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6ce72a01ab
The plan is to have users_struct as some kind of low level abstraction for a smb1/smb2 session, that can be used by SMB_VFS modules. metze
349 lines
9.7 KiB
C
349 lines
9.7 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 Tridgell 1992-1998
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Copyright (C) Jeremy Allison 2007.
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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 "system/passwd.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "../librpc/gen_ndr/netlogon.h"
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#include "auth.h"
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#include "../libcli/security/security.h"
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/* Fix up prototypes for OSX 10.4, where they're missing */
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#ifndef HAVE_SETNETGRENT_PROTOTYPE
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extern int setnetgrent(const char* netgroup);
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#endif
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#ifndef HAVE_GETNETGRENT_PROTOTYPE
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extern int getnetgrent(char **host, char **user, char **domain);
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#endif
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#ifndef HAVE_ENDNETGRENT_PROTOTYPE
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extern void endnetgrent(void);
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#endif
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enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
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SERVER_ALLOCATED_REQUIRED_NO,
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SERVER_ALLOCATED_REQUIRED_ANY};
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static user_struct *get_valid_user_struct_internal(
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struct smbd_server_connection *sconn,
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uint16 vuid,
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enum server_allocated_state server_allocated)
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{
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user_struct *usp;
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int count=0;
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if (vuid == UID_FIELD_INVALID)
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return NULL;
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usp=sconn->users;
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for (;usp;usp=usp->next,count++) {
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if (vuid == usp->vuid) {
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switch (server_allocated) {
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case SERVER_ALLOCATED_REQUIRED_YES:
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if (usp->session_info == NULL) {
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continue;
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}
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break;
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case SERVER_ALLOCATED_REQUIRED_NO:
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if (usp->session_info != NULL) {
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continue;
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}
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case SERVER_ALLOCATED_REQUIRED_ANY:
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break;
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}
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if (count > 10) {
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DLIST_PROMOTE(sconn->users, usp);
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}
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return usp;
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}
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}
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return NULL;
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}
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/****************************************************************************
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Check if a uid has been validated, and return an pointer to the user_struct
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if it has. NULL if not. vuid is biased by an offset. This allows us to
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tell random client vuid's (normally zero) from valid vuids.
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****************************************************************************/
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user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
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uint16 vuid)
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{
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return get_valid_user_struct_internal(sconn, vuid,
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SERVER_ALLOCATED_REQUIRED_YES);
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}
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bool is_partial_auth_vuid(struct smbd_server_connection *sconn, uint16 vuid)
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{
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return (get_partial_auth_user_struct(sconn, vuid) != NULL);
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}
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/****************************************************************************
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Get the user struct of a partial NTLMSSP login
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****************************************************************************/
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user_struct *get_partial_auth_user_struct(struct smbd_server_connection *sconn,
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uint16 vuid)
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{
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return get_valid_user_struct_internal(sconn, vuid,
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SERVER_ALLOCATED_REQUIRED_NO);
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}
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/****************************************************************************
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Invalidate a uid.
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****************************************************************************/
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void invalidate_vuid(struct smbd_server_connection *sconn, uint16 vuid)
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{
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user_struct *vuser = NULL;
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vuser = get_valid_user_struct_internal(sconn, vuid,
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SERVER_ALLOCATED_REQUIRED_ANY);
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if (vuser == NULL) {
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return;
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}
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session_yield(vuser);
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if (vuser->gensec_security) {
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TALLOC_FREE(vuser->gensec_security);
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}
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DLIST_REMOVE(sconn->users, vuser);
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SMB_ASSERT(sconn->num_users > 0);
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sconn->num_users--;
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/* clear the vuid from the 'cache' on each connection, and
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from the vuid 'owner' of connections */
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conn_clear_vuid_caches(sconn, vuid);
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TALLOC_FREE(vuser);
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}
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/****************************************************************************
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Invalidate all vuid entries for this process.
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****************************************************************************/
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void invalidate_all_vuids(struct smbd_server_connection *sconn)
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{
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if (sconn->using_smb2) {
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return;
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}
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while (sconn->users != NULL) {
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invalidate_vuid(sconn, sconn->users->vuid);
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}
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}
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static void increment_next_vuid(uint16_t *vuid)
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{
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*vuid += 1;
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/* Check for vuid wrap. */
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if (*vuid == UID_FIELD_INVALID) {
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*vuid = VUID_OFFSET;
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}
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}
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/****************************************************
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Create a new partial auth user struct.
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*****************************************************/
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int register_initial_vuid(struct smbd_server_connection *sconn)
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{
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user_struct *vuser;
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/* Limit allowed vuids to 16bits - VUID_OFFSET. */
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if (sconn->num_users >= 0xFFFF-VUID_OFFSET) {
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return UID_FIELD_INVALID;
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}
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if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
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DEBUG(0,("register_initial_vuid: "
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"Failed to talloc users struct!\n"));
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return UID_FIELD_INVALID;
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}
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/* Allocate a free vuid. Yes this is a linear search... */
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while( get_valid_user_struct_internal(sconn,
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sconn->smb1.sessions.next_vuid,
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SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
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increment_next_vuid(&sconn->smb1.sessions.next_vuid);
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}
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DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
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(unsigned int)sconn->smb1.sessions.next_vuid ));
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vuser->vuid = sconn->smb1.sessions.next_vuid;
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/*
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* This happens in an unfinished NTLMSSP session setup. We
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* need to allocate a vuid between the first and second calls
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* to NTLMSSP.
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*/
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increment_next_vuid(&sconn->smb1.sessions.next_vuid);
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sconn->num_users++;
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DLIST_ADD(sconn->users, vuser);
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return vuser->vuid;
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}
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int register_homes_share(const char *username)
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{
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int result;
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struct passwd *pwd;
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result = lp_servicenumber(username);
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if (result != -1) {
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DEBUG(3, ("Using static (or previously created) service for "
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"user '%s'; path = '%s'\n", username,
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lp_pathname(result)));
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return result;
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}
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pwd = Get_Pwnam_alloc(talloc_tos(), username);
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if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
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DEBUG(3, ("No home directory defined for user '%s'\n",
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username));
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TALLOC_FREE(pwd);
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return -1;
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}
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DEBUG(3, ("Adding homes service for user '%s' using home directory: "
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"'%s'\n", username, pwd->pw_dir));
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result = add_home_service(username, username, pwd->pw_dir);
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TALLOC_FREE(pwd);
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return result;
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}
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/**
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* register that a valid login has been performed, establish 'session'.
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* @param session_info The token returned from the authentication process.
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* (now 'owned' by register_existing_vuid)
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*
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* @param session_key The User session key for the login session (now also
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* 'owned' by register_existing_vuid)
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*
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* @param respose_blob The NT challenge-response, if available. (May be
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* freed after this call)
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*
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* @param smb_name The untranslated name of the user
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*
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* @return Newly allocated vuid, biased by an offset. (This allows us to
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* tell random client vuid's (normally zero) from valid vuids.)
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*
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*/
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int register_existing_vuid(struct smbd_server_connection *sconn,
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uint16 vuid,
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struct auth_session_info *session_info,
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DATA_BLOB response_blob)
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{
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user_struct *vuser;
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bool guest = security_session_user_level(session_info, NULL) < SECURITY_USER;
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vuser = get_partial_auth_user_struct(sconn, vuid);
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if (!vuser) {
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goto fail;
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}
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/* Use this to keep tabs on all our info from the authentication */
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vuser->session_info = talloc_move(vuser, &session_info);
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/* Make clear that we require the optional unix_token and unix_info in the source3 code */
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SMB_ASSERT(vuser->session_info->unix_token);
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SMB_ASSERT(vuser->session_info->unix_info);
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DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
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(unsigned int)vuser->session_info->unix_token->uid,
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(unsigned int)vuser->session_info->unix_token->gid,
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vuser->session_info->unix_info->unix_name,
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vuser->session_info->unix_info->sanitized_username,
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vuser->session_info->info->domain_name,
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guest));
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DEBUG(3, ("register_existing_vuid: User name: %s\t"
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"Real name: %s\n", vuser->session_info->unix_info->unix_name,
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vuser->session_info->info->full_name));
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if (!vuser->session_info->security_token) {
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DEBUG(1, ("register_existing_vuid: session_info does not "
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"contain a user_token - cannot continue\n"));
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goto fail;
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}
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/* Make clear that we require the optional unix_token in the source3 code */
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SMB_ASSERT(vuser->session_info->unix_token);
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DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
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"and will be vuid %u\n", (int)vuser->session_info->unix_token->uid,
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vuser->session_info->unix_info->unix_name, vuser->vuid));
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if (!session_claim(sconn, vuser)) {
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DEBUG(1, ("register_existing_vuid: Failed to claim session "
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"for vuid=%d\n",
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vuser->vuid));
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goto fail;
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}
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/* Register a home dir service for this user if
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(a) This is not a guest connection,
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(b) we have a home directory defined
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(c) there s not an existing static share by that name
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If a share exists by this name (autoloaded or not) reuse it . */
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vuser->homes_snum = -1;
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if (!guest) {
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vuser->homes_snum = register_homes_share(
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vuser->session_info->unix_info->unix_name);
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}
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if (srv_is_signing_negotiated(sconn) &&
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!guest) {
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/* Try and turn on server signing on the first non-guest
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* sessionsetup. */
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srv_set_signing(sconn,
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vuser->session_info->session_key,
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response_blob);
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}
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/* fill in the current_user_info struct */
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set_current_user_info(
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vuser->session_info->unix_info->sanitized_username,
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vuser->session_info->unix_info->unix_name,
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vuser->session_info->info->domain_name);
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return vuser->vuid;
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fail:
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if (vuser) {
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invalidate_vuid(sconn, vuid);
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}
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return UID_FIELD_INVALID;
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}
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