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-rw-r--r--source3/auth/auth.c456
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diff --git a/source3/auth/auth.c b/source3/auth/auth.c
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+++ b/source3/auth/auth.c
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+/*
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/** List of various built-in authenticaion modules */
+
+const struct auth_init_function builtin_auth_init_functions[] = {
+ { "guest", auth_init_guest },
+ { "rhosts", auth_init_rhosts },
+ { "hostsequiv", auth_init_hostsequiv },
+ { "sam", auth_init_sam },
+ { "samstrict", auth_init_samstrict },
+ { "unix", auth_init_unix },
+ { "smbserver", auth_init_smbserver },
+ { "ntdomain", auth_init_ntdomain },
+ { "trustdomain", auth_init_trustdomain },
+ { "winbind", auth_init_winbind },
+#ifdef DEVELOPER
+ { "name_to_ntstatus", auth_init_name_to_ntstatus },
+#endif
+ { NULL, NULL}
+};
+
+/****************************************************************************
+ Try to get a challenge out of the various authenticaion modules.
+ Returns a const char of length 8 bytes.
+****************************************************************************/
+
+static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
+{
+ DATA_BLOB challenge = data_blob(NULL, 0);
+ char *challenge_set_by = NULL;
+ auth_methods *auth_method;
+ TALLOC_CTX *mem_ctx;
+
+ if (auth_context->challenge.length) {
+ DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge (normal)\n"));
+ return auth_context->challenge.data;
+ }
+
+ for (auth_method = auth_context->auth_method_list; auth_method; auth_method = auth_method->next)
+ {
+ if (auth_method->get_chal == NULL) {
+ DEBUG(5, ("auth_get_challenge: module %s did not want to specify a challenge\n", auth_method->name));
+ continue;
+ }
+
+ DEBUG(5, ("auth_get_challenge: getting challenge from module %s\n", auth_method->name));
+ if (challenge_set_by != NULL) {
+ DEBUG(1, ("auth_get_challenge: CONFIGURATION ERROR: authenticaion method %s has already specified a challenge. Challenge by %s ignored.\n",
+ challenge_set_by, auth_method->name));
+ continue;
+ }
+
+ mem_ctx = talloc_init_named("auth_get_challenge for module %s", auth_method->name);
+ if (!mem_ctx) {
+ smb_panic("talloc_init_named() failed!");
+ }
+
+ challenge = auth_method->get_chal(auth_context, &auth_method->private_data, mem_ctx);
+ if (!challenge.length) {
+ DEBUG(3, ("auth_get_challenge: getting challenge from authenticaion method %s FAILED.\n",
+ auth_method->name));
+ } else {
+ DEBUG(5, ("auth_get_challenge: sucessfully got challenge from module %s\n", auth_method->name));
+ auth_context->challenge = challenge;
+ challenge_set_by = auth_method->name;
+ auth_context->challenge_set_method = auth_method;
+ }
+ talloc_destroy(mem_ctx);
+ }
+
+ if (!challenge_set_by) {
+ uchar chal[8];
+
+ generate_random_buffer(chal, sizeof(chal), False);
+ auth_context->challenge = data_blob_talloc(auth_context->mem_ctx,
+ chal, sizeof(chal));
+
+ challenge_set_by = "random";
+ }
+
+ DEBUG(5, ("auth_context challenge created by %s\n", challenge_set_by));
+ DEBUG(5, ("challenge is: \n"));
+ dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
+
+ SMB_ASSERT(auth_context->challenge.length == 8);
+
+ auth_context->challenge_set_by=challenge_set_by;
+
+ return auth_context->challenge.data;
+}
+
+
+/**
+ * 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_netbios_alias_or_name(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_info Supplies the challenges and some other data.
+ * Must be created with make_auth_info(), and the challenges should be
+ * filled in, either at creation or by calling the challenge geneation
+ * function auth_get_challenge().
+ *
+ * @param server_info If successful, contains information about the authenticaion,
+ * including a SAM_ACCOUNT struct describing the user.
+ *
+ * @return An NTSTATUS with NT_STATUS_OK or an appropriate error.
+ *
+ **/
+
+static NTSTATUS check_ntlm_password(const struct auth_context *auth_context,
+ const struct auth_usersupplied_info *user_info,
+ struct auth_serversupplied_info **server_info)
+{
+
+ NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
+ const char *pdb_username;
+ auth_methods *auth_method;
+ TALLOC_CTX *mem_ctx;
+
+ if (!user_info || !auth_context || !server_info) {
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ DEBUG(3, ("check_password: Checking password for unmapped user [%s]\\[%s]@[%s] with the new password interface\n",
+ user_info->client_domain.str, user_info->smb_name.str, user_info->wksta_name.str));
+
+ DEBUG(3, ("check_password: mapped user is: [%s]\\[%s]@[%s]\n",
+ user_info->domain.str, user_info->internal_username.str, user_info->wksta_name.str));
+ if (auth_context->challenge_set_by) {
+ DEBUG(10, ("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",
+ user_info->lm_resp.length, user_info->nt_resp.length));
+ DEBUG(100, ("lm:\n"));
+ dump_data(100, user_info->lm_resp.data, user_info->lm_resp.length);
+ DEBUG(100, ("nt:\n"));
+ dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
+#endif
+
+ /* This needs to be sorted: If it doesn't match, what should we do? */
+ if (!check_domain_match(user_info->smb_name.str, user_info->domain.str)) {
+ return NT_STATUS_LOGON_FAILURE;
+ }
+
+ for (auth_method = auth_context->auth_method_list;auth_method; auth_method = auth_method->next)
+ {
+ mem_ctx = talloc_init_named("%s authentication for user %s\\%s", auth_method->name,
+ user_info->domain.str, user_info->smb_name.str);
+
+ nt_status = auth_method->auth(auth_context, auth_method->private_data, mem_ctx, user_info, server_info);
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(3, ("check_password: %s authentication for user [%s] suceeded\n",
+ auth_method->name, user_info->smb_name.str));
+ } else {
+ DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n",
+ auth_method->name, user_info->smb_name.str, nt_errstr(nt_status)));
+ }
+
+ talloc_destroy(mem_ctx);
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ break;
+ }
+ }
+
+ /* This is one of the few places the *relies* (rather than just sets defaults
+ on the value of lp_security(). This needs to change. A new paramater
+ perhaps? */
+ if (lp_security() >= SEC_SERVER) {
+ smb_user_control(user_info, *server_info, nt_status);
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ pdb_username = pdb_get_username((*server_info)->sam_account);
+ if (!(*server_info)->guest) {
+ /* We might not be root if we are an RPC call */
+ become_root();
+ nt_status = smb_pam_accountcheck(pdb_username);
+ unbecome_root();
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(5, ("check_password: PAM Account for user [%s] suceeded\n",
+ pdb_username));
+ } else {
+ DEBUG(3, ("check_password: PAM Account for user [%s] FAILED with error %s\n",
+ pdb_username, nt_errstr(nt_status)));
+ }
+ }
+
+ if (NT_STATUS_IS_OK(nt_status)) {
+ DEBUG((*server_info)->guest ? 5 : 2,
+ ("check_password: %sauthenticaion for user [%s] -> [%s] -> [%s] suceeded\n",
+ (*server_info)->guest ? "guest " : "",
+ user_info->smb_name.str,
+ user_info->internal_username.str,
+ pdb_username));
+ }
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status)) {
+ DEBUG(2, ("check_password: Authenticaion for user [%s] -> [%s] FAILED with error %s\n",
+ user_info->smb_name.str, user_info->internal_username.str,
+ nt_errstr(nt_status)));
+ ZERO_STRUCTP(server_info);
+ }
+ return nt_status;
+}
+
+/***************************************************************************
+ Clear out a auth_context, and destroy the attached TALLOC_CTX
+***************************************************************************/
+
+static void free_auth_context(struct auth_context **auth_context)
+{
+ if (*auth_context != NULL) {
+ talloc_destroy((*auth_context)->mem_ctx);
+ }
+ *auth_context = NULL;
+}
+
+/***************************************************************************
+ Make a auth_info struct
+***************************************************************************/
+
+static NTSTATUS make_auth_context(struct auth_context **auth_context)
+{
+ TALLOC_CTX *mem_ctx;
+
+ mem_ctx = talloc_init_named("authentication context");
+
+ *auth_context = talloc(mem_ctx, sizeof(**auth_context));
+ if (!*auth_context) {
+ DEBUG(0,("make_auth_context: talloc failed!\n"));
+ talloc_destroy(mem_ctx);
+ return NT_STATUS_NO_MEMORY;
+ }
+ ZERO_STRUCTP(*auth_context);
+
+ (*auth_context)->mem_ctx = mem_ctx;
+ (*auth_context)->check_ntlm_password = check_ntlm_password;
+ (*auth_context)->get_ntlm_challenge = get_ntlm_challenge;
+ (*auth_context)->free = free_auth_context;
+
+ return NT_STATUS_OK;
+}
+
+/***************************************************************************
+ Make a auth_info struct for the auth subsystem
+***************************************************************************/
+
+static NTSTATUS make_auth_context_text_list(struct auth_context **auth_context, char **text_list)
+{
+ auth_methods *list = NULL;
+ auth_methods *t = NULL;
+ auth_methods *tmp;
+ int i;
+ NTSTATUS nt_status;
+
+ if (!text_list) {
+ DEBUG(2,("No auth method list!?\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context(auth_context))) {
+ return nt_status;
+ }
+
+ for (;*text_list; text_list++)
+ {
+ DEBUG(5,("Attempting to find an auth method to match %s\n", *text_list));
+ for (i = 0; builtin_auth_init_functions[i].name; i++)
+ {
+ if (strequal(builtin_auth_init_functions[i].name, *text_list))
+ {
+ DEBUG(5,("Found auth method %s (at pos %d)\n", *text_list, i));
+ if (builtin_auth_init_functions[i].init(*auth_context, &t)) {
+ DEBUG(5,("auth method %s has a valid init\n", *text_list));
+ t->name = builtin_auth_init_functions[i].name;
+ DLIST_ADD_END(list, t, tmp);
+ } else {
+ DEBUG(0,("auth method %s did not correctly init\n", *text_list));
+ }
+ break;
+ }
+ }
+ }
+
+ (*auth_context)->auth_method_list = list;
+
+ return nt_status;
+}
+
+/***************************************************************************
+ Make a auth_context struct for the auth subsystem
+***************************************************************************/
+
+NTSTATUS make_auth_context_subsystem(struct auth_context **auth_context)
+{
+ char **auth_method_list = NULL;
+ NTSTATUS nt_status;
+
+ if (lp_auth_methods() && !lp_list_copy(&auth_method_list, lp_auth_methods())) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (auth_method_list == NULL) {
+ switch (lp_security())
+ {
+ case SEC_DOMAIN:
+ DEBUG(5,("Making default auth method list for security=domain\n"));
+ auth_method_list = lp_list_make("guest samstrict ntdomain");
+ break;
+ case SEC_SERVER:
+ DEBUG(5,("Making default auth method list for security=server\n"));
+ auth_method_list = lp_list_make("guest samstrict smbserver");
+ break;
+ case SEC_USER:
+ if (lp_encrypted_passwords()) {
+ DEBUG(5,("Making default auth method list for security=user, encrypt passwords = yes\n"));
+ auth_method_list = lp_list_make("guest sam");
+ } else {
+ DEBUG(5,("Making default auth method list for security=user, encrypt passwords = no\n"));
+ auth_method_list = lp_list_make("guest unix");
+ }
+ break;
+ case SEC_SHARE:
+ if (lp_encrypted_passwords()) {
+ DEBUG(5,("Making default auth method list for security=share, encrypt passwords = yes\n"));
+ auth_method_list = lp_list_make("guest sam");
+ } else {
+ DEBUG(5,("Making default auth method list for security=share, encrypt passwords = no\n"));
+ auth_method_list = lp_list_make("guest unix");
+ }
+ break;
+ case SEC_ADS:
+ DEBUG(5,("Making default auth method list for security=ADS\n"));
+ auth_method_list = lp_list_make("guest samstrict ads ntdomain");
+ break;
+ default:
+ DEBUG(5,("Unknown auth method!\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ } else {
+ DEBUG(5,("Using specified auth order\n"));
+ }
+
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context_text_list(auth_context, auth_method_list))) {
+ lp_list_free(&auth_method_list);
+ return nt_status;
+ }
+
+ lp_list_free(&auth_method_list);
+ return nt_status;
+}
+
+/***************************************************************************
+ Make a auth_info struct with a random challenge
+***************************************************************************/
+
+NTSTATUS make_auth_context_random(struct auth_context **auth_context)
+{
+ uchar chal[8];
+ NTSTATUS nt_status;
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
+ return nt_status;
+ }
+
+ generate_random_buffer(chal, sizeof(chal), False);
+ (*auth_context)->challenge = data_blob(chal, sizeof(chal));
+
+ (*auth_context)->challenge_set_by = "random";
+
+ return nt_status;
+}
+
+/***************************************************************************
+ Make a auth_info struct with a fixed challenge
+***************************************************************************/
+
+NTSTATUS make_auth_context_fixed(struct auth_context **auth_context, uchar chal[8])
+{
+ NTSTATUS nt_status;
+ if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(auth_context))) {
+ return nt_status;
+ }
+
+ (*auth_context)->challenge = data_blob(chal, 8);
+ return nt_status;
+}
+
+
generated by cgit (git 2.34.1) at 2024-11-10 07:07:37 +0000