version 1.6.2.5, 2001/05/07 21:09:26 |
version 1.6.2.6, 2001/09/27 00:15:41 |
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#include "auth.h" |
#include "auth.h" |
#include "session.h" |
#include "session.h" |
#include "misc.h" |
#include "misc.h" |
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#include "uidswap.h" |
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/* import */ |
/* import */ |
extern ServerOptions options; |
extern ServerOptions options; |
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/* |
/* |
* convert ssh auth msg type into description |
* convert ssh auth msg type into description |
*/ |
*/ |
char * |
static char * |
get_authname(int type) |
get_authname(int type) |
{ |
{ |
static char buf[1024]; |
static char buf[1024]; |
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case SSH_CMSG_AUTH_TIS: |
case SSH_CMSG_AUTH_TIS: |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
return "challenge-response"; |
return "challenge-response"; |
#ifdef KRB4 |
#if defined(KRB4) || defined(KRB5) |
case SSH_CMSG_AUTH_KERBEROS: |
case SSH_CMSG_AUTH_KERBEROS: |
return "kerberos"; |
return "kerberos"; |
#endif |
#endif |
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* read packets, try to authenticate the user and |
* read packets, try to authenticate the user and |
* return only if authentication is successful |
* return only if authentication is successful |
*/ |
*/ |
void |
static void |
do_authloop(Authctxt *authctxt) |
do_authloop(Authctxt *authctxt) |
{ |
{ |
int authenticated = 0; |
int authenticated = 0; |
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/* If the user has no password, accept authentication immediately. */ |
/* If the user has no password, accept authentication immediately. */ |
if (options.password_authentication && |
if (options.password_authentication && |
#ifdef KRB4 |
#if defined(KRB4) || defined(KRB5) |
(!options.kerberos_authentication || options.kerberos_or_local_passwd) && |
(!options.kerberos_authentication || options.kerberos_or_local_passwd) && |
#endif |
#endif |
auth_password(authctxt, "")) { |
auth_password(authctxt, "")) { |
auth_log(authctxt, 1, "without authentication", ""); |
auth_log(authctxt, 1, "without authentication", ""); |
return; |
return; |
} |
} |
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/* Indicate that authentication is needed. */ |
/* Indicate that authentication is needed. */ |
packet_start(SSH_SMSG_FAILURE); |
packet_start(SSH_SMSG_FAILURE); |
packet_send(); |
packet_send(); |
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/* Process the packet. */ |
/* Process the packet. */ |
switch (type) { |
switch (type) { |
#ifdef AFS |
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case SSH_CMSG_HAVE_KERBEROS_TGT: |
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if (!options.kerberos_tgt_passing) { |
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verbose("Kerberos tgt passing disabled."); |
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break; |
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} else { |
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/* Accept Kerberos tgt. */ |
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char *tgt = packet_get_string(&dlen); |
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packet_integrity_check(plen, 4 + dlen, type); |
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if (!auth_kerberos_tgt(pw, tgt)) |
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verbose("Kerberos tgt REFUSED for %.100s", authctxt->user); |
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xfree(tgt); |
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} |
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continue; |
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case SSH_CMSG_HAVE_AFS_TOKEN: |
#if defined(KRB4) || defined(KRB5) |
if (!options.afs_token_passing || !k_hasafs()) { |
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verbose("AFS token passing disabled."); |
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break; |
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} else { |
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/* Accept AFS token. */ |
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char *token_string = packet_get_string(&dlen); |
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packet_integrity_check(plen, 4 + dlen, type); |
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if (!auth_afs_token(pw, token_string)) |
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verbose("AFS token REFUSED for %.100s", authctxt->user); |
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xfree(token_string); |
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} |
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continue; |
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#endif /* AFS */ |
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#ifdef KRB4 |
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case SSH_CMSG_AUTH_KERBEROS: |
case SSH_CMSG_AUTH_KERBEROS: |
if (!options.kerberos_authentication) { |
if (!options.kerberos_authentication) { |
verbose("Kerberos authentication disabled."); |
verbose("Kerberos authentication disabled."); |
break; |
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} else { |
} else { |
/* Try Kerberos v4 authentication. */ |
char *kdata = packet_get_string(&dlen); |
KTEXT_ST auth; |
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char *tkt_user = NULL; |
packet_integrity_check(plen, 4 + dlen, type); |
char *kdata = packet_get_string((u_int *) &auth.length); |
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packet_integrity_check(plen, 4 + auth.length, type); |
if (kdata[0] == 4) { /* KRB_PROT_VERSION */ |
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#ifdef KRB4 |
if (authctxt->valid) { |
KTEXT_ST tkt; |
if (auth.length < MAX_KTXT_LEN) |
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memcpy(auth.dat, kdata, auth.length); |
tkt.length = dlen; |
authenticated = auth_krb4(pw->pw_name, &auth, &tkt_user); |
if (tkt.length < MAX_KTXT_LEN) |
if (authenticated) { |
memcpy(tkt.dat, kdata, tkt.length); |
snprintf(info, sizeof info, |
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" tktuser %.100s", tkt_user); |
if (auth_krb4(authctxt, &tkt, &client_user)) { |
xfree(tkt_user); |
authenticated = 1; |
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snprintf(info, sizeof(info), |
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" tktuser %.100s", |
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client_user); |
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xfree(client_user); |
} |
} |
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#endif /* KRB4 */ |
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} else { |
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#ifdef KRB5 |
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krb5_data tkt; |
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tkt.length = dlen; |
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tkt.data = kdata; |
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if (auth_krb5(authctxt, &tkt, &client_user)) { |
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authenticated = 1; |
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snprintf(info, sizeof(info), |
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" tktuser %.100s", |
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client_user); |
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xfree(client_user); |
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} |
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#endif /* KRB5 */ |
} |
} |
xfree(kdata); |
xfree(kdata); |
} |
} |
break; |
break; |
#endif /* KRB4 */ |
#endif /* KRB4 || KRB5 */ |
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#if defined(AFS) || defined(KRB5) |
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/* XXX - punt on backward compatibility here. */ |
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case SSH_CMSG_HAVE_KERBEROS_TGT: |
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packet_send_debug("Kerberos TGT passing disabled before authentication."); |
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break; |
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#ifdef AFS |
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case SSH_CMSG_HAVE_AFS_TOKEN: |
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packet_send_debug("AFS token passing disabled before authentication."); |
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break; |
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#endif /* AFS */ |
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#endif /* AFS || KRB5 */ |
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case SSH_CMSG_AUTH_RHOSTS: |
case SSH_CMSG_AUTH_RHOSTS: |
if (!options.rhosts_authentication) { |
if (!options.rhosts_authentication) { |
verbose("Rhosts authentication disabled."); |
verbose("Rhosts authentication disabled."); |
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case SSH_CMSG_AUTH_TIS: |
case SSH_CMSG_AUTH_TIS: |
debug("rcvd SSH_CMSG_AUTH_TIS"); |
debug("rcvd SSH_CMSG_AUTH_TIS"); |
if (options.challenge_reponse_authentication == 1) { |
if (options.challenge_response_authentication == 1) { |
char *challenge = get_challenge(authctxt, authctxt->style); |
char *challenge = get_challenge(authctxt); |
if (challenge != NULL) { |
if (challenge != NULL) { |
debug("sending challenge '%s'", challenge); |
debug("sending challenge '%s'", challenge); |
packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE); |
packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE); |
packet_put_cstring(challenge); |
packet_put_cstring(challenge); |
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xfree(challenge); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
continue; |
continue; |
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break; |
break; |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE"); |
debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE"); |
if (options.challenge_reponse_authentication == 1) { |
if (options.challenge_response_authentication == 1) { |
char *response = packet_get_string(&dlen); |
char *response = packet_get_string(&dlen); |
debug("got response '%s'", response); |
debug("got response '%s'", response); |
packet_integrity_check(plen, 4 + dlen, type); |
packet_integrity_check(plen, 4 + dlen, type); |
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struct passwd *pw; |
struct passwd *pw; |
int plen; |
int plen; |
u_int ulen; |
u_int ulen; |
char *user, *style = NULL; |
char *p, *user, *style = NULL; |
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/* Get the name of the user that we wish to log in as. */ |
/* Get the name of the user that we wish to log in as. */ |
packet_read_expect(&plen, SSH_CMSG_USER); |
packet_read_expect(&plen, SSH_CMSG_USER); |
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packet_integrity_check(plen, (4 + ulen), SSH_CMSG_USER); |
packet_integrity_check(plen, (4 + ulen), SSH_CMSG_USER); |
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if ((style = strchr(user, ':')) != NULL) |
if ((style = strchr(user, ':')) != NULL) |
*style++ = 0; |
*style++ = '\0'; |
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/* XXX - SSH.com Kerberos v5 braindeath. */ |
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if ((p = strchr(user, '@')) != NULL) |
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*p = '\0'; |
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authctxt = authctxt_new(); |
authctxt = authctxt_new(); |
authctxt->user = user; |
authctxt->user = user; |
authctxt->style = style; |
authctxt->style = style; |