mirror of
https://github.com/samba-team/samba.git
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6564fd402d
metze
(This used to be commit e5d338821e
)
497 lines
15 KiB
C
497 lines
15 KiB
C
/*
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Unix SMB/CIFS implementation.
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Password and authentication handling
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Copyright (C) Andrew Bartlett 2001-2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_AUTH
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/****************************************************************************
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Try to get a challenge out of the various authentication modules.
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Returns a const char of length 8 bytes.
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****************************************************************************/
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static const uint8_t *get_ntlm_challenge(struct auth_context *auth_context)
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{
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DATA_BLOB challenge = data_blob(NULL, 0);
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const char *challenge_set_by = NULL;
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struct auth_methods *auth_method;
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TALLOC_CTX *mem_ctx;
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if (auth_context->challenge.length) {
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DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge by module %s (normal)\n",
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auth_context->challenge_set_by));
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return auth_context->challenge.data;
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}
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auth_context->challenge_may_be_modified = False;
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for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next) {
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if (auth_method->get_chal == NULL) {
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DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
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continue;
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}
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DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
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if (challenge_set_by != NULL) {
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DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authentication method %s has already specified a challenge. Challenge by %s ignored.\n",
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challenge_set_by, auth_method->name));
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continue;
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}
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mem_ctx = talloc_init("auth_get_challenge for module %s", auth_method->name);
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if (!mem_ctx) {
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smb_panic("talloc_init() failed!");
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}
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challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
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if (!challenge.length) {
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DEBUG(3, ("auth_get_challenge: getting challenge from authentication method %s FAILED.\n",
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auth_method->name));
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} else {
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DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
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auth_context->challenge = challenge;
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challenge_set_by = auth_method->name;
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auth_context->challenge_set_method = auth_method;
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}
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talloc_destroy(mem_ctx);
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}
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if (!challenge_set_by) {
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uint8_t chal[8];
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generate_random_buffer(chal, sizeof(chal), False);
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auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
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chal, sizeof(chal));
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challenge_set_by = "random";
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auth_context->challenge_may_be_modified = True;
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}
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DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
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DEBUG(5, ("challenge is: \n"));
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dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
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SMB_ASSERT(auth_context->challenge.length == 8);
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auth_context->challenge_set_by=challenge_set_by;
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return auth_context->challenge.data;
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}
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/**
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* Check user is in correct domain (if required)
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*
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* @param user Only used to fill in the debug message
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*
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* @param domain The domain to be verified
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*
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* @return True if the user can connect with that domain,
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* False otherwise.
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**/
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static BOOL check_domain_match(const char *user, const char *domain)
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{
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/*
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* If we aren't serving to trusted domains, we must make sure that
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* the validation request comes from an account in the same domain
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* as the Samba server
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*/
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if (!lp_allow_trusted_domains() &&
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!(strequal("", domain) ||
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strequal(lp_workgroup(), domain) ||
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is_myname(domain))) {
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DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
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return False;
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} else {
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return True;
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}
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}
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/**
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* Check a user's Plaintext, LM or NTLM password.
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*
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* Check a user's password, as given in the user_info struct and return various
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* interesting details in the server_info struct.
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*
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* The return value takes precedence over the contents of the server_info
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* struct. When the return is other than NT_STATUS_OK the contents
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* of that structure is undefined.
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*
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* @param user_info Contains the user supplied components, including the passwords.
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* Must be created with make_user_info() or one of its wrappers.
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*
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* @param auth_context Supplies the challenges and some other data.
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* Must be created with make_auth_context(), and the challenges should be
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* filled in, either at creation or by calling the challenge geneation
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* function auth_get_challenge().
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*
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* @param server_info If successful, contains information about the authentication,
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* including a SAM_ACCOUNT struct describing the user.
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*
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* @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
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*
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**/
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static NTSTATUS check_ntlm_password(struct auth_context *auth_context,
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const struct auth_usersupplied_info *user_info,
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struct auth_serversupplied_info **server_info)
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{
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/* if all the modules say 'not for me' this is reasonable */
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NTSTATUS nt_status = NT_STATUS_NO_SUCH_USER;
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struct auth_methods *auth_method;
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TALLOC_CTX *mem_ctx;
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if (!user_info || !auth_context || !server_info)
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return NT_STATUS_LOGON_FAILURE;
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DEBUG(3, ("check_ntlm_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
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user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
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DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
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user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
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if (auth_context->challenge.length == 0) {
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/* get a challenge, if we have not asked for one yet */
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get_ntlm_challenge(auth_context);
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}
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if (auth_context->challenge.length != 8) {
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DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
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return NT_STATUS_LOGON_FAILURE;
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}
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if (auth_context->challenge_set_by)
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DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
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auth_context->challenge_set_by));
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DEBUG(10, ("challenge is: \n"));
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dump_data(5, (const char *)auth_context->challenge.data, auth_context->challenge.length);
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("user_info has passwords of length %d and %d\n",
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user_info->lm_resp.length, user_info->nt_resp.length));
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DEBUG(100, ("lm:\n"));
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dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
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DEBUG(100, ("nt:\n"));
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dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
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#endif
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/* This needs to be sorted: If it doesn't match, what should we do? */
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if (!check_domain_match(user_info->smb_name.str, user_info->domain.str))
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return NT_STATUS_LOGON_FAILURE;
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for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
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NTSTATUS result;
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mem_ctx = talloc_init("%s authentication for user %s\\%s", auth_method->name,
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user_info->domain.str, user_info->smb_name.str);
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result = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
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/* check if the module did anything */
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if ( NT_STATUS_V(result) == NT_STATUS_V(NT_STATUS_NOT_IMPLEMENTED) ) {
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DEBUG(10,("check_ntlm_password: %s had nothing to say\n", auth_method->name));
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talloc_destroy(mem_ctx);
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continue;
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}
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nt_status = result;
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if (NT_STATUS_IS_OK(nt_status)) {
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DEBUG(3, ("check_ntlm_password: %s authentication for user [%s] succeeded\n",
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auth_method->name, user_info->smb_name.str));
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} else {
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DEBUG(5, ("check_ntlm_password: %s authentication for user [%s] FAILED with error %s\n",
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auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
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}
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talloc_destroy(mem_ctx);
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if ( NT_STATUS_IS_OK(nt_status))
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{
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break;
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}
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}
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if (NT_STATUS_IS_OK(nt_status)) {
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if (NT_STATUS_IS_OK(nt_status)) {
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DEBUG((*server_info)->guest ? 5 : 2,
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("check_ntlm_password: %sauthentication for user [%s] -> [%s] succeeded\n",
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(*server_info)->guest ? "guest " : "",
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user_info->smb_name.str,
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user_info->internal_username.str));
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}
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}
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(2, ("check_ntlm_password: Authentication for user [%s] -> [%s] FAILED with error %s\n",
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user_info->smb_name.str, user_info->internal_username.str,
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nt_errstr(nt_status)));
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ZERO_STRUCTP(server_info);
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}
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return nt_status;
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}
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/***************************************************************************
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Clear out a auth_context, and destroy the attached TALLOC_CTX
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***************************************************************************/
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void free_auth_context(struct auth_context **auth_context)
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{
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struct auth_methods *auth_method;
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if (*auth_context) {
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/* Free private data of context's authentication methods */
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for (auth_method = (*auth_context)->auth_method_list; auth_method; auth_method = auth_method->next) {
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if (auth_method->free_private_data) {
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auth_method->free_private_data (&auth_method->private_data);
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auth_method->private_data = NULL;
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}
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}
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talloc_destroy((*auth_context)->mem_ctx);
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*auth_context = NULL;
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}
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}
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/***************************************************************************
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Make a auth_info struct
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***************************************************************************/
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static NTSTATUS make_auth_context(struct auth_context **auth_context)
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{
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TALLOC_CTX *mem_ctx;
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mem_ctx = talloc_init("authentication context");
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*auth_context = talloc(mem_ctx, sizeof(**auth_context));
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if (!*auth_context) {
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DEBUG(0,("make_auth_context: talloc failed!\n"));
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talloc_destroy(mem_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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ZERO_STRUCTP(*auth_context);
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(*auth_context)->mem_ctx = mem_ctx;
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(*auth_context)->check_ntlm_password = check_ntlm_password;
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(*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
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return NT_STATUS_OK;
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}
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/***************************************************************************
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Make a auth_info struct for the auth subsystem
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***************************************************************************/
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static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
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{
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struct auth_methods *list = NULL;
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struct auth_methods *t = NULL;
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int i;
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NTSTATUS nt_status;
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if (!text_list) {
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DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
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return NT_STATUS_UNSUCCESSFUL;
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}
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if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context)))
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return nt_status;
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for (;*text_list; text_list++) {
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char *module_name = smb_xstrdup(*text_list);
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char *module_params = NULL;
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char *p;
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const struct auth_operations *ops;
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DEBUG(5,("make_auth_context_text_list: Attempting to find an auth method to match %s\n",
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*text_list));
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p = strchr(module_name, ':');
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if (p) {
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*p = 0;
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module_params = p+1;
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trim_string(module_params, " ", " ");
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}
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trim_string(module_name, " ", " ");
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ops = auth_backend_byname(module_name);
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if (!ops) {
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DEBUG(5,("make_auth_context_text_list: Found auth method %s (at pos %d)\n", *text_list, i));
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SAFE_FREE(module_name);
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break;
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}
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if (NT_STATUS_IS_OK(ops->init(*auth_context, module_params, &t))) {
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DEBUG(5,("make_auth_context_text_list: auth method %s has a valid init\n",
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*text_list));
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DLIST_ADD_END(list, t, struct auth_methods *);
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} else {
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DEBUG(0,("make_auth_context_text_list: auth method %s did not correctly init\n",
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*text_list));
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}
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SAFE_FREE(module_name);
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}
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(*auth_context)->auth_method_list = list;
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return nt_status;
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}
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/***************************************************************************
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Make a auth_context struct for the auth subsystem
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***************************************************************************/
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NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
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{
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char **auth_method_list = NULL;
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NTSTATUS nt_status;
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if (lp_auth_methods() && !str_list_copy(&auth_method_list, lp_auth_methods())) {
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return NT_STATUS_NO_MEMORY;
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}
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if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
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str_list_free(&auth_method_list);
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return nt_status;
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}
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str_list_free(&auth_method_list);
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return nt_status;
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}
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/***************************************************************************
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Make a auth_info struct with a fixed challenge
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***************************************************************************/
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NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uint8_t chal[8])
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{
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NTSTATUS nt_status;
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if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
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return nt_status;
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}
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(*auth_context)->challenge = data_blob_talloc((*auth_context)->mem_ctx, chal, 8);
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(*auth_context)->challenge_set_by = "fixed";
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return nt_status;
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}
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/* the list of currently registered AUTH backends */
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static struct {
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const struct auth_operations *ops;
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} *backends = NULL;
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static int num_backends;
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/*
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register a AUTH backend.
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The 'name' can be later used by other backends to find the operations
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structure for this backend.
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*/
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static NTSTATUS auth_register(void *_ops)
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{
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const struct auth_operations *ops = _ops;
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struct auth_operations *new_ops;
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if (auth_backend_byname(ops->name) != NULL) {
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/* its already registered! */
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DEBUG(0,("AUTH backend '%s' already registered\n",
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ops->name));
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return NT_STATUS_OBJECT_NAME_COLLISION;
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}
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backends = Realloc(backends, sizeof(backends[0]) * (num_backends+1));
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if (!backends) {
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smb_panic("out of memory in auth_register");
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}
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new_ops = smb_xmemdup(ops, sizeof(*ops));
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new_ops->name = smb_xstrdup(ops->name);
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backends[num_backends].ops = new_ops;
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num_backends++;
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DEBUG(3,("AUTH backend '%s' registered\n",
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ops->name));
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return NT_STATUS_OK;
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}
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/*
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return the operations structure for a named backend of the specified type
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*/
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const struct auth_operations *auth_backend_byname(const char *name)
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{
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int i;
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for (i=0;i<num_backends;i++) {
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if (strcmp(backends[i].ops->name, name) == 0) {
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return backends[i].ops;
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}
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}
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return NULL;
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}
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/*
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return the AUTH interface version, and the size of some critical types
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This can be used by backends to either detect compilation errors, or provide
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multiple implementations for different smbd compilation options in one module
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*/
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const struct auth_critical_sizes *auth_interface_version(void)
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{
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static const struct auth_critical_sizes critical_sizes = {
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AUTH_INTERFACE_VERSION,
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sizeof(struct auth_operations),
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sizeof(struct auth_methods),
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sizeof(struct auth_context),
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sizeof(struct auth_ntlmssp_state),
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sizeof(struct auth_usersupplied_info),
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sizeof(struct auth_serversupplied_info),
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sizeof(struct auth_str),
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};
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return &critical_sizes;
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}
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/*
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initialise the AUTH subsystem
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*/
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BOOL auth_init(void)
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{
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NTSTATUS status;
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status = register_subsystem("auth", auth_register);
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if (!NT_STATUS_IS_OK(status)) {
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return False;
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}
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/* FIXME: Perhaps panic if a basic backend, such as SAM, fails to initialise? */
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static_init_auth;
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DEBUG(3,("AUTH subsystem version %d initialised\n", AUTH_INTERFACE_VERSION));
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return True;
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}
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