diff options
-rw-r--r-- | dsa.c | 310 | ||||
-rw-r--r-- | hmac.c | 64 | ||||
-rw-r--r-- | kex.c | 430 |
3 files changed, 0 insertions, 804 deletions
diff --git a/dsa.c b/dsa.c deleted file mode 100644 index 778d43d59..000000000 --- a/dsa.c +++ /dev/null | |||
@@ -1,310 +0,0 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | ||
3 | * | ||
4 | * Redistribution and use in source and binary forms, with or without | ||
5 | * modification, are permitted provided that the following conditions | ||
6 | * are met: | ||
7 | * 1. Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * 2. Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * 3. All advertising materials mentioning features or use of this software | ||
13 | * must display the following acknowledgement: | ||
14 | * This product includes software developed by Markus Friedl. | ||
15 | * 4. The name of the author may not be used to endorse or promote products | ||
16 | * derived from this software without specific prior written permission. | ||
17 | * | ||
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
28 | */ | ||
29 | |||
30 | #include "includes.h" | ||
31 | RCSID("$Id: dsa.c,v 1.4 2000/04/14 10:30:31 markus Exp $"); | ||
32 | |||
33 | #include "ssh.h" | ||
34 | #include "xmalloc.h" | ||
35 | #include "buffer.h" | ||
36 | #include "bufaux.h" | ||
37 | #include "compat.h" | ||
38 | |||
39 | #if HAVE_OPENSSL | ||
40 | # include <openssl/bn.h> | ||
41 | # include <openssl/dh.h> | ||
42 | # include <openssl/rsa.h> | ||
43 | # include <openssl/dsa.h> | ||
44 | # include <openssl/evp.h> | ||
45 | # include <openssl/bio.h> | ||
46 | # include <openssl/pem.h> | ||
47 | # include <openssl/hmac.h> | ||
48 | #endif /* HAVE_OPENSSL */ | ||
49 | #if HAVE_SSL | ||
50 | # include <ssl/bn.h> | ||
51 | # include <ssl/dh.h> | ||
52 | # include <ssl/rsa.h> | ||
53 | # include <ssl/dsa.h> | ||
54 | # include <ssl/evp.h> | ||
55 | # include <ssl/bio.h> | ||
56 | # include <ssl/pem.h> | ||
57 | # include <ssl/hmac.h> | ||
58 | #endif /* HAVE_SSL */ | ||
59 | |||
60 | #include "kex.h" | ||
61 | #include "key.h" | ||
62 | |||
63 | #define INTBLOB_LEN 20 | ||
64 | #define SIGBLOB_LEN (2*INTBLOB_LEN) | ||
65 | |||
66 | Key * | ||
67 | dsa_serverkey_from_blob( | ||
68 | char *serverhostkey, int serverhostkeylen) | ||
69 | { | ||
70 | Buffer b; | ||
71 | char *ktype; | ||
72 | int rlen; | ||
73 | DSA *dsa; | ||
74 | Key *key; | ||
75 | |||
76 | /* fetch & parse DSA/DSS pubkey */ | ||
77 | key = key_new(KEY_DSA); | ||
78 | dsa = key->dsa; | ||
79 | buffer_init(&b); | ||
80 | buffer_append(&b, serverhostkey, serverhostkeylen); | ||
81 | ktype = buffer_get_string(&b, NULL); | ||
82 | if (strcmp(KEX_DSS, ktype) != 0) { | ||
83 | error("dsa_serverkey_from_blob: cannot handle type %s", ktype); | ||
84 | key_free(key); | ||
85 | return NULL; | ||
86 | } | ||
87 | buffer_get_bignum2(&b, dsa->p); | ||
88 | buffer_get_bignum2(&b, dsa->q); | ||
89 | buffer_get_bignum2(&b, dsa->g); | ||
90 | buffer_get_bignum2(&b, dsa->pub_key); | ||
91 | rlen = buffer_len(&b); | ||
92 | if(rlen != 0) | ||
93 | error("dsa_serverkey_from_blob: remaining bytes in serverhostkey %d", rlen); | ||
94 | buffer_free(&b); | ||
95 | |||
96 | debug("keytype %s", ktype); | ||
97 | #ifdef DEBUG_DSS | ||
98 | DSA_print_fp(stderr, dsa, 8); | ||
99 | #endif | ||
100 | return key; | ||
101 | } | ||
102 | DSA * | ||
103 | dsa_load_private(char *filename) | ||
104 | { | ||
105 | DSA *dsa; | ||
106 | BIO *in; | ||
107 | |||
108 | in = BIO_new(BIO_s_file()); | ||
109 | if (in == NULL) | ||
110 | fatal("BIO_new failed"); | ||
111 | if (BIO_read_filename(in, filename) <= 0) | ||
112 | fatal("BIO_read failed %s: %s", filename, strerror(errno)); | ||
113 | fprintf(stderr, "read DSA private key\n"); | ||
114 | dsa = PEM_read_bio_DSAPrivateKey(in,NULL,NULL,NULL); | ||
115 | if (dsa == NULL) | ||
116 | fatal("PEM_read_bio_DSAPrivateKey failed %s", filename); | ||
117 | BIO_free(in); | ||
118 | return dsa; | ||
119 | } | ||
120 | Key * | ||
121 | dsa_get_serverkey(char *filename) | ||
122 | { | ||
123 | Key *k = key_new(KEY_EMPTY); | ||
124 | k->type = KEY_DSA; | ||
125 | k->dsa = dsa_load_private(filename); | ||
126 | #ifdef DEBUG_DSS | ||
127 | DSA_print_fp(stderr, dsa, 8); | ||
128 | #endif | ||
129 | return k; | ||
130 | } | ||
131 | int | ||
132 | dsa_make_serverkey_blob(Key *key, unsigned char **blobp, unsigned int *lenp) | ||
133 | { | ||
134 | Buffer b; | ||
135 | int len; | ||
136 | unsigned char *buf; | ||
137 | |||
138 | if (key == NULL || key->type != KEY_DSA) | ||
139 | return 0; | ||
140 | buffer_init(&b); | ||
141 | buffer_put_cstring(&b, KEX_DSS); | ||
142 | buffer_put_bignum2(&b, key->dsa->p); | ||
143 | buffer_put_bignum2(&b, key->dsa->q); | ||
144 | buffer_put_bignum2(&b, key->dsa->g); | ||
145 | buffer_put_bignum2(&b, key->dsa->pub_key); | ||
146 | len = buffer_len(&b); | ||
147 | buf = xmalloc(len); | ||
148 | memcpy(buf, buffer_ptr(&b), len); | ||
149 | memset(buffer_ptr(&b), 0, len); | ||
150 | buffer_free(&b); | ||
151 | if (lenp != NULL) | ||
152 | *lenp = len; | ||
153 | if (blobp != NULL) | ||
154 | *blobp = buf; | ||
155 | return len; | ||
156 | } | ||
157 | int | ||
158 | dsa_sign( | ||
159 | Key *key, | ||
160 | unsigned char **sigp, int *lenp, | ||
161 | unsigned char *hash, int hlen) | ||
162 | { | ||
163 | unsigned char *digest; | ||
164 | unsigned char *ret; | ||
165 | DSA_SIG *sig; | ||
166 | EVP_MD *evp_md = EVP_sha1(); | ||
167 | EVP_MD_CTX md; | ||
168 | unsigned int rlen; | ||
169 | unsigned int slen; | ||
170 | unsigned int len; | ||
171 | unsigned char sigblob[SIGBLOB_LEN]; | ||
172 | Buffer b; | ||
173 | |||
174 | if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) { | ||
175 | error("dsa_sign: no DSA key"); | ||
176 | return -1; | ||
177 | } | ||
178 | digest = xmalloc(evp_md->md_size); | ||
179 | EVP_DigestInit(&md, evp_md); | ||
180 | EVP_DigestUpdate(&md, hash, hlen); | ||
181 | EVP_DigestFinal(&md, digest, NULL); | ||
182 | |||
183 | sig = DSA_do_sign(digest, evp_md->md_size, key->dsa); | ||
184 | |||
185 | rlen = BN_num_bytes(sig->r); | ||
186 | slen = BN_num_bytes(sig->s); | ||
187 | if (rlen > INTBLOB_LEN || slen > INTBLOB_LEN) { | ||
188 | error("bad sig size %d %d", rlen, slen); | ||
189 | DSA_SIG_free(sig); | ||
190 | return -1; | ||
191 | } | ||
192 | debug("sig size %d %d", rlen, slen); | ||
193 | |||
194 | memset(sigblob, 0, SIGBLOB_LEN); | ||
195 | BN_bn2bin(sig->r, sigblob+ SIGBLOB_LEN - INTBLOB_LEN - rlen); | ||
196 | BN_bn2bin(sig->s, sigblob+ SIGBLOB_LEN - slen); | ||
197 | DSA_SIG_free(sig); | ||
198 | |||
199 | if (datafellows) { | ||
200 | debug("datafellows"); | ||
201 | ret = xmalloc(SIGBLOB_LEN); | ||
202 | memcpy(ret, sigblob, SIGBLOB_LEN); | ||
203 | if (lenp != NULL) | ||
204 | *lenp = SIGBLOB_LEN; | ||
205 | if (sigp != NULL) | ||
206 | *sigp = ret; | ||
207 | } else { | ||
208 | /* ietf-drafts */ | ||
209 | buffer_init(&b); | ||
210 | buffer_put_cstring(&b, KEX_DSS); | ||
211 | buffer_put_string(&b, sigblob, SIGBLOB_LEN); | ||
212 | len = buffer_len(&b); | ||
213 | ret = xmalloc(len); | ||
214 | memcpy(ret, buffer_ptr(&b), len); | ||
215 | buffer_free(&b); | ||
216 | if (lenp != NULL) | ||
217 | *lenp = len; | ||
218 | if (sigp != NULL) | ||
219 | *sigp = ret; | ||
220 | } | ||
221 | return 0; | ||
222 | } | ||
223 | int | ||
224 | dsa_verify( | ||
225 | Key *key, | ||
226 | unsigned char *signature, int signaturelen, | ||
227 | unsigned char *hash, int hlen) | ||
228 | { | ||
229 | Buffer b; | ||
230 | unsigned char *digest; | ||
231 | DSA_SIG *sig; | ||
232 | EVP_MD *evp_md = EVP_sha1(); | ||
233 | EVP_MD_CTX md; | ||
234 | char *ktype; | ||
235 | unsigned char *sigblob; | ||
236 | char *txt; | ||
237 | unsigned int len; | ||
238 | int rlen; | ||
239 | int ret; | ||
240 | |||
241 | if (key == NULL || key->type != KEY_DSA || key->dsa == NULL) { | ||
242 | error("dsa_verify: no DSA key"); | ||
243 | return -1; | ||
244 | } | ||
245 | |||
246 | if (datafellows && signaturelen != SIGBLOB_LEN) { | ||
247 | log("heh? datafellows ssh2 complies with ietf-drafts????"); | ||
248 | datafellows = 0; | ||
249 | } | ||
250 | |||
251 | debug("len %d datafellows %d", signaturelen, datafellows); | ||
252 | |||
253 | /* fetch signature */ | ||
254 | if (datafellows) { | ||
255 | sigblob = signature; | ||
256 | len = signaturelen; | ||
257 | } else { | ||
258 | /* ietf-drafts */ | ||
259 | buffer_init(&b); | ||
260 | buffer_append(&b, (char *) signature, signaturelen); | ||
261 | ktype = buffer_get_string(&b, NULL); | ||
262 | sigblob = (unsigned char *)buffer_get_string(&b, &len); | ||
263 | rlen = buffer_len(&b); | ||
264 | if(rlen != 0) | ||
265 | error("remaining bytes in signature %d", rlen); | ||
266 | buffer_free(&b); | ||
267 | } | ||
268 | |||
269 | if (len != SIGBLOB_LEN) { | ||
270 | fatal("bad sigbloblen %d != SIGBLOB_LEN", len); | ||
271 | } | ||
272 | |||
273 | /* parse signature */ | ||
274 | sig = DSA_SIG_new(); | ||
275 | sig->r = BN_new(); | ||
276 | sig->s = BN_new(); | ||
277 | BN_bin2bn(sigblob, INTBLOB_LEN, sig->r); | ||
278 | BN_bin2bn(sigblob+ INTBLOB_LEN, INTBLOB_LEN, sig->s); | ||
279 | if (!datafellows) { | ||
280 | memset(sigblob, 0, len); | ||
281 | xfree(sigblob); | ||
282 | } | ||
283 | |||
284 | /* sha1 the signed data (== session_id == hash) */ | ||
285 | digest = xmalloc(evp_md->md_size); | ||
286 | EVP_DigestInit(&md, evp_md); | ||
287 | EVP_DigestUpdate(&md, hash, hlen); | ||
288 | EVP_DigestFinal(&md, digest, NULL); | ||
289 | |||
290 | ret = DSA_do_verify(digest, evp_md->md_size, sig, key->dsa); | ||
291 | |||
292 | memset(digest, 0, evp_md->md_size); | ||
293 | xfree(digest); | ||
294 | DSA_SIG_free(sig); | ||
295 | |||
296 | switch (ret) { | ||
297 | case 1: | ||
298 | txt = "correct"; | ||
299 | break; | ||
300 | case 0: | ||
301 | txt = "incorrect"; | ||
302 | break; | ||
303 | case -1: | ||
304 | default: | ||
305 | txt = "error"; | ||
306 | break; | ||
307 | } | ||
308 | debug("dsa_verify: signature %s", txt); | ||
309 | return ret; | ||
310 | } | ||
diff --git a/hmac.c b/hmac.c deleted file mode 100644 index eea1a2600..000000000 --- a/hmac.c +++ /dev/null | |||
@@ -1,64 +0,0 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | ||
3 | * | ||
4 | * Redistribution and use in source and binary forms, with or without | ||
5 | * modification, are permitted provided that the following conditions | ||
6 | * are met: | ||
7 | * 1. Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * 2. Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * 3. All advertising materials mentioning features or use of this software | ||
13 | * must display the following acknowledgement: | ||
14 | * This product includes software developed by Markus Friedl. | ||
15 | * 4. The name of the author may not be used to endorse or promote products | ||
16 | * derived from this software without specific prior written permission. | ||
17 | * | ||
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
28 | */ | ||
29 | |||
30 | #include "includes.h" | ||
31 | RCSID("$Id: hmac.c,v 1.2 2000/04/12 09:39:10 markus Exp $"); | ||
32 | |||
33 | #include "xmalloc.h" | ||
34 | #include "ssh.h" | ||
35 | #include "getput.h" | ||
36 | |||
37 | #if HAVE_OPENSSL | ||
38 | # include <openssl/hmac.h> | ||
39 | #endif /* HAVE_OPENSSL */ | ||
40 | #if HAVE_SSL | ||
41 | # include <ssl/hmac.h> | ||
42 | #endif /* HAVE_SSL */ | ||
43 | |||
44 | unsigned char * | ||
45 | hmac( | ||
46 | EVP_MD *evp_md, | ||
47 | unsigned int seqno, | ||
48 | unsigned char *data, int datalen, | ||
49 | unsigned char *key, int keylen) | ||
50 | { | ||
51 | HMAC_CTX c; | ||
52 | static unsigned char m[EVP_MAX_MD_SIZE]; | ||
53 | unsigned char b[4]; | ||
54 | |||
55 | if (key == NULL) | ||
56 | fatal("hmac: no key"); | ||
57 | HMAC_Init(&c, key, keylen, evp_md); | ||
58 | PUT_32BIT(b, seqno); | ||
59 | HMAC_Update(&c, b, sizeof b); | ||
60 | HMAC_Update(&c, data, datalen); | ||
61 | HMAC_Final(&c, m, NULL); | ||
62 | HMAC_cleanup(&c); | ||
63 | return(m); | ||
64 | } | ||
diff --git a/kex.c b/kex.c deleted file mode 100644 index 4b5266937..000000000 --- a/kex.c +++ /dev/null | |||
@@ -1,430 +0,0 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | ||
3 | * | ||
4 | * Redistribution and use in source and binary forms, with or without | ||
5 | * modification, are permitted provided that the following conditions | ||
6 | * are met: | ||
7 | * 1. Redistributions of source code must retain the above copyright | ||
8 | * notice, this list of conditions and the following disclaimer. | ||
9 | * 2. Redistributions in binary form must reproduce the above copyright | ||
10 | * notice, this list of conditions and the following disclaimer in the | ||
11 | * documentation and/or other materials provided with the distribution. | ||
12 | * 3. All advertising materials mentioning features or use of this software | ||
13 | * must display the following acknowledgement: | ||
14 | * This product includes software developed by Markus Friedl. | ||
15 | * 4. The name of the author may not be used to endorse or promote products | ||
16 | * derived from this software without specific prior written permission. | ||
17 | * | ||
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
28 | */ | ||
29 | |||
30 | #include "includes.h" | ||
31 | RCSID("$Id: kex.c,v 1.5 2000/04/16 01:18:43 damien Exp $"); | ||
32 | |||
33 | #include "ssh.h" | ||
34 | #include "ssh2.h" | ||
35 | #include "xmalloc.h" | ||
36 | #include "buffer.h" | ||
37 | #include "bufaux.h" | ||
38 | #include "cipher.h" | ||
39 | #include "compat.h" | ||
40 | |||
41 | #if HAVE_OPENSSL | ||
42 | # include <openssl/bn.h> | ||
43 | # include <openssl/dh.h> | ||
44 | # include <openssl/crypto.h> | ||
45 | # include <openssl/bio.h> | ||
46 | # include <openssl/pem.h> | ||
47 | #endif /* HAVE_OPENSSL */ | ||
48 | #if HAVE_SSL | ||
49 | # include <ssl/bn.h> | ||
50 | # include <ssl/dh.h> | ||
51 | # include <ssl/crypto.h> | ||
52 | # include <ssl/bio.h> | ||
53 | # include <ssl/pem.h> | ||
54 | #endif /* HAVE_SSL */ | ||
55 | |||
56 | #include "kex.h" | ||
57 | |||
58 | Buffer * | ||
59 | kex_init(char *myproposal[PROPOSAL_MAX]) | ||
60 | { | ||
61 | char c = 0; | ||
62 | unsigned char cookie[16]; | ||
63 | u_int32_t rand = 0; | ||
64 | int i; | ||
65 | Buffer *ki = xmalloc(sizeof(*ki)); | ||
66 | for (i = 0; i < 16; i++) { | ||
67 | if (i % 4 == 0) | ||
68 | rand = arc4random(); | ||
69 | cookie[i] = rand & 0xff; | ||
70 | rand >>= 8; | ||
71 | } | ||
72 | buffer_init(ki); | ||
73 | buffer_append(ki, (char *)cookie, sizeof cookie); | ||
74 | for (i = 0; i < PROPOSAL_MAX; i++) | ||
75 | buffer_put_cstring(ki, myproposal[i]); | ||
76 | buffer_append(ki, &c, 1); /* boolean first_kex_packet_follows */ | ||
77 | buffer_put_int(ki, 0); /* uint32 0 (reserved for future extension) */ | ||
78 | return ki; | ||
79 | } | ||
80 | |||
81 | /* diffie-hellman-group1-sha1 */ | ||
82 | |||
83 | int | ||
84 | dh_pub_is_valid(DH *dh, BIGNUM *dh_pub) | ||
85 | { | ||
86 | int i; | ||
87 | int n = BN_num_bits(dh_pub); | ||
88 | int bits_set = 0; | ||
89 | |||
90 | /* we only accept g==2 */ | ||
91 | if (!BN_is_word(dh->g, 2)) { | ||
92 | log("invalid DH base != 2"); | ||
93 | return 0; | ||
94 | } | ||
95 | if (dh_pub->neg) { | ||
96 | log("invalid public DH value: negativ"); | ||
97 | return 0; | ||
98 | } | ||
99 | for (i = 0; i <= n; i++) | ||
100 | if (BN_is_bit_set(dh_pub, i)) | ||
101 | bits_set++; | ||
102 | debug("bits set: %d/%d", bits_set, BN_num_bits(dh->p)); | ||
103 | |||
104 | /* if g==2 and bits_set==1 then computing log_g(dh_pub) is trivial */ | ||
105 | if (bits_set > 1 && (BN_cmp(dh_pub, dh->p) == -1)) | ||
106 | return 1; | ||
107 | log("invalid public DH value (%d/%d)", bits_set, BN_num_bits(dh->p)); | ||
108 | return 0; | ||
109 | } | ||
110 | |||
111 | DH * | ||
112 | dh_new_group1() | ||
113 | { | ||
114 | static char *group1 = | ||
115 | "FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1" | ||
116 | "29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD" | ||
117 | "EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245" | ||
118 | "E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED" | ||
119 | "EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381" | ||
120 | "FFFFFFFF" "FFFFFFFF"; | ||
121 | DH *dh; | ||
122 | int ret, tries = 0; | ||
123 | dh = DH_new(); | ||
124 | if(dh == NULL) | ||
125 | fatal("DH_new"); | ||
126 | ret = BN_hex2bn(&dh->p, group1); | ||
127 | if(ret<0) | ||
128 | fatal("BN_hex2bn"); | ||
129 | dh->g = BN_new(); | ||
130 | if(dh->g == NULL) | ||
131 | fatal("DH_new g"); | ||
132 | BN_set_word(dh->g, 2); | ||
133 | do { | ||
134 | if (DH_generate_key(dh) == 0) | ||
135 | fatal("DH_generate_key"); | ||
136 | if (tries++ > 10) | ||
137 | fatal("dh_new_group1: too many bad keys: giving up"); | ||
138 | } while (!dh_pub_is_valid(dh, dh->pub_key)); | ||
139 | return dh; | ||
140 | } | ||
141 | |||
142 | void | ||
143 | bignum_print(BIGNUM *b) | ||
144 | { | ||
145 | BN_print_fp(stderr,b); | ||
146 | } | ||
147 | |||
148 | void | ||
149 | dump_digest(unsigned char *digest, int len) | ||
150 | { | ||
151 | int i; | ||
152 | for (i = 0; i< len; i++){ | ||
153 | fprintf(stderr, "%02x", digest[i]); | ||
154 | if(i%2!=0) | ||
155 | fprintf(stderr, " "); | ||
156 | } | ||
157 | fprintf(stderr, "\n"); | ||
158 | } | ||
159 | |||
160 | unsigned char * | ||
161 | kex_hash( | ||
162 | char *client_version_string, | ||
163 | char *server_version_string, | ||
164 | char *ckexinit, int ckexinitlen, | ||
165 | char *skexinit, int skexinitlen, | ||
166 | char *serverhostkeyblob, int sbloblen, | ||
167 | BIGNUM *client_dh_pub, | ||
168 | BIGNUM *server_dh_pub, | ||
169 | BIGNUM *shared_secret) | ||
170 | { | ||
171 | Buffer b; | ||
172 | static unsigned char digest[EVP_MAX_MD_SIZE]; | ||
173 | EVP_MD *evp_md = EVP_sha1(); | ||
174 | EVP_MD_CTX md; | ||
175 | |||
176 | buffer_init(&b); | ||
177 | buffer_put_string(&b, client_version_string, strlen(client_version_string)); | ||
178 | buffer_put_string(&b, server_version_string, strlen(server_version_string)); | ||
179 | |||
180 | /* kexinit messages: fake header: len+SSH2_MSG_KEXINIT */ | ||
181 | buffer_put_int(&b, ckexinitlen+1); | ||
182 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | ||
183 | buffer_append(&b, ckexinit, ckexinitlen); | ||
184 | buffer_put_int(&b, skexinitlen+1); | ||
185 | buffer_put_char(&b, SSH2_MSG_KEXINIT); | ||
186 | buffer_append(&b, skexinit, skexinitlen); | ||
187 | |||
188 | buffer_put_string(&b, serverhostkeyblob, sbloblen); | ||
189 | buffer_put_bignum2(&b, client_dh_pub); | ||
190 | buffer_put_bignum2(&b, server_dh_pub); | ||
191 | buffer_put_bignum2(&b, shared_secret); | ||
192 | |||
193 | #ifdef DEBUG_KEX | ||
194 | buffer_dump(&b); | ||
195 | #endif | ||
196 | |||
197 | EVP_DigestInit(&md, evp_md); | ||
198 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); | ||
199 | EVP_DigestFinal(&md, digest, NULL); | ||
200 | |||
201 | buffer_free(&b); | ||
202 | |||
203 | #ifdef DEBUG_KEX | ||
204 | dump_digest(digest, evp_md->md_size); | ||
205 | #endif | ||
206 | return digest; | ||
207 | } | ||
208 | |||
209 | unsigned char * | ||
210 | derive_key(int id, int need, char unsigned *hash, BIGNUM *shared_secret) | ||
211 | { | ||
212 | Buffer b; | ||
213 | EVP_MD *evp_md = EVP_sha1(); | ||
214 | EVP_MD_CTX md; | ||
215 | char c = id; | ||
216 | int have; | ||
217 | int mdsz = evp_md->md_size; | ||
218 | unsigned char *digest = xmalloc(((need+mdsz-1)/mdsz)*mdsz); | ||
219 | |||
220 | buffer_init(&b); | ||
221 | buffer_put_bignum2(&b, shared_secret); | ||
222 | |||
223 | EVP_DigestInit(&md, evp_md); | ||
224 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); /* shared_secret K */ | ||
225 | EVP_DigestUpdate(&md, hash, mdsz); /* transport-06 */ | ||
226 | EVP_DigestUpdate(&md, &c, 1); /* key id */ | ||
227 | EVP_DigestUpdate(&md, hash, mdsz); /* session id */ | ||
228 | EVP_DigestFinal(&md, digest, NULL); | ||
229 | |||
230 | /* expand */ | ||
231 | for (have = mdsz; need > have; have += mdsz) { | ||
232 | EVP_DigestInit(&md, evp_md); | ||
233 | EVP_DigestUpdate(&md, buffer_ptr(&b), buffer_len(&b)); | ||
234 | EVP_DigestUpdate(&md, hash, mdsz); | ||
235 | EVP_DigestUpdate(&md, digest, have); | ||
236 | EVP_DigestFinal(&md, digest + have, NULL); | ||
237 | } | ||
238 | buffer_free(&b); | ||
239 | #ifdef DEBUG_KEX | ||
240 | fprintf(stderr, "Digest '%c'== ", c); | ||
241 | dump_digest(digest, need); | ||
242 | #endif | ||
243 | return digest; | ||
244 | } | ||
245 | |||
246 | #define NKEYS 6 | ||
247 | |||
248 | #define MAX_PROP 20 | ||
249 | #define SEP "," | ||
250 | |||
251 | char * | ||
252 | get_match(char *client, char *server) | ||
253 | { | ||
254 | char *sproposals[MAX_PROP]; | ||
255 | char *p; | ||
256 | int i, j, nproposals; | ||
257 | |||
258 | for ((p = strtok(server, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) { | ||
259 | if (i < MAX_PROP) | ||
260 | sproposals[i] = p; | ||
261 | else | ||
262 | break; | ||
263 | } | ||
264 | nproposals = i; | ||
265 | |||
266 | for ((p = strtok(client, SEP)), i=0; p; (p = strtok(NULL, SEP)), i++) { | ||
267 | for (j = 0; j < nproposals; j++) | ||
268 | if (strcmp(p, sproposals[j]) == 0) | ||
269 | return xstrdup(p); | ||
270 | } | ||
271 | return NULL; | ||
272 | } | ||
273 | void | ||
274 | choose_enc(Enc *enc, char *client, char *server) | ||
275 | { | ||
276 | char *name = get_match(client, server); | ||
277 | if (name == NULL) | ||
278 | fatal("no matching cipher found: client %s server %s", client, server); | ||
279 | enc->type = cipher_number(name); | ||
280 | |||
281 | switch (enc->type) { | ||
282 | case SSH_CIPHER_3DES_CBC: | ||
283 | enc->key_len = 24; | ||
284 | enc->iv_len = 8; | ||
285 | enc->block_size = 8; | ||
286 | break; | ||
287 | case SSH_CIPHER_BLOWFISH_CBC: | ||
288 | case SSH_CIPHER_CAST128_CBC: | ||
289 | enc->key_len = 16; | ||
290 | enc->iv_len = 8; | ||
291 | enc->block_size = 8; | ||
292 | break; | ||
293 | case SSH_CIPHER_ARCFOUR: | ||
294 | enc->key_len = 16; | ||
295 | enc->iv_len = 0; | ||
296 | enc->block_size = 8; | ||
297 | break; | ||
298 | default: | ||
299 | fatal("unsupported cipher %s", name); | ||
300 | } | ||
301 | enc->name = name; | ||
302 | enc->enabled = 0; | ||
303 | enc->iv = NULL; | ||
304 | enc->key = NULL; | ||
305 | } | ||
306 | void | ||
307 | choose_mac(Mac *mac, char *client, char *server) | ||
308 | { | ||
309 | char *name = get_match(client, server); | ||
310 | if (name == NULL) | ||
311 | fatal("no matching mac found: client %s server %s", client, server); | ||
312 | if (strcmp(name, "hmac-md5") == 0) { | ||
313 | mac->md = EVP_md5(); | ||
314 | } else if (strcmp(name, "hmac-sha1") == 0) { | ||
315 | mac->md = EVP_sha1(); | ||
316 | } else if (strcmp(name, "hmac-ripemd160@openssh.com") == 0) { | ||
317 | mac->md = EVP_ripemd160(); | ||
318 | } else { | ||
319 | fatal("unsupported mac %s", name); | ||
320 | } | ||
321 | mac->name = name; | ||
322 | mac->mac_len = mac->md->md_size; | ||
323 | mac->key_len = datafellows ? 16 : mac->mac_len; | ||
324 | mac->key = NULL; | ||
325 | mac->enabled = 0; | ||
326 | } | ||
327 | void | ||
328 | choose_comp(Comp *comp, char *client, char *server) | ||
329 | { | ||
330 | char *name = get_match(client, server); | ||
331 | if (name == NULL) | ||
332 | fatal("no matching comp found: client %s server %s", client, server); | ||
333 | if (strcmp(name, "zlib") == 0) { | ||
334 | comp->type = 1; | ||
335 | } else if (strcmp(name, "none") == 0) { | ||
336 | comp->type = 0; | ||
337 | } else { | ||
338 | fatal("unsupported comp %s", name); | ||
339 | } | ||
340 | comp->name = name; | ||
341 | } | ||
342 | void | ||
343 | choose_kex(Kex *k, char *client, char *server) | ||
344 | { | ||
345 | k->name = get_match(client, server); | ||
346 | if (k->name == NULL) | ||
347 | fatal("no kex alg"); | ||
348 | if (strcmp(k->name, KEX_DH1) != 0) | ||
349 | fatal("bad kex alg %s", k->name); | ||
350 | } | ||
351 | void | ||
352 | choose_hostkeyalg(Kex *k, char *client, char *server) | ||
353 | { | ||
354 | k->hostkeyalg = get_match(client, server); | ||
355 | if (k->hostkeyalg == NULL) | ||
356 | fatal("no hostkey alg"); | ||
357 | if (strcmp(k->hostkeyalg, KEX_DSS) != 0) | ||
358 | fatal("bad hostkey alg %s", k->hostkeyalg); | ||
359 | } | ||
360 | |||
361 | Kex * | ||
362 | kex_choose_conf(char *cprop[PROPOSAL_MAX], char *sprop[PROPOSAL_MAX], int server) | ||
363 | { | ||
364 | int i; | ||
365 | int mode; | ||
366 | int ctos; /* direction: if true client-to-server */ | ||
367 | int need; | ||
368 | Kex *k; | ||
369 | |||
370 | k = xmalloc(sizeof(*k)); | ||
371 | memset(k, 0, sizeof(*k)); | ||
372 | k->server = server; | ||
373 | |||
374 | for (mode = 0; mode < MODE_MAX; mode++) { | ||
375 | int nenc, nmac, ncomp; | ||
376 | ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN); | ||
377 | nenc = ctos ? PROPOSAL_ENC_ALGS_CTOS : PROPOSAL_ENC_ALGS_STOC; | ||
378 | nmac = ctos ? PROPOSAL_MAC_ALGS_CTOS : PROPOSAL_MAC_ALGS_STOC; | ||
379 | ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC; | ||
380 | choose_enc (&k->enc [mode], cprop[nenc], sprop[nenc]); | ||
381 | choose_mac (&k->mac [mode], cprop[nmac], sprop[nmac]); | ||
382 | choose_comp(&k->comp[mode], cprop[ncomp], sprop[ncomp]); | ||
383 | debug("kex: %s %s %s %s", | ||
384 | ctos ? "client->server" : "server->client", | ||
385 | k->enc[mode].name, | ||
386 | k->mac[mode].name, | ||
387 | k->comp[mode].name); | ||
388 | } | ||
389 | choose_kex(k, cprop[PROPOSAL_KEX_ALGS], sprop[PROPOSAL_KEX_ALGS]); | ||
390 | choose_hostkeyalg(k, cprop[PROPOSAL_SERVER_HOST_KEY_ALGS], | ||
391 | sprop[PROPOSAL_SERVER_HOST_KEY_ALGS]); | ||
392 | for (i = 0; i < PROPOSAL_MAX; i++) { | ||
393 | xfree(cprop[i]); | ||
394 | xfree(sprop[i]); | ||
395 | } | ||
396 | need = 0; | ||
397 | for (mode = 0; mode < MODE_MAX; mode++) { | ||
398 | if (need < k->enc[mode].key_len) | ||
399 | need = k->enc[mode].key_len; | ||
400 | if (need < k->enc[mode].iv_len) | ||
401 | need = k->enc[mode].iv_len; | ||
402 | if (need < k->mac[mode].key_len) | ||
403 | need = k->mac[mode].key_len; | ||
404 | } | ||
405 | /* need runden? */ | ||
406 | #define WE_NEED 32 | ||
407 | k->we_need = WE_NEED; | ||
408 | k->we_need = need; | ||
409 | return k; | ||
410 | } | ||
411 | |||
412 | int | ||
413 | kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret) | ||
414 | { | ||
415 | int i; | ||
416 | int mode; | ||
417 | int ctos; | ||
418 | unsigned char *keys[NKEYS]; | ||
419 | |||
420 | for (i = 0; i < NKEYS; i++) | ||
421 | keys[i] = derive_key('A'+i, k->we_need, hash, shared_secret); | ||
422 | |||
423 | for (mode = 0; mode < MODE_MAX; mode++) { | ||
424 | ctos = (!k->server && mode == MODE_OUT) || (k->server && mode == MODE_IN); | ||
425 | k->enc[mode].iv = keys[ctos ? 0 : 1]; | ||
426 | k->enc[mode].key = keys[ctos ? 2 : 3]; | ||
427 | k->mac[mode].key = keys[ctos ? 4 : 5]; | ||
428 | } | ||
429 | return 0; | ||
430 | } | ||