/*
-
-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
+ * 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"
#include "ssh.h"
#include "servconf.h"
#include "xmalloc.h"
-#include "config.h"
#ifdef HAVE_SHADOW_H
#include <shadow.h>
#include "md5crypt.h"
#endif
-/* Don't need anything from here if we are using PAM */
-
-/* Tries to authenticate the user using password. Returns true if
- authentication succeeds. */
-
-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;
+ extern ServerOptions options;
+ char *encrypted_password;
#ifdef HAVE_SHADOW_H
- struct spwd *spw;
+ struct spwd *spw;
#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;
+ if (pw->pw_uid == 0 && options.permit_root_login == 2) {
+ /* Server does not permit root login with password */
+ return 0;
+ }
+ if (*password == '\0' && options.permit_empty_passwd == 0) {
+ /* 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. */
- }
+ 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. */
+ }
#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;
+ /* 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);
+ } 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. */
}
- /* 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;
+#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;
}
-
- /* 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);
+ 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 ((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);
+ if (strlen(spw->sp_pwdp) < 3)
+ return(0);
- /* Encrypt the candidate password using the proper salt. */
+ /* 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);
- else
- encrypted_password = crypt(password, spw->sp_pwdp);
+ 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);
+ 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);
+ /* 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");
- /* 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);
+ /* Authentication is accepted if the encrypted passwords are identical. */
+ return (strcmp(encrypted_password, pw->pw_passwd) == 0);
#endif /* !HAVE_SHADOW_H */
}
-
#endif /* !HAVE_PAM */
andersk / openssh.git / blobdiff