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Add TIS authentication option

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[originally from svn r283]
This commit is contained in:
Simon Tatham
1999-11-08 17:42:12 +00:00
parent a764191663
commit 59e798fc6d
5 changed files with 58 additions and 11 deletions
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58
ssh.c
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@ -29,6 +29,11 @@
#define SSH_MSG_IGNORE 32
#define SSH_CMSG_EXIT_CONFIRMATION 33
#define SSH_MSG_DEBUG 36
#define SSH_CMSG_AUTH_TIS 39
#define SSH_SMSG_AUTH_TIS_CHALLENGE 40
#define SSH_CMSG_AUTH_TIS_RESPONSE 41
#define SSH_AUTH_TIS 5
/* Coroutine mechanics for the sillier bits of the code */
#define crBegin1 static int crLine = 0;
@ -293,7 +298,7 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
unsigned char cookie[8];
struct RSAKey servkey, hostkey;
struct MD5Context md5c;
unsigned long supported_ciphers_mask;
static unsigned long supported_ciphers_mask, supported_auths_mask;
int cipher_type;
extern struct ssh_cipher ssh_3des;
@ -318,10 +323,15 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
j = makekey(pktin.body+8+i, &hostkey, &keystr2);
supported_ciphers_mask = (pktin.body[12+i+j] << 24) |
(pktin.body[13+i+j] << 16) |
(pktin.body[14+i+j] << 8) |
(pktin.body[15+i+j]);
supported_ciphers_mask = ((pktin.body[12+i+j] << 24) |
(pktin.body[13+i+j] << 16) |
(pktin.body[14+i+j] << 8) |
(pktin.body[15+i+j]));
supported_auths_mask = ((pktin.body[16+i+j] << 24) |
(pktin.body[17+i+j] << 16) |
(pktin.body[18+i+j] << 8) |
(pktin.body[19+i+j]));
MD5Update(&md5c, keystr2, hostkey.bytes);
MD5Update(&md5c, keystr1, servkey.bytes);
@ -444,7 +454,33 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
static char password[100];
static int pos;
static char c;
c_write("password: ", 10);
static int pwpkt_type;
/*
* Show password prompt, having first obtained it via a TIS
* exchange if we're doing TIS authentication.
*/
pwpkt_type = SSH_CMSG_AUTH_PASSWORD;
if (pktin.type == SSH_SMSG_FAILURE &&
cfg.try_tis_auth &&
(supported_auths_mask & (1<<SSH_AUTH_TIS))) {
pwpkt_type = SSH_CMSG_AUTH_TIS_RESPONSE;
s_wrpkt_start(SSH_CMSG_AUTH_TIS, 0);
s_wrpkt();
do { crReturnV; } while (!ispkt);
if (pktin.type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
c_write("TIS authentication refused.\r\n", 29);
} else {
int challengelen = ((pktin.body[0] << 24) |
(pktin.body[1] << 16) |
(pktin.body[2] << 8) |
(pktin.body[3]));
c_write(pktin.body+4, challengelen);
}
}
if (pwpkt_type == SSH_CMSG_AUTH_PASSWORD)
c_write("password: ", 10);
pos = 0;
while (pos >= 0) {
do { crReturnV; } while (ispkt);
@ -471,7 +507,7 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
}
}
c_write("\r\n", 2);
s_wrpkt_start(SSH_CMSG_AUTH_PASSWORD, 4+strlen(password));
s_wrpkt_start(pwpkt_type, 4+strlen(password));
pktout.body[0] = pktout.body[1] = pktout.body[2] = 0;
pktout.body[3] = strlen(password);
memcpy(pktout.body+4, password, strlen(password));
@ -506,9 +542,9 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
s_wrpkt();
ssh_state = SSH_STATE_INTERMED;
do { crReturnV; } while (!ispkt);
if (pktin.type != SSH_MSG_SUCCESS && pktin.type != SSH_MSG_FAILURE) {
if (pktin.type != SSH_SMSG_SUCCESS && pktin.type != SSH_SMSG_FAILURE) {
fatalbox("Protocol confusion");
} else if (pktin.type == SSH_MSG_FAILURE) {
} else if (pktin.type == SSH_SMSG_FAILURE) {
c_write("Server refused to allocate pty\r\n", 32);
}
}
@ -531,9 +567,9 @@ static void ssh_protocol(unsigned char *in, int inlen, int ispkt) {
c_write(pktin.body+4, len);
} else if (pktin.type == SSH_MSG_DISCONNECT) {
ssh_state = SSH_STATE_CLOSED;
} else if (pktin.type == SSH_MSG_SUCCESS) {
} else if (pktin.type == SSH_SMSG_SUCCESS) {
/* may be from EXEC_SHELL on some servers */
} else if (pktin.type == SSH_MSG_FAILURE) {
} else if (pktin.type == SSH_SMSG_FAILURE) {
/* may be from EXEC_SHELL on some servers
* if no pty is available or in other odd cases. Ignore */
} else if (pktin.type == SSH_SMSG_EXITSTATUS) {