ports/libssh
ports/libssh
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Код Релизы 1 Активность

pki: Handle hash correctly.

Просмотр исходного кода 
Looks like only DSA in grypt needs a leading zero to mark the has as
positive. See

http://lists.gnupg.org/pipermail/gcrypt-devel/2005-February/000754.html
Этот коммит содержится в:
Andreas Schneider 2011-08-26 23:13:57 +02:00
родитель 228e2edac5
Коммит 79ed1bc601
4 изменённых файлов: 57 добавлений и 50 удалений
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5
include/libssh/pki_priv.h
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@ -59,12 +59,13 @@ int pki_signature_verify(ssh_session session,
const ssh_signature sig,
const ssh_key key,
const unsigned char *hash,
size_t len);
size_t hlen);
/* SSH Signing Functions */
ssh_signature pki_do_sign(const ssh_key privkey,
const unsigned char *hash,
size_t hlen);
ssh_signature pki_do_sign_sessionid(const ssh_key key,
const unsigned char *hash);
const unsigned char *hash,
size_t hlen);
#endif /* PKI_PRIV_H_ */

22
src/pki.c
Просмотреть файл

@ -1022,7 +1022,7 @@ int ssh_pki_signature_verify_blob(ssh_session session,
unsigned char *digest,
size_t dlen)
{
unsigned char hash[SHA_DIGEST_LEN + 1] = {0};
unsigned char hash[SHA_DIGEST_LEN] = {0};
ssh_signature sig;
int rc;
@ -1038,10 +1038,10 @@ int ssh_pki_signature_verify_blob(ssh_session session,
key->type_c);
sha1(digest, dlen, hash + 1);
sha1(digest, dlen, hash);
#ifdef DEBUG_CRYPTO
ssh_print_hexa("Hash to be verified with dsa", hash + 1, SHA_DIGEST_LEN);
ssh_print_hexa("Hash to be verified with dsa", hash, SHA_DIGEST_LEN);
#endif
rc = pki_signature_verify(session,
@ -1063,7 +1063,7 @@ ssh_string ssh_pki_do_sign(ssh_session session,
struct ssh_crypto_struct *crypto =
session->current_crypto ? session->current_crypto :
session->next_crypto;
unsigned char hash[SHA_DIGEST_LEN + 1] = {0};
unsigned char hash[SHA_DIGEST_LEN] = {0};
ssh_signature sig;
ssh_string sig_blob = NULL;
ssh_string str = NULL;
@ -1089,11 +1089,10 @@ ssh_string ssh_pki_do_sign(ssh_session session,
sha1_update(ctx, str, ssh_string_len(str) + 4);
ssh_string_free(str);
sha1_update(ctx, buffer_get_rest(sigbuf), buffer_get_rest_len(sigbuf));
sha1_final(hash + 1, ctx);
hash[0] = 0;
sha1_final(hash, ctx);
#ifdef DEBUG_CRYPTO
ssh_print_hexa("Hash being signed with dsa", hash + 1, SHA_DIGEST_LEN);
ssh_print_hexa("Hash being signed with dsa", hash, SHA_DIGEST_LEN);
#endif
sig = pki_do_sign(privkey, hash, SHA_DIGEST_LEN);
@ -1169,7 +1168,7 @@ ssh_string ssh_srv_pki_do_sign_sessionid(ssh_session session,
struct ssh_crypto_struct *crypto =
session->current_crypto ? session->current_crypto :
session->next_crypto;
unsigned char hash[SHA_DIGEST_LEN + 1] = {0};
unsigned char hash[SHA_DIGEST_LEN] = {0};
ssh_signature sig;
ssh_string sig_blob;
SHACTX ctx;
@ -1184,14 +1183,13 @@ ssh_string ssh_srv_pki_do_sign_sessionid(ssh_session session,
return NULL;
}
sha1_update(ctx, crypto->session_id, SHA_DIGEST_LEN);
sha1_final(hash + 1, ctx);
hash[0] = 0;
sha1_final(hash, ctx);
#ifdef DEBUG_CRYPTO
ssh_print_hexa("Hash being signed", hash + 1, SHA_DIGEST_LEN);
ssh_print_hexa("Hash being signed", hash, SHA_DIGEST_LEN);
#endif
sig = pki_do_sign_sessionid(privkey, hash);
sig = pki_do_sign_sessionid(privkey, hash, SHA_DIGEST_LEN);
if (sig == NULL) {
return NULL;
}

21
src/pki_crypto.c
Просмотреть файл

@ -677,14 +677,14 @@ int pki_signature_verify(ssh_session session,
const ssh_signature sig,
const ssh_key key,
const unsigned char *hash,
size_t len)
size_t hlen)
{
int rc;
switch(key->type) {
case SSH_KEYTYPE_DSS:
rc = DSA_do_verify(hash + 1,
len,
rc = DSA_do_verify(hash,
hlen,
sig->dsa_sig,
key->dsa);
if (rc < 0) {
@ -698,8 +698,8 @@ int pki_signature_verify(ssh_session session,
case SSH_KEYTYPE_RSA:
case SSH_KEYTYPE_RSA1:
rc = RSA_verify(NID_sha1,
hash + 1,
len,
hash,
hlen,
string_data(sig->rsa_sig),
ssh_string_len(sig->rsa_sig),
key->rsa);
@ -734,7 +734,7 @@ ssh_signature pki_do_sign(const ssh_key privkey,
switch(privkey->type) {
case SSH_KEYTYPE_DSS:
sig->dsa_sig = DSA_do_sign(hash + 1, hlen, privkey->dsa);
sig->dsa_sig = DSA_do_sign(hash, hlen, privkey->dsa);
if (sig->dsa_sig == NULL) {
ssh_signature_free(sig);
return NULL;
@ -748,7 +748,7 @@ ssh_signature pki_do_sign(const ssh_key privkey,
break;
case SSH_KEYTYPE_RSA:
case SSH_KEYTYPE_RSA1:
sig->rsa_sig = _RSA_do_sign(hash + 1, hlen, privkey->rsa);
sig->rsa_sig = _RSA_do_sign(hash, hlen, privkey->rsa);
if (sig->rsa_sig == NULL) {
ssh_signature_free(sig);
return NULL;
@ -766,7 +766,8 @@ ssh_signature pki_do_sign(const ssh_key privkey,
#ifdef WITH_SERVER
ssh_signature pki_do_sign_sessionid(const ssh_key key,
const unsigned char *hash)
const unsigned char *hash,
size_t hlen)
{
ssh_signature sig;
@ -778,7 +779,7 @@ ssh_signature pki_do_sign_sessionid(const ssh_key key,
switch(key->type) {
case SSH_KEYTYPE_DSS:
sig->dsa_sig = DSA_do_sign(hash + 1, SHA_DIGEST_LEN, key->dsa);
sig->dsa_sig = DSA_do_sign(hash, hlen, key->dsa);
if (sig->dsa_sig == NULL) {
ssh_signature_free(sig);
return NULL;
@ -786,7 +787,7 @@ ssh_signature pki_do_sign_sessionid(const ssh_key key,
break;
case SSH_KEYTYPE_RSA:
case SSH_KEYTYPE_RSA1:
sig->rsa_sig = _RSA_do_sign(hash + 1, SHA_DIGEST_LEN, key->rsa);
sig->rsa_sig = _RSA_do_sign(hash, hlen, key->rsa);
if (sig->rsa_sig == NULL) {
ssh_signature_free(sig);
return NULL;

59
src/pki_gcrypt.c
Просмотреть файл

@ -1322,19 +1322,23 @@ int pki_signature_verify(ssh_session session,
const ssh_signature sig,
const ssh_key key,
const unsigned char *hash,
size_t len)
size_t hlen)
{
unsigned char ghash[hlen + 1];
gcry_sexp_t sexp;
gcry_error_t err;
switch(key->type) {
case SSH_KEYTYPE_DSS:
if(hash[1] < 0x80) {
hash = hash + 1;
} else {
len = len + 1;
/* That is to mark the number as positive */
if(hash[0] >= 0x80) {
memcpy(ghash + 1, hash, hlen);
ghash[0] = 0;
hash = ghash;
hlen += 1;
}
err = gcry_sexp_build(&sexp, NULL, "%b", len, hash);
err = gcry_sexp_build(&sexp, NULL, "%b", hlen, hash);
if (err) {
ssh_set_error(session,
SSH_FATAL,
@ -1359,7 +1363,7 @@ int pki_signature_verify(ssh_session session,
err = gcry_sexp_build(&sexp,
NULL,
"(data(flags pkcs1)(hash sha1 %b))",
len, hash + 1);
hlen, hash);
if (err) {
ssh_set_error(session,
SSH_FATAL,
@ -1392,6 +1396,7 @@ int pki_signature_verify(ssh_session session,
ssh_signature pki_do_sign(const ssh_key privkey,
const unsigned char *hash,
size_t hlen) {
unsigned char ghash[hlen + 1];
ssh_signature sig;
gcry_sexp_t sexp;
gcry_error_t err;
@ -1404,11 +1409,14 @@ ssh_signature pki_do_sign(const ssh_key privkey,
switch (privkey->type) {
case SSH_KEYTYPE_DSS:
if(hash[1] < 0x80) {
hash = hash + 1;
} else {
hlen = hlen + 1;
/* That is to mark the number as positive */
if(hash[0] >= 0x80) {
memcpy(ghash + 1, hash, hlen);
ghash[0] = 0;
hash = ghash;
hlen += 1;
}
err = gcry_sexp_build(&sexp, NULL, "%b", hlen, hash);
if (err) {
ssh_signature_free(sig);
@ -1428,7 +1436,7 @@ ssh_signature pki_do_sign(const ssh_key privkey,
NULL,
"(data(flags pkcs1)(hash sha1 %b))",
hlen,
hash + 1);
hash);
if (err) {
ssh_signature_free(sig);
return NULL;
@ -1452,12 +1460,13 @@ ssh_signature pki_do_sign(const ssh_key privkey,
#ifdef WITH_SERVER
ssh_signature pki_do_sign_sessionid(const ssh_key key,
const unsigned char *hash)
const unsigned char *hash,
size_t hlen)
{
unsigned char ghash[hlen + 1];
ssh_signature sig;
gcry_sexp_t sexp;
gcry_error_t err;
size_t len;
sig = ssh_signature_new();
if (sig == NULL) {
@ -1467,17 +1476,15 @@ ssh_signature pki_do_sign_sessionid(const ssh_key key,
switch(key->type) {
case SSH_KEYTYPE_DSS:
len = SHA_DIGEST_LEN;
if(hash[1] < 0x80) {
hash = hash + 1;
} else {
len = len + 1;
/* That is to mark the number as positive */
if(hash[0] >= 0x80) {
memcpy(ghash + 1, hash, hlen);
ghash[0] = 0;
hash = ghash;
hlen += 1;
}
err = gcry_sexp_build(&sexp,
NULL,
"%b",
len,
hash);
err = gcry_sexp_build(&sexp, NULL, "%b", hlen, hash);
if (err) {
ssh_signature_free(sig);
return NULL;
@ -1494,8 +1501,8 @@ ssh_signature pki_do_sign_sessionid(const ssh_key key,
err = gcry_sexp_build(&sexp,
NULL,
"(data(flags pkcs1)(hash sha1 %b))",
SHA_DIGEST_LEN,
hash + 1);
hlen,
hash);
if (err) {
ssh_signature_free(sig);
return NULL;