3eca8453 |
1 | /* |
a52f067e |
2 | * Generic SSH public-key handling operations. In particular, |
3 | * reading of SSH public-key files, and also the generic `sign' |
2e85c969 |
4 | * operation for SSH-2 (which checks the type of the key and |
a52f067e |
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 | |
3eca8453 |
16 | #define rsa_signature "SSH PRIVATE KEY FILE FORMAT 1.1\n" |
17 | |
a52f067e |
18 | #define BASE64_TOINT(x) ( (x)-'A'<26 ? (x)-'A'+0 :\ |
19 | (x)-'a'<26 ? (x)-'a'+26 :\ |
20 | (x)-'0'<10 ? (x)-'0'+52 :\ |
21 | (x)=='+' ? 62 : \ |
22 | (x)=='/' ? 63 : 0 ) |
23 | |
3f2d010c |
24 | static int loadrsakey_main(FILE * fp, struct RSAKey *key, int pub_only, |
222d54dc |
25 | char **commentptr, char *passphrase, |
26 | const char **error) |
32874aea |
27 | { |
3eca8453 |
28 | unsigned char buf[16384]; |
29 | unsigned char keybuf[16]; |
30 | int len; |
31 | int i, j, ciphertype; |
32 | int ret = 0; |
33 | struct MD5Context md5c; |
a52f067e |
34 | char *comment; |
3eca8453 |
35 | |
222d54dc |
36 | *error = NULL; |
37 | |
a52f067e |
38 | /* Slurp the whole file (minus the header) into a buffer. */ |
3eca8453 |
39 | len = fread(buf, 1, sizeof(buf), fp); |
40 | fclose(fp); |
222d54dc |
41 | if (len < 0 || len == sizeof(buf)) { |
42 | *error = "error reading file"; |
32874aea |
43 | goto end; /* file too big or not read */ |
222d54dc |
44 | } |
3eca8453 |
45 | |
a52f067e |
46 | i = 0; |
222d54dc |
47 | *error = "file format error"; |
3eca8453 |
48 | |
a52f067e |
49 | /* |
50 | * A zero byte. (The signature includes a terminating NUL.) |
51 | */ |
32874aea |
52 | if (len - i < 1 || buf[i] != 0) |
53 | goto end; |
a52f067e |
54 | i++; |
3eca8453 |
55 | |
a52f067e |
56 | /* One byte giving encryption type, and one reserved uint32. */ |
32874aea |
57 | if (len - i < 1) |
58 | goto end; |
3eca8453 |
59 | ciphertype = buf[i]; |
60 | if (ciphertype != 0 && ciphertype != SSH_CIPHER_3DES) |
32874aea |
61 | goto end; |
3eca8453 |
62 | i++; |
32874aea |
63 | if (len - i < 4) |
64 | goto end; /* reserved field not present */ |
65 | if (buf[i] != 0 || buf[i + 1] != 0 || buf[i + 2] != 0 |
66 | || buf[i + 3] != 0) goto end; /* reserved field nonzero, panic! */ |
3eca8453 |
67 | i += 4; |
68 | |
2e85c969 |
69 | /* Now the serious stuff. An ordinary SSH-1 public key. */ |
0016d70b |
70 | i += makekey(buf + i, len, key, NULL, 1); |
71 | if (i < 0) |
32874aea |
72 | goto end; /* overran */ |
3eca8453 |
73 | |
74 | /* Next, the comment field. */ |
32874aea |
75 | j = GET_32BIT(buf + i); |
5c58ad2d |
76 | i += 4; |
32874aea |
77 | if (len - i < j) |
78 | goto end; |
3d88e64d |
79 | comment = snewn(j + 1, char); |
a52f067e |
80 | if (comment) { |
32874aea |
81 | memcpy(comment, buf + i, j); |
82 | comment[j] = '\0'; |
5c58ad2d |
83 | } |
84 | i += j; |
a52f067e |
85 | if (commentptr) |
d4963650 |
86 | *commentptr = dupstr(comment); |
a52f067e |
87 | if (key) |
32874aea |
88 | key->comment = comment; |
d4963650 |
89 | else |
90 | sfree(comment); |
91 | |
92 | if (pub_only) { |
93 | ret = 1; |
94 | goto end; |
95 | } |
96 | |
a52f067e |
97 | if (!key) { |
222d54dc |
98 | ret = ciphertype != 0; |
99 | *error = NULL; |
100 | goto end; |
a52f067e |
101 | } |
3eca8453 |
102 | |
103 | /* |
104 | * Decrypt remainder of buffer. |
105 | */ |
106 | if (ciphertype) { |
32874aea |
107 | MD5Init(&md5c); |
2247e107 |
108 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
109 | MD5Final(keybuf, &md5c); |
110 | des3_decrypt_pubkey(keybuf, buf + i, (len - i + 7) & ~7); |
111 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
3eca8453 |
112 | } |
113 | |
114 | /* |
115 | * We are now in the secret part of the key. The first four |
116 | * bytes should be of the form a, b, a, b. |
117 | */ |
32874aea |
118 | if (len - i < 4) |
119 | goto end; |
120 | if (buf[i] != buf[i + 2] || buf[i + 1] != buf[i + 3]) { |
222d54dc |
121 | *error = "wrong passphrase"; |
32874aea |
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 | */ |
0016d70b |
132 | j = makeprivate(buf + i, len - i, key); |
133 | if (j < 0) goto end; |
134 | i += j; |
135 | j = ssh1_read_bignum(buf + i, len - i, &key->iqmp); |
136 | if (j < 0) goto end; |
137 | i += j; |
138 | j = ssh1_read_bignum(buf + i, len - i, &key->q); |
139 | if (j < 0) goto end; |
140 | i += j; |
141 | j = ssh1_read_bignum(buf + i, len - i, &key->p); |
142 | if (j < 0) goto end; |
143 | i += j; |
3eca8453 |
144 | |
98f022f5 |
145 | if (!rsa_verify(key)) { |
222d54dc |
146 | *error = "rsa_verify failed"; |
98f022f5 |
147 | freersakey(key); |
148 | ret = 0; |
149 | } else |
150 | ret = 1; |
151 | |
32874aea |
152 | end: |
3eca8453 |
153 | memset(buf, 0, sizeof(buf)); /* burn the evidence */ |
154 | return ret; |
155 | } |
156 | |
222d54dc |
157 | int loadrsakey(const Filename *filename, struct RSAKey *key, char *passphrase, |
158 | const char **errorstr) |
32874aea |
159 | { |
3eca8453 |
160 | FILE *fp; |
2247e107 |
161 | char buf[64]; |
222d54dc |
162 | int ret = 0; |
163 | const char *error = NULL; |
3eca8453 |
164 | |
c6940f12 |
165 | fp = f_open(*filename, "rb", FALSE); |
222d54dc |
166 | if (!fp) { |
167 | error = "can't open file"; |
168 | goto end; |
169 | } |
3eca8453 |
170 | |
a52f067e |
171 | /* |
172 | * Read the first line of the file and see if it's a v1 private |
173 | * key file. |
174 | */ |
32874aea |
175 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
e19fadd7 |
176 | /* |
177 | * This routine will take care of calling fclose() for us. |
178 | */ |
222d54dc |
179 | ret = loadrsakey_main(fp, key, FALSE, NULL, passphrase, &error); |
47a6b94c |
180 | fp = NULL; |
222d54dc |
181 | goto end; |
a52f067e |
182 | } |
183 | |
184 | /* |
185 | * Otherwise, we have nothing. Return empty-handed. |
186 | */ |
222d54dc |
187 | error = "not an SSH-1 RSA file"; |
188 | |
189 | end: |
47a6b94c |
190 | if (fp) |
191 | fclose(fp); |
222d54dc |
192 | if ((ret != 1) && errorstr) |
193 | *errorstr = error; |
194 | return ret; |
3eca8453 |
195 | } |
a52f067e |
196 | |
197 | /* |
198 | * See whether an RSA key is encrypted. Return its comment field as |
199 | * well. |
200 | */ |
9a30e26b |
201 | int rsakey_encrypted(const Filename *filename, char **comment) |
32874aea |
202 | { |
a52f067e |
203 | FILE *fp; |
2247e107 |
204 | char buf[64]; |
a52f067e |
205 | |
c6940f12 |
206 | fp = f_open(*filename, "rb", FALSE); |
a52f067e |
207 | if (!fp) |
32874aea |
208 | return 0; /* doesn't even exist */ |
a52f067e |
209 | |
210 | /* |
211 | * Read the first line of the file and see if it's a v1 private |
212 | * key file. |
213 | */ |
32874aea |
214 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
222d54dc |
215 | const char *dummy; |
e19fadd7 |
216 | /* |
217 | * This routine will take care of calling fclose() for us. |
218 | */ |
222d54dc |
219 | return loadrsakey_main(fp, NULL, FALSE, comment, NULL, &dummy); |
a52f067e |
220 | } |
404f728b |
221 | fclose(fp); |
32874aea |
222 | return 0; /* wasn't the right kind of file */ |
a52f067e |
223 | } |
6e522441 |
224 | |
225 | /* |
3f2d010c |
226 | * Return a malloc'ed chunk of memory containing the public blob of |
227 | * an RSA key, as given in the agent protocol (modulus bits, |
228 | * exponent, modulus). |
229 | */ |
222d54dc |
230 | int rsakey_pubblob(const Filename *filename, void **blob, int *bloblen, |
4bcf919e |
231 | char **commentptr, const char **errorstr) |
3f2d010c |
232 | { |
233 | FILE *fp; |
2247e107 |
234 | char buf[64]; |
3f2d010c |
235 | struct RSAKey key; |
236 | int ret; |
222d54dc |
237 | const char *error = NULL; |
3f2d010c |
238 | |
239 | /* Default return if we fail. */ |
240 | *blob = NULL; |
241 | *bloblen = 0; |
242 | ret = 0; |
243 | |
c6940f12 |
244 | fp = f_open(*filename, "rb", FALSE); |
222d54dc |
245 | if (!fp) { |
246 | error = "can't open file"; |
247 | goto end; |
248 | } |
3f2d010c |
249 | |
250 | /* |
251 | * Read the first line of the file and see if it's a v1 private |
252 | * key file. |
253 | */ |
254 | if (fgets(buf, sizeof(buf), fp) && !strcmp(buf, rsa_signature)) { |
255 | memset(&key, 0, sizeof(key)); |
4bcf919e |
256 | if (loadrsakey_main(fp, &key, TRUE, commentptr, NULL, &error)) { |
3f2d010c |
257 | *blob = rsa_public_blob(&key, bloblen); |
258 | freersakey(&key); |
259 | ret = 1; |
47a6b94c |
260 | fp = NULL; |
3f2d010c |
261 | } |
222d54dc |
262 | } else { |
263 | error = "not an SSH-1 RSA file"; |
3f2d010c |
264 | } |
222d54dc |
265 | |
266 | end: |
e19fadd7 |
267 | if (fp) |
268 | fclose(fp); |
222d54dc |
269 | if ((ret != 1) && errorstr) |
270 | *errorstr = error; |
3f2d010c |
271 | return ret; |
272 | } |
273 | |
274 | /* |
6e522441 |
275 | * Save an RSA key file. Return nonzero on success. |
276 | */ |
9a30e26b |
277 | int saversakey(const Filename *filename, struct RSAKey *key, char *passphrase) |
32874aea |
278 | { |
6e522441 |
279 | unsigned char buf[16384]; |
280 | unsigned char keybuf[16]; |
281 | struct MD5Context md5c; |
49bad831 |
282 | unsigned char *p, *estart; |
6e522441 |
283 | FILE *fp; |
284 | |
285 | /* |
286 | * Write the initial signature. |
287 | */ |
288 | p = buf; |
289 | memcpy(p, rsa_signature, sizeof(rsa_signature)); |
290 | p += sizeof(rsa_signature); |
291 | |
292 | /* |
293 | * One byte giving encryption type, and one reserved (zero) |
294 | * uint32. |
295 | */ |
296 | *p++ = (passphrase ? SSH_CIPHER_3DES : 0); |
32874aea |
297 | PUT_32BIT(p, 0); |
298 | p += 4; |
6e522441 |
299 | |
300 | /* |
2e85c969 |
301 | * An ordinary SSH-1 public key consists of: a uint32 |
6e522441 |
302 | * containing the bit count, then two bignums containing the |
303 | * modulus and exponent respectively. |
304 | */ |
32874aea |
305 | PUT_32BIT(p, bignum_bitcount(key->modulus)); |
306 | p += 4; |
6e522441 |
307 | p += ssh1_write_bignum(p, key->modulus); |
308 | p += ssh1_write_bignum(p, key->exponent); |
309 | |
310 | /* |
311 | * A string containing the comment field. |
312 | */ |
313 | if (key->comment) { |
32874aea |
314 | PUT_32BIT(p, strlen(key->comment)); |
315 | p += 4; |
316 | memcpy(p, key->comment, strlen(key->comment)); |
317 | p += strlen(key->comment); |
6e522441 |
318 | } else { |
32874aea |
319 | PUT_32BIT(p, 0); |
320 | p += 4; |
6e522441 |
321 | } |
322 | |
323 | /* |
324 | * The encrypted portion starts here. |
325 | */ |
326 | estart = p; |
327 | |
328 | /* |
329 | * Two bytes, then the same two bytes repeated. |
330 | */ |
331 | *p++ = random_byte(); |
332 | *p++ = random_byte(); |
32874aea |
333 | p[0] = p[-2]; |
334 | p[1] = p[-1]; |
335 | p += 2; |
6e522441 |
336 | |
337 | /* |
338 | * Four more bignums: the decryption exponent, then iqmp, then |
339 | * q, then p. |
340 | */ |
341 | p += ssh1_write_bignum(p, key->private_exponent); |
65a22376 |
342 | p += ssh1_write_bignum(p, key->iqmp); |
343 | p += ssh1_write_bignum(p, key->q); |
344 | p += ssh1_write_bignum(p, key->p); |
6e522441 |
345 | |
346 | /* |
347 | * Now write zeros until the encrypted portion is a multiple of |
348 | * 8 bytes. |
349 | */ |
32874aea |
350 | while ((p - estart) % 8) |
351 | *p++ = '\0'; |
6e522441 |
352 | |
353 | /* |
354 | * Now encrypt the encrypted portion. |
355 | */ |
356 | if (passphrase) { |
32874aea |
357 | MD5Init(&md5c); |
2247e107 |
358 | MD5Update(&md5c, (unsigned char *)passphrase, strlen(passphrase)); |
32874aea |
359 | MD5Final(keybuf, &md5c); |
360 | des3_encrypt_pubkey(keybuf, estart, p - estart); |
361 | memset(keybuf, 0, sizeof(keybuf)); /* burn the evidence */ |
6e522441 |
362 | } |
363 | |
364 | /* |
365 | * Done. Write the result to the file. |
366 | */ |
c6940f12 |
367 | fp = f_open(*filename, "wb", TRUE); |
6e522441 |
368 | if (fp) { |
32874aea |
369 | int ret = (fwrite(buf, 1, p - buf, fp) == (size_t) (p - buf)); |
6402ecf9 |
370 | if (fclose(fp)) |
371 | ret = 0; |
32874aea |
372 | return ret; |
6e522441 |
373 | } else |
32874aea |
374 | return 0; |
6e522441 |
375 | } |
65a22376 |
376 | |
377 | /* ---------------------------------------------------------------------- |
2e85c969 |
378 | * SSH-2 private key load/store functions. |
65a22376 |
379 | */ |
380 | |
381 | /* |
2e85c969 |
382 | * PuTTY's own format for SSH-2 keys is as follows: |
5c72ca61 |
383 | * |
65a22376 |
384 | * The file is text. Lines are terminated by CRLF, although CR-only |
385 | * and LF-only are tolerated on input. |
5c72ca61 |
386 | * |
7bedb13c |
387 | * The first line says "PuTTY-User-Key-File-2: " plus the name of the |
5c72ca61 |
388 | * algorithm ("ssh-dss", "ssh-rsa" etc). |
389 | * |
65a22376 |
390 | * The next line says "Encryption: " plus an encryption type. |
391 | * Currently the only supported encryption types are "aes256-cbc" |
392 | * and "none". |
5c72ca61 |
393 | * |
65a22376 |
394 | * The next line says "Comment: " plus the comment string. |
5c72ca61 |
395 | * |
65a22376 |
396 | * Next there is a line saying "Public-Lines: " plus a number N. |
397 | * The following N lines contain a base64 encoding of the public |
2e85c969 |
398 | * part of the key. This is encoded as the standard SSH-2 public key |
65a22376 |
399 | * blob (with no initial length): so for RSA, for example, it will |
400 | * read |
5c72ca61 |
401 | * |
65a22376 |
402 | * string "ssh-rsa" |
403 | * mpint exponent |
404 | * mpint modulus |
5c72ca61 |
405 | * |
65a22376 |
406 | * Next, there is a line saying "Private-Lines: " plus a number N, |
407 | * and then N lines containing the (potentially encrypted) private |
408 | * part of the key. For the key type "ssh-rsa", this will be |
409 | * composed of |
5c72ca61 |
410 | * |
65a22376 |
411 | * mpint private_exponent |
412 | * mpint p (the larger of the two primes) |
413 | * mpint q (the smaller prime) |
414 | * mpint iqmp (the inverse of q modulo p) |
415 | * data padding (to reach a multiple of the cipher block size) |
5c72ca61 |
416 | * |
417 | * And for "ssh-dss", it will be composed of |
418 | * |
419 | * mpint x (the private key parameter) |
7bedb13c |
420 | * [ string hash 20-byte hash of mpints p || q || g only in old format ] |
5c72ca61 |
421 | * |
7bedb13c |
422 | * Finally, there is a line saying "Private-MAC: " plus a hex |
423 | * representation of a HMAC-SHA-1 of: |
424 | * |
425 | * string name of algorithm ("ssh-dss", "ssh-rsa") |
426 | * string encryption type |
427 | * string comment |
428 | * string public-blob |
429 | * string private-plaintext (the plaintext version of the |
430 | * private part, including the final |
431 | * padding) |
65a22376 |
432 | * |
5c72ca61 |
433 | * The key to the MAC is itself a SHA-1 hash of: |
65a22376 |
434 | * |
5c72ca61 |
435 | * data "putty-private-key-file-mac-key" |
436 | * data passphrase |
437 | * |
28ad39e0 |
438 | * (An empty passphrase is used for unencrypted keys.) |
5c72ca61 |
439 | * |
65a22376 |
440 | * If the key is encrypted, the encryption key is derived from the |
441 | * passphrase by means of a succession of SHA-1 hashes. Each hash |
442 | * is the hash of: |
5c72ca61 |
443 | * |
65a22376 |
444 | * uint32 sequence-number |
5c72ca61 |
445 | * data passphrase |
446 | * |
65a22376 |
447 | * where the sequence-number increases from zero. As many of these |
448 | * hashes are used as necessary. |
5c72ca61 |
449 | * |
7bedb13c |
450 | * For backwards compatibility with snapshots between 0.51 and |
451 | * 0.52, we also support the older key file format, which begins |
452 | * with "PuTTY-User-Key-File-1" (version number differs). In this |
453 | * format the Private-MAC: field only covers the private-plaintext |
454 | * field and nothing else (and without the 4-byte string length on |
a92a9524 |
455 | * the front too). Moreover, the Private-MAC: field can be replaced |
456 | * with a Private-Hash: field which is a plain SHA-1 hash instead of |
457 | * an HMAC (this was generated for unencrypted keys). |
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 | } |
fe41296f |
508 | if (len + 1 >= size) { |
65a22376 |
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 | |
47a6b94c |
609 | const struct ssh_signkey *find_pubkey_alg(const char *name) |
610 | { |
611 | if (!strcmp(name, "ssh-rsa")) |
612 | return &ssh_rsa; |
613 | else if (!strcmp(name, "ssh-dss")) |
614 | return &ssh_dss; |
615 | else |
616 | return NULL; |
617 | } |
618 | |
9a30e26b |
619 | struct ssh2_userkey *ssh2_load_userkey(const Filename *filename, |
222d54dc |
620 | char *passphrase, const char **errorstr) |
32874aea |
621 | { |
65a22376 |
622 | FILE *fp; |
7bedb13c |
623 | char header[40], *b, *encryption, *comment, *mac; |
65a22376 |
624 | const struct ssh_signkey *alg; |
625 | struct ssh2_userkey *ret; |
626 | int cipher, cipherblk; |
627 | unsigned char *public_blob, *private_blob; |
628 | int public_blob_len, private_blob_len; |
7bedb13c |
629 | int i, is_mac, old_fmt; |
5c72ca61 |
630 | int passlen = passphrase ? strlen(passphrase) : 0; |
222d54dc |
631 | const char *error = NULL; |
65a22376 |
632 | |
633 | ret = NULL; /* return NULL for most errors */ |
f545e34b |
634 | encryption = comment = mac = NULL; |
65a22376 |
635 | public_blob = private_blob = NULL; |
636 | |
c6940f12 |
637 | fp = f_open(*filename, "rb", FALSE); |
222d54dc |
638 | if (!fp) { |
639 | error = "can't open file"; |
65a22376 |
640 | goto error; |
222d54dc |
641 | } |
65a22376 |
642 | |
643 | /* Read the first header line which contains the key type. */ |
7bedb13c |
644 | if (!read_header(fp, header)) |
645 | goto error; |
646 | if (0 == strcmp(header, "PuTTY-User-Key-File-2")) { |
647 | old_fmt = 0; |
648 | } else if (0 == strcmp(header, "PuTTY-User-Key-File-1")) { |
649 | /* this is an old key file; warn and then continue */ |
650 | old_keyfile_warning(); |
651 | old_fmt = 1; |
222d54dc |
652 | } else { |
653 | error = "not a PuTTY SSH-2 private key"; |
65a22376 |
654 | goto error; |
222d54dc |
655 | } |
656 | error = "file format error"; |
65a22376 |
657 | if ((b = read_body(fp)) == NULL) |
658 | goto error; |
5c72ca61 |
659 | /* Select key algorithm structure. */ |
47a6b94c |
660 | alg = find_pubkey_alg(b); |
661 | if (!alg) { |
65a22376 |
662 | sfree(b); |
663 | goto error; |
664 | } |
665 | sfree(b); |
32874aea |
666 | |
65a22376 |
667 | /* Read the Encryption header line. */ |
32874aea |
668 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
65a22376 |
669 | goto error; |
7bedb13c |
670 | if ((encryption = read_body(fp)) == NULL) |
65a22376 |
671 | goto error; |
7bedb13c |
672 | if (!strcmp(encryption, "aes256-cbc")) { |
32874aea |
673 | cipher = 1; |
674 | cipherblk = 16; |
7bedb13c |
675 | } else if (!strcmp(encryption, "none")) { |
32874aea |
676 | cipher = 0; |
677 | cipherblk = 1; |
65a22376 |
678 | } else { |
7bedb13c |
679 | sfree(encryption); |
65a22376 |
680 | goto error; |
681 | } |
65a22376 |
682 | |
683 | /* Read the Comment header line. */ |
32874aea |
684 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
685 | goto error; |
686 | if ((comment = read_body(fp)) == NULL) |
687 | goto error; |
688 | |
689 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
690 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
691 | goto error; |
692 | if ((b = read_body(fp)) == NULL) |
693 | goto error; |
694 | i = atoi(b); |
695 | sfree(b); |
696 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
697 | goto error; |
698 | |
699 | /* Read the Private-Lines header line and the Private blob. */ |
32874aea |
700 | if (!read_header(fp, header) || 0 != strcmp(header, "Private-Lines")) |
65a22376 |
701 | goto error; |
702 | if ((b = read_body(fp)) == NULL) |
703 | goto error; |
704 | i = atoi(b); |
705 | sfree(b); |
706 | if ((private_blob = read_blob(fp, i, &private_blob_len)) == NULL) |
707 | goto error; |
708 | |
5c72ca61 |
709 | /* Read the Private-MAC or Private-Hash header line. */ |
710 | if (!read_header(fp, header)) |
65a22376 |
711 | goto error; |
5c72ca61 |
712 | if (0 == strcmp(header, "Private-MAC")) { |
713 | if ((mac = read_body(fp)) == NULL) |
714 | goto error; |
715 | is_mac = 1; |
a92a9524 |
716 | } else if (0 == strcmp(header, "Private-Hash") && old_fmt) { |
5c72ca61 |
717 | if ((mac = read_body(fp)) == NULL) |
718 | goto error; |
719 | is_mac = 0; |
720 | } else |
65a22376 |
721 | goto error; |
722 | |
723 | fclose(fp); |
724 | fp = NULL; |
725 | |
726 | /* |
727 | * Decrypt the private blob. |
728 | */ |
729 | if (cipher) { |
730 | unsigned char key[40]; |
731 | SHA_State s; |
65a22376 |
732 | |
733 | if (!passphrase) |
734 | goto error; |
735 | if (private_blob_len % cipherblk) |
736 | goto error; |
737 | |
65a22376 |
738 | SHA_Init(&s); |
739 | SHA_Bytes(&s, "\0\0\0\0", 4); |
740 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
741 | SHA_Final(&s, key + 0); |
65a22376 |
742 | SHA_Init(&s); |
743 | SHA_Bytes(&s, "\0\0\0\1", 4); |
744 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
745 | SHA_Final(&s, key + 20); |
65a22376 |
746 | aes256_decrypt_pubkey(key, private_blob, private_blob_len); |
747 | } |
748 | |
749 | /* |
7bedb13c |
750 | * Verify the MAC. |
65a22376 |
751 | */ |
752 | { |
5c72ca61 |
753 | char realmac[41]; |
65a22376 |
754 | unsigned char binary[20]; |
7bedb13c |
755 | unsigned char *macdata; |
756 | int maclen; |
757 | int free_macdata; |
758 | |
759 | if (old_fmt) { |
760 | /* MAC (or hash) only covers the private blob. */ |
761 | macdata = private_blob; |
762 | maclen = private_blob_len; |
763 | free_macdata = 0; |
764 | } else { |
765 | unsigned char *p; |
766 | int namelen = strlen(alg->name); |
767 | int enclen = strlen(encryption); |
768 | int commlen = strlen(comment); |
769 | maclen = (4 + namelen + |
770 | 4 + enclen + |
771 | 4 + commlen + |
772 | 4 + public_blob_len + |
773 | 4 + private_blob_len); |
3d88e64d |
774 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
775 | p = macdata; |
776 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
777 | DO_STR(alg->name, namelen); |
778 | DO_STR(encryption, enclen); |
779 | DO_STR(comment, commlen); |
780 | DO_STR(public_blob, public_blob_len); |
781 | DO_STR(private_blob, private_blob_len); |
782 | |
783 | free_macdata = 1; |
784 | } |
65a22376 |
785 | |
5c72ca61 |
786 | if (is_mac) { |
787 | SHA_State s; |
788 | unsigned char mackey[20]; |
789 | char header[] = "putty-private-key-file-mac-key"; |
790 | |
5c72ca61 |
791 | SHA_Init(&s); |
792 | SHA_Bytes(&s, header, sizeof(header)-1); |
39ace9b0 |
793 | if (cipher && passphrase) |
7bedb13c |
794 | SHA_Bytes(&s, passphrase, passlen); |
5c72ca61 |
795 | SHA_Final(&s, mackey); |
796 | |
7bedb13c |
797 | hmac_sha1_simple(mackey, 20, macdata, maclen, binary); |
5c72ca61 |
798 | |
799 | memset(mackey, 0, sizeof(mackey)); |
800 | memset(&s, 0, sizeof(s)); |
801 | } else { |
7bedb13c |
802 | SHA_Simple(macdata, maclen, binary); |
5c72ca61 |
803 | } |
7bedb13c |
804 | |
805 | if (free_macdata) { |
806 | memset(macdata, 0, maclen); |
807 | sfree(macdata); |
808 | } |
809 | |
65a22376 |
810 | for (i = 0; i < 20; i++) |
5c72ca61 |
811 | sprintf(realmac + 2 * i, "%02x", binary[i]); |
65a22376 |
812 | |
5c72ca61 |
813 | if (strcmp(mac, realmac)) { |
814 | /* An incorrect MAC is an unconditional Error if the key is |
65a22376 |
815 | * unencrypted. Otherwise, it means Wrong Passphrase. */ |
222d54dc |
816 | if (cipher) { |
b81cca98 |
817 | error = "wrong passphrase"; |
222d54dc |
818 | ret = SSH2_WRONG_PASSPHRASE; |
819 | } else { |
820 | error = "MAC failed"; |
821 | ret = NULL; |
822 | } |
65a22376 |
823 | goto error; |
824 | } |
825 | } |
5c72ca61 |
826 | sfree(mac); |
65a22376 |
827 | |
828 | /* |
829 | * Create and return the key. |
830 | */ |
3d88e64d |
831 | ret = snew(struct ssh2_userkey); |
65a22376 |
832 | ret->alg = alg; |
833 | ret->comment = comment; |
834 | ret->data = alg->createkey(public_blob, public_blob_len, |
835 | private_blob, private_blob_len); |
98f022f5 |
836 | if (!ret->data) { |
837 | sfree(ret->comment); |
838 | sfree(ret); |
839 | ret = NULL; |
222d54dc |
840 | error = "createkey failed"; |
841 | goto error; |
98f022f5 |
842 | } |
65a22376 |
843 | sfree(public_blob); |
844 | sfree(private_blob); |
7bedb13c |
845 | sfree(encryption); |
2d8cd396 |
846 | if (errorstr) |
847 | *errorstr = NULL; |
65a22376 |
848 | return ret; |
849 | |
850 | /* |
851 | * Error processing. |
852 | */ |
32874aea |
853 | error: |
854 | if (fp) |
855 | fclose(fp); |
856 | if (comment) |
857 | sfree(comment); |
7bedb13c |
858 | if (encryption) |
859 | sfree(encryption); |
5c72ca61 |
860 | if (mac) |
861 | sfree(mac); |
32874aea |
862 | if (public_blob) |
863 | sfree(public_blob); |
864 | if (private_blob) |
865 | sfree(private_blob); |
222d54dc |
866 | if (errorstr) |
867 | *errorstr = error; |
65a22376 |
868 | return ret; |
869 | } |
870 | |
8a9977e5 |
871 | unsigned char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm, |
872 | int *pub_blob_len, char **commentptr, |
873 | const char **errorstr) |
32874aea |
874 | { |
65a22376 |
875 | FILE *fp; |
876 | char header[40], *b; |
877 | const struct ssh_signkey *alg; |
65a22376 |
878 | unsigned char *public_blob; |
879 | int public_blob_len; |
880 | int i; |
222d54dc |
881 | const char *error = NULL; |
06897bd7 |
882 | char *comment; |
65a22376 |
883 | |
884 | public_blob = NULL; |
885 | |
c6940f12 |
886 | fp = f_open(*filename, "rb", FALSE); |
222d54dc |
887 | if (!fp) { |
888 | error = "can't open file"; |
65a22376 |
889 | goto error; |
222d54dc |
890 | } |
65a22376 |
891 | |
892 | /* Read the first header line which contains the key type. */ |
32874aea |
893 | if (!read_header(fp, header) |
7bedb13c |
894 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
222d54dc |
895 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) { |
896 | error = "not a PuTTY SSH-2 private key"; |
65a22376 |
897 | goto error; |
222d54dc |
898 | } |
899 | error = "file format error"; |
65a22376 |
900 | if ((b = read_body(fp)) == NULL) |
901 | goto error; |
fbc7c9b4 |
902 | /* Select key algorithm structure. */ |
47a6b94c |
903 | alg = find_pubkey_alg(b); |
904 | if (!alg) { |
65a22376 |
905 | sfree(b); |
906 | goto error; |
907 | } |
908 | sfree(b); |
32874aea |
909 | |
65a22376 |
910 | /* Read the Encryption header line. */ |
32874aea |
911 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) |
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 Comment header line. */ |
32874aea |
918 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) |
65a22376 |
919 | goto error; |
06897bd7 |
920 | if ((comment = read_body(fp)) == NULL) |
65a22376 |
921 | goto error; |
06897bd7 |
922 | |
923 | if (commentptr) |
924 | *commentptr = comment; |
925 | else |
926 | sfree(comment); |
65a22376 |
927 | |
928 | /* Read the Public-Lines header line and the public blob. */ |
32874aea |
929 | if (!read_header(fp, header) || 0 != strcmp(header, "Public-Lines")) |
65a22376 |
930 | goto error; |
931 | if ((b = read_body(fp)) == NULL) |
932 | goto error; |
933 | i = atoi(b); |
934 | sfree(b); |
935 | if ((public_blob = read_blob(fp, i, &public_blob_len)) == NULL) |
936 | goto error; |
937 | |
938 | fclose(fp); |
3f2d010c |
939 | if (pub_blob_len) |
940 | *pub_blob_len = public_blob_len; |
941 | if (algorithm) |
942 | *algorithm = alg->name; |
8a9977e5 |
943 | return public_blob; |
65a22376 |
944 | |
945 | /* |
946 | * Error processing. |
947 | */ |
32874aea |
948 | error: |
949 | if (fp) |
950 | fclose(fp); |
951 | if (public_blob) |
952 | sfree(public_blob); |
222d54dc |
953 | if (errorstr) |
954 | *errorstr = error; |
65a22376 |
955 | return NULL; |
956 | } |
957 | |
9a30e26b |
958 | int ssh2_userkey_encrypted(const Filename *filename, char **commentptr) |
32874aea |
959 | { |
65a22376 |
960 | FILE *fp; |
961 | char header[40], *b, *comment; |
962 | int ret; |
963 | |
32874aea |
964 | if (commentptr) |
965 | *commentptr = NULL; |
65a22376 |
966 | |
c6940f12 |
967 | fp = f_open(*filename, "rb", FALSE); |
65a22376 |
968 | if (!fp) |
969 | return 0; |
32874aea |
970 | if (!read_header(fp, header) |
7bedb13c |
971 | || (0 != strcmp(header, "PuTTY-User-Key-File-2") && |
972 | 0 != strcmp(header, "PuTTY-User-Key-File-1"))) { |
32874aea |
973 | fclose(fp); |
974 | return 0; |
65a22376 |
975 | } |
976 | if ((b = read_body(fp)) == NULL) { |
32874aea |
977 | fclose(fp); |
978 | return 0; |
65a22376 |
979 | } |
980 | sfree(b); /* we don't care about key type here */ |
981 | /* Read the Encryption header line. */ |
32874aea |
982 | if (!read_header(fp, header) || 0 != strcmp(header, "Encryption")) { |
983 | fclose(fp); |
984 | return 0; |
65a22376 |
985 | } |
986 | if ((b = read_body(fp)) == NULL) { |
32874aea |
987 | fclose(fp); |
988 | return 0; |
65a22376 |
989 | } |
990 | |
991 | /* Read the Comment header line. */ |
32874aea |
992 | if (!read_header(fp, header) || 0 != strcmp(header, "Comment")) { |
993 | fclose(fp); |
994 | sfree(b); |
995 | return 1; |
65a22376 |
996 | } |
997 | if ((comment = read_body(fp)) == NULL) { |
32874aea |
998 | fclose(fp); |
999 | sfree(b); |
1000 | return 1; |
65a22376 |
1001 | } |
1002 | |
32874aea |
1003 | if (commentptr) |
1004 | *commentptr = comment; |
65a22376 |
1005 | |
1006 | fclose(fp); |
1007 | if (!strcmp(b, "aes256-cbc")) |
1008 | ret = 1; |
1009 | else |
1010 | ret = 0; |
1011 | sfree(b); |
1012 | return ret; |
1013 | } |
1014 | |
32874aea |
1015 | int base64_lines(int datalen) |
1016 | { |
65a22376 |
1017 | /* When encoding, we use 64 chars/line, which equals 48 real chars. */ |
32874aea |
1018 | return (datalen + 47) / 48; |
65a22376 |
1019 | } |
1020 | |
96d19bc9 |
1021 | void base64_encode(FILE * fp, unsigned char *data, int datalen, int cpl) |
32874aea |
1022 | { |
65a22376 |
1023 | int linelen = 0; |
1024 | char out[4]; |
96d19bc9 |
1025 | int n, i; |
65a22376 |
1026 | |
1027 | while (datalen > 0) { |
65a22376 |
1028 | n = (datalen < 3 ? datalen : 3); |
1029 | base64_encode_atom(data, n, out); |
1030 | data += n; |
1031 | datalen -= n; |
96d19bc9 |
1032 | for (i = 0; i < 4; i++) { |
1033 | if (linelen >= cpl) { |
1034 | linelen = 0; |
1035 | fputc('\n', fp); |
1036 | } |
1037 | fputc(out[i], fp); |
1038 | linelen++; |
1039 | } |
65a22376 |
1040 | } |
1041 | fputc('\n', fp); |
1042 | } |
1043 | |
9a30e26b |
1044 | int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key, |
32874aea |
1045 | char *passphrase) |
1046 | { |
65a22376 |
1047 | FILE *fp; |
1048 | unsigned char *pub_blob, *priv_blob, *priv_blob_encrypted; |
1049 | int pub_blob_len, priv_blob_len, priv_encrypted_len; |
1050 | int passlen; |
1051 | int cipherblk; |
7bedb13c |
1052 | int i; |
65a22376 |
1053 | char *cipherstr; |
5c72ca61 |
1054 | unsigned char priv_mac[20]; |
65a22376 |
1055 | |
1056 | /* |
1057 | * Fetch the key component blobs. |
1058 | */ |
1059 | pub_blob = key->alg->public_blob(key->data, &pub_blob_len); |
1060 | priv_blob = key->alg->private_blob(key->data, &priv_blob_len); |
1061 | if (!pub_blob || !priv_blob) { |
1062 | sfree(pub_blob); |
1063 | sfree(priv_blob); |
1064 | return 0; |
1065 | } |
1066 | |
1067 | /* |
1068 | * Determine encryption details, and encrypt the private blob. |
1069 | */ |
1070 | if (passphrase) { |
1071 | cipherstr = "aes256-cbc"; |
1072 | cipherblk = 16; |
1073 | } else { |
1074 | cipherstr = "none"; |
1075 | cipherblk = 1; |
1076 | } |
1077 | priv_encrypted_len = priv_blob_len + cipherblk - 1; |
1078 | priv_encrypted_len -= priv_encrypted_len % cipherblk; |
3d88e64d |
1079 | priv_blob_encrypted = snewn(priv_encrypted_len, unsigned char); |
65a22376 |
1080 | memset(priv_blob_encrypted, 0, priv_encrypted_len); |
1081 | memcpy(priv_blob_encrypted, priv_blob, priv_blob_len); |
1082 | /* Create padding based on the SHA hash of the unpadded blob. This prevents |
1083 | * too easy a known-plaintext attack on the last block. */ |
5c72ca61 |
1084 | SHA_Simple(priv_blob, priv_blob_len, priv_mac); |
65a22376 |
1085 | assert(priv_encrypted_len - priv_blob_len < 20); |
5c72ca61 |
1086 | memcpy(priv_blob_encrypted + priv_blob_len, priv_mac, |
65a22376 |
1087 | priv_encrypted_len - priv_blob_len); |
1088 | |
7bedb13c |
1089 | /* Now create the MAC. */ |
1090 | { |
1091 | unsigned char *macdata; |
1092 | int maclen; |
1093 | unsigned char *p; |
1094 | int namelen = strlen(key->alg->name); |
1095 | int enclen = strlen(cipherstr); |
1096 | int commlen = strlen(key->comment); |
5c72ca61 |
1097 | SHA_State s; |
1098 | unsigned char mackey[20]; |
1099 | char header[] = "putty-private-key-file-mac-key"; |
1100 | |
7bedb13c |
1101 | maclen = (4 + namelen + |
1102 | 4 + enclen + |
1103 | 4 + commlen + |
1104 | 4 + pub_blob_len + |
1105 | 4 + priv_encrypted_len); |
3d88e64d |
1106 | macdata = snewn(maclen, unsigned char); |
7bedb13c |
1107 | p = macdata; |
1108 | #define DO_STR(s,len) PUT_32BIT(p,(len));memcpy(p+4,(s),(len));p+=4+(len) |
1109 | DO_STR(key->alg->name, namelen); |
1110 | DO_STR(cipherstr, enclen); |
1111 | DO_STR(key->comment, commlen); |
1112 | DO_STR(pub_blob, pub_blob_len); |
1113 | DO_STR(priv_blob_encrypted, priv_encrypted_len); |
5c72ca61 |
1114 | |
1115 | SHA_Init(&s); |
1116 | SHA_Bytes(&s, header, sizeof(header)-1); |
7bedb13c |
1117 | if (passphrase) |
1118 | SHA_Bytes(&s, passphrase, strlen(passphrase)); |
5c72ca61 |
1119 | SHA_Final(&s, mackey); |
7bedb13c |
1120 | hmac_sha1_simple(mackey, 20, macdata, maclen, priv_mac); |
1121 | memset(macdata, 0, maclen); |
1122 | sfree(macdata); |
5c72ca61 |
1123 | memset(mackey, 0, sizeof(mackey)); |
1124 | memset(&s, 0, sizeof(s)); |
5c72ca61 |
1125 | } |
65a22376 |
1126 | |
1127 | if (passphrase) { |
2247e107 |
1128 | unsigned char key[40]; |
65a22376 |
1129 | SHA_State s; |
1130 | |
1131 | passlen = strlen(passphrase); |
1132 | |
1133 | SHA_Init(&s); |
1134 | SHA_Bytes(&s, "\0\0\0\0", 4); |
1135 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1136 | SHA_Final(&s, key + 0); |
65a22376 |
1137 | SHA_Init(&s); |
1138 | SHA_Bytes(&s, "\0\0\0\1", 4); |
1139 | SHA_Bytes(&s, passphrase, passlen); |
32874aea |
1140 | SHA_Final(&s, key + 20); |
1141 | aes256_encrypt_pubkey(key, priv_blob_encrypted, |
1142 | priv_encrypted_len); |
5c72ca61 |
1143 | |
1144 | memset(key, 0, sizeof(key)); |
1145 | memset(&s, 0, sizeof(s)); |
65a22376 |
1146 | } |
1147 | |
c6940f12 |
1148 | fp = f_open(*filename, "w", TRUE); |
65a22376 |
1149 | if (!fp) |
1150 | return 0; |
7bedb13c |
1151 | fprintf(fp, "PuTTY-User-Key-File-2: %s\n", key->alg->name); |
65a22376 |
1152 | fprintf(fp, "Encryption: %s\n", cipherstr); |
1153 | fprintf(fp, "Comment: %s\n", key->comment); |
1154 | fprintf(fp, "Public-Lines: %d\n", base64_lines(pub_blob_len)); |
96d19bc9 |
1155 | base64_encode(fp, pub_blob, pub_blob_len, 64); |
65a22376 |
1156 | fprintf(fp, "Private-Lines: %d\n", base64_lines(priv_encrypted_len)); |
96d19bc9 |
1157 | base64_encode(fp, priv_blob_encrypted, priv_encrypted_len, 64); |
7bedb13c |
1158 | fprintf(fp, "Private-MAC: "); |
65a22376 |
1159 | for (i = 0; i < 20; i++) |
5c72ca61 |
1160 | fprintf(fp, "%02x", priv_mac[i]); |
65a22376 |
1161 | fprintf(fp, "\n"); |
1162 | fclose(fp); |
7bedb13c |
1163 | |
1164 | sfree(pub_blob); |
1165 | memset(priv_blob, 0, priv_blob_len); |
1166 | sfree(priv_blob); |
1167 | sfree(priv_blob_encrypted); |
65a22376 |
1168 | return 1; |
1169 | } |
1170 | |
1171 | /* ---------------------------------------------------------------------- |
231ee168 |
1172 | * A function to determine the type of a private key file. Returns |
1173 | * 0 on failure, 1 or 2 on success. |
65a22376 |
1174 | */ |
9a30e26b |
1175 | int key_type(const Filename *filename) |
32874aea |
1176 | { |
65a22376 |
1177 | FILE *fp; |
231ee168 |
1178 | char buf[32]; |
1179 | const char putty2_sig[] = "PuTTY-User-Key-File-"; |
1180 | const char sshcom_sig[] = "---- BEGIN SSH2 ENCRYPTED PRIVAT"; |
1181 | const char openssh_sig[] = "-----BEGIN "; |
65a22376 |
1182 | int i; |
1183 | |
c6940f12 |
1184 | fp = f_open(*filename, "r", FALSE); |
65a22376 |
1185 | if (!fp) |
231ee168 |
1186 | return SSH_KEYTYPE_UNOPENABLE; |
1187 | i = fread(buf, 1, sizeof(buf), fp); |
65a22376 |
1188 | fclose(fp); |
231ee168 |
1189 | if (i < 0) |
1190 | return SSH_KEYTYPE_UNOPENABLE; |
1191 | if (i < 32) |
1192 | return SSH_KEYTYPE_UNKNOWN; |
1193 | if (!memcmp(buf, rsa_signature, sizeof(rsa_signature)-1)) |
1194 | return SSH_KEYTYPE_SSH1; |
1195 | if (!memcmp(buf, putty2_sig, sizeof(putty2_sig)-1)) |
1196 | return SSH_KEYTYPE_SSH2; |
1197 | if (!memcmp(buf, openssh_sig, sizeof(openssh_sig)-1)) |
1198 | return SSH_KEYTYPE_OPENSSH; |
1199 | if (!memcmp(buf, sshcom_sig, sizeof(sshcom_sig)-1)) |
1200 | return SSH_KEYTYPE_SSHCOM; |
1201 | return SSH_KEYTYPE_UNKNOWN; /* unrecognised or EOF */ |
1202 | } |
1203 | |
1204 | /* |
1205 | * Convert the type word to a string, for `wrong type' error |
1206 | * messages. |
1207 | */ |
1208 | char *key_type_to_str(int type) |
1209 | { |
1210 | switch (type) { |
1211 | case SSH_KEYTYPE_UNOPENABLE: return "unable to open file"; break; |
1212 | case SSH_KEYTYPE_UNKNOWN: return "not a private key"; break; |
2e85c969 |
1213 | case SSH_KEYTYPE_SSH1: return "SSH-1 private key"; break; |
1214 | case SSH_KEYTYPE_SSH2: return "PuTTY SSH-2 private key"; break; |
1215 | case SSH_KEYTYPE_OPENSSH: return "OpenSSH SSH-2 private key"; break; |
1216 | case SSH_KEYTYPE_SSHCOM: return "ssh.com SSH-2 private key"; break; |
231ee168 |
1217 | default: return "INTERNAL ERROR"; break; |
1218 | } |
65a22376 |
1219 | } |