/*
-
-auth-passwd.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Sat Mar 18 05:11:38 1995 ylo
-
-Password authentication. This file contains the functions to check whether
-the password is valid for the user.
-
-*/
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Password authentication. This file contains the functions to check whether
+ * the password is valid for the user.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ * Copyright (c) 1999 Dug Song. All rights reserved.
+ * 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("$Id$");
+RCSID("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 markus Exp $");
+
+#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
#include "packet.h"
-#include "ssh.h"
-#include "servconf.h"
#include "xmalloc.h"
-#include "config.h"
+#include "log.h"
+#include "servconf.h"
+#include "auth.h"
-#ifdef HAVE_SHADOW_H
-#include <shadow.h>
+#ifdef WITH_AIXAUTHENTICATE
+# include <login.h>
+#endif
+#ifdef __hpux
+# include <hpsecurity.h>
+# include <prot.h>
+#endif
+#ifdef HAVE_SCO_PROTECTED_PW
+# include <sys/security.h>
+# include <sys/audit.h>
+# include <prot.h>
+#endif /* HAVE_SCO_PROTECTED_PW */
+#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
+# include <shadow.h>
+#endif
+#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
+# include <sys/label.h>
+# include <sys/audit.h>
+# include <pwdadj.h>
+#endif
+#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
+# include "md5crypt.h"
+#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
+
+#ifdef HAVE_CYGWIN
+#undef ERROR
+#include <windows.h>
+#include <sys/cygwin.h>
+#define is_winnt (GetVersion() < 0x80000000)
#endif
-#ifndef HAVE_PAM
-/* Don't need anything from here if we are using PAM */
-/* Tries to authenticate the user using password. Returns true if
- authentication succeeds. */
+extern ServerOptions options;
-int auth_password(struct passwd *pw, const char *password)
+/*
+ * Tries to authenticate the user using password. Returns true if
+ * authentication succeeds.
+ */
+int
+auth_password(Authctxt *authctxt, const char *password)
{
- extern ServerOptions options;
- char *encrypted_password;
-#ifdef HAVE_SHADOW_H
- struct spwd *spw;
+ struct passwd * pw = authctxt->pw;
+ char *encrypted_password;
+ char *pw_password;
+ char *salt;
+#ifdef __hpux
+ struct pr_passwd *spw;
+#endif
+#ifdef HAVE_SCO_PROTECTED_PW
+ struct pr_passwd *spw;
+#endif /* HAVE_SCO_PROTECTED_PW */
+#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
+ struct spwd *spw;
+#endif
+#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
+ struct passwd_adjunct *spw;
+#endif
+#ifdef WITH_AIXAUTHENTICATE
+ char *authmsg;
+ char *loginmsg;
+ int reenter = 1;
#endif
- if (pw->pw_uid == 0 && options.permit_root_login == 2)
- {
- /*packet_send_debug("Server does not permit root login with password.");*/
- return 0;
- }
-
- if (*password == '\0' && options.permit_empty_passwd == 0)
- {
- /*packet_send_debug("Server does not permit empty password login.");*/
- return 0;
- }
-
- /* deny if no user. */
- if (pw == NULL)
- return 0;
-
-#ifdef SKEY
- if (options.skey_authentication == 1) {
- if (strncasecmp(password, "s/key", 5) == 0) {
- char *skeyinfo = skey_keyinfo(pw->pw_name);
- if(skeyinfo == NULL){
- debug("generating fake skeyinfo for %.100s.", pw->pw_name);
- skeyinfo = skey_fake_keyinfo(pw->pw_name);
- }
- if(skeyinfo != NULL)
- packet_send_debug(skeyinfo);
- /* Try again. */
- return 0;
- }
- else if (skey_haskey(pw->pw_name) == 0 &&
- skey_passcheck(pw->pw_name, (char *)password) != -1) {
- /* Authentication succeeded. */
- return 1;
- }
- /* Fall back to ordinary passwd authentication. */
- }
+ /* deny if no user. */
+ if (pw == NULL)
+ return 0;
+#ifndef HAVE_CYGWIN
+ if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
+ return 0;
+#endif
+#ifdef HAVE_CYGWIN
+ /*
+ * Empty password is only possible on NT if the user has _really_
+ * an empty password and authentication is done, though.
+ */
+ if (!is_winnt)
+#endif
+ if (*password == '\0' && options.permit_empty_passwd == 0)
+ return 0;
+#ifdef BSD_AUTH
+ if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
+ (char *)password) == 0)
+ return 0;
+ else
+ return 1;
#endif
-#if defined(KRB4)
- /* Support for Kerberos v4 authentication - Dug Song <dugsong@UMICH.EDU> */
- if (options.kerberos_authentication)
- {
- AUTH_DAT adata;
- KTEXT_ST tkt;
- struct hostent *hp;
- unsigned long faddr;
- char localhost[MAXHOSTNAMELEN];
- char phost[INST_SZ];
- char realm[REALM_SZ];
- int r;
-
- /* Try Kerberos password authentication only for non-root
- users and only if Kerberos is installed. */
- if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) {
-
- /* Set up our ticket file. */
- if (!krb4_init(pw->pw_uid)) {
- log("Couldn't initialize Kerberos ticket file for %s!", pw->pw_name);
- goto kerberos_auth_failure;
- }
- /* Try to get TGT using our password. */
- r = krb_get_pw_in_tkt((char *)pw->pw_name, "", realm, "krbtgt", realm,
- DEFAULT_TKT_LIFE, (char *)password);
- if (r != INTK_OK) {
- packet_send_debug("Kerberos V4 password authentication for %s "
- "failed: %s", pw->pw_name, krb_err_txt[r]);
- goto kerberos_auth_failure;
- }
- /* Successful authentication. */
- chown(tkt_string(), pw->pw_uid, pw->pw_gid);
-
- /* Now that we have a TGT, try to get a local "rcmd" ticket to
- ensure that we are not talking to a bogus Kerberos server. */
- (void) gethostname(localhost, sizeof(localhost));
- (void) strlcpy(phost, (char *)krb_get_phost(localhost), INST_SZ);
- r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33);
-
- if (r == KSUCCESS) {
- if (!(hp = gethostbyname(localhost))) {
- log("Couldn't get local host address!");
- goto kerberos_auth_failure;
- }
- memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr));
-
- /* Verify our "rcmd" ticket. */
- r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost, faddr, &adata, "");
- if (r == RD_AP_UNDEC) {
- /* Probably didn't have a srvtab on localhost. Allow login. */
- log("Kerberos V4 TGT for %s unverifiable, no srvtab installed? "
- "krb_rd_req: %s", pw->pw_name, krb_err_txt[r]);
- }
- else if (r != KSUCCESS) {
- log("Kerberos V4 %s ticket unverifiable: %s",
- KRB4_SERVICE_NAME, krb_err_txt[r]);
- goto kerberos_auth_failure;
- }
- }
- else if (r == KDC_PR_UNKNOWN) {
- /* Allow login if no rcmd service exists, but log the error. */
- log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s "
- "not registered, or srvtab is wrong?", pw->pw_name,
- krb_err_txt[r], KRB4_SERVICE_NAME, phost);
+#ifdef HAVE_CYGWIN
+ if (is_winnt) {
+ HANDLE hToken = cygwin_logon_user(pw, password);
+
+ if (hToken == INVALID_HANDLE_VALUE)
+ return 0;
+ cygwin_set_impersonation_token(hToken);
+ return 1;
}
- else {
- /* TGT is bad, forget it. Possibly spoofed! */
- packet_send_debug("WARNING: Kerberos V4 TGT possibly spoofed for"
- "%s: %s", pw->pw_name, krb_err_txt[r]);
- goto kerberos_auth_failure;
+#endif
+
+#ifdef WITH_AIXAUTHENTICATE
+ return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
+#endif
+
+#ifdef KRB4
+ if (options.kerberos_authentication == 1) {
+ int ret = auth_krb4_password(pw, password);
+ if (ret == 1 || ret == 0)
+ return ret;
+ /* Fall back to ordinary passwd authentication. */
}
-
- /* Authentication succeeded. */
- return 1;
-
- kerberos_auth_failure:
- krb4_cleanup_proc(NULL);
-
- if (!options.kerberos_or_local_passwd)
- return 0;
- }
- else {
- /* Logging in as root or no local Kerberos realm. */
- packet_send_debug("Unable to authenticate to Kerberos.");
- }
- /* Fall back to ordinary passwd authentication. */
- }
-#endif /* KRB4 */
-
- /* Check for users with no password. */
- if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
- {
- packet_send_debug("Login permitted without a password because the account has no password.");
- return 1; /* The user has no password and an empty password was tried. */
- }
-
-#ifdef HAVE_SHADOW_H
- spw = getspnam(pw->pw_name);
- if (spw == NULL)
- return(0);
-
- if ((spw->sp_namp == NULL) || (strcmp(pw->pw_name, spw->sp_namp) != 0))
- fatal("Shadow lookup returned garbage.");
-
- if (strlen(spw->sp_pwdp) < 3)
- return(0);
-
- /* Encrypt the candidate password using the proper salt. */
- encrypted_password = crypt(password, spw->sp_pwdp);
-
- /* Authentication is accepted if the encrypted passwords are identical. */
- return (strcmp(encrypted_password, spw->sp_pwdp) == 0);
-#else /* !HAVE_SHADOW_H */
-
- /* Encrypt the candidate password using the proper salt. */
- encrypted_password = crypt(password,
- (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
- pw->pw_passwd : "xx");
- /* Authentication is accepted if the encrypted passwords are identical. */
- return (strcmp(encrypted_password, pw->pw_passwd) == 0);
-#endif /* !HAVE_SHADOW_H */
-}
+#endif
+
-#endif /* !HAVE_PAM */
+ pw_password = pw->pw_passwd;
+
+ /*
+ * Various interfaces to shadow or protected password data
+ */
+#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
+ spw = getspnam(pw->pw_name);
+ if (spw != NULL)
+ pw_password = spw->sp_pwdp;
+#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
+
+#ifdef HAVE_SCO_PROTECTED_PW
+ spw = getprpwnam(pw->pw_name);
+ if (spw != NULL)
+ pw_password = spw->ufld.fd_encrypt;
+#endif /* HAVE_SCO_PROTECTED_PW */
+
+#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
+ if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
+ pw_password = spw->pwa_passwd;
+#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
+
+#if defined(__hpux)
+ if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
+ pw_password = spw->ufld.fd_encrypt;
+#endif /* defined(__hpux) */
+
+ /* Check for users with no password. */
+ if ((password[0] == '\0') && (pw_password[0] == '\0'))
+ return 1;
+
+ if (pw_password[0] != '\0')
+ salt = pw_password;
+ else
+ salt = "xx";
+
+#ifdef HAVE_MD5_PASSWORDS
+ if (is_md5_salt(salt))
+ encrypted_password = md5_crypt(password, salt);
+ else
+ encrypted_password = crypt(password, salt);
+#else /* HAVE_MD5_PASSWORDS */
+# ifdef __hpux
+ if (iscomsec())
+ encrypted_password = bigcrypt(password, salt);
+ else
+ encrypted_password = crypt(password, salt);
+# else
+ encrypted_password = crypt(password, salt);
+# endif /* __hpux */
+#endif /* HAVE_MD5_PASSWORDS */
+
+ /* Authentication is accepted if the encrypted passwords are identical. */
+ return (strcmp(encrypted_password, pw_password) == 0);
+}
+#endif /* !USE_PAM && !HAVE_OSF_SIA */
andersk / openssh.git / blobdiff