diff options
Diffstat (limited to 'tools/plink/sshdss.c')
| -rw-r--r-- | tools/plink/sshdss.c | 643 |
1 files changed, 0 insertions, 643 deletions
diff --git a/tools/plink/sshdss.c b/tools/plink/sshdss.c deleted file mode 100644 index dba1db1b4..000000000 --- a/tools/plink/sshdss.c +++ /dev/null @@ -1,643 +0,0 @@ -/*
- * Digital Signature Standard implementation for PuTTY.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <assert.h>
-
-#include "ssh.h"
-#include "misc.h"
-
-static void sha_mpint(SHA_State * s, Bignum b)
-{
- unsigned char lenbuf[4];
- int len;
- len = (bignum_bitcount(b) + 8) / 8;
- PUT_32BIT(lenbuf, len);
- SHA_Bytes(s, lenbuf, 4);
- while (len-- > 0) {
- lenbuf[0] = bignum_byte(b, len);
- SHA_Bytes(s, lenbuf, 1);
- }
- memset(lenbuf, 0, sizeof(lenbuf));
-}
-
-static void sha512_mpint(SHA512_State * s, Bignum b)
-{
- unsigned char lenbuf[4];
- int len;
- len = (bignum_bitcount(b) + 8) / 8;
- PUT_32BIT(lenbuf, len);
- SHA512_Bytes(s, lenbuf, 4);
- while (len-- > 0) {
- lenbuf[0] = bignum_byte(b, len);
- SHA512_Bytes(s, lenbuf, 1);
- }
- memset(lenbuf, 0, sizeof(lenbuf));
-}
-
-static void getstring(char **data, int *datalen, char **p, int *length)
-{
- *p = NULL;
- if (*datalen < 4)
- return;
- *length = GET_32BIT(*data);
- *datalen -= 4;
- *data += 4;
- if (*datalen < *length)
- return;
- *p = *data;
- *data += *length;
- *datalen -= *length;
-}
-static Bignum getmp(char **data, int *datalen)
-{
- char *p;
- int length;
- Bignum b;
-
- getstring(data, datalen, &p, &length);
- if (!p)
- return NULL;
- if (p[0] & 0x80)
- return NULL; /* negative mp */
- b = bignum_from_bytes((unsigned char *)p, length);
- return b;
-}
-
-static Bignum get160(char **data, int *datalen)
-{
- Bignum b;
-
- b = bignum_from_bytes((unsigned char *)*data, 20);
- *data += 20;
- *datalen -= 20;
-
- return b;
-}
-
-static void *dss_newkey(char *data, int len)
-{
- char *p;
- int slen;
- struct dss_key *dss;
-
- dss = snew(struct dss_key);
- if (!dss)
- return NULL;
- getstring(&data, &len, &p, &slen);
-
-#ifdef DEBUG_DSS
- {
- int i;
- printf("key:");
- for (i = 0; i < len; i++)
- printf(" %02x", (unsigned char) (data[i]));
- printf("\n");
- }
-#endif
-
- if (!p || memcmp(p, "ssh-dss", 7)) {
- sfree(dss);
- return NULL;
- }
- dss->p = getmp(&data, &len);
- dss->q = getmp(&data, &len);
- dss->g = getmp(&data, &len);
- dss->y = getmp(&data, &len);
-
- return dss;
-}
-
-static void dss_freekey(void *key)
-{
- struct dss_key *dss = (struct dss_key *) key;
- freebn(dss->p);
- freebn(dss->q);
- freebn(dss->g);
- freebn(dss->y);
- sfree(dss);
-}
-
-static char *dss_fmtkey(void *key)
-{
- struct dss_key *dss = (struct dss_key *) key;
- char *p;
- int len, i, pos, nibbles;
- static const char hex[] = "0123456789abcdef";
- if (!dss->p)
- return NULL;
- len = 8 + 4 + 1; /* 4 x "0x", punctuation, \0 */
- len += 4 * (bignum_bitcount(dss->p) + 15) / 16;
- len += 4 * (bignum_bitcount(dss->q) + 15) / 16;
- len += 4 * (bignum_bitcount(dss->g) + 15) / 16;
- len += 4 * (bignum_bitcount(dss->y) + 15) / 16;
- p = snewn(len, char);
- if (!p)
- return NULL;
-
- pos = 0;
- pos += sprintf(p + pos, "0x");
- nibbles = (3 + bignum_bitcount(dss->p)) / 4;
- if (nibbles < 1)
- nibbles = 1;
- for (i = nibbles; i--;)
- p[pos++] =
- hex[(bignum_byte(dss->p, i / 2) >> (4 * (i % 2))) & 0xF];
- pos += sprintf(p + pos, ",0x");
- nibbles = (3 + bignum_bitcount(dss->q)) / 4;
- if (nibbles < 1)
- nibbles = 1;
- for (i = nibbles; i--;)
- p[pos++] =
- hex[(bignum_byte(dss->q, i / 2) >> (4 * (i % 2))) & 0xF];
- pos += sprintf(p + pos, ",0x");
- nibbles = (3 + bignum_bitcount(dss->g)) / 4;
- if (nibbles < 1)
- nibbles = 1;
- for (i = nibbles; i--;)
- p[pos++] =
- hex[(bignum_byte(dss->g, i / 2) >> (4 * (i % 2))) & 0xF];
- pos += sprintf(p + pos, ",0x");
- nibbles = (3 + bignum_bitcount(dss->y)) / 4;
- if (nibbles < 1)
- nibbles = 1;
- for (i = nibbles; i--;)
- p[pos++] =
- hex[(bignum_byte(dss->y, i / 2) >> (4 * (i % 2))) & 0xF];
- p[pos] = '\0';
- return p;
-}
-
-static char *dss_fingerprint(void *key)
-{
- struct dss_key *dss = (struct dss_key *) key;
- struct MD5Context md5c;
- unsigned char digest[16], lenbuf[4];
- char buffer[16 * 3 + 40];
- char *ret;
- int numlen, i;
-
- MD5Init(&md5c);
- MD5Update(&md5c, (unsigned char *)"\0\0\0\7ssh-dss", 11);
-
-#define ADD_BIGNUM(bignum) \
- numlen = (bignum_bitcount(bignum)+8)/8; \
- PUT_32BIT(lenbuf, numlen); MD5Update(&md5c, lenbuf, 4); \
- for (i = numlen; i-- ;) { \
- unsigned char c = bignum_byte(bignum, i); \
- MD5Update(&md5c, &c, 1); \
- }
- ADD_BIGNUM(dss->p);
- ADD_BIGNUM(dss->q);
- ADD_BIGNUM(dss->g);
- ADD_BIGNUM(dss->y);
-#undef ADD_BIGNUM
-
- MD5Final(digest, &md5c);
-
- sprintf(buffer, "ssh-dss %d ", bignum_bitcount(dss->p));
- for (i = 0; i < 16; i++)
- sprintf(buffer + strlen(buffer), "%s%02x", i ? ":" : "",
- digest[i]);
- ret = snewn(strlen(buffer) + 1, char);
- if (ret)
- strcpy(ret, buffer);
- return ret;
-}
-
-static int dss_verifysig(void *key, char *sig, int siglen,
- char *data, int datalen)
-{
- struct dss_key *dss = (struct dss_key *) key;
- char *p;
- int slen;
- char hash[20];
- Bignum r, s, w, gu1p, yu2p, gu1yu2p, u1, u2, sha, v;
- int ret;
-
- if (!dss->p)
- return 0;
-
-#ifdef DEBUG_DSS
- {
- int i;
- printf("sig:");
- for (i = 0; i < siglen; i++)
- printf(" %02x", (unsigned char) (sig[i]));
- printf("\n");
- }
-#endif
- /*
- * Commercial SSH (2.0.13) and OpenSSH disagree over the format
- * of a DSA signature. OpenSSH is in line with RFC 4253:
- * it uses a string "ssh-dss", followed by a 40-byte string
- * containing two 160-bit integers end-to-end. Commercial SSH
- * can't be bothered with the header bit, and considers a DSA
- * signature blob to be _just_ the 40-byte string containing
- * the two 160-bit integers. We tell them apart by measuring
- * the length: length 40 means the commercial-SSH bug, anything
- * else is assumed to be RFC-compliant.
- */
- if (siglen != 40) { /* bug not present; read admin fields */
- getstring(&sig, &siglen, &p, &slen);
- if (!p || slen != 7 || memcmp(p, "ssh-dss", 7)) {
- return 0;
- }
- sig += 4, siglen -= 4; /* skip yet another length field */
- }
- r = get160(&sig, &siglen);
- s = get160(&sig, &siglen);
- if (!r || !s)
- return 0;
-
- /*
- * Step 1. w <- s^-1 mod q.
- */
- w = modinv(s, dss->q);
-
- /*
- * Step 2. u1 <- SHA(message) * w mod q.
- */
- SHA_Simple(data, datalen, (unsigned char *)hash);
- p = hash;
- slen = 20;
- sha = get160(&p, &slen);
- u1 = modmul(sha, w, dss->q);
-
- /*
- * Step 3. u2 <- r * w mod q.
- */
- u2 = modmul(r, w, dss->q);
-
- /*
- * Step 4. v <- (g^u1 * y^u2 mod p) mod q.
- */
- gu1p = modpow(dss->g, u1, dss->p);
- yu2p = modpow(dss->y, u2, dss->p);
- gu1yu2p = modmul(gu1p, yu2p, dss->p);
- v = modmul(gu1yu2p, One, dss->q);
-
- /*
- * Step 5. v should now be equal to r.
- */
-
- ret = !bignum_cmp(v, r);
-
- freebn(w);
- freebn(sha);
- freebn(gu1p);
- freebn(yu2p);
- freebn(gu1yu2p);
- freebn(v);
- freebn(r);
- freebn(s);
-
- return ret;
-}
-
-static unsigned char *dss_public_blob(void *key, int *len)
-{
- struct dss_key *dss = (struct dss_key *) key;
- int plen, qlen, glen, ylen, bloblen;
- int i;
- unsigned char *blob, *p;
-
- plen = (bignum_bitcount(dss->p) + 8) / 8;
- qlen = (bignum_bitcount(dss->q) + 8) / 8;
- glen = (bignum_bitcount(dss->g) + 8) / 8;
- ylen = (bignum_bitcount(dss->y) + 8) / 8;
-
- /*
- * string "ssh-dss", mpint p, mpint q, mpint g, mpint y. Total
- * 27 + sum of lengths. (five length fields, 20+7=27).
- */
- bloblen = 27 + plen + qlen + glen + ylen;
- blob = snewn(bloblen, unsigned char);
- p = blob;
- PUT_32BIT(p, 7);
- p += 4;
- memcpy(p, "ssh-dss", 7);
- p += 7;
- PUT_32BIT(p, plen);
- p += 4;
- for (i = plen; i--;)
- *p++ = bignum_byte(dss->p, i);
- PUT_32BIT(p, qlen);
- p += 4;
- for (i = qlen; i--;)
- *p++ = bignum_byte(dss->q, i);
- PUT_32BIT(p, glen);
- p += 4;
- for (i = glen; i--;)
- *p++ = bignum_byte(dss->g, i);
- PUT_32BIT(p, ylen);
- p += 4;
- for (i = ylen; i--;)
- *p++ = bignum_byte(dss->y, i);
- assert(p == blob + bloblen);
- *len = bloblen;
- return blob;
-}
-
-static unsigned char *dss_private_blob(void *key, int *len)
-{
- struct dss_key *dss = (struct dss_key *) key;
- int xlen, bloblen;
- int i;
- unsigned char *blob, *p;
-
- xlen = (bignum_bitcount(dss->x) + 8) / 8;
-
- /*
- * mpint x, string[20] the SHA of p||q||g. Total 4 + xlen.
- */
- bloblen = 4 + xlen;
- blob = snewn(bloblen, unsigned char);
- p = blob;
- PUT_32BIT(p, xlen);
- p += 4;
- for (i = xlen; i--;)
- *p++ = bignum_byte(dss->x, i);
- assert(p == blob + bloblen);
- *len = bloblen;
- return blob;
-}
-
-static void *dss_createkey(unsigned char *pub_blob, int pub_len,
- unsigned char *priv_blob, int priv_len)
-{
- struct dss_key *dss;
- char *pb = (char *) priv_blob;
- char *hash;
- int hashlen;
- SHA_State s;
- unsigned char digest[20];
- Bignum ytest;
-
- dss = dss_newkey((char *) pub_blob, pub_len);
- dss->x = getmp(&pb, &priv_len);
-
- /*
- * Check the obsolete hash in the old DSS key format.
- */
- hashlen = -1;
- getstring(&pb, &priv_len, &hash, &hashlen);
- if (hashlen == 20) {
- SHA_Init(&s);
- sha_mpint(&s, dss->p);
- sha_mpint(&s, dss->q);
- sha_mpint(&s, dss->g);
- SHA_Final(&s, digest);
- if (0 != memcmp(hash, digest, 20)) {
- dss_freekey(dss);
- return NULL;
- }
- }
-
- /*
- * Now ensure g^x mod p really is y.
- */
- ytest = modpow(dss->g, dss->x, dss->p);
- if (0 != bignum_cmp(ytest, dss->y)) {
- dss_freekey(dss);
- return NULL;
- }
- freebn(ytest);
-
- return dss;
-}
-
-static void *dss_openssh_createkey(unsigned char **blob, int *len)
-{
- char **b = (char **) blob;
- struct dss_key *dss;
-
- dss = snew(struct dss_key);
- if (!dss)
- return NULL;
-
- dss->p = getmp(b, len);
- dss->q = getmp(b, len);
- dss->g = getmp(b, len);
- dss->y = getmp(b, len);
- dss->x = getmp(b, len);
-
- if (!dss->p || !dss->q || !dss->g || !dss->y || !dss->x) {
- sfree(dss->p);
- sfree(dss->q);
- sfree(dss->g);
- sfree(dss->y);
- sfree(dss->x);
- sfree(dss);
- return NULL;
- }
-
- return dss;
-}
-
-static int dss_openssh_fmtkey(void *key, unsigned char *blob, int len)
-{
- struct dss_key *dss = (struct dss_key *) key;
- int bloblen, i;
-
- bloblen =
- ssh2_bignum_length(dss->p) +
- ssh2_bignum_length(dss->q) +
- ssh2_bignum_length(dss->g) +
- ssh2_bignum_length(dss->y) +
- ssh2_bignum_length(dss->x);
-
- if (bloblen > len)
- return bloblen;
-
- bloblen = 0;
-#define ENC(x) \
- PUT_32BIT(blob+bloblen, ssh2_bignum_length((x))-4); bloblen += 4; \
- for (i = ssh2_bignum_length((x))-4; i-- ;) blob[bloblen++]=bignum_byte((x),i);
- ENC(dss->p);
- ENC(dss->q);
- ENC(dss->g);
- ENC(dss->y);
- ENC(dss->x);
-
- return bloblen;
-}
-
-static int dss_pubkey_bits(void *blob, int len)
-{
- struct dss_key *dss;
- int ret;
-
- dss = dss_newkey((char *) blob, len);
- ret = bignum_bitcount(dss->p);
- dss_freekey(dss);
-
- return ret;
-}
-
-static unsigned char *dss_sign(void *key, char *data, int datalen, int *siglen)
-{
- /*
- * The basic DSS signing algorithm is:
- *
- * - invent a random k between 1 and q-1 (exclusive).
- * - Compute r = (g^k mod p) mod q.
- * - Compute s = k^-1 * (hash + x*r) mod q.
- *
- * This has the dangerous properties that:
- *
- * - if an attacker in possession of the public key _and_ the
- * signature (for example, the host you just authenticated
- * to) can guess your k, he can reverse the computation of s
- * and work out x = r^-1 * (s*k - hash) mod q. That is, he
- * can deduce the private half of your key, and masquerade
- * as you for as long as the key is still valid.
- *
- * - since r is a function purely of k and the public key, if
- * the attacker only has a _range of possibilities_ for k
- * it's easy for him to work through them all and check each
- * one against r; he'll never be unsure of whether he's got
- * the right one.
- *
- * - if you ever sign two different hashes with the same k, it
- * will be immediately obvious because the two signatures
- * will have the same r, and moreover an attacker in
- * possession of both signatures (and the public key of
- * course) can compute k = (hash1-hash2) * (s1-s2)^-1 mod q,
- * and from there deduce x as before.
- *
- * - the Bleichenbacher attack on DSA makes use of methods of
- * generating k which are significantly non-uniformly
- * distributed; in particular, generating a 160-bit random
- * number and reducing it mod q is right out.
- *
- * For this reason we must be pretty careful about how we
- * generate our k. Since this code runs on Windows, with no
- * particularly good system entropy sources, we can't trust our
- * RNG itself to produce properly unpredictable data. Hence, we
- * use a totally different scheme instead.
- *
- * What we do is to take a SHA-512 (_big_) hash of the private
- * key x, and then feed this into another SHA-512 hash that
- * also includes the message hash being signed. That is:
- *
- * proto_k = SHA512 ( SHA512(x) || SHA160(message) )
- *
- * This number is 512 bits long, so reducing it mod q won't be
- * noticeably non-uniform. So
- *
- * k = proto_k mod q
- *
- * This has the interesting property that it's _deterministic_:
- * signing the same hash twice with the same key yields the
- * same signature.
- *
- * Despite this determinism, it's still not predictable to an
- * attacker, because in order to repeat the SHA-512
- * construction that created it, the attacker would have to
- * know the private key value x - and by assumption he doesn't,
- * because if he knew that he wouldn't be attacking k!
- *
- * (This trick doesn't, _per se_, protect against reuse of k.
- * Reuse of k is left to chance; all it does is prevent
- * _excessively high_ chances of reuse of k due to entropy
- * problems.)
- *
- * Thanks to Colin Plumb for the general idea of using x to
- * ensure k is hard to guess, and to the Cambridge University
- * Computer Security Group for helping to argue out all the
- * fine details.
- */
- struct dss_key *dss = (struct dss_key *) key;
- SHA512_State ss;
- unsigned char digest[20], digest512[64];
- Bignum proto_k, k, gkp, hash, kinv, hxr, r, s;
- unsigned char *bytes;
- int nbytes, i;
-
- SHA_Simple(data, datalen, digest);
-
- /*
- * Hash some identifying text plus x.
- */
- SHA512_Init(&ss);
- SHA512_Bytes(&ss, "DSA deterministic k generator", 30);
- sha512_mpint(&ss, dss->x);
- SHA512_Final(&ss, digest512);
-
- /*
- * Now hash that digest plus the message hash.
- */
- SHA512_Init(&ss);
- SHA512_Bytes(&ss, digest512, sizeof(digest512));
- SHA512_Bytes(&ss, digest, sizeof(digest));
- SHA512_Final(&ss, digest512);
-
- memset(&ss, 0, sizeof(ss));
-
- /*
- * Now convert the result into a bignum, and reduce it mod q.
- */
- proto_k = bignum_from_bytes(digest512, 64);
- k = bigmod(proto_k, dss->q);
- freebn(proto_k);
-
- memset(digest512, 0, sizeof(digest512));
-
- /*
- * Now we have k, so just go ahead and compute the signature.
- */
- gkp = modpow(dss->g, k, dss->p); /* g^k mod p */
- r = bigmod(gkp, dss->q); /* r = (g^k mod p) mod q */
- freebn(gkp);
-
- hash = bignum_from_bytes(digest, 20);
- kinv = modinv(k, dss->q); /* k^-1 mod q */
- hxr = bigmuladd(dss->x, r, hash); /* hash + x*r */
- s = modmul(kinv, hxr, dss->q); /* s = k^-1 * (hash + x*r) mod q */
- freebn(hxr);
- freebn(kinv);
- freebn(hash);
-
- /*
- * Signature blob is
- *
- * string "ssh-dss"
- * string two 20-byte numbers r and s, end to end
- *
- * i.e. 4+7 + 4+40 bytes.
- */
- nbytes = 4 + 7 + 4 + 40;
- bytes = snewn(nbytes, unsigned char);
- PUT_32BIT(bytes, 7);
- memcpy(bytes + 4, "ssh-dss", 7);
- PUT_32BIT(bytes + 4 + 7, 40);
- for (i = 0; i < 20; i++) {
- bytes[4 + 7 + 4 + i] = bignum_byte(r, 19 - i);
- bytes[4 + 7 + 4 + 20 + i] = bignum_byte(s, 19 - i);
- }
- freebn(r);
- freebn(s);
-
- *siglen = nbytes;
- return bytes;
-}
-
-const struct ssh_signkey ssh_dss = {
- dss_newkey,
- dss_freekey,
- dss_fmtkey,
- dss_public_blob,
- dss_private_blob,
- dss_createkey,
- dss_openssh_createkey,
- dss_openssh_fmtkey,
- dss_pubkey_bits,
- dss_fingerprint,
- dss_verifysig,
- dss_sign,
- "ssh-dss",
- "dss"
-};
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