blob: ffd7032820351532d5c46aa1b56f362550ea360a [file] [log] [blame]
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
RCSID("$OpenBSD: auth2.c,v 1.92 2002/05/25 18:51:07 markus Exp $");
#include "ssh2.h"
#include "xmalloc.h"
#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "compat.h"
#include "auth.h"
#include "dispatch.h"
#include "pathnames.h"
#include "monitor_wrap.h"
/* import */
extern ServerOptions options;
extern u_char *session_id2;
extern int session_id2_len;
Authctxt *x_authctxt = NULL;
static int one = 1;
typedef struct Authmethod Authmethod;
struct Authmethod {
char *name;
int (*userauth)(Authctxt *authctxt);
int *enabled;
};
/* protocol */
static void input_service_request(int, u_int32_t, void *);
static void input_userauth_request(int, u_int32_t, void *);
/* helper */
static Authmethod *authmethod_lookup(const char *);
static char *authmethods_get(void);
int user_key_allowed(struct passwd *, Key *);
int hostbased_key_allowed(struct passwd *, const char *, char *, Key *);
/* auth */
Authmethod authmethods[] = {
{"none",
userauth_none,
&one},
{"publickey",
userauth_pubkey,
&options.pubkey_authentication},
{"password",
userauth_passwd,
&options.password_authentication},
{"keyboard-interactive",
userauth_kbdint,
&options.kbd_interactive_authentication},
{"hostbased",
userauth_hostbased,
&options.hostbased_authentication},
{NULL, NULL, NULL}
};
/*
* loop until authctxt->success == TRUE
*/
Authctxt *
do_authentication2(void)
{
Authctxt *authctxt = authctxt_new();
x_authctxt = authctxt; /*XXX*/
/* challenge-response is implemented via keyboard interactive */
if (options.challenge_response_authentication)
options.kbd_interactive_authentication = 1;
if (options.pam_authentication_via_kbd_int)
options.kbd_interactive_authentication = 1;
if (use_privsep)
options.pam_authentication_via_kbd_int = 0;
dispatch_init(&dispatch_protocol_error);
dispatch_set(SSH2_MSG_SERVICE_REQUEST, &input_service_request);
dispatch_run(DISPATCH_BLOCK, &authctxt->success, authctxt);
return (authctxt);
}
static void
input_service_request(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
u_int len;
int accept = 0;
char *service = packet_get_string(&len);
packet_check_eom();
if (authctxt == NULL)
fatal("input_service_request: no authctxt");
if (strcmp(service, "ssh-userauth") == 0) {
if (!authctxt->success) {
accept = 1;
/* now we can handle user-auth requests */
dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &input_userauth_request);
}
}
/* XXX all other service requests are denied */
if (accept) {
packet_start(SSH2_MSG_SERVICE_ACCEPT);
packet_put_cstring(service);
packet_send();
packet_write_wait();
} else {
debug("bad service request %s", service);
packet_disconnect("bad service request %s", service);
}
xfree(service);
}
static void
input_userauth_request(int type, u_int32_t seq, void *ctxt)
{
Authctxt *authctxt = ctxt;
Authmethod *m = NULL;
char *user, *service, *method, *style = NULL;
int authenticated = 0;
if (authctxt == NULL)
fatal("input_userauth_request: no authctxt");
user = packet_get_string(NULL);
service = packet_get_string(NULL);
method = packet_get_string(NULL);
debug("userauth-request for user %s service %s method %s", user, service, method);
debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);
if ((style = strchr(user, ':')) != NULL)
*style++ = 0;
if (authctxt->attempt++ == 0) {
/* setup auth context */
authctxt->pw = PRIVSEP(getpwnamallow(user));
if (authctxt->pw && strcmp(service, "ssh-connection")==0) {
authctxt->valid = 1;
debug2("input_userauth_request: setting up authctxt for %s", user);
#ifdef USE_PAM
PRIVSEP(start_pam(authctxt->pw->pw_name));
#endif
} else {
log("input_userauth_request: illegal user %s", user);
#ifdef USE_PAM
PRIVSEP(start_pam("NOUSER"));
#endif
}
setproctitle("%s%s", authctxt->pw ? user : "unknown",
use_privsep ? " [net]" : "");
authctxt->user = xstrdup(user);
authctxt->service = xstrdup(service);
authctxt->style = style ? xstrdup(style) : NULL;
if (use_privsep)
mm_inform_authserv(service, style);
} else if (strcmp(user, authctxt->user) != 0 ||
strcmp(service, authctxt->service) != 0) {
packet_disconnect("Change of username or service not allowed: "
"(%s,%s) -> (%s,%s)",
authctxt->user, authctxt->service, user, service);
}
/* reset state */
auth2_challenge_stop(authctxt);
authctxt->postponed = 0;
/* try to authenticate user */
m = authmethod_lookup(method);
if (m != NULL) {
debug2("input_userauth_request: try method %s", method);
authenticated = m->userauth(authctxt);
}
userauth_finish(authctxt, authenticated, method);
xfree(service);
xfree(user);
xfree(method);
}
void
userauth_finish(Authctxt *authctxt, int authenticated, char *method)
{
char *methods;
if (!authctxt->valid && authenticated)
fatal("INTERNAL ERROR: authenticated invalid user %s",
authctxt->user);
/* Special handling for root */
if (authenticated && authctxt->pw->pw_uid == 0 &&
!auth_root_allowed(method))
authenticated = 0;
#ifdef USE_PAM
if (!use_privsep && authenticated && authctxt->user &&
!do_pam_account(authctxt->user, NULL))
authenticated = 0;
#endif /* USE_PAM */
/* Log before sending the reply */
auth_log(authctxt, authenticated, method, " ssh2");
if (authctxt->postponed)
return;
/* XXX todo: check if multiple auth methods are needed */
if (authenticated == 1) {
/* turn off userauth */
dispatch_set(SSH2_MSG_USERAUTH_REQUEST, &dispatch_protocol_ignore);
packet_start(SSH2_MSG_USERAUTH_SUCCESS);
packet_send();
packet_write_wait();
/* now we can break out */
authctxt->success = 1;
} else {
if (authctxt->failures++ > AUTH_FAIL_MAX) {
#ifdef WITH_AIXAUTHENTICATE
loginfailed(authctxt->user,
get_canonical_hostname(options.verify_reverse_mapping),
"ssh");
#endif /* WITH_AIXAUTHENTICATE */
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
}
methods = authmethods_get();
packet_start(SSH2_MSG_USERAUTH_FAILURE);
packet_put_cstring(methods);
packet_put_char(0); /* XXX partial success, unused */
packet_send();
packet_write_wait();
xfree(methods);
}
}
char *
auth2_read_banner(void)
{
struct stat st;
char *banner = NULL;
off_t len, n;
int fd;
if ((fd = open(options.banner, O_RDONLY)) == -1)
return (NULL);
if (fstat(fd, &st) == -1) {
close(fd);
return (NULL);
}
len = st.st_size;
banner = xmalloc(len + 1);
n = atomicio(read, fd, banner, len);
close(fd);
if (n != len) {
free(banner);
return (NULL);
}
banner[n] = '\0';
return (banner);
}
static void
userauth_banner(void)
{
char *banner = NULL;
if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
return;
if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
goto done;
packet_start(SSH2_MSG_USERAUTH_BANNER);
packet_put_cstring(banner);
packet_put_cstring(""); /* language, unused */
packet_send();
debug("userauth_banner: sent");
done:
if (banner)
xfree(banner);
return;
}
static int
userauth_none(Authctxt *authctxt)
{
/* disable method "none", only allowed one time */
Authmethod *m = authmethod_lookup("none");
if (m != NULL)
m->enabled = NULL;
packet_check_eom();
userauth_banner();
if (authctxt->valid == 0)
return(0);
#ifdef HAVE_CYGWIN
if (check_nt_auth(1, authctxt->pw) == 0)
return(0);
#endif
return PRIVSEP(auth_password(authctxt, ""));
}
static int
userauth_passwd(Authctxt *authctxt)
{
char *password;
int authenticated = 0;
int change;
u_int len;
change = packet_get_char();
if (change)
log("password change not supported");
password = packet_get_string(&len);
packet_check_eom();
if (authctxt->valid &&
#ifdef HAVE_CYGWIN
check_nt_auth(1, authctxt->pw) &&
#endif
PRIVSEP(auth_password(authctxt, password)) == 1)
authenticated = 1;
memset(password, 0, len);
xfree(password);
return authenticated;
}
static int
userauth_kbdint(Authctxt *authctxt)
{
int authenticated = 0;
char *lang, *devs;
lang = packet_get_string(NULL);
devs = packet_get_string(NULL);
packet_check_eom();
debug("keyboard-interactive devs %s", devs);
if (options.challenge_response_authentication)
authenticated = auth2_challenge(authctxt, devs);
#ifdef USE_PAM
if (authenticated == 0 && options.pam_authentication_via_kbd_int)
authenticated = auth2_pam(authctxt);
#endif
xfree(devs);
xfree(lang);
#ifdef HAVE_CYGWIN
if (check_nt_auth(0, authctxt->pw) == 0)
return(0);
#endif
return authenticated;
}
static int
userauth_pubkey(Authctxt *authctxt)
{
Buffer b;
Key *key = NULL;
char *pkalg;
u_char *pkblob, *sig;
u_int alen, blen, slen;
int have_sig, pktype;
int authenticated = 0;
if (!authctxt->valid) {
debug2("userauth_pubkey: disabled because of invalid user");
return 0;
}
have_sig = packet_get_char();
if (datafellows & SSH_BUG_PKAUTH) {
debug2("userauth_pubkey: SSH_BUG_PKAUTH");
/* no explicit pkalg given */
pkblob = packet_get_string(&blen);
buffer_init(&b);
buffer_append(&b, pkblob, blen);
/* so we have to extract the pkalg from the pkblob */
pkalg = buffer_get_string(&b, &alen);
buffer_free(&b);
} else {
pkalg = packet_get_string(&alen);
pkblob = packet_get_string(&blen);
}
pktype = key_type_from_name(pkalg);
if (pktype == KEY_UNSPEC) {
/* this is perfectly legal */
log("userauth_pubkey: unsupported public key algorithm: %s",
pkalg);
goto done;
}
key = key_from_blob(pkblob, blen);
if (key == NULL) {
error("userauth_pubkey: cannot decode key: %s", pkalg);
goto done;
}
if (key->type != pktype) {
error("userauth_pubkey: type mismatch for decoded key "
"(received %d, expected %d)", key->type, pktype);
goto done;
}
if (have_sig) {
sig = packet_get_string(&slen);
packet_check_eom();
buffer_init(&b);
if (datafellows & SSH_OLD_SESSIONID) {
buffer_append(&b, session_id2, session_id2_len);
} else {
buffer_put_string(&b, session_id2, session_id2_len);
}
/* reconstruct packet */
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
buffer_put_cstring(&b, authctxt->user);
buffer_put_cstring(&b,
datafellows & SSH_BUG_PKSERVICE ?
"ssh-userauth" :
authctxt->service);
if (datafellows & SSH_BUG_PKAUTH) {
buffer_put_char(&b, have_sig);
} else {
buffer_put_cstring(&b, "publickey");
buffer_put_char(&b, have_sig);
buffer_put_cstring(&b, pkalg);
}
buffer_put_string(&b, pkblob, blen);
#ifdef DEBUG_PK
buffer_dump(&b);
#endif
/* test for correct signature */
authenticated = 0;
if (PRIVSEP(user_key_allowed(authctxt->pw, key)) &&
PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
buffer_len(&b))) == 1)
authenticated = 1;
buffer_clear(&b);
xfree(sig);
} else {
debug("test whether pkalg/pkblob are acceptable");
packet_check_eom();
/* XXX fake reply and always send PK_OK ? */
/*
* XXX this allows testing whether a user is allowed
* to login: if you happen to have a valid pubkey this
* message is sent. the message is NEVER sent at all
* if a user is not allowed to login. is this an
* issue? -markus
*/
if (PRIVSEP(user_key_allowed(authctxt->pw, key))) {
packet_start(SSH2_MSG_USERAUTH_PK_OK);
packet_put_string(pkalg, alen);
packet_put_string(pkblob, blen);
packet_send();
packet_write_wait();
authctxt->postponed = 1;
}
}
if (authenticated != 1)
auth_clear_options();
done:
debug2("userauth_pubkey: authenticated %d pkalg %s", authenticated, pkalg);
if (key != NULL)
key_free(key);
xfree(pkalg);
xfree(pkblob);
#ifdef HAVE_CYGWIN
if (check_nt_auth(0, authctxt->pw) == 0)
return(0);
#endif
return authenticated;
}
static int
userauth_hostbased(Authctxt *authctxt)
{
Buffer b;
Key *key = NULL;
char *pkalg, *cuser, *chost, *service;
u_char *pkblob, *sig;
u_int alen, blen, slen;
int pktype;
int authenticated = 0;
if (!authctxt->valid) {
debug2("userauth_hostbased: disabled because of invalid user");
return 0;
}
pkalg = packet_get_string(&alen);
pkblob = packet_get_string(&blen);
chost = packet_get_string(NULL);
cuser = packet_get_string(NULL);
sig = packet_get_string(&slen);
debug("userauth_hostbased: cuser %s chost %s pkalg %s slen %d",
cuser, chost, pkalg, slen);
#ifdef DEBUG_PK
debug("signature:");
buffer_init(&b);
buffer_append(&b, sig, slen);
buffer_dump(&b);
buffer_free(&b);
#endif
pktype = key_type_from_name(pkalg);
if (pktype == KEY_UNSPEC) {
/* this is perfectly legal */
log("userauth_hostbased: unsupported "
"public key algorithm: %s", pkalg);
goto done;
}
key = key_from_blob(pkblob, blen);
if (key == NULL) {
error("userauth_hostbased: cannot decode key: %s", pkalg);
goto done;
}
if (key->type != pktype) {
error("userauth_hostbased: type mismatch for decoded key "
"(received %d, expected %d)", key->type, pktype);
goto done;
}
service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
authctxt->service;
buffer_init(&b);
buffer_put_string(&b, session_id2, session_id2_len);
/* reconstruct packet */
buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
buffer_put_cstring(&b, authctxt->user);
buffer_put_cstring(&b, service);
buffer_put_cstring(&b, "hostbased");
buffer_put_string(&b, pkalg, alen);
buffer_put_string(&b, pkblob, blen);
buffer_put_cstring(&b, chost);
buffer_put_cstring(&b, cuser);
#ifdef DEBUG_PK
buffer_dump(&b);
#endif
/* test for allowed key and correct signature */
authenticated = 0;
if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
PRIVSEP(key_verify(key, sig, slen, buffer_ptr(&b),
buffer_len(&b))) == 1)
authenticated = 1;
buffer_clear(&b);
done:
debug2("userauth_hostbased: authenticated %d", authenticated);
if (key != NULL)
key_free(key);
xfree(pkalg);
xfree(pkblob);
xfree(cuser);
xfree(chost);
xfree(sig);
return authenticated;
}
/* get current user */
struct passwd*
auth_get_user(void)
{
return (x_authctxt != NULL && x_authctxt->valid) ? x_authctxt->pw : NULL;
}
#define DELIM ","
static char *
authmethods_get(void)
{
Authmethod *method = NULL;
Buffer b;
char *list;
buffer_init(&b);
for (method = authmethods; method->name != NULL; method++) {
if (strcmp(method->name, "none") == 0)
continue;
if (method->enabled != NULL && *(method->enabled) != 0) {
if (buffer_len(&b) > 0)
buffer_append(&b, ",", 1);
buffer_append(&b, method->name, strlen(method->name));
}
}
buffer_append(&b, "\0", 1);
list = xstrdup(buffer_ptr(&b));
buffer_free(&b);
return list;
}
static Authmethod *
authmethod_lookup(const char *name)
{
Authmethod *method = NULL;
if (name != NULL)
for (method = authmethods; method->name != NULL; method++)
if (method->enabled != NULL &&
*(method->enabled) != 0 &&
strcmp(name, method->name) == 0)
return method;
debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
return NULL;
}