X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/d9891c59faf835d912219e158dbe2af813a25de4..HEAD:/auth-passwd.c diff --git a/auth-passwd.c b/auth-passwd.c index 896f1c26..b1c6ce09 100644 --- a/auth-passwd.c +++ b/auth-passwd.c @@ -1,3 +1,4 @@ +/* $OpenBSD: auth-passwd.c,v 1.43 2007/09/21 08:15:29 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -36,52 +37,42 @@ */ #include "includes.h" -RCSID("$OpenBSD: auth-passwd.c,v 1.25 2002/05/06 23:00:59 mouring Exp $"); + +#include + +#include +#include +#include +#include #include "packet.h" +#include "buffer.h" #include "log.h" #include "servconf.h" +#include "key.h" +#include "hostfile.h" #include "auth.h" +#include "auth-options.h" -#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) -/* Don't need any of these headers for the PAM or SIA cases */ -# ifdef HAVE_CRYPT_H -# include -# endif -# ifdef WITH_AIXAUTHENTICATE -# include -# endif -# ifdef __hpux -# include -# include -# endif -# ifdef HAVE_SECUREWARE -# include -# include -# include -# endif /* HAVE_SECUREWARE */ -# 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 -#endif /* !USE_PAM && !HAVE_OSF_SIA */ - +extern Buffer loginmsg; extern ServerOptions options; +#ifdef HAVE_LOGIN_CAP +extern login_cap_t *lc; +#endif + + +#define DAY (24L * 60 * 60) /* 1 day in seconds */ +#define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */ + +void +disable_forwarding(void) +{ + no_port_forwarding_flag = 1; + no_agent_forwarding_flag = 1; + no_x11_forwarding_flag = 1; +} + /* * Tries to authenticate the user using password. Returns true if * authentication succeeds. @@ -89,142 +80,135 @@ extern ServerOptions options; int auth_password(Authctxt *authctxt, const char *password) { -#if defined(USE_PAM) - if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) - return 0; - return auth_pam_password(authctxt, password); -#elif defined(HAVE_OSF_SIA) - if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) - return 0; - return auth_sia_password(authctxt, password); -#else struct passwd * pw = authctxt->pw; - char *encrypted_password; - char *pw_password; - char *salt; -#if defined(__hpux) || defined(HAVE_SECUREWARE) - struct pr_passwd *spw; -#endif /* __hpux || HAVE_SECUREWARE */ -#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; + int result, ok = authctxt->valid; +#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) + static int expire_checked = 0; #endif - /* 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) + if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) + ok = 0; #endif - if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) + if (*password == '\0' && options.permit_empty_passwd == 0) return 0; + #ifdef KRB5 if (options.kerberos_authentication == 1) { int ret = auth_krb5_password(authctxt, password); if (ret == 1 || ret == 0) - return ret; + return ret && ok; /* Fall back to ordinary passwd authentication. */ } #endif #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; + return ok; } #endif -#ifdef WITH_AIXAUTHENTICATE - return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); +#ifdef USE_PAM + if (options.use_pam) + return (sshpam_auth_passwd(authctxt, password) && ok); #endif -#ifdef KRB4 - if (options.kerberos_authentication == 1) { - int ret = auth_krb4_password(authctxt, password); - if (ret == 1 || ret == 0) - return ret; - /* Fall back to ordinary passwd authentication. */ +#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) + if (!expire_checked) { + expire_checked = 1; + if (auth_shadow_pwexpired(authctxt)) + authctxt->force_pwchange = 1; } #endif + result = sys_auth_passwd(authctxt, password); + if (authctxt->force_pwchange) + disable_forwarding(); + return (result && ok); +} + #ifdef BSD_AUTH - if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", - (char *)password) == 0) - return 0; - else - return 1; +static void +warn_expiry(Authctxt *authctxt, auth_session_t *as) +{ + char buf[256]; + quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime; + + pwwarntime = acwarntime = TWO_WEEKS; + + pwtimeleft = auth_check_change(as); + actimeleft = auth_check_expire(as); +#ifdef HAVE_LOGIN_CAP + if (authctxt->valid) { + pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS, + TWO_WEEKS); + acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS, + TWO_WEEKS); + } #endif - pw_password = pw->pw_passwd; + if (pwtimeleft != 0 && pwtimeleft < pwwarntime) { + daysleft = pwtimeleft / DAY + 1; + snprintf(buf, sizeof(buf), + "Your password will expire in %lld day%s.\n", + daysleft, daysleft == 1 ? "" : "s"); + buffer_append(&loginmsg, buf, strlen(buf)); + } + if (actimeleft != 0 && actimeleft < acwarntime) { + daysleft = actimeleft / DAY + 1; + snprintf(buf, sizeof(buf), + "Your account will expire in %lld day%s.\n", + daysleft, daysleft == 1 ? "" : "s"); + buffer_append(&loginmsg, buf, strlen(buf)); + } +} - /* - * 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) */ - -#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) */ - -#ifdef HAVE_SECUREWARE - if ((spw = getprpwnam(pw->pw_name)) != NULL) - pw_password = spw->ufld.fd_encrypt; -#endif /* HAVE_SECUREWARE */ - -#if defined(__hpux) && !defined(HAVE_SECUREWARE) - if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) - pw_password = spw->ufld.fd_encrypt; -#endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ +int +sys_auth_passwd(Authctxt *authctxt, const char *password) +{ + struct passwd *pw = authctxt->pw; + auth_session_t *as; + static int expire_checked = 0; + + as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh", + (char *)password); + if (as == NULL) + return (0); + if (auth_getstate(as) & AUTH_PWEXPIRED) { + auth_close(as); + disable_forwarding(); + authctxt->force_pwchange = 1; + return (1); + } else { + if (!expire_checked) { + expire_checked = 1; + warn_expiry(authctxt, as); + } + return (auth_close(as)); + } +} +#elif !defined(CUSTOM_SYS_AUTH_PASSWD) +int +sys_auth_passwd(Authctxt *authctxt, const char *password) +{ + struct passwd *pw = authctxt->pw; + char *encrypted_password; + + /* Just use the supplied fake password if authctxt is invalid */ + char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; /* 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 */ -# if defined(__hpux) && !defined(HAVE_SECUREWARE) - if (iscomsec()) - encrypted_password = bigcrypt(password, salt); - else - encrypted_password = crypt(password, salt); -# else -# ifdef HAVE_SECUREWARE - encrypted_password = bigcrypt(password, salt); -# else - encrypted_password = crypt(password, salt); -# endif /* HAVE_SECUREWARE */ -# endif /* __hpux && !defined(HAVE_SECUREWARE) */ -#endif /* HAVE_MD5_PASSWORDS */ - - /* Authentication is accepted if the encrypted passwords are identical. */ + if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) + return (1); + + /* Encrypt the candidate password using the proper salt. */ + encrypted_password = xcrypt(password, + (pw_password[0] && pw_password[1]) ? pw_password : "xx"); + + /* + * Authentication is accepted if the encrypted passwords + * are identical. + */ return (strcmp(encrypted_password, pw_password) == 0); -#endif /* !USE_PAM && !HAVE_OSF_SIA */ } +#endif