63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Created: Sat Mar 18 05:11:38 1995 ylo
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* Password authentication. This file contains the functions to check whether
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* the password is valid for the user.
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*/
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#include "includes.h"
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RCSID("$Id: auth-passwd.c,v 1.14 1999/12/29 12:47:46 markus Exp $");
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#include "packet.h"
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#include "ssh.h"
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#include "servconf.h"
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#include "xmalloc.h"
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/*
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* Tries to authenticate the user using password. Returns true if
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* authentication succeeds.
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*/
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int
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auth_password(struct passwd * pw, const char *password)
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{
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extern ServerOptions options;
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char *encrypted_password;
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/* deny if no user. */
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if (pw == NULL)
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return 0;
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if (pw->pw_uid == 0 && options.permit_root_login == 2)
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return 0;
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if (*password == '\0' && options.permit_empty_passwd == 0)
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return 0;
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#ifdef SKEY
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if (options.skey_authentication == 1) {
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int ret = auth_skey_password(pw, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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#endif
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#ifdef KRB4
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if (options.kerberos_authentication == 1) {
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int ret = auth_krb4_password(pw, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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#endif
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/* Check for users with no password. */
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if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
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return 1;
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/* Encrypt the candidate password using the proper salt. */
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encrypted_password = crypt(password,
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(pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
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/* Authentication is accepted if the encrypted passwords are identical. */
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return (strcmp(encrypted_password, pw->pw_passwd) == 0);
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}
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