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-rw-r--r--source3/auth/auth.c639
1 files changed, 639 insertions, 0 deletions
diff --git a/source3/auth/auth.c b/source3/auth/auth.c
new file mode 100644
index 0000000..b83e98f
--- /dev/null
+++ b/source3/auth/auth.c
@@ -0,0 +1,639 @@
+/*
+ Unix SMB/CIFS implementation.
+ Password and authentication handling
+ Copyright (C) Andrew Bartlett 2001-2002
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "auth.h"
+#include "../lib/tsocket/tsocket.h"
+
+#include "param/param.h"
+#include "../lib/messaging/messaging.h"
+#include "lib/global_contexts.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+static_decl_auth;
+
+static struct auth_init_function_entry *auth_backends = NULL;
+
+static struct auth_init_function_entry *auth_find_backend_entry(const char *name);
+
+NTSTATUS smb_register_auth(int version, const char *name, auth_init_function init)
+{
+ struct auth_init_function_entry *entry = NULL;
+
+ if (version != AUTH_INTERFACE_VERSION) {
+ DEBUG(0,("Can't register auth_method!\n"
+ "You tried to register an auth module with AUTH_INTERFACE_VERSION %d, while this version of samba uses %d\n",
+ version,AUTH_INTERFACE_VERSION));
+ return NT_STATUS_OBJECT_TYPE_MISMATCH;
+ }
+
+ if (!name || !init) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ DEBUG(5,("Attempting to register auth backend %s\n", name));
+
+ if (auth_find_backend_entry(name)) {
+ DEBUG(0,("There already is an auth method registered with the name %s!\n", name));
+ return NT_STATUS_OBJECT_NAME_COLLISION;
+ }
+
+ entry = SMB_XMALLOC_P(struct auth_init_function_entry);
+ entry->name = smb_xstrdup(name);
+ entry->init = init;
+
+ DLIST_ADD(auth_backends, entry);
+ DEBUG(5,("Successfully added auth method '%s'\n", name));
+ return NT_STATUS_OK;
+}
+
+static struct auth_init_function_entry *auth_find_backend_entry(const char *name)
+{
+ struct auth_init_function_entry *entry = auth_backends;
+
+ while(entry) {
+ if (strcmp(entry->name, name)==0) return entry;
+ entry = entry->next;
+ }
+
+ return NULL;
+}
+
+/****************************************************************************
+ Try to get a challenge out of the various authentication modules.
+ Returns a const char of length 8 bytes.
+****************************************************************************/
+
+NTSTATUS auth_get_ntlm_challenge(struct auth_context *auth_context,
+ uint8_t chal[8])
+{
+ if (auth_context->challenge.length) {
+ DBG_INFO("get_ntlm_challenge (auth subsystem): returning "
+ "previous challenge by module %s (normal)\n",
+ auth_context->challenge_set_by);
+ memcpy(chal, auth_context->challenge.data, 8);
+ return NT_STATUS_OK;
+ }
+
+ auth_context->challenge = data_blob_talloc(auth_context, NULL, 8);
+ if (auth_context->challenge.data == NULL) {
+ DBG_WARNING("data_blob_talloc failed\n");
+ return NT_STATUS_NO_MEMORY;
+ }
+ generate_random_buffer(
+ auth_context->challenge.data, auth_context->challenge.length);
+
+ auth_context->challenge_set_by = "random";
+
+ memcpy(chal, auth_context->challenge.data, 8);
+ return NT_STATUS_OK;
+}
+
+
+/**
+ * Check user is in correct domain (if required)
+ *
+ * @param user Only used to fill in the debug message
+ *
+ * @param domain The domain to be verified
+ *
+ * @return True if the user can connect with that domain,
+ * False otherwise.
+**/
+
+static bool check_domain_match(const char *user, const char *domain)
+{
+ /*
+ * If we aren't serving to trusted domains, we must make sure that
+ * the validation request comes from an account in the same domain
+ * as the Samba server
+ */
+
+ if (!lp_allow_trusted_domains() &&
+ !(strequal("", domain) ||
+ strequal(lp_workgroup(), domain) ||
+ is_myname(domain))) {
+ DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
+ return False;
+ } else {
+ return True;
+ }
+}
+
+/**
+ * Check a user's Plaintext, LM or NTLM password.
+ *
+ * Check a user's password, as given in the user_info struct and return various
+ * interesting details in the server_info struct.
+ *
+ * This function does NOT need to be in a become_root()/unbecome_root() pair
+ * as it makes the calls itself when needed.
+ *
+ * The return value takes precedence over the contents of the server_info
+ * struct. When the return is other than NT_STATUS_OK the contents
+ * of that structure is undefined.
+ *
+ * @param user_info Contains the user supplied components, including the passwords.
+ * Must be created with make_user_info() or one of its wrappers.
+ *
+ * @param auth_context Supplies the challenges and some other data.
+ * Must be created with make_auth_context(), and the challenges should be
+ * filled in, either at creation or by calling the challenge generation
+ * function auth_get_challenge().
+ *
+ * @param pserver_info If successful, contains information about the authentication,
+ * including a struct samu struct describing the user.
+ *
+ * @param pauthoritative Indicates if the result should be treated as final
+ * result.
+ *
+ * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
+ *
+ **/
+NTSTATUS auth_check_ntlm_password(TALLOC_CTX *mem_ctx,
+ const struct auth_context *auth_context,
+ const struct auth_usersupplied_info *user_info,
+ struct auth_serversupplied_info **pserver_info,
+ uint8_t *pauthoritative)
+{
+ TALLOC_CTX *frame;
+ const char *auth_method_name = "";
+ /* if all the modules say 'not for me' this is reasonable */
+ NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
+ const char *unix_username;
+ struct auth_methods *auth_method;
+ struct auth_serversupplied_info *server_info = NULL;
+ struct dom_sid sid = {0};
+ struct imessaging_context *msg_ctx = NULL;
+ struct loadparm_context *lp_ctx = NULL;
+
+ if (user_info == NULL || auth_context == NULL || pserver_info == NULL) {
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ frame = talloc_stackframe();
+
+ if (lp_auth_event_notification()) {
+ lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers());
+ msg_ctx = imessaging_client_init(
+ frame, lp_ctx, global_event_context());
+ }
+
+ *pauthoritative = 1;
+
+ DBG_NOTICE("check_ntlm_password: Checking password for unmapped user "
+ "[%s]\\[%s]@[%s] with the new password interface\n",
+ user_info->client.domain_name,
+ user_info->client.account_name,
+ user_info->workstation_name);
+
+ DBG_NOTICE("check_ntlm_password: mapped user is: [%s]\\[%s]@[%s]\n",
+ user_info->mapped.domain_name,
+ user_info->mapped.account_name,
+ user_info->workstation_name);
+
+ if (auth_context->challenge.length != 8) {
+ DEBUG(0, ("check_ntlm_password: Invalid challenge stored for this auth context - cannot continue\n"));
+ nt_status = NT_STATUS_LOGON_FAILURE;
+ goto fail;
+ }
+
+ if (auth_context->challenge_set_by)
+ DEBUG(10, ("check_ntlm_password: auth_context challenge created by %s\n",
+ auth_context->challenge_set_by));
+
+ DEBUG(10, ("challenge is: \n"));
+ dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100, ("user_info has passwords of length %d and %d\n",
+ (int)user_info->password.response.lanman.length, (int)user_info->password.response.nt.length));
+ DEBUG(100, ("lm:\n"));
+ dump_data(100, user_info->password.response.lanman.data, user_info->password.response.lanman.length);
+ DEBUG(100, ("nt:\n"));
+ dump_data(100, user_info->password.response.nt.data, user_info->password.response.nt.length);
+#endif
+
+ /* This needs to be sorted: If it doesn't match, what should we do? */
+ if (!check_domain_match(user_info->client.account_name,
+ user_info->mapped.domain_name)) {
+ nt_status = NT_STATUS_LOGON_FAILURE;
+ goto fail;
+ }
+
+ for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next) {
+
+ auth_method_name = auth_method->name;
+
+ nt_status = auth_method->auth(auth_context,
+ auth_method->private_data,
+ talloc_tos(),
+ user_info,
+ &server_info);
+
+ if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_NOT_IMPLEMENTED)) {
+ break;
+ }
+
+ DBG_DEBUG("%s had nothing to say\n", auth_method->name);
+ }
+
+ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NOT_IMPLEMENTED)) {
+ *pauthoritative = 0;
+ nt_status = NT_STATUS_NO_SUCH_USER;
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DBG_INFO("%s authentication for user [%s] FAILED with "
+ "error %s, authoritative=%u\n",
+ auth_method_name,
+ user_info->client.account_name,
+ nt_errstr(nt_status),
+ *pauthoritative);
+ goto fail;
+ }
+
+ DBG_NOTICE("%s authentication for user [%s] succeeded\n",
+ auth_method_name, user_info->client.account_name);
+
+ unix_username = server_info->unix_name;
+
+ /* We skip doing this step if the caller asked us not to */
+ if (!(user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ)
+ && !(server_info->guest)) {
+ const char *rhost;
+
+ if (tsocket_address_is_inet(user_info->remote_host, "ip")) {
+ rhost = tsocket_address_inet_addr_string(
+ user_info->remote_host, talloc_tos());
+ if (rhost == NULL) {
+ nt_status = NT_STATUS_NO_MEMORY;
+ goto fail;
+ }
+ } else {
+ rhost = "127.0.0.1";
+ }
+
+ /* We might not be root if we are an RPC call */
+ become_root();
+ nt_status = smb_pam_accountcheck(unix_username, rhost);
+ unbecome_root();
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(5, ("check_ntlm_password: PAM Account for user [%s] "
+ "succeeded\n", unix_username));
+ } else {
+ DEBUG(3, ("check_ntlm_password: PAM Account for user [%s] "
+ "FAILED with error %s\n",
+ unix_username, nt_errstr(nt_status)));
+ }
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ goto fail;
+ }
+
+ nt_status = get_user_sid_info3_and_extra(server_info->info3,
+ &server_info->extra,
+ &sid);
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ sid = (struct dom_sid) {0};
+ }
+
+ log_authentication_event(msg_ctx,
+ lp_ctx,
+ &auth_context->start_time,
+ user_info,
+ nt_status,
+ server_info->info3->base.logon_domain.string,
+ server_info->info3->base.account_name.string,
+ &sid,
+ NULL /* client_audit_info */,
+ NULL /* server_audit_info */);
+
+ DEBUG(server_info->guest ? 5 : 2,
+ ("check_ntlm_password: %sauthentication for user "
+ "[%s] -> [%s] -> [%s] succeeded\n",
+ server_info->guest ? "guest " : "",
+ user_info->client.account_name,
+ user_info->mapped.account_name,
+ unix_username));
+
+ *pserver_info = talloc_move(mem_ctx, &server_info);
+
+ TALLOC_FREE(frame);
+ return NT_STATUS_OK;
+
+fail:
+
+ /* failed authentication; check for guest lapping */
+
+ /*
+ * Please try not to change this string, it is probably in use
+ * in audit logging tools
+ */
+ DEBUG(2, ("check_ntlm_password: Authentication for user "
+ "[%s] -> [%s] FAILED with error %s, authoritative=%u\n",
+ user_info->client.account_name, user_info->mapped.account_name,
+ nt_errstr(nt_status), *pauthoritative));
+
+ log_authentication_event(msg_ctx,
+ lp_ctx,
+ &auth_context->start_time,
+ user_info,
+ nt_status,
+ NULL,
+ NULL,
+ NULL,
+ NULL /* client_audit_info */,
+ NULL /* server_audit_info */);
+
+ ZERO_STRUCTP(pserver_info);
+
+ TALLOC_FREE(frame);
+
+ return nt_status;
+}
+
+/***************************************************************************
+ Clear out a auth_context, and destroy the attached TALLOC_CTX
+***************************************************************************/
+
+static int auth_context_destructor(void *ptr)
+{
+ struct auth_context *ctx = talloc_get_type(ptr, struct auth_context);
+ struct auth_methods *am;
+
+
+ /* Free private data of context's authentication methods */
+ for (am = ctx->auth_method_list; am; am = am->next) {
+ TALLOC_FREE(am->private_data);
+ }
+
+ return 0;
+}
+
+/***************************************************************************
+ Make a auth_info struct
+***************************************************************************/
+
+static NTSTATUS make_auth_context(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context)
+{
+ struct auth_context *ctx;
+
+ ctx = talloc_zero(mem_ctx, struct auth_context);
+ if (!ctx) {
+ DEBUG(0,("make_auth_context: talloc failed!\n"));
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ ctx->start_time = timeval_current();
+
+ talloc_set_destructor((TALLOC_CTX *)ctx, auth_context_destructor);
+
+ *auth_context = ctx;
+ return NT_STATUS_OK;
+}
+
+static bool load_auth_module(
+ struct auth_context *auth_context,
+ const char *module,
+ struct auth_methods **ret)
+{
+ static bool initialised_static_modules = False;
+
+ struct auth_init_function_entry *entry;
+ char *module_name = smb_xstrdup(module);
+ char *module_params = NULL;
+ char *p;
+ bool good = False;
+
+ /* Initialise static modules if not done so yet */
+ if(!initialised_static_modules) {
+ static_init_auth(NULL);
+ initialised_static_modules = True;
+ }
+
+ DEBUG(5,("load_auth_module: Attempting to find an auth method to match %s\n",
+ module));
+
+ p = strchr(module_name, ':');
+ if (p) {
+ *p = 0;
+ module_params = p+1;
+ trim_char(module_params, ' ', ' ');
+ }
+
+ trim_char(module_name, ' ', ' ');
+
+ entry = auth_find_backend_entry(module_name);
+
+ if (entry == NULL) {
+ if (NT_STATUS_IS_OK(smb_probe_module("auth", module_name))) {
+ entry = auth_find_backend_entry(module_name);
+ }
+ }
+
+ if (entry != NULL) {
+ if (!NT_STATUS_IS_OK(entry->init(auth_context, module_params, ret))) {
+ DEBUG(0,("load_auth_module: auth method %s did not correctly init\n",
+ module_name));
+ } else {
+ DEBUG(5,("load_auth_module: auth method %s has a valid init\n",
+ module_name));
+ good = True;
+ }
+ } else {
+ DEBUG(0,("load_auth_module: can't find auth method %s!\n", module_name));
+ }
+
+ SAFE_FREE(module_name);
+ return good;
+}
+
+/***************************************************************************
+ Make a auth_info struct for the auth subsystem
+***************************************************************************/
+
+static NTSTATUS make_auth_context_text_list(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context,
+ char **text_list)
+{
+ struct auth_methods *list = NULL;
+ struct auth_methods *t, *method = NULL;
+ NTSTATUS nt_status;
+
+ if (!text_list) {
+ DEBUG(2,("make_auth_context_text_list: No auth method list!?\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ nt_status = make_auth_context(mem_ctx, auth_context);
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ return nt_status;
+ }
+
+ for (;*text_list; text_list++) {
+ if (load_auth_module(*auth_context, *text_list, &t)) {
+ DLIST_ADD_END(list, t);
+ }
+ }
+
+ (*auth_context)->auth_method_list = list;
+
+ /* Look for the first module to provide a prepare_gensec and
+ * make_auth4_context hook, and set that if provided */
+ for (method = (*auth_context)->auth_method_list; method; method = method->next) {
+ if (method->prepare_gensec && method->make_auth4_context) {
+ (*auth_context)->prepare_gensec = method->prepare_gensec;
+ (*auth_context)->make_auth4_context = method->make_auth4_context;
+ break;
+ }
+ }
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS make_auth_context_specific(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context,
+ const char *methods)
+{
+ char **method_list;
+ NTSTATUS status;
+
+ method_list = str_list_make_v3(talloc_tos(), methods, NULL);
+ if (method_list == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ status = make_auth_context_text_list(
+ mem_ctx, auth_context, method_list);
+
+ TALLOC_FREE(method_list);
+
+ return status;
+}
+
+/***************************************************************************
+ Make a auth_context struct for the auth subsystem
+***************************************************************************/
+
+NTSTATUS make_auth3_context_for_ntlm(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context)
+{
+ const char *methods = NULL;
+ const char *role = NULL;
+
+ switch (lp_server_role()) {
+ case ROLE_ACTIVE_DIRECTORY_DC:
+ role = "'active directory domain controller'";
+ methods = "samba4";
+ break;
+ case ROLE_DOMAIN_MEMBER:
+ role = "'domain member'";
+ methods = "anonymous sam winbind sam_ignoredomain";
+ break;
+ case ROLE_DOMAIN_BDC:
+ case ROLE_DOMAIN_PDC:
+ case ROLE_IPA_DC:
+ role = "'DC'";
+ methods = "anonymous sam winbind sam_ignoredomain";
+ break;
+ case ROLE_STANDALONE:
+ if (lp_encrypt_passwords()) {
+ role = "'standalone server', encrypt passwords = yes";
+ methods = "anonymous sam_ignoredomain";
+ } else {
+ role = "'standalone server', encrypt passwords = no";
+ methods = "anonymous unix";
+ }
+ break;
+ default:
+ DEBUG(5,("Unknown auth method!\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ DBG_INFO("Making default auth method list for server role = %s\n",
+ role);
+
+ return make_auth_context_specific(mem_ctx, auth_context, methods);
+}
+
+NTSTATUS make_auth3_context_for_netlogon(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context)
+{
+ const char *methods = NULL;
+
+ switch (lp_server_role()) {
+ case ROLE_DOMAIN_BDC:
+ case ROLE_DOMAIN_PDC:
+ case ROLE_IPA_DC:
+ methods = "sam_netlogon3 winbind";
+ break;
+
+ default:
+ DBG_ERR("Invalid server role!\n");
+ return NT_STATUS_INVALID_SERVER_STATE;
+ }
+
+ return make_auth_context_specific(mem_ctx, auth_context, methods);
+}
+
+NTSTATUS make_auth3_context_for_winbind(TALLOC_CTX *mem_ctx,
+ struct auth_context **auth_context)
+{
+ const char *methods = NULL;
+
+ switch (lp_server_role()) {
+ case ROLE_STANDALONE:
+ case ROLE_DOMAIN_MEMBER:
+ case ROLE_DOMAIN_BDC:
+ case ROLE_DOMAIN_PDC:
+ case ROLE_IPA_DC:
+ methods = "sam";
+ break;
+ case ROLE_ACTIVE_DIRECTORY_DC:
+ methods = "samba4:sam";
+ break;
+ default:
+ DEBUG(5,("Unknown auth method!\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ return make_auth_context_specific(mem_ctx, auth_context, methods);
+}
+
+bool auth3_context_set_challenge(
+ struct auth_context *ctx,
+ const uint8_t chal[8],
+ const char *challenge_set_by)
+{
+ ctx->challenge = data_blob_talloc(ctx, chal, 8);
+ if (ctx->challenge.data == NULL) {
+ return false;
+ }
+ ctx->challenge_set_by = talloc_strdup(ctx, challenge_set_by);
+ if (ctx->challenge_set_by == NULL) {
+ return false;
+ }
+ return true;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 09:58:40 +0000