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