diff options
Diffstat (limited to 'crypto/openssh/auth-passwd.c')
| -rw-r--r-- | crypto/openssh/auth-passwd.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/crypto/openssh/auth-passwd.c b/crypto/openssh/auth-passwd.c new file mode 100644 index 0000000..c579af3 --- /dev/null +++ b/crypto/openssh/auth-passwd.c @@ -0,0 +1,122 @@ +/* + * Author: Tatu Ylonen <ylo@cs.hut.fi> + * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland + * All rights reserved + * 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. + * + * 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. + * + * + * 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 1.18 2000/10/03 18:03:03 markus Exp $"); +RCSID("$FreeBSD$"); + +#include "packet.h" +#include "ssh.h" +#include "servconf.h" +#include "xmalloc.h" + +/* + * 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; + + /* 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; + +#ifdef SKEY_VIA_PASSWD_IS_DISABLED + 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. */ + } +#endif +#ifdef KRB5 + if (options.krb5_authentication == 1) { + if (auth_krb5_password(pw, password)) + return 1; + /* Fall back to ordinary passwd authentication. */ + } + +#endif /* KRB5 */ +#ifdef KRB4 + if (options.krb4_authentication == 1) { + int ret = auth_krb4_password(pw, password); + if (ret == 1 || ret == 0) + return ret; + /* Fall back to ordinary passwd authentication. */ + } +#endif + + /* Check for users with no password. */ + if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) + return 1; + /* 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); +} |
