version 1.2.2.4, 2001/05/07 21:09:26 |
version 1.2.2.5, 2001/09/27 00:15:41 |
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/* |
/* |
* Copyright (c) 2001 Markus Friedl. All rights reserved. |
* Copyright (c) 2001 Markus Friedl. All rights reserved. |
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* Copyright (c) 2001 Per Allansson. All rights reserved. |
* |
* |
* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* modification, are permitted provided that the following conditions |
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#include "packet.h" |
#include "packet.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "dispatch.h" |
#include "dispatch.h" |
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#include "auth.h" |
#include "log.h" |
#include "log.h" |
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void send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo); |
static int auth2_challenge_start(Authctxt *); |
void input_userauth_info_response(int type, int plen, void *ctxt); |
static int send_userauth_info_request(Authctxt *); |
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static void input_userauth_info_response(int, int, void *); |
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#ifdef BSD_AUTH |
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extern KbdintDevice bsdauth_device; |
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#else |
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#ifdef SKEY |
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extern KbdintDevice skey_device; |
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#endif |
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#endif |
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KbdintDevice *devices[] = { |
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#ifdef BSD_AUTH |
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&bsdauth_device, |
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#else |
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#ifdef SKEY |
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&skey_device, |
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#endif |
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#endif |
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NULL |
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}; |
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typedef struct KbdintAuthctxt KbdintAuthctxt; |
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struct KbdintAuthctxt |
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{ |
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char *devices; |
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void *ctxt; |
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KbdintDevice *device; |
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}; |
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static KbdintAuthctxt * |
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kbdint_alloc(const char *devs) |
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{ |
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KbdintAuthctxt *kbdintctxt; |
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int i; |
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char buf[1024]; |
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kbdintctxt = xmalloc(sizeof(KbdintAuthctxt)); |
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if (strcmp(devs, "") == 0) { |
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buf[0] = '\0'; |
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for (i = 0; devices[i]; i++) { |
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if (i != 0) |
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strlcat(buf, ",", sizeof(buf)); |
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strlcat(buf, devices[i]->name, sizeof(buf)); |
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} |
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debug("kbdint_alloc: devices '%s'", buf); |
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kbdintctxt->devices = xstrdup(buf); |
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} else { |
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kbdintctxt->devices = xstrdup(devs); |
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} |
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kbdintctxt->ctxt = NULL; |
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kbdintctxt->device = NULL; |
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return kbdintctxt; |
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} |
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static void |
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kbdint_reset_device(KbdintAuthctxt *kbdintctxt) |
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{ |
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if (kbdintctxt->ctxt) { |
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kbdintctxt->device->free_ctx(kbdintctxt->ctxt); |
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kbdintctxt->ctxt = NULL; |
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} |
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kbdintctxt->device = NULL; |
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} |
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static void |
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kbdint_free(KbdintAuthctxt *kbdintctxt) |
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{ |
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if (kbdintctxt->device) |
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kbdint_reset_device(kbdintctxt); |
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if (kbdintctxt->devices) { |
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xfree(kbdintctxt->devices); |
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kbdintctxt->devices = NULL; |
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} |
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xfree(kbdintctxt); |
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} |
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/* get next device */ |
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static int |
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kbdint_next_device(KbdintAuthctxt *kbdintctxt) |
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{ |
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size_t len; |
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char *t; |
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int i; |
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if (kbdintctxt->device) |
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kbdint_reset_device(kbdintctxt); |
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do { |
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len = kbdintctxt->devices ? |
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strcspn(kbdintctxt->devices, ",") : 0; |
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if (len == 0) |
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break; |
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for (i = 0; devices[i]; i++) |
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if (strncmp(kbdintctxt->devices, devices[i]->name, len) == 0) |
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kbdintctxt->device = devices[i]; |
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t = kbdintctxt->devices; |
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kbdintctxt->devices = t[len] ? xstrdup(t+len+1) : NULL; |
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xfree(t); |
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debug2("kbdint_next_device: devices %s", kbdintctxt->devices ? |
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kbdintctxt->devices : "<empty>"); |
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} while (kbdintctxt->devices && !kbdintctxt->device); |
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return kbdintctxt->device ? 1 : 0; |
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} |
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/* |
/* |
* try challenge-reponse, return -1 (= postponed) if we have to |
* try challenge-reponse, set authctxt->postponed if we have to |
* wait for the response. |
* wait for the response. |
*/ |
*/ |
int |
int |
auth2_challenge(Authctxt *authctxt, char *devs) |
auth2_challenge(Authctxt *authctxt, char *devs) |
{ |
{ |
char *challenge; |
debug("auth2_challenge: user=%s devs=%s", |
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authctxt->user ? authctxt->user : "<nouser>", |
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devs ? devs : "<no devs>"); |
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if (!authctxt->valid || authctxt->user == NULL) |
if (authctxt->user == NULL || !devs) |
return 0; |
return 0; |
if ((challenge = get_challenge(authctxt, devs)) == NULL) |
if (authctxt->kbdintctxt == NULL) |
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authctxt->kbdintctxt = kbdint_alloc(devs); |
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return auth2_challenge_start(authctxt); |
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} |
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/* side effect: sets authctxt->postponed if a reply was sent*/ |
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static int |
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auth2_challenge_start(Authctxt *authctxt) |
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{ |
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KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt; |
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debug2("auth2_challenge_start: devices %s", |
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kbdintctxt->devices ? kbdintctxt->devices : "<empty>"); |
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if (kbdint_next_device(kbdintctxt) == 0) { |
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kbdint_free(kbdintctxt); |
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authctxt->kbdintctxt = NULL; |
return 0; |
return 0; |
send_userauth_into_request(authctxt, challenge, 0); |
} |
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debug("auth2_challenge_start: trying authentication method '%s'", |
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kbdintctxt->device->name); |
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if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) { |
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kbdint_free(kbdintctxt); |
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authctxt->kbdintctxt = NULL; |
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return 0; |
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} |
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if (send_userauth_info_request(authctxt) == 0) { |
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kbdint_free(kbdintctxt); |
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authctxt->kbdintctxt = NULL; |
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return 0; |
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} |
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, |
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, |
&input_userauth_info_response); |
&input_userauth_info_response); |
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authctxt->postponed = 1; |
authctxt->postponed = 1; |
return 0; |
return 0; |
} |
} |
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void |
static int |
send_userauth_into_request(Authctxt *authctxt, char *challenge, int echo) |
send_userauth_info_request(Authctxt *authctxt) |
{ |
{ |
int nprompts = 1; |
KbdintAuthctxt *kbdintctxt; |
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char *name, *instr, **prompts; |
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int i; |
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u_int numprompts, *echo_on; |
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kbdintctxt = authctxt->kbdintctxt; |
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if (kbdintctxt->device->query(kbdintctxt->ctxt, |
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&name, &instr, &numprompts, &prompts, &echo_on)) |
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return 0; |
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packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST); |
packet_start(SSH2_MSG_USERAUTH_INFO_REQUEST); |
/* name, instruction and language are unused */ |
packet_put_cstring(name); |
packet_put_cstring(""); |
packet_put_cstring(instr); |
packet_put_cstring(""); |
packet_put_cstring(""); /* language not used */ |
packet_put_cstring(""); |
packet_put_int(numprompts); |
packet_put_int(nprompts); |
for (i = 0; i < numprompts; i++) { |
packet_put_cstring(challenge); |
packet_put_cstring(prompts[i]); |
packet_put_char(echo); |
packet_put_char(echo_on[i]); |
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} |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
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for (i = 0; i < numprompts; i++) |
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xfree(prompts[i]); |
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xfree(prompts); |
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xfree(echo_on); |
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xfree(name); |
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xfree(instr); |
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return 1; |
} |
} |
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void |
static void |
input_userauth_info_response(int type, int plen, void *ctxt) |
input_userauth_info_response(int type, int plen, void *ctxt) |
{ |
{ |
Authctxt *authctxt = ctxt; |
Authctxt *authctxt = ctxt; |
int authenticated = 0; |
KbdintAuthctxt *kbdintctxt; |
u_int nresp, rlen; |
int i, authenticated = 0, res, len; |
char *response, *method = "challenge-reponse"; |
u_int nresp; |
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char **response = NULL, *method; |
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if (authctxt == NULL) |
if (authctxt == NULL) |
fatal("input_userauth_info_response: no authctxt"); |
fatal("input_userauth_info_response: no authctxt"); |
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kbdintctxt = authctxt->kbdintctxt; |
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if (kbdintctxt == NULL || kbdintctxt->ctxt == NULL) |
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fatal("input_userauth_info_response: no kbdintctxt"); |
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if (kbdintctxt->device == NULL) |
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fatal("input_userauth_info_response: no device"); |
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authctxt->postponed = 0; /* reset */ |
authctxt->postponed = 0; /* reset */ |
nresp = packet_get_int(); |
nresp = packet_get_int(); |
if (nresp == 1) { |
if (nresp > 0) { |
response = packet_get_string(&rlen); |
response = xmalloc(nresp * sizeof(char*)); |
packet_done(); |
for (i = 0; i < nresp; i++) |
if (strlen(response) == 0) { |
response[i] = packet_get_string(NULL); |
/* |
} |
* if we received an empty response, resend challenge |
packet_done(); |
* with echo enabled |
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*/ |
if (authctxt->valid) { |
char *challenge = get_challenge(authctxt, NULL); |
res = kbdintctxt->device->respond(kbdintctxt->ctxt, |
if (challenge != NULL) { |
nresp, response); |
send_userauth_into_request(authctxt, |
} else { |
challenge, 1); |
res = -1; |
authctxt->postponed = 1; |
} |
} |
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} else if (authctxt->valid) { |
for (i = 0; i < nresp; i++) { |
authenticated = verify_response(authctxt, response); |
memset(response[i], 'r', strlen(response[i])); |
memset(response, 'r', rlen); |
xfree(response[i]); |
} |
} |
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if (response) |
xfree(response); |
xfree(response); |
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switch (res) { |
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case 0: |
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/* Success! */ |
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authenticated = 1; |
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break; |
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case 1: |
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/* Authentication needs further interaction */ |
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authctxt->postponed = 1; |
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if (send_userauth_info_request(authctxt) == 0) { |
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authctxt->postponed = 0; |
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} |
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break; |
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default: |
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/* Failure! */ |
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break; |
} |
} |
/* unregister callback */ |
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if (!authctxt->postponed) |
len = strlen("keyboard-interactive") + 2 + |
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strlen(kbdintctxt->device->name); |
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method = xmalloc(len); |
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method[0] = '\0'; |
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strlcat(method, "keyboard-interactive", len); |
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strlcat(method, "/", len); |
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strlcat(method, kbdintctxt->device->name, len); |
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if (!authctxt->postponed) { |
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/* unregister callback */ |
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL); |
dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE, NULL); |
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if (authenticated) { |
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kbdint_free(kbdintctxt); |
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authctxt->kbdintctxt = NULL; |
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} else { |
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/* start next device */ |
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/* may set authctxt->postponed */ |
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auth2_challenge_start(authctxt); |
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} |
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} |
userauth_finish(authctxt, authenticated, method); |
userauth_finish(authctxt, authenticated, method); |
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xfree(method); |
} |
} |