/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ Unix SMB/CIFS implementation.
Password and authentication handling
- Copyright (C) Andrew Tridgell 1992-2000
- Copyright (C) Luke Kenneth Casson Leighton 1996-2000
- Copyright (C) Andrew Bartlett 2001
+ 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
#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 },
+ { "winbind", auth_init_winbind },
+#ifdef DEVELOPER
+ { "name_to_ntstatus", auth_init_name_to_ntstatus },
+#endif
+ { NULL, NULL}
+};
+
/****************************************************************************
- Check user is in correct domain if required
+ Try to get a challenge out of the various authenticaion modules.
+ Returns a const char of length 8 bytes.
****************************************************************************/
-static BOOL check_domain_match(char *user, char *domain)
+static const uint8 *get_ntlm_challenge(struct auth_context *auth_context)
{
- /*
- * 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(lp_workgroup(), domain) || strequal("", domain))) {
- DEBUG(1, ("check_domain_match: Attempt to connect as user %s from domain %s denied.\n", user, domain));
- return False;
- } else {
- return True;
- }
-}
+ DATA_BLOB challenge = data_blob(NULL, 0);
+ char *challenge_set_by = NULL;
+ auth_methods *auth_method;
+ TALLOC_CTX *mem_ctx;
-/****************************************************************************
- Check a users password, as given in the user-info struct and return various
- interesting details in the server_info struct.
+ if (auth_context->challenge.length) {
+ DEBUG(5, ("get_ntlm_challenge (auth subsystem): returning previous challenge (normal)\n"));
+ return auth_context->challenge.data;
+ }
- This functions does NOT need to be in a become_root()/unbecome_root() pair
- as it makes the calls itself when needed.
+ 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;
+ }
- The return value takes precedence over the contents of the server_info
- struct. When the return is other than NT_STATUS_NOPROBLEMO the contents
- of that structure is undefined.
+ 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;
+ }
+}
-NTSTATUS check_password(const auth_usersupplied_info *user_info,
- const auth_authsupplied_info *auth_info,
- auth_serversupplied_info **server_info)
+/**
+ * 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_info || !server_info) {
+ if (!user_info || !auth_context || !server_info) {
return NT_STATUS_LOGON_FAILURE;
}
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));
- DEBUG(10, ("auth_info challenge created by %s\n", auth_info->challenge_set_by));
+ 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_info)->challenge.data, (auth_info)->challenge.length);
+ 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",
dump_data(100, user_info->nt_resp.data, user_info->nt_resp.length);
#endif
- for (auth_method = auth_info->auth_method_list;auth_method; auth_method = auth_method->next)
+ /* 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)
{
- nt_status = auth_method->auth(auth_method->private_data, user_info, auth_info, server_info);
+ 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));
DEBUG(5, ("check_password: %s authentication for user [%s] FAILED with error %s\n",
auth_method->name, user_info->smb_name.str, get_nt_error_msg(nt_status)));
}
-
+
+ talloc_destroy(mem_ctx);
+
if (NT_STATUS_IS_OK(nt_status)) {
break;
}
}
- /* 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;
- }
-
-
/* 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? */
ZERO_STRUCTP(server_info);
}
return nt_status;
-
}
-/****************************************************************************
- Squash an NT_STATUS return in line with requirements for unauthenticated
- connections. (session setups in particular)
-****************************************************************************/
+/***************************************************************************
+ Clear out a auth_context, and destroy the attached TALLOC_CTX
+***************************************************************************/
-NTSTATUS nt_status_squash(NTSTATUS nt_status)
+static void free_auth_context(struct auth_context **auth_context)
{
- if NT_STATUS_IS_OK(nt_status) {
- return nt_status;
- } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
- /* Match WinXP and don't give the game away */
- return NT_STATUS_LOGON_FAILURE;
-
- } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
- /* Match WinXP and don't give the game away */
- return NT_STATUS_LOGON_FAILURE;
- } else {
- return nt_status;
- }
+ 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;
-/****************************************************************************
- COMPATABILITY INTERFACES:
- ***************************************************************************/
+ 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);
-/****************************************************************************
-check if a username/password is OK assuming the password is a 24 byte
-SMB hash
-return True if the password is correct, False otherwise
-****************************************************************************/
+ (*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;
+}
-static NTSTATUS pass_check_smb(char *smb_name,
- char *domain,
- DATA_BLOB lm_pwd,
- DATA_BLOB nt_pwd,
- DATA_BLOB plaintext_password,
- BOOL encrypted)
+/***************************************************************************
+ 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;
- auth_usersupplied_info *user_info = NULL;
- extern auth_authsupplied_info *negprot_global_auth_info;
- auth_serversupplied_info *server_info = NULL;
- if (encrypted) {
- make_user_info_for_reply_enc(&user_info, smb_name,
- domain,
- lm_pwd,
- nt_pwd,
- plaintext_password);
- nt_status = check_password(user_info, negprot_global_auth_info, &server_info);
- } else {
- auth_authsupplied_info *plaintext_auth_info = NULL;
- DATA_BLOB chal;
- if (!make_auth_info_subsystem(&plaintext_auth_info)) {
- return NT_STATUS_NO_MEMORY;
- }
- chal = auth_get_challenge(plaintext_auth_info);
-
- if (!make_user_info_for_reply(&user_info,
- smb_name, domain, chal.data,
- plaintext_password)) {
- return NT_STATUS_NO_MEMORY;
+ 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;
+ }
}
-
- nt_status = check_password(user_info, plaintext_auth_info, &server_info);
-
- data_blob_free(&chal);
- free_auth_info(&plaintext_auth_info);
- }
- free_user_info(&user_info);
- free_server_info(&server_info);
+ }
+
+ (*auth_context)->auth_method_list = list;
+
return nt_status;
}
-/****************************************************************************
-check if a username/password pair is OK either via the system password
-database or the encrypted SMB password database
-return True if the password is correct, False otherwise
-****************************************************************************/
-BOOL password_ok(char *smb_name, DATA_BLOB password_blob)
+/***************************************************************************
+ 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;
- DATA_BLOB null_password = data_blob(NULL, 0);
- extern BOOL global_encrypted_passwords_negotiated;
- BOOL encrypted = (global_encrypted_passwords_negotiated && password_blob.length == 24);
-
- if (encrypted) {
- /*
- * The password could be either NTLM or plain LM. Try NTLM first,
- * but fall-through as required.
- * NTLMv2 makes no sense here.
- */
- if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, password_blob, null_password, encrypted))) {
- return True;
- }
-
- if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), password_blob, null_password, null_password, encrypted))) {
- return True;
+ 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 {
- if (NT_STATUS_IS_OK(pass_check_smb(smb_name, lp_workgroup(), null_password, null_password, password_blob, encrypted))) {
- return True;
- }
+ 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
+***************************************************************************/
- return False;
+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;
}
git.samba.org / ira / wip.git / blobdiff