X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/caf3bc51964a9fa7b36aadbd11d35cecf665db21..ecdde3d8ca7e9973b300fdcad476578a167a5206:/auth-passwd.c diff --git a/auth-passwd.c b/auth-passwd.c index bebd6389..c849abdc 100644 --- a/auth-passwd.c +++ b/auth-passwd.c @@ -1,218 +1,206 @@ /* - -auth-passwd.c - -Author: Tatu Ylonen - -Copyright (c) 1995 Tatu Ylonen , 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 + * Copyright (c) 1995 Tatu Ylonen , 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("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 markus Exp $"); -#ifndef HAVE_PAM - -RCSID("$Id$"); +#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 +#ifdef WITH_AIXAUTHENTICATE +# include +#endif +#ifdef __hpux +# include +# include +#endif +#ifdef HAVE_SCO_PROTECTED_PW +# include +# include +# include +#endif /* HAVE_SCO_PROTECTED_PW */ +#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) +# include +#endif +#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) +# include +# include +# include +#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 +#include +#define is_winnt (GetVersion() < 0x80000000) #endif -#ifdef HAVE_MD5_PASSWORDS -#include "md5crypt.h" +/* + * Tries to authenticate the user using password. Returns true if + * authentication succeeds. + */ +int +auth_password(struct passwd * pw, const char *password) +{ + extern ServerOptions options; + 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 -/* Don't need anything from here if we are using PAM */ + /* 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; -/* Tries to authenticate the user using password. Returns true if - authentication succeeds. */ +#ifdef HAVE_CYGWIN + if (is_winnt) { + HANDLE hToken = cygwin_logon_user(pw, password); -int auth_password(struct passwd *pw, const char *password) -{ - extern ServerOptions options; - char *encrypted_password; -#ifdef HAVE_SHADOW_H - struct spwd *spw; + if (hToken == INVALID_HANDLE_VALUE) + return 0; + cygwin_set_impersonation_token(hToken); + return 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. */ - } +#ifdef WITH_AIXAUTHENTICATE + return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); #endif -#if defined(KRB4) - /* Support for Kerberos v4 authentication - Dug Song */ - 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; +#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. */ } - /* 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); - } - 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; - } - - /* 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. */ +#endif + + + 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(spw->sp_pwdp)) - encrypted_password = md5_crypt(password, spw->sp_pwdp); - else - encrypted_password = crypt(password, spw->sp_pwdp); -#else /* HAVE_MD5_PASSWORDS */ - encrypted_password = crypt(password, spw->sp_pwdp); -#endif /* HAVE_MD5_PASSWORDS */ - - /* 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 */ + 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 /* !HAVE_PAM */ +#endif /* !USE_PAM && !HAVE_OSF_SIA */