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https://github.com/samba-team/samba.git
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4d792db03f
Coverity-Id: 1168009 BUG: https://bugzilla.samba.org/show_bug.cgi?id=8598 Signed-off-by: Andreas Schneider <asn@samba.org> Change-Id: Ie01674561a6a75239a13918d3190c2f21c3efc7a Reviewed-by: Andrew Bartlett <abartlet@samba.org>
529 lines
16 KiB
C
529 lines
16 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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "auth.h"
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#include "../lib/tsocket/tsocket.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_AUTH
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static_decl_auth;
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static struct auth_init_function_entry *auth_backends = NULL;
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static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
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NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
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{
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struct auth_init_function_entry *entry = auth_backends;
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if (version != AUTH_INTERFACE_VERSION) {
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DEBUG(0,("Can't register auth_method!\n"
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"You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
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version,AUTH_INTERFACE_VERSION));
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return NT_STATUS_OBJECT_TYPE_MISMATCH;
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}
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if (!name || !init) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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DEBUG(5,("Attempting to register auth backend %s\n", name));
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if (auth_find_backend_entry(name)) {
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DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
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return NT_STATUS_OBJECT_NAME_COLLISION;
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}
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entry = SMB_XMALLOC_P(struct auth_init_function_entry);
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entry->name = smb_xstrdup(name);
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entry->init = init;
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DLIST_ADD(auth_backends, entry);
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DEBUG(5,("Successfully added auth method '%s'\n", name));
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return NT_STATUS_OK;
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}
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static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
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{
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struct auth_init_function_entry *entry = auth_backends;
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while(entry) {
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if (strcmp(entry->name, name)==0) return entry;
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entry = entry->next;
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}
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return NULL;
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}
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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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NTSTATUS auth_get_ntlm_challenge(struct auth_context *auth_context,
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uint8_t chal[8])
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{
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uchar tmp[8];
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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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memcpy(chal, auth_context->challenge.data, 8);
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return NT_STATUS_OK;
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}
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generate_random_buffer(tmp, sizeof(tmp));
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auth_context->challenge = data_blob_talloc(auth_context,
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tmp, sizeof(tmp));
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auth_context->challenge_set_by = "random";
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memcpy(chal, auth_context->challenge.data, 8);
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return NT_STATUS_OK;
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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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* This function does NOT need to be in a become_root()/unbecome_root() pair
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* as it makes the calls itself when needed.
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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 struct samu 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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NTSTATUS auth_check_ntlm_password(TALLOC_CTX *mem_ctx,
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const struct auth_context *auth_context,
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const struct auth_usersupplied_info *user_info,
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struct auth_serversupplied_info **pserver_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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const char *unix_username;
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auth_methods *auth_method;
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if (user_info == NULL || auth_context == NULL || pserver_info == NULL) {
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return NT_STATUS_LOGON_FAILURE;
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}
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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_name, user_info->client.account_name, user_info->workstation_name));
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DEBUG(3, ("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
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user_info->mapped.domain_name, user_info->mapped.account_name, user_info->workstation_name));
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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, 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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(int)user_info->password.response.lanman.length, (int)user_info->password.response.nt.length));
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DEBUG(100, ("lm:\n"));
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dump_data(100, user_info->password.response.lanman.data, user_info->password.response.lanman.length);
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DEBUG(100, ("nt:\n"));
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dump_data(100, user_info->password.response.nt.data, user_info->password.response.nt.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->client.account_name, user_info->mapped.domain_name))
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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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struct auth_serversupplied_info *server_info;
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TALLOC_CTX *tmp_ctx;
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NTSTATUS result;
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tmp_ctx = talloc_named(mem_ctx,
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0,
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"%s authentication for user %s\\%s",
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auth_method->name,
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user_info->mapped.domain_name,
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user_info->client.account_name);
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result = auth_method->auth(auth_context,
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auth_method->private_data,
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tmp_ctx,
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user_info,
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&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_FREE(tmp_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->client.account_name));
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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->client.account_name, nt_errstr(nt_status)));
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}
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if (NT_STATUS_IS_OK(nt_status)) {
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*pserver_info = talloc_steal(mem_ctx, server_info);
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TALLOC_FREE(tmp_ctx);
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break;
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}
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TALLOC_FREE(tmp_ctx);
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}
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/* successful authentication */
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if (NT_STATUS_IS_OK(nt_status)) {
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unix_username = (*pserver_info)->unix_name;
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if (!(*pserver_info)->guest) {
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const char *rhost;
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if (tsocket_address_is_inet(user_info->remote_host, "ip")) {
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rhost = tsocket_address_inet_addr_string(user_info->remote_host,
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talloc_tos());
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if (rhost == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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} else {
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rhost = "127.0.0.1";
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}
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/* We might not be root if we are an RPC call */
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become_root();
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nt_status = smb_pam_accountcheck(unix_username,
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rhost);
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unbecome_root();
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if (NT_STATUS_IS_OK(nt_status)) {
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DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] succeeded\n",
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unix_username));
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} else {
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DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] FAILED with error %s\n",
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unix_username, nt_errstr(nt_status)));
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}
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}
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if (NT_STATUS_IS_OK(nt_status)) {
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DEBUG((*pserver_info)->guest ? 5 : 2,
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("check_ntlm_password: %sauthentication for user [%s] -> [%s] -> [%s] succeeded\n",
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(*pserver_info)->guest ? "guest " : "",
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user_info->client.account_name,
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user_info->mapped.account_name,
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unix_username));
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}
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return nt_status;
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}
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/* failed authentication; check for guest lapping */
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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->client.account_name, user_info->mapped.account_name,
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nt_errstr(nt_status)));
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ZERO_STRUCTP(pserver_info);
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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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static int auth_context_destructor(void *ptr)
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{
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struct auth_context *ctx = talloc_get_type(ptr, struct auth_context);
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struct auth_methods *am;
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/* Free private data of context's authentication methods */
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for (am = ctx->auth_method_list; am; am = am->next) {
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TALLOC_FREE(am->private_data);
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}
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return 0;
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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(TALLOC_CTX *mem_ctx,
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struct auth_context **auth_context)
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{
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struct auth_context *ctx;
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ctx = talloc_zero(mem_ctx, struct auth_context);
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if (!ctx) {
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DEBUG(0,("make_auth_context: talloc failed!\n"));
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return NT_STATUS_NO_MEMORY;
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}
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talloc_set_destructor((TALLOC_CTX *)ctx, auth_context_destructor);
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*auth_context = ctx;
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return NT_STATUS_OK;
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}
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bool load_auth_module(struct auth_context *auth_context,
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const char *module, auth_methods **ret)
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{
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static bool initialised_static_modules = False;
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struct auth_init_function_entry *entry;
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char *module_name = smb_xstrdup(module);
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char *module_params = NULL;
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char *p;
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bool good = False;
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/* Initialise static modules if not done so yet */
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if(!initialised_static_modules) {
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static_init_auth;
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initialised_static_modules = True;
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}
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DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
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module));
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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_char(module_params, ' ', ' ');
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}
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trim_char(module_name, ' ', ' ');
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entry = auth_find_backend_entry(module_name);
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if (entry == NULL) {
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if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
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entry = auth_find_backend_entry(module_name);
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}
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}
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if (entry != NULL) {
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if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
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DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
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module_name));
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} else {
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DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
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module_name));
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good = True;
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}
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} else {
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DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
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}
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SAFE_FREE(module_name);
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return good;
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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(TALLOC_CTX *mem_ctx,
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struct auth_context **auth_context,
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char **text_list)
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{
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auth_methods *list = NULL;
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auth_methods *t, *method = NULL;
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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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nt_status = make_auth_context(mem_ctx, auth_context);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return nt_status;
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}
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for (;*text_list; text_list++) {
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if (load_auth_module(*auth_context, *text_list, &t)) {
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DLIST_ADD_END(list, t, auth_methods *);
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}
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}
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(*auth_context)->auth_method_list = list;
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/* Look for the first module to provide a prepare_gensec and
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* make_auth4_context hook, and set that if provided */
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for (method = (*auth_context)->auth_method_list; method; method = method->next) {
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if (method->prepare_gensec && method->make_auth4_context) {
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(*auth_context)->prepare_gensec = method->prepare_gensec;
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(*auth_context)->make_auth4_context = method->make_auth4_context;
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break;
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}
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}
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return NT_STATUS_OK;
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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(TALLOC_CTX *mem_ctx,
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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()
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&& !(auth_method_list = str_list_copy(talloc_tos(),
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lp_auth_methods()))) {
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return NT_STATUS_NO_MEMORY;
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}
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if (auth_method_list == NULL) {
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switch (lp_server_role())
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{
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case ROLE_DOMAIN_MEMBER:
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DEBUG(5,("Making default auth method list for server role = 'domain member'\n"));
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auth_method_list = str_list_make_v3(
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talloc_tos(), "guest sam winbind:ntdomain",
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NULL);
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break;
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case ROLE_DOMAIN_BDC:
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case ROLE_DOMAIN_PDC:
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DEBUG(5,("Making default auth method list for DC\n"));
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auth_method_list = str_list_make_v3(
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talloc_tos(),
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"guest sam winbind:trustdomain",
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NULL);
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break;
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case ROLE_STANDALONE:
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DEBUG(5,("Making default auth method list for server role = 'standalone server', encrypt passwords = yes\n"));
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if (lp_encrypt_passwords()) {
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auth_method_list = str_list_make_v3(
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talloc_tos(), "guest sam",
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NULL);
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} else {
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DEBUG(5,("Making default auth method list for server role = 'standalone server', encrypt passwords = no\n"));
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auth_method_list = str_list_make_v3(
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talloc_tos(), "guest unix", NULL);
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}
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break;
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case ROLE_ACTIVE_DIRECTORY_DC:
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DEBUG(5,("Making default auth method list for server role = 'active directory domain controller'\n"));
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auth_method_list = str_list_make_v3(
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talloc_tos(),
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"samba4",
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NULL);
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break;
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default:
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DEBUG(5,("Unknown auth method!\n"));
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return NT_STATUS_UNSUCCESSFUL;
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}
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} else {
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DEBUG(5,("Using specified auth order\n"));
|
|
}
|
|
|
|
nt_status = make_auth_context_text_list(mem_ctx, auth_context,
|
|
auth_method_list);
|
|
|
|
TALLOC_FREE(auth_method_list);
|
|
return nt_status;
|
|
}
|
|
|
|
/***************************************************************************
|
|
Make a auth_info struct with a fixed challenge
|
|
***************************************************************************/
|
|
|
|
NTSTATUS make_auth_context_fixed(TALLOC_CTX *mem_ctx,
|
|
struct auth_context **auth_context,
|
|
uchar chal[8])
|
|
{
|
|
NTSTATUS nt_status;
|
|
nt_status = make_auth_context_subsystem(mem_ctx, auth_context);
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
return nt_status;
|
|
}
|
|
|
|
(*auth_context)->challenge = data_blob_talloc(*auth_context, chal, 8);
|
|
(*auth_context)->challenge_set_by = "fixed";
|
|
return nt_status;
|
|
}
|
|
|
|
|