 | goto error; |
718 | |
5c72ca61 |
719 | /* Read the Private-MAC or Private-Hash header line. */ |
720 | if (!read_header(fp, header)) |
65a22376 |
721 | goto error; |
5c72ca61 |
722 | if (0 == strcmp(header, "Private-MAC")) { |
723 | if ((mac = read_body(fp)) == NULL) |
724 | goto error; |
725 | is_mac = 1; |
7bedb13c |
726 | } else if (0 == strcmp(header, "Private-Hash") && |
727 | alg == &ssh_rsa && old_fmt) { |
5c72ca61 |
728 | if ((mac = read_body(fp)) == NULL) |
729 | goto error; |
730 | is_mac = 0; |
731 | } else |
65a22376 |
732 | goto error; |
733 | |
734 | fclose(fp); |
735 | fp = NULL; |
736 | |
737 | /* |
738 | * Decrypt the private blob. |
739 | */ |
740 | if (cipher) { |
741 | unsigned char key[40]; |
742 | SHA_State s; |
65a22376 |
743 | |
744 | if (!passphrase) |
745 | goto error; |
746 | if (private_blob_len % cipherblk) |
747 | goto error; |
748 | |
65a22376 |
749 | SHA_Init(&s); |
750 | SHA_Bytes(&s, "\0\0\0\0", 4); |
751 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
752 | SHA_Final(&s, key + 0); |
65a22376 |
753 | SHA_Init(&s); |
754 | SHA_Bytes(&s, "\0\0\0\1", 4); |
755 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
756 | SHA_Final(&s, key + 20); |
65a22376 |
757 | aes256_decrypt_pubkey(key, private_blob, private_blob_len); |
758 | } |
759 | |
760 | /* |
7bedb13c |
761 | * Verify the MAC. |
65a22376 |
762 | */ |
763 | { |
5c72ca61 |
764 | char realmac[41]; |
65a22376 |
765 | unsigned char binary[20]; |
7bedb13c |
766 | unsigned char *macdata; |
767 | int maclen; |
768 | int free_macdata; |
769 | |
770 | if (old_fmt) { |
771 | /* MAC (or hash) only covers the private blob. */ |
772 | macdata = private_blob; |
773 | maclen = private_blob_len; |
774 | free_macdata = 0; |
775 | } else { |
776 | unsigned char *p; |
777 | int namelen = strlen(alg->name); |
778 | int enclen = strlen(encryption); |
779 | int commlen = strlen(comment); |
780 | maclen = (4 + namelen + |
781 | 4 + enclen + |
782 | 4 + commlen + |
783 | 4 + public_blob_len + |
784 | 4 + private_blob_len); |
3d88e64d |
785 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
786 | p = macdata; |
787 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
788 | DO_STR(alg->name, namelen); |
789 | DO_STR(encryption, enclen); |
790 | DO_STR(comment, commlen); |
791 | DO_STR(public_blob, public_blob_len); |
792 | DO_STR(private_blob, private_blob_len); |
793 | |
794 | free_macdata = 1; |
795 | } |
65a22376 |
796 | |
5c72ca61 |
797 | if (is_mac) { |
798 | SHA_State s; |
799 | unsigned char mackey[20]; |
800 | char header[] = "putty-private-key-file-mac-key"; |
801 | |
5c72ca61 |
802 | SHA_Init(&s); |
803 | SHA_Bytes(&s, header, sizeof(header)-1); |
39ace9b0 |
804 | if (cipher && passphrase) |
7bedb13c |
805 | SHA_Bytes(&s, passphrase, passlen); |
5c72ca61 |
806 | SHA_Final(&s, mackey); |
807 | |
7bedb13c |
808 | hmac_sha1_simple(mackey, 20, macdata, maclen, binary); |
5c72ca61 |
809 | |
810 | memset(mackey, 0, sizeof(mackey)); |
811 | memset(&s, 0, sizeof(s)); |
812 | } else { |
7bedb13c |
813 | SHA_Simple(macdata, maclen, binary); |
5c72ca61 |
814 | } |
7bedb13c |
815 | |
816 | if (free_macdata) { |
817 | memset(macdata, 0, maclen); |
818 | sfree(macdata); |
819 | } |
820 | |
65a22376 |
821 | for (i = 0; i < 20; i++) |
5c72ca61 |
822 | sprintf(realmac + 2 * i, "%02x", binary[i]); |
65a22376 |
823 | |
5c72ca61 |
824 | if (strcmp(mac, realmac)) { |
825 | /* An incorrect MAC is an unconditional Error if the key is |
65a22376 |
826 | * unencrypted. Otherwise, it means Wrong Passphrase. */ |
222d54dc |
827 | if (cipher) { |
b81cca98 |
828 | error = "wrong passphrase"; |
222d54dc |
829 | ret = SSH2_WRONG_PASSPHRASE; |
830 | } else { |
831 | error = "MAC failed"; |
832 | ret = NULL; |
833 | } |
65a22376 |
834 | goto error; |
835 | } |
836 | } |
5c72ca61 |
837 | sfree(mac); |
65a22376 |
838 | |
839 | /* |
840 | * Create and return the key. |
841 | */ |
3d88e64d |
842 | ret = snew(struct ssh2_userkey); |
65a22376 |
843 | ret->alg = alg; |
844 | ret->comment = comment; |
845 | ret->data = alg->createkey(public_blob, public_blob_len, |
846 | private_blob, private_blob_len); |
98f022f5 |
847 | if (!ret->data) { |
848 | sfree(ret->comment); |
849 | sfree(ret); |
850 | ret = NULL; |
222d54dc |
851 | error = "createkey failed"; |
852 | goto error; |
98f022f5 |
853 | } |
65a22376 |
854 | sfree(public_blob); |
855 | sfree(private_blob); |
7bedb13c |
856 | sfree(encryption); |
2d8cd396 |
857 | if (errorstr) |
858 | *errorstr = NULL; |
65a22376 |
859 | return ret; |
860 | |
861 | /* |
862 | * Error processing. |
863 | */ |
32874aea |
864 | error: |
865 | if (fp) |
866 | fclose(fp); |
867 | if (comment) |
868 | sfree(comment); |
7bedb13c |
869 | if (encryption) |
870 | sfree(encryption); |
5c72ca61 |
871 | if (mac) |
872 | sfree(mac); |
32874aea |
873 | if (public_blob) |
874 | sfree(public_blob); |
875 | if (private_blob) |
876 | sfree(private_blob); |
222d54dc |
877 | if (errorstr) |
878 | *errorstr = error; |
65a22376 |
879 | return ret; |
880 | } |
881 | |
9a30e26b |
882 | char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm, |
222d54dc |
883 | int *pub_blob_len, const char **errorstr) |
32874aea |
884 | { |
65a22376 |
885 | FILE *fp; |
886 | char header[40], *b; |
887 | const struct ssh_signkey *alg; |
65a22376 |
888 | unsigned char *public_blob; |
889 | int public_blob_len; |
890 | int i; |
222d54dc |
891 | const char *error = NULL; |
65a22376 |
892 | |
893 | public_blob = NULL; |
894 | |
9a30e26b |
895 | fp = f_open(*filename, "rb"); |
222d54dc |
896 | if (!fp) { |
897 | error = "can't open file"; |
65a22376 |
898 | goto error; |
222d54dc |
899 | } |
65a22376 |
900 | |
901 | /* Read the first header line which contains the key type. */ |
32874aea |
902 | if (!read_header(fp, header) |
7bedb13c |
903 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
222d54dc |
904 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) { |
905 | error = "not a PuTTY SSH-2 private key"; |
65a22376 |
906 | goto error; |
222d54dc |
907 | } |
908 | error = "file format error"; |
65a22376 |
909 | if ((b = read_body(fp)) == NULL) |
910 | goto error; |
911 | /* Select key algorithm structure. Currently only ssh-rsa. */ |
47a6b94c |
912 | alg = find_pubkey_alg(b); |
913 | if (!alg) { |
65a22376 |
914 | sfree(b); |
915 | goto error; |
916 | } |
917 | sfree(b); |
32874aea |
918 | |
65a22376 |
919 | /* Read the Encryption header line. */ |
32874aea |
920 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
65a22376 |
921 | goto error; |
922 | if ((b = read_body(fp)) == NULL) |
923 | goto error; |
924 | sfree(b); /* we don't care */ |
925 | |
926 | /* Read the Comment header line. */ |
32874aea |
927 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
928 | goto error; |
929 | if ((b = read_body(fp)) == NULL) |
930 | goto error; |
931 | sfree(b); /* we don't care */ |
932 | |
933 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
934 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
935 | goto error; |
936 | if ((b = read_body(fp)) == NULL) |
937 | goto error; |
938 | i = atoi(b); |
939 | sfree(b); |
940 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
941 | goto error; |
942 | |
943 | fclose(fp); |
3f2d010c |
944 | if (pub_blob_len) |
945 | *pub_blob_len = public_blob_len; |
946 | if (algorithm) |
947 | *algorithm = alg->name; |
2247e107 |
948 | return (char *)public_blob; |
65a22376 |
949 | |
950 | /* |
951 | * Error processing. |
952 | */ |
32874aea |
953 | error: |
954 | if (fp) |
955 | fclose(fp); |
956 | if (public_blob) |
957 | sfree(public_blob); |
222d54dc |
958 | if (errorstr) |
959 | *errorstr = error; |
65a22376 |
960 | return NULL; |
961 | } |
962 | |
9a30e26b |
963 | int ssh2_userkey_encrypted(const Filename *filename, char **commentptr) |
32874aea |
964 | { |
65a22376 |
965 | FILE *fp; |
966 | char header[40], *b, *comment; |
967 | int ret; |
968 | |
32874aea |
969 | if (commentptr) |
970 | *commentptr = NULL; |
65a22376 |
971 | |
9a30e26b |
972 | fp = f_open(*filename, "rb"); |
65a22376 |
973 | if (!fp) |
974 | return 0; |
32874aea |
975 | if (!read_header(fp, header) |
7bedb13c |
976 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
977 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) { |
32874aea |
978 | fclose(fp); |
979 | return 0; |
65a22376 |
980 | } |
981 | if ((b = read_body(fp)) == NULL) { |
32874aea |
982 | fclose(fp); |
983 | return 0; |
65a22376 |
984 | } |
985 | sfree(b); /* we don't care about key type here */ |
986 | /* Read the Encryption header line. */ |
32874aea |
987 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) { |
988 | fclose(fp); |
989 | return 0; |
65a22376 |
990 | } |
991 | if ((b = read_body(fp)) == NULL) { |
32874aea |
992 | fclose(fp); |
993 | return 0; |
65a22376 |
994 | } |
995 | |
996 | /* Read the Comment header line. */ |
32874aea |
997 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) { |
998 | fclose(fp); |
999 | sfree(b); |
1000 | return 1; |
65a22376 |
1001 | } |
1002 | if ((comment = read_body(fp)) == NULL) { |
32874aea |
1003 | fclose(fp); |
1004 | sfree(b); |
1005 | return 1; |
65a22376 |
1006 | } |
1007 | |
32874aea |
1008 | if (commentptr) |
1009 | *commentptr = comment; |
65a22376 |
1010 | |
1011 | fclose(fp); |
1012 | if (!strcmp(b, "aes256-cbc")) |
1013 | ret = 1; |
1014 | else |
1015 | ret = 0; |
1016 | sfree(b); |
1017 | return ret; |
1018 | } |
1019 | |
32874aea |
1020 | int base64_lines(int datalen) |
1021 | { |
65a22376 |
1022 | /* When encoding, we use 64 chars/line, which equals 48 real chars. */ |
32874aea |
1023 | return (datalen + 47) / 48; |
65a22376 |
1024 | } |
1025 | |
96d19bc9 |
1026 | void base64_encode(FILE * fp, unsigned char *data, int datalen, int cpl) |
32874aea |
1027 | { |
65a22376 |
1028 | int linelen = 0; |
1029 | char out[4]; |
96d19bc9 |
1030 | int n, i; |
65a22376 |
1031 | |
1032 | while (datalen > 0) { |
65a22376 |
1033 | n = (datalen < 3 ? datalen : 3); |
1034 | base64_encode_atom(data, n, out); |
1035 | data += n; |
1036 | datalen -= n; |
96d19bc9 |
1037 | for (i = 0; i < 4; i++) { |
1038 | if (linelen >= cpl) { |
1039 | linelen = 0; |
1040 | fputc('\n', fp); |
1041 | } |
1042 | fputc(out[i], fp); |
1043 | linelen++; |
1044 | } |
65a22376 |
1045 | } |
1046 | fputc('\n', fp); |
1047 | } |
1048 | |
9a30e26b |
1049 | int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key, |
32874aea |
1050 | char *passphrase) |
1051 | { |
65a22376 |
1052 | FILE *fp; |
1053 | unsigned char *pub_blob, *priv_blob, *priv_blob_encrypted; |
1054 | int pub_blob_len, priv_blob_len, priv_encrypted_len; |
1055 | int passlen; |
1056 | int cipherblk; |
7bedb13c |
1057 | int i; |
65a22376 |
1058 | char *cipherstr; |
5c72ca61 |
1059 | unsigned char priv_mac[20]; |
65a22376 |
1060 | |
1061 | /* |
1062 | * Fetch the key component blobs. |
1063 | */ |
1064 | pub_blob = key->alg->public_blob(key->data, &pub_blob_len); |
1065 | priv_blob = key->alg->private_blob(key->data, &priv_blob_len); |
1066 | if (!pub_blob || !priv_blob) { |
1067 | sfree(pub_blob); |
1068 | sfree(priv_blob); |
1069 | return 0; |
1070 | } |
1071 | |
1072 | /* |
1073 | * Determine encryption details, and encrypt the private blob. |
1074 | */ |
1075 | if (passphrase) { |
1076 | cipherstr = "aes256-cbc"; |
1077 | cipherblk = 16; |
1078 | } else { |
1079 | cipherstr = "none"; |
1080 | cipherblk = 1; |
1081 | } |
1082 | priv_encrypted_len = priv_blob_len + cipherblk - 1; |
1083 | priv_encrypted_len -= priv_encrypted_len % cipherblk; |
3d88e64d |
1084 | priv_blob_encrypted = snewn(priv_encrypted_len, unsigned char); |
65a22376 |
1085 | memset(priv_blob_encrypted, 0, priv_encrypted_len); |
1086 | memcpy(priv_blob_encrypted, priv_blob, priv_blob_len); |
1087 | /* Create padding based on the SHA hash of the unpadded blob. This prevents |
1088 | * too easy a known-plaintext attack on the last block. */ |
5c72ca61 |
1089 | SHA_Simple(priv_blob, priv_blob_len, priv_mac); |
65a22376 |
1090 | assert(priv_encrypted_len - priv_blob_len < 20); |
5c72ca61 |
1091 | memcpy(priv_blob_encrypted + priv_blob_len, priv_mac, |
65a22376 |
1092 | priv_encrypted_len - priv_blob_len); |
1093 | |
7bedb13c |
1094 | /* Now create the MAC. */ |
1095 | { |
1096 | unsigned char *macdata; |
1097 | int maclen; |
1098 | unsigned char *p; |
1099 | int namelen = strlen(key->alg->name); |
1100 | int enclen = strlen(cipherstr); |
1101 | int commlen = strlen(key->comment); |
5c72ca61 |
1102 | SHA_State s; |
1103 | unsigned char mackey[20]; |
1104 | char header[] = "putty-private-key-file-mac-key"; |
1105 | |
7bedb13c |
1106 | maclen = (4 + namelen + |
1107 | 4 + enclen + |
1108 | 4 + commlen + |
1109 | 4 + pub_blob_len + |
1110 | 4 + priv_encrypted_len); |
3d88e64d |
1111 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
1112 | p = macdata; |
1113 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
1114 | DO_STR(key->alg->name, namelen); |
1115 | DO_STR(cipherstr, enclen); |
1116 | DO_STR(key->comment, commlen); |
1117 | DO_STR(pub_blob, pub_blob_len); |
1118 | DO_STR(priv_blob_encrypted, priv_encrypted_len); |
5c72ca61 |
1119 | |
1120 | SHA_Init(&s); |
1121 | SHA_Bytes(&s, header, sizeof(header)-1); |
7bedb13c |
1122 | if (passphrase) |
1123 | SHA_Bytes(&s, passphrase, strlen(passphrase)); |
5c72ca61 |
1124 | SHA_Final(&s, mackey); |
7bedb13c |
1125 | hmac_sha1_simple(mackey, 20, macdata, maclen, priv_mac); |
1126 | memset(macdata, 0, maclen); |
1127 | sfree(macdata); |
5c72ca61 |
1128 | memset(mackey, 0, sizeof(mackey)); |
1129 | memset(&s, 0, sizeof(s)); |
5c72ca61 |
1130 | } |
65a22376 |
1131 | |
1132 | if (passphrase) { |
2247e107 |
1133 | unsigned char key[40]; |
65a22376 |
1134 | SHA_State s; |
1135 | |
1136 | passlen = strlen(passphrase); |
1137 | |
1138 | SHA_Init(&s); |
1139 | SHA_Bytes(&s, "\0\0\0\0", 4); |
1140 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1141 | SHA_Final(&s, key + 0); |
65a22376 |
1142 | SHA_Init(&s); |
1143 | SHA_Bytes(&s, "\0\0\0\1", 4); |
1144 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1145 | SHA_Final(&s, key + 20); |
1146 | aes256_encrypt_pubkey(key, priv_blob_encrypted, |
1147 | priv_encrypted_len); |
5c72ca61 |
1148 | |
1149 | memset(key, 0, sizeof(key)); |
1150 | memset(&s, 0, sizeof(s)); |
65a22376 |
1151 | } |
1152 | |
9a30e26b |
1153 | fp = f_open(*filename, "w"); |
65a22376 |
1154 | if (!fp) |
1155 | return 0; |
7bedb13c |
1156 | fprintf(fp, "PuTTY-User-Key-File-2: %s\n", key->alg->name); |
65a22376 |
1157 | fprintf(fp, "Encryption: %s\n", cipherstr); |
1158 | fprintf(fp, "Comment: %s\n", key->comment); |
1159 | fprintf(fp, "Public-Lines: %d\n", base64_lines(pub_blob_len)); |
96d19bc9 |
1160 | base64_encode(fp, pub_blob, pub_blob_len, 64); |
65a22376 |
1161 | fprintf(fp, "Private-Lines: %d\n", base64_lines(priv_encrypted_len)); |
96d19bc9 |
1162 | base64_encode(fp, priv_blob_encrypted, priv_encrypted_len, 64); |
7bedb13c |
1163 | fprintf(fp, "Private-MAC: "); |
65a22376 |
1164 | for (i = 0; i < 20; i++) |
5c72ca61 |
1165 | fprintf(fp, "%02x", priv_mac[i]); |
65a22376 |
1166 | fprintf(fp, "\n"); |
1167 | fclose(fp); |
7bedb13c |
1168 | |
1169 | sfree(pub_blob); |
1170 | memset(priv_blob, 0, priv_blob_len); |
1171 | sfree(priv_blob); |
1172 | sfree(priv_blob_encrypted); |
65a22376 |
1173 | return 1; |
1174 | } |
1175 | |
1176 | /* ---------------------------------------------------------------------- |
231ee168 |
1177 | * A function to determine the type of a private key file. Returns |
1178 | * 0 on failure, 1 or 2 on success. |
65a22376 |
1179 | */ |
9a30e26b |
1180 | int key_type(const Filename *filename) |
32874aea |
1181 | { |
65a22376 |
1182 | FILE *fp; |
231ee168 |
1183 | char buf[32]; |
1184 | const char putty2_sig[] = "PuTTY-User-Key-File-"; |
1185 | const char sshcom_sig[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT"; |
1186 | const char openssh_sig[] = "-----BEGIN "; |
65a22376 |
1187 | int i; |
1188 | |
9a30e26b |
1189 | fp = f_open(*filename, "r"); |
65a22376 |
1190 | if (!fp) |
231ee168 |
1191 | return SSH_KEYTYPE_UNOPENABLE; |
1192 | i = fread(buf, 1, sizeof(buf), fp); |
65a22376 |
1193 | fclose(fp); |
231ee168 |
1194 | if (i < 0) |
1195 | return SSH_KEYTYPE_UNOPENABLE; |
1196 | if (i < 32) |
1197 | return SSH_KEYTYPE_UNKNOWN; |
1198 | if (!memcmp(buf, rsa_signature, sizeof(rsa_signature)-1)) |
1199 | return SSH_KEYTYPE_SSH1; |
1200 | if (!memcmp(buf, putty2_sig, sizeof(putty2_sig)-1)) |
1201 | return SSH_KEYTYPE_SSH2; |
1202 | if (!memcmp(buf, openssh_sig, sizeof(openssh_sig)-1)) |
1203 | return SSH_KEYTYPE_OPENSSH; |
1204 | if (!memcmp(buf, sshcom_sig, sizeof(sshcom_sig)-1)) |
1205 | return SSH_KEYTYPE_SSHCOM; |
1206 | return SSH_KEYTYPE_UNKNOWN; /* unrecognised or EOF */ |
1207 | } |
1208 | |
1209 | /* |
1210 | * Convert the type word to a string, for `wrong type' error |
1211 | * messages. |
1212 | */ |
1213 | char *key_type_to_str(int type) |
1214 | { |
1215 | switch (type) { |
1216 | case SSH_KEYTYPE_UNOPENABLE: return "unable to open file"; break; |
1217 | case SSH_KEYTYPE_UNKNOWN: return "not a private key"; break; |
1218 | case SSH_KEYTYPE_SSH1: return "SSH1 private key"; break; |
1219 | case SSH_KEYTYPE_SSH2: return "PuTTY SSH2 private key"; break; |
1220 | case SSH_KEYTYPE_OPENSSH: return "OpenSSH SSH2 private key"; break; |
1221 | case SSH_KEYTYPE_SSHCOM: return "ssh.com SSH2 private key"; break; |
1222 | default: return "INTERNAL ERROR"; break; |
1223 | } |
65a22376 |
1224 | } |