/*
+ * 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.
+ */
-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.
+#include "includes.h"
-*/
+#ifndef USE_PAM
-#include "includes.h"
RCSID("$Id$");
#include "packet.h"
#include "servconf.h"
#include "xmalloc.h"
-#ifdef KRB4
-extern char *ticket;
-#endif /* KRB4 */
-
-#ifdef HAVE_PAM
-#include <security/pam_appl.h>
-extern pam_handle_t *pamh;
-extern int retval;
-extern char* pampasswd;
-extern int origretval;
-#endif /* HAVE_PAM */
-
-/* Tries to authenticate the user using password. Returns true if
- authentication succeeds. */
+#ifdef HAVE_SHADOW_H
+# include <shadow.h>
+#endif
+#if defined(HAVE_CRYPT_H) && !defined(CRYPT_H_BREAKS_BUILD)
+# include <crypt.h>
+#endif /* defined(HAVE_CRYPT_H) && !defined(CRYPT_H_BREAKS_BUILD) */
+#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
+# include "md5crypt.h"
+#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
-int auth_password(struct passwd *pw, const char *password)
+/*
+ * 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;
-
- 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 HAVE_PAM
- retval = origretval;
-
- pampasswd = xstrdup(password);
-
- if (retval == PAM_SUCCESS)
- retval = pam_authenticate ((pam_handle_t *)pamh, 0);
-
- if (retval == PAM_SUCCESS)
- retval = pam_acct_mgmt ((pam_handle_t *)pamh, 0);
-
- xfree(pampasswd);
-
- if (retval == PAM_SUCCESS)
- retval = pam_open_session ((pam_handle_t *)pamh, 0);
-
- return (retval == PAM_SUCCESS);
-
-#else /* HAVE_PAM */
-
-#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. */
- }
+ extern ServerOptions options;
+ char *encrypted_password;
+ char *pw_password;
+ char *salt;
+#ifdef HAVE_SHADOW_H
+ struct spwd *spw;
#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]; /* local host name */
- char phost[INST_SZ]; /* host instance */
- char realm[REALM_SZ]; /* local Kerberos realm */
- 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) {
+ /* deny if no user. */
+ if (pw == NULL)
+ return 0;
+ if (pw->pw_uid == 0 && options.permit_root_login == 2)
+ return 0;
+ if (*password == '\0' && options.permit_empty_passwd == 0)
+ return 0;
- /* Set up our ticket file. */
- if (!ssh_tf_init(pw->pw_uid)) {
- log("Couldn't initialize Kerberos ticket file for %s!",
- pw->pw_name);
- goto kerberos_auth_failure;
+#ifdef SKEY
+ if (options.skey_authentication == 1) {
+ int ret = auth_skey_password(pw, password);
+ if (ret == 1 || ret == 0)
+ return ret;
+ /* Fall back to ordinary passwd authentication. */
}
- /* 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;
+#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. */
}
- /* Successful authentication. */
- chown(ticket, pw->pw_uid, pw->pw_gid);
-
- (void) gethostname(localhost, sizeof(localhost));
- (void) strlcpy(phost, (char *)krb_get_phost(localhost), INST_SZ);
-
- /* 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. */
- r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33);
+#endif
- 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));
+ /* Check for users with no password. */
+ if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
+ return 1;
- /* 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:
- (void) dest_tkt();
- xfree(ticket);
- ticket = 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. */
- }
+ pw_password = pw->pw_passwd;
- /* Encrypt the candidate password using the proper salt. */
- encrypted_password = crypt(password,
- (pw->pw_passwd[0] && pw->pw_passwd[1]) ?
- pw->pw_passwd : "xx");
+#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
+ spw = getspnam(pw->pw_name);
+ if (spw != NULL)
+ {
+ /* Check for users with no password. */
+ if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0)
+ return 1;
- /* Authentication is accepted if the encrypted passwords are identical. */
- return (strcmp(encrypted_password, pw->pw_passwd) == 0);
-#endif /* HAVE_PAM */
+ pw_password = spw->sp_pwdp;
+ }
+#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
+
+ 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 */
+ encrypted_password = crypt(password, salt);
+#endif /* HAVE_MD5_PASSWORDS */
+
+ /* Authentication is accepted if the encrypted passwords are identical. */
+ return (strcmp(encrypted_password, pw_password) == 0);
}
+#endif /* !USE_PAM */
andersk / openssh.git / blobdiff