version 1.32.2.5, 2001/09/27 00:15:41 |
version 1.32.2.6, 2002/03/08 17:04:41 |
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#include "log.h" |
#include "log.h" |
#include "servconf.h" |
#include "servconf.h" |
#include "auth.h" |
#include "auth.h" |
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#include "hostfile.h" |
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/* import */ |
/* import */ |
extern ServerOptions options; |
extern ServerOptions options; |
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u_char buf[32], mdbuf[16], response[16]; |
u_char buf[32], mdbuf[16], response[16]; |
MD5_CTX md; |
MD5_CTX md; |
u_int i; |
u_int i; |
int plen, len; |
int len; |
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encrypted_challenge = BN_new(); |
if ((encrypted_challenge = BN_new()) == NULL) |
challenge = BN_new(); |
fatal("auth_rsa_challenge_dialog: BN_new() failed"); |
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if ((challenge = BN_new()) == NULL) |
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fatal("auth_rsa_challenge_dialog: BN_new() failed"); |
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/* Generate a random challenge. */ |
/* Generate a random challenge. */ |
BN_rand(challenge, 256, 0, 0); |
BN_rand(challenge, 256, 0, 0); |
ctx = BN_CTX_new(); |
if ((ctx = BN_CTX_new()) == NULL) |
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fatal("auth_rsa_challenge_dialog: BN_CTX_new() failed"); |
BN_mod(challenge, challenge, pk->n, ctx); |
BN_mod(challenge, challenge, pk->n, ctx); |
BN_CTX_free(ctx); |
BN_CTX_free(ctx); |
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packet_write_wait(); |
packet_write_wait(); |
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/* Wait for a response. */ |
/* Wait for a response. */ |
packet_read_expect(&plen, SSH_CMSG_AUTH_RSA_RESPONSE); |
packet_read_expect(SSH_CMSG_AUTH_RSA_RESPONSE); |
packet_integrity_check(plen, 16, SSH_CMSG_AUTH_RSA_RESPONSE); |
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for (i = 0; i < 16; i++) |
for (i = 0; i < 16; i++) |
response[i] = packet_get_char(); |
response[i] = packet_get_char(); |
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packet_check_eom(); |
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/* The response is MD5 of decrypted challenge plus session id. */ |
/* The response is MD5 of decrypted challenge plus session id. */ |
len = BN_num_bytes(challenge); |
len = BN_num_bytes(challenge); |
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FILE *f; |
FILE *f; |
u_long linenum = 0; |
u_long linenum = 0; |
struct stat st; |
struct stat st; |
RSA *pk; |
Key *key; |
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char *fp; |
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/* no user given */ |
/* no user given */ |
if (pw == NULL) |
if (pw == NULL) |
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/* Flag indicating whether authentication has succeeded. */ |
/* Flag indicating whether authentication has succeeded. */ |
authenticated = 0; |
authenticated = 0; |
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pk = RSA_new(); |
key = key_new(KEY_RSA1); |
pk->e = BN_new(); |
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pk->n = BN_new(); |
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/* |
/* |
* Go though the accepted keys, looking for the current key. If |
* Go though the accepted keys, looking for the current key. If |
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options = NULL; |
options = NULL; |
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/* Parse the key from the line. */ |
/* Parse the key from the line. */ |
if (!auth_rsa_read_key(&cp, &bits, pk->e, pk->n)) { |
if (hostfile_read_key(&cp, &bits, key) == 0) { |
debug("%.100s, line %lu: non ssh1 key syntax", |
debug("%.100s, line %lu: non ssh1 key syntax", |
file, linenum); |
file, linenum); |
continue; |
continue; |
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/* cp now points to the comment part. */ |
/* cp now points to the comment part. */ |
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/* Check if the we have found the desired key (identified by its modulus). */ |
/* Check if the we have found the desired key (identified by its modulus). */ |
if (BN_cmp(pk->n, client_n) != 0) |
if (BN_cmp(key->rsa->n, client_n) != 0) |
continue; |
continue; |
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/* check the real bits */ |
/* check the real bits */ |
if (bits != BN_num_bits(pk->n)) |
if (bits != BN_num_bits(key->rsa->n)) |
log("Warning: %s, line %lu: keysize mismatch: " |
log("Warning: %s, line %lu: keysize mismatch: " |
"actual %d vs. announced %d.", |
"actual %d vs. announced %d.", |
file, linenum, BN_num_bits(pk->n), bits); |
file, linenum, BN_num_bits(key->rsa->n), bits); |
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/* We have found the desired key. */ |
/* We have found the desired key. */ |
/* |
/* |
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continue; |
continue; |
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/* Perform the challenge-response dialog for this key. */ |
/* Perform the challenge-response dialog for this key. */ |
if (!auth_rsa_challenge_dialog(pk)) { |
if (!auth_rsa_challenge_dialog(key->rsa)) { |
/* Wrong response. */ |
/* Wrong response. */ |
verbose("Wrong response to RSA authentication challenge."); |
verbose("Wrong response to RSA authentication challenge."); |
packet_send_debug("Wrong response to RSA authentication challenge."); |
packet_send_debug("Wrong response to RSA authentication challenge."); |
continue; |
/* |
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* Break out of the loop. Otherwise we might send |
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* another challenge and break the protocol. |
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*/ |
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break; |
} |
} |
/* |
/* |
* Correct response. The client has been successfully |
* Correct response. The client has been successfully |
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* otherwise continue searching. |
* otherwise continue searching. |
*/ |
*/ |
authenticated = 1; |
authenticated = 1; |
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fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
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verbose("Found matching %s key: %s", |
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key_type(key), fp); |
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xfree(fp); |
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break; |
break; |
} |
} |
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xfree(file); |
xfree(file); |
fclose(f); |
fclose(f); |
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RSA_free(pk); |
key_free(key); |
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if (authenticated) |
if (authenticated) |
packet_send_debug("RSA authentication accepted."); |
packet_send_debug("RSA authentication accepted."); |