X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/aa3378df3cc7da00b8f93569d0c88f0c626ddb18..e2b1fb42a45e8c82657b337e3039bec141e9c77f:/auth-passwd.c diff --git a/auth-passwd.c b/auth-passwd.c index edc9d7bc..d53a9ea2 100644 --- a/auth-passwd.c +++ b/auth-passwd.c @@ -2,213 +2,218 @@ * 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. + * + * 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 1.22 2001/03/20 18:57:04 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 "log.h" +#include "servconf.h" +#include "auth.h" -#ifdef HAVE_SHADOW_H -#include +#ifdef HAVE_CRYPT_H +# include #endif - -#ifdef HAVE_MD5_PASSWORDS -#include "md5crypt.h" +#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 + + +extern ServerOptions options; /* * Tries to authenticate the user using password. Returns true if * authentication succeeds. */ -int -auth_password(struct passwd * pw, const char *password) +int +auth_password(Authctxt *authctxt, const char *password) { - extern ServerOptions options; + struct passwd * pw = authctxt->pw; char *encrypted_password; -#ifdef HAVE_SHADOW_H + 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) + /* 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; - /* deny if no user. */ - if (pw == NULL) +#ifdef BSD_AUTH + if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", + (char *)password) == 0) return 0; + else + return 1; +#endif + +#ifdef HAVE_CYGWIN + if (is_winnt) { + HANDLE hToken = cygwin_logon_user(pw, password); -#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. */ + if (hToken == INVALID_HANDLE_VALUE) 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. */ + cygwin_set_impersonation_token(hToken); + return 1; } #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; - } - /* 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."); - } +#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. */ } -#endif /* KRB4 */ +#endif - /* Check for users with no password. */ - if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) - return 1; -#ifdef HAVE_SHADOW_H + 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) - return(0); + 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) */ - if ((spw->sp_namp == NULL) || (strcmp(pw->pw_name, spw->sp_namp) != 0)) - fatal("Shadow lookup returned garbage."); + /* Check for users with no password. */ + if ((password[0] == '\0') && (pw_password[0] == '\0')) + return 1; - if (strlen(spw->sp_pwdp) < 3) - return(0); + if (pw_password[0] != '\0') + salt = pw_password; + else + salt = "xx"; - /* Encrypt the candidate password using the proper salt. */ #ifdef HAVE_MD5_PASSWORDS - if (is_md5_salt(spw->sp_pwdp)) - encrypted_password = md5_crypt(password, spw->sp_pwdp); + if (is_md5_salt(salt)) + encrypted_password = md5_crypt(password, salt); 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 */ - encrypted_password = crypt(password, - (pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx"); + 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->pw_passwd) == 0); -#endif /* !HAVE_SHADOW_H */ + return (strcmp(encrypted_password, pw_password) == 0); } -#endif /* !HAVE_PAM */ +#endif /* !USE_PAM && !HAVE_OSF_SIA */