diff options
Diffstat (limited to 'source3/auth/auth_server.c')
| -rw-r--r-- | source3/auth/auth_server.c | 487 |
1 files changed, 0 insertions, 487 deletions
diff --git a/source3/auth/auth_server.c b/source3/auth/auth_server.c deleted file mode 100644 index 3bd69cda4d..0000000000 --- a/source3/auth/auth_server.c +++ /dev/null @@ -1,487 +0,0 @@ -/* - Unix SMB/CIFS implementation. - Authenticate to a remote server - Copyright (C) Andrew Tridgell 1992-1998 - Copyright (C) Andrew Bartlett 2001 - - 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 "system/passwd.h" -#include "smbd/smbd.h" -#include "libsmb/libsmb.h" - -#undef DBGC_CLASS -#define DBGC_CLASS DBGC_AUTH - -extern userdom_struct current_user_info; - -/**************************************************************************** - Support for server level security. -****************************************************************************/ - -static struct cli_state *server_cryptkey(TALLOC_CTX *mem_ctx) -{ - struct cli_state *cli = NULL; - char *desthost = NULL; - struct sockaddr_storage dest_ss; - const char *p; - char *pserver = NULL; - bool connected_ok = False; - struct named_mutex *mutex = NULL; - NTSTATUS status; - /* security = server just can't function with spnego */ - int flags = CLI_FULL_CONNECTION_DONT_SPNEGO; - uint16_t sec_mode = 0; - - pserver = talloc_strdup(mem_ctx, lp_passwordserver()); - p = pserver; - - while(next_token_talloc(mem_ctx, &p, &desthost, LIST_SEP)) { - - desthost = talloc_sub_basic(mem_ctx, - current_user_info.smb_name, - current_user_info.domain, - desthost); - if (!desthost) { - return NULL; - } - strupper_m(desthost); - - if (strequal(desthost, myhostname())) { - DEBUG(1,("Password server loop - disabling " - "password server %s\n", desthost)); - continue; - } - - if(!resolve_name( desthost, &dest_ss, 0x20, false)) { - DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost)); - continue; - } - - if (ismyaddr((struct sockaddr *)(void *)&dest_ss)) { - DEBUG(1,("Password server loop - disabling password server %s\n",desthost)); - continue; - } - - /* we use a mutex to prevent two connections at once - when a - Win2k PDC get two connections where one hasn't completed a - session setup yet it will send a TCP reset to the first - connection (tridge) */ - - mutex = grab_named_mutex(talloc_tos(), desthost, 10); - if (mutex == NULL) { - return NULL; - } - - status = cli_connect_nb(desthost, &dest_ss, 0, 0x20, - lp_netbios_name(), SMB_SIGNING_DEFAULT, - flags, &cli); - if (NT_STATUS_IS_OK(status)) { - DEBUG(3,("connected to password server %s\n",desthost)); - connected_ok = True; - break; - } - DEBUG(10,("server_cryptkey: failed to connect to server %s. Error %s\n", - desthost, nt_errstr(status) )); - TALLOC_FREE(mutex); - } - - if (!connected_ok) { - DEBUG(0,("password server not available\n")); - return NULL; - } - - DEBUG(3,("got session\n")); - - status = cli_negprot(cli, PROTOCOL_NT1); - - if (!NT_STATUS_IS_OK(status)) { - TALLOC_FREE(mutex); - DEBUG(1, ("%s rejected the negprot: %s\n", - desthost, nt_errstr(status))); - cli_shutdown(cli); - return NULL; - } - - sec_mode = cli_state_security_mode(cli); - if (cli_state_protocol(cli) < PROTOCOL_LANMAN2 || - !(sec_mode & NEGOTIATE_SECURITY_USER_LEVEL)) { - TALLOC_FREE(mutex); - DEBUG(1,("%s isn't in user level security mode\n",desthost)); - cli_shutdown(cli); - return NULL; - } - - /* Get the first session setup done quickly, to avoid silly - Win2k bugs. (The next connection to the server will kill - this one... - */ - - status = cli_session_setup(cli, "", "", 0, "", 0, ""); - if (!NT_STATUS_IS_OK(status)) { - TALLOC_FREE(mutex); - DEBUG(0,("%s rejected the initial session setup (%s)\n", - desthost, nt_errstr(status))); - cli_shutdown(cli); - return NULL; - } - - TALLOC_FREE(mutex); - - DEBUG(3,("password server OK\n")); - - return cli; -} - -struct server_security_state { - struct cli_state *cli; -}; - -/**************************************************************************** - Send a 'keepalive' packet down the cli pipe. -****************************************************************************/ - -static bool send_server_keepalive(const struct timeval *now, - void *private_data) -{ - struct server_security_state *state = talloc_get_type_abort( - private_data, struct server_security_state); - NTSTATUS status; - unsigned char garbage[16]; - - if (!cli_state_is_connected(state->cli)) { - return false; - } - - /* Ping the server to keep the connection alive using SMBecho. */ - memset(garbage, 0xf0, sizeof(garbage)); - status = cli_echo(state->cli, 1, data_blob_const(garbage, sizeof(garbage))); - if (NT_STATUS_IS_OK(status)) { - return true; - } - - DEBUG(2,("send_server_keepalive: password server SMBecho failed: %s\n", - nt_errstr(status))); - cli_shutdown(state->cli); - state->cli = NULL; - return false; -} - -static int destroy_server_security(struct server_security_state *state) -{ - if (state->cli) { - cli_shutdown(state->cli); - } - return 0; -} - -static struct server_security_state *make_server_security_state(struct cli_state *cli) -{ - struct server_security_state *result; - - if (!(result = talloc(NULL, struct server_security_state))) { - DEBUG(0, ("talloc failed\n")); - cli_shutdown(cli); - return NULL; - } - - result->cli = cli; - talloc_set_destructor(result, destroy_server_security); - - if (lp_keepalive() != 0) { - struct timeval interval; - interval.tv_sec = lp_keepalive(); - interval.tv_usec = 0; - - if (event_add_idle(server_event_context(), result, interval, - "server_security_keepalive", - send_server_keepalive, - result) == NULL) { - DEBUG(0, ("event_add_idle failed\n")); - TALLOC_FREE(result); - return NULL; - } - } - - return result; -} - -/**************************************************************************** - Get the challenge out of a password server. -****************************************************************************/ - -static DATA_BLOB auth_get_challenge_server(const struct auth_context *auth_context, - void **my_private_data, - TALLOC_CTX *mem_ctx) -{ - struct cli_state *cli = server_cryptkey(mem_ctx); - - if (cli) { - uint16_t sec_mode = cli_state_security_mode(cli); - const uint8_t *server_challenge = cli_state_server_challenge(cli); - - DEBUG(3,("using password server validation\n")); - - if ((sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) { - /* We can't work with unencrypted password servers - unless 'encrypt passwords = no' */ - DEBUG(5,("make_auth_info_server: Server is unencrypted, no challenge available..\n")); - - /* However, it is still a perfectly fine connection - to pass that unencrypted password over */ - *my_private_data = - (void *)make_server_security_state(cli); - return data_blob_null; - } - - if (!(*my_private_data = (void *)make_server_security_state(cli))) { - return data_blob(NULL,0); - } - - /* The return must be allocated on the caller's mem_ctx, as our own will be - destoyed just after the call. */ - return data_blob_talloc(discard_const_p(TALLOC_CTX, auth_context), server_challenge ,8); - } else { - return data_blob_null; - } -} - - -/**************************************************************************** - Check for a valid username and password in security=server mode. - - Validate a password with the password server. -****************************************************************************/ - -static NTSTATUS check_smbserver_security(const struct auth_context *auth_context, - void *my_private_data, - TALLOC_CTX *mem_ctx, - const struct auth_usersupplied_info *user_info, - struct auth_serversupplied_info **server_info) -{ - struct server_security_state *state = NULL; - struct cli_state *cli = NULL; - static bool tested_password_server = False; - static bool bad_password_server = False; - NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED; - bool locally_made_cli = False; - uint16_t sec_mode = 0; - - DEBUG(10, ("check_smbserver_security: Check auth for: [%s]\n", - user_info->mapped.account_name)); - - if (my_private_data == NULL) { - DEBUG(10,("check_smbserver_security: " - "password server is not connected\n")); - return NT_STATUS_LOGON_FAILURE; - } - - state = talloc_get_type_abort(my_private_data, struct server_security_state); - cli = state->cli; - - if (cli) { - } else { - cli = server_cryptkey(mem_ctx); - locally_made_cli = True; - } - - if (!cli_state_is_connected(cli)) { - DEBUG(1,("password server is not connected (cli not initialised)\n")); - return NT_STATUS_LOGON_FAILURE; - } - - sec_mode = cli_state_security_mode(cli); - if ((sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) == 0) { - if (user_info->password_state != AUTH_PASSWORD_PLAIN) { - DEBUG(1,("password server %s is plaintext, but we are encrypted. This just can't work :-(\n", cli_state_remote_name(cli))); - return NT_STATUS_LOGON_FAILURE; - } - } else { - const uint8_t *server_challenge = cli_state_server_challenge(cli); - - if (memcmp(server_challenge, auth_context->challenge.data, 8) != 0) { - DEBUG(1,("the challenge that the password server (%s) supplied us is not the one we gave our client. This just can't work :-(\n", cli_state_remote_name(cli))); - return NT_STATUS_LOGON_FAILURE; - } - } - - /* - * Attempt a session setup with a totally incorrect password. - * If this succeeds with the guest bit *NOT* set then the password - * server is broken and is not correctly setting the guest bit. We - * need to detect this as some versions of NT4.x are broken. JRA. - */ - - /* I sure as hell hope that there aren't servers out there that take - * NTLMv2 and have this bug, as we don't test for that... - * - abartlet@samba.org - */ - - if ((!tested_password_server) && (lp_paranoid_server_security())) { - unsigned char badpass[24]; - char *baduser = NULL; - - memset(badpass, 0x1f, sizeof(badpass)); - - if((user_info->password.response.nt.length == sizeof(badpass)) && - !memcmp(badpass, user_info->password.response.nt.data, sizeof(badpass))) { - /* - * Very unlikely, our random bad password is the same as the users - * password. - */ - memset(badpass, badpass[0]+1, sizeof(badpass)); - } - - baduser = talloc_asprintf(mem_ctx, - "%s%s", - INVALID_USER_PREFIX, - lp_netbios_name()); - if (!baduser) { - return NT_STATUS_NO_MEMORY; - } - - if (NT_STATUS_IS_OK(cli_session_setup(cli, baduser, - (char *)badpass, - sizeof(badpass), - (char *)badpass, - sizeof(badpass), - user_info->mapped.domain_name))) { - - /* - * We connected to the password server so we - * can say we've tested it. - */ - tested_password_server = True; - - if (!cli->is_guestlogin) { - DEBUG(0,("server_validate: password server %s allows users as non-guest \ -with a bad password.\n", cli_state_remote_name(cli))); - DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \ -use this machine as the password server.\n")); - cli_ulogoff(cli); - - /* - * Password server has the bug. - */ - bad_password_server = True; - return NT_STATUS_LOGON_FAILURE; - } - cli_ulogoff(cli); - } - } else { - - /* - * We have already tested the password server. - * Fail immediately if it has the bug. - */ - - if(bad_password_server) { - DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \ -with a bad password.\n", cli_state_remote_name(cli))); - DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \ -use this machine as the password server.\n")); - return NT_STATUS_LOGON_FAILURE; - } - } - - /* - * Now we know the password server will correctly set the guest bit, or is - * not guest enabled, we can try with the real password. - */ - switch (user_info->password_state) { - case AUTH_PASSWORD_PLAIN: - /* Plaintext available */ - nt_status = cli_session_setup( - cli, user_info->client.account_name, - user_info->password.plaintext, - strlen(user_info->password.plaintext), - NULL, 0, user_info->mapped.domain_name); - break; - - /* currently the hash values include a challenge-response as well */ - case AUTH_PASSWORD_HASH: - case AUTH_PASSWORD_RESPONSE: - nt_status = cli_session_setup( - cli, user_info->client.account_name, - (char *)user_info->password.response.lanman.data, - user_info->password.response.lanman.length, - (char *)user_info->password.response.nt.data, - user_info->password.response.nt.length, - user_info->mapped.domain_name); - break; - default: - DEBUG(0,("user_info constructed for user '%s' was invalid - password_state=%u invalid.\n",user_info->mapped.account_name, user_info->password_state)); - nt_status = NT_STATUS_INTERNAL_ERROR; - } - - if (!NT_STATUS_IS_OK(nt_status)) { - DEBUG(1,("password server %s rejected the password: %s\n", - cli_state_remote_name(cli), nt_errstr(nt_status))); - } - - /* if logged in as guest then reject */ - if (cli->is_guestlogin) { - DEBUG(1,("password server %s gave us guest only\n", - cli_state_remote_name(cli))); - nt_status = NT_STATUS_LOGON_FAILURE; - } - - cli_ulogoff(cli); - - if (NT_STATUS_IS_OK(nt_status)) { - char *real_username = NULL; - struct passwd *pass = NULL; - - if ( (pass = smb_getpwnam(talloc_tos(), user_info->mapped.account_name, - &real_username, True )) != NULL ) - { - nt_status = make_server_info_pw(server_info, pass->pw_name, pass); - TALLOC_FREE(pass); - TALLOC_FREE(real_username); - } - else - { - nt_status = NT_STATUS_NO_SUCH_USER; - } - } - - if (locally_made_cli) { - cli_shutdown(cli); - } - - return(nt_status); -} - -static NTSTATUS auth_init_smbserver(struct auth_context *auth_context, const char* param, auth_methods **auth_method) -{ - struct auth_methods *result; - - result = talloc_zero(auth_context, struct auth_methods); - if (result == NULL) { - return NT_STATUS_NO_MEMORY; - } - result->name = "smbserver"; - result->auth = check_smbserver_security; - result->get_chal = auth_get_challenge_server; - - *auth_method = result; - return NT_STATUS_OK; -} - -NTSTATUS auth_server_init(void) -{ - return smb_register_auth(AUTH_INTERFACE_VERSION, "smbserver", auth_init_smbserver); -} |