/* Unix SMB/CIFS implementation. Authentication utility functions Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Andrew Bartlett 2001 Copyright (C) Jeremy Allison 2000-2001 Copyright (C) Rafal Szczesniak 2002 Copyright (C) Volker Lendecke 2006 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" #undef DBGC_CLASS #define DBGC_CLASS DBGC_AUTH /**************************************************************************** Create a UNIX user on demand. ****************************************************************************/ static int smb_create_user(const char *domain, const char *unix_username, const char *homedir) { pstring add_script; int ret; pstrcpy(add_script, lp_adduser_script()); if (! *add_script) return -1; all_string_sub(add_script, "%u", unix_username, sizeof(pstring)); if (domain) all_string_sub(add_script, "%D", domain, sizeof(pstring)); if (homedir) all_string_sub(add_script, "%H", homedir, sizeof(pstring)); ret = smbrun(add_script,NULL); flush_pwnam_cache(); DEBUG(ret ? 0 : 3,("smb_create_user: Running the command `%s' gave %d\n",add_script,ret)); return ret; } /**************************************************************************** Create an auth_usersupplied_data structure ****************************************************************************/ static NTSTATUS make_user_info(auth_usersupplied_info **user_info, const char *smb_name, const char *internal_username, const char *client_domain, const char *domain, const char *wksta_name, DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd, DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd, DATA_BLOB *plaintext, BOOL encrypted) { DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name)); *user_info = SMB_MALLOC_P(auth_usersupplied_info); if (*user_info == NULL) { DEBUG(0,("malloc failed for user_info (size %lu)\n", (unsigned long)sizeof(*user_info))); return NT_STATUS_NO_MEMORY; } ZERO_STRUCTP(*user_info); DEBUG(5,("making strings for %s's user_info struct\n", internal_username)); (*user_info)->smb_name = SMB_STRDUP(smb_name); if ((*user_info)->smb_name == NULL) { free_user_info(user_info); return NT_STATUS_NO_MEMORY; } (*user_info)->internal_username = SMB_STRDUP(internal_username); if ((*user_info)->internal_username == NULL) { free_user_info(user_info); return NT_STATUS_NO_MEMORY; } (*user_info)->domain = SMB_STRDUP(domain); if ((*user_info)->domain == NULL) { free_user_info(user_info); return NT_STATUS_NO_MEMORY; } (*user_info)->client_domain = SMB_STRDUP(client_domain); if ((*user_info)->client_domain == NULL) { free_user_info(user_info); return NT_STATUS_NO_MEMORY; } (*user_info)->wksta_name = SMB_STRDUP(wksta_name); if ((*user_info)->wksta_name == NULL) { free_user_info(user_info); return NT_STATUS_NO_MEMORY; } DEBUG(5,("making blobs for %s's user_info struct\n", internal_username)); if (lm_pwd) (*user_info)->lm_resp = data_blob(lm_pwd->data, lm_pwd->length); if (nt_pwd) (*user_info)->nt_resp = data_blob(nt_pwd->data, nt_pwd->length); if (lm_interactive_pwd) (*user_info)->lm_interactive_pwd = data_blob(lm_interactive_pwd->data, lm_interactive_pwd->length); if (nt_interactive_pwd) (*user_info)->nt_interactive_pwd = data_blob(nt_interactive_pwd->data, nt_interactive_pwd->length); if (plaintext) (*user_info)->plaintext_password = data_blob(plaintext->data, plaintext->length); (*user_info)->encrypted = encrypted; (*user_info)->logon_parameters = 0; DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name)); return NT_STATUS_OK; } /**************************************************************************** Create an auth_usersupplied_data structure after appropriate mapping. ****************************************************************************/ NTSTATUS make_user_info_map(auth_usersupplied_info **user_info, const char *smb_name, const char *client_domain, const char *wksta_name, DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd, DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd, DATA_BLOB *plaintext, BOOL encrypted) { const char *domain; NTSTATUS result; BOOL was_mapped; fstring internal_username; fstrcpy(internal_username, smb_name); was_mapped = map_username(internal_username); DEBUG(5, ("make_user_info_map: Mapping user [%s]\\[%s] from workstation [%s]\n", client_domain, smb_name, wksta_name)); /* don't allow "" as a domain, fixes a Win9X bug where it doens't supply a domain for logon script 'net use' commands. */ if ( *client_domain ) domain = client_domain; else domain = lp_workgroup(); /* do what win2k does. Always map unknown domains to our own and let the "passdb backend" handle unknown users. */ if ( !is_trusted_domain(domain) && !strequal(domain, get_global_sam_name()) ) domain = my_sam_name(); /* we know that it is a trusted domain (and we are allowing them) or it is our domain */ result = make_user_info(user_info, smb_name, internal_username, client_domain, domain, wksta_name, lm_pwd, nt_pwd, lm_interactive_pwd, nt_interactive_pwd, plaintext, encrypted); if (NT_STATUS_IS_OK(result)) { (*user_info)->was_mapped = was_mapped; } return result; } /**************************************************************************** Create an auth_usersupplied_data, making the DATA_BLOBs here. Decrypt and encrypt the passwords. ****************************************************************************/ BOOL make_user_info_netlogon_network(auth_usersupplied_info **user_info, const char *smb_name, const char *client_domain, const char *wksta_name, uint32 logon_parameters, const uchar *lm_network_pwd, int lm_pwd_len, const uchar *nt_network_pwd, int nt_pwd_len) { BOOL ret; NTSTATUS status; DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len); DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len); status = make_user_info_map(user_info, smb_name, client_domain, wksta_name, lm_pwd_len ? &lm_blob : NULL, nt_pwd_len ? &nt_blob : NULL, NULL, NULL, NULL, True); if (NT_STATUS_IS_OK(status)) { (*user_info)->logon_parameters = logon_parameters; } ret = NT_STATUS_IS_OK(status) ? True : False; data_blob_free(&lm_blob); data_blob_free(&nt_blob); return ret; } /**************************************************************************** Create an auth_usersupplied_data, making the DATA_BLOBs here. Decrypt and encrypt the passwords. ****************************************************************************/ BOOL make_user_info_netlogon_interactive(auth_usersupplied_info **user_info, const char *smb_name, const char *client_domain, const char *wksta_name, uint32 logon_parameters, const uchar chal[8], const uchar lm_interactive_pwd[16], const uchar nt_interactive_pwd[16], const uchar *dc_sess_key) { unsigned char lm_pwd[16]; unsigned char nt_pwd[16]; unsigned char local_lm_response[24]; unsigned char local_nt_response[24]; unsigned char key[16]; ZERO_STRUCT(key); memcpy(key, dc_sess_key, 8); if (lm_interactive_pwd) memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd)); if (nt_interactive_pwd) memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd)); #ifdef DEBUG_PASSWORD DEBUG(100,("key:")); dump_data(100, key, sizeof(key)); DEBUG(100,("lm owf password:")); dump_data(100, lm_pwd, sizeof(lm_pwd)); DEBUG(100,("nt owf password:")); dump_data(100, nt_pwd, sizeof(nt_pwd)); #endif if (lm_interactive_pwd) SamOEMhash(lm_pwd, key, sizeof(lm_pwd)); if (nt_interactive_pwd) SamOEMhash(nt_pwd, key, sizeof(nt_pwd)); #ifdef DEBUG_PASSWORD DEBUG(100,("decrypt of lm owf password:")); dump_data(100, lm_pwd, sizeof(lm_pwd)); DEBUG(100,("decrypt of nt owf password:")); dump_data(100, nt_pwd, sizeof(nt_pwd)); #endif if (lm_interactive_pwd) SMBOWFencrypt(lm_pwd, chal, local_lm_response); if (nt_interactive_pwd) SMBOWFencrypt(nt_pwd, chal, local_nt_response); /* Password info paranoia */ ZERO_STRUCT(key); { BOOL ret; NTSTATUS nt_status; DATA_BLOB local_lm_blob; DATA_BLOB local_nt_blob; DATA_BLOB lm_interactive_blob; DATA_BLOB nt_interactive_blob; if (lm_interactive_pwd) { local_lm_blob = data_blob(local_lm_response, sizeof(local_lm_response)); lm_interactive_blob = data_blob(lm_pwd, sizeof(lm_pwd)); ZERO_STRUCT(lm_pwd); } if (nt_interactive_pwd) { local_nt_blob = data_blob(local_nt_response, sizeof(local_nt_response)); nt_interactive_blob = data_blob(nt_pwd, sizeof(nt_pwd)); ZERO_STRUCT(nt_pwd); } nt_status = make_user_info_map( user_info, smb_name, client_domain, wksta_name, lm_interactive_pwd ? &local_lm_blob : NULL, nt_interactive_pwd ? &local_nt_blob : NULL, lm_interactive_pwd ? &lm_interactive_blob : NULL, nt_interactive_pwd ? &nt_interactive_blob : NULL, NULL, True); if (NT_STATUS_IS_OK(nt_status)) { (*user_info)->logon_parameters = logon_parameters; } ret = NT_STATUS_IS_OK(nt_status) ? True : False; data_blob_free(&local_lm_blob); data_blob_free(&local_nt_blob); data_blob_free(&lm_interactive_blob); data_blob_free(&nt_interactive_blob); return ret; } } /**************************************************************************** Create an auth_usersupplied_data structure ****************************************************************************/ BOOL make_user_info_for_reply(auth_usersupplied_info **user_info, const char *smb_name, const char *client_domain, const uint8 chal[8], DATA_BLOB plaintext_password) { DATA_BLOB local_lm_blob; DATA_BLOB local_nt_blob; NTSTATUS ret = NT_STATUS_UNSUCCESSFUL; /* * Not encrypted - do so. */ DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted " "format.\n")); if (plaintext_password.data) { unsigned char local_lm_response[24]; #ifdef DEBUG_PASSWORD DEBUG(10,("Unencrypted password (len %d):\n", (int)plaintext_password.length)); dump_data(100, plaintext_password.data, plaintext_password.length); #endif SMBencrypt( (const char *)plaintext_password.data, (const uchar*)chal, local_lm_response); local_lm_blob = data_blob(local_lm_response, 24); /* We can't do an NT hash here, as the password needs to be case insensitive */ local_nt_blob = data_blob(NULL, 0); } else { local_lm_blob = data_blob(NULL, 0); local_nt_blob = data_blob(NULL, 0); } ret = make_user_info_map( user_info, smb_name, client_domain, get_remote_machine_name(), local_lm_blob.data ? &local_lm_blob : NULL, local_nt_blob.data ? &local_nt_blob : NULL, NULL, NULL, plaintext_password.data ? &plaintext_password : NULL, False); data_blob_free(&local_lm_blob); return NT_STATUS_IS_OK(ret) ? True : False; } /**************************************************************************** Create an auth_usersupplied_data structure ****************************************************************************/ NTSTATUS make_user_info_for_reply_enc(auth_usersupplied_info **user_info, const char *smb_name, const char *client_domain, DATA_BLOB lm_resp, DATA_BLOB nt_resp) { return make_user_info_map(user_info, smb_name, client_domain, get_remote_machine_name(), lm_resp.data ? &lm_resp : NULL, nt_resp.data ? &nt_resp : NULL, NULL, NULL, NULL, True); } /**************************************************************************** Create a guest user_info blob, for anonymous authenticaion. ****************************************************************************/ BOOL make_user_info_guest(auth_usersupplied_info **user_info) { NTSTATUS nt_status; nt_status = make_user_info(user_info, "","", "","", "", NULL, NULL, NULL, NULL, NULL, True); return NT_STATUS_IS_OK(nt_status) ? True : False; } /**************************************************************************** prints a NT_USER_TOKEN to debug output. ****************************************************************************/ void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token) { size_t i; if (!token) { DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n")); return; } DEBUGC(dbg_class, dbg_lev, ("NT user token of user %s\n", sid_string_static(&token->user_sids[0]) )); DEBUGADDC(dbg_class, dbg_lev, ("contains %lu SIDs\n", (unsigned long)token->num_sids)); for (i = 0; i < token->num_sids; i++) DEBUGADDC(dbg_class, dbg_lev, ("SID[%3lu]: %s\n", (unsigned long)i, sid_string_static(&token->user_sids[i]))); dump_se_priv( dbg_class, dbg_lev, &token->privileges ); } /**************************************************************************** prints a UNIX 'token' to debug output. ****************************************************************************/ void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid, int n_groups, gid_t *groups) { int i; DEBUGC(dbg_class, dbg_lev, ("UNIX token of user %ld\n", (long int)uid)); DEBUGADDC(dbg_class, dbg_lev, ("Primary group is %ld and contains %i supplementary " "groups\n", (long int)gid, n_groups)); for (i = 0; i < n_groups; i++) DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i, (long int)groups[i])); } static int server_info_dtor(auth_serversupplied_info *server_info) { TALLOC_FREE(server_info->sam_account); ZERO_STRUCTP(server_info); return 0; } /*************************************************************************** Make a server_info struct. Free with TALLOC_FREE(). ***************************************************************************/ static auth_serversupplied_info *make_server_info(TALLOC_CTX *mem_ctx) { struct auth_serversupplied_info *result; result = TALLOC_ZERO_P(mem_ctx, auth_serversupplied_info); if (result == NULL) { DEBUG(0, ("talloc failed\n")); return NULL; } talloc_set_destructor(result, server_info_dtor); /* Initialise the uid and gid values to something non-zero which may save us from giving away root access if there is a bug in allocating these fields. */ result->uid = -1; result->gid = -1; return result; } /*************************************************************************** Make (and fill) a user_info struct from a struct samu ***************************************************************************/ NTSTATUS make_server_info_sam(auth_serversupplied_info **server_info, struct samu *sampass) { NTSTATUS status; struct passwd *pwd; gid_t *gids; auth_serversupplied_info *result; int i; size_t num_gids; DOM_SID unix_group_sid; if ( !(result = make_server_info(NULL)) ) { return NT_STATUS_NO_MEMORY; } if ( !(pwd = getpwnam_alloc(result, pdb_get_username(sampass))) ) { DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n", pdb_get_username(sampass))); TALLOC_FREE(result); return NT_STATUS_NO_SUCH_USER; } result->sam_account = sampass; /* Ensure thaat the sampass will be freed with the result */ talloc_steal(result, sampass); result->unix_name = pwd->pw_name; /* Ensure that we keep pwd->pw_name, because we will free pwd below */ talloc_steal(result, pwd->pw_name); result->gid = pwd->pw_gid; result->uid = pwd->pw_uid; TALLOC_FREE(pwd); status = pdb_enum_group_memberships(result, sampass, &result->sids, &gids, &result->num_sids); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("pdb_enum_group_memberships failed: %s\n", nt_errstr(status))); result->sam_account = NULL; /* Don't free on error exit. */ TALLOC_FREE(result); return status; } /* Add the "Unix Group" SID for each gid to catch mapped groups and their Unix equivalent. This is to solve the backwards compatibility problem of 'valid users = +ntadmin' where ntadmin has been paired with "Domain Admins" in the group mapping table. Otherwise smb.conf would need to be changed to 'valid user = "Domain Admins"'. --jerry */ num_gids = result->num_sids; for ( i=0; i<num_gids; i++ ) { if ( !gid_to_unix_groups_sid( gids[i], &unix_group_sid ) ) { DEBUG(1,("make_server_info_sam: Failed to create SID " "for gid %d!\n", gids[i])); continue; } if (!add_sid_to_array_unique( result, &unix_group_sid, &result->sids, &result->num_sids )) { result->sam_account = NULL; /* Don't free on error exit. */ TALLOC_FREE(result); return NT_STATUS_NO_MEMORY; } } /* For now we throw away the gids and convert via sid_to_gid * later. This needs fixing, but I'd like to get the code straight and * simple first. */ TALLOC_FREE(gids); DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n", pdb_get_username(sampass), result->unix_name)); *server_info = result; return NT_STATUS_OK; } static NTSTATUS log_nt_token(TALLOC_CTX *tmp_ctx, NT_USER_TOKEN *token) { char *command; char *group_sidstr; size_t i; if ((lp_log_nt_token_command() == NULL) || (strlen(lp_log_nt_token_command()) == 0)) { return NT_STATUS_OK; } group_sidstr = talloc_strdup(tmp_ctx, ""); for (i=1; i<token->num_sids; i++) { group_sidstr = talloc_asprintf( tmp_ctx, "%s %s", group_sidstr, sid_string_static(&token->user_sids[i])); } command = talloc_string_sub( tmp_ctx, lp_log_nt_token_command(), "%s", sid_string_static(&token->user_sids[0])); command = talloc_string_sub(tmp_ctx, command, "%t", group_sidstr); if (command == NULL) { return NT_STATUS_NO_MEMORY; } DEBUG(8, ("running command: [%s]\n", command)); if (smbrun(command, NULL) != 0) { DEBUG(0, ("Could not log NT token\n")); return NT_STATUS_ACCESS_DENIED; } return NT_STATUS_OK; } /* * Create the token to use from server_info->sam_account and * server_info->sids (the info3/sam groups). Find the unix gids. */ NTSTATUS create_local_token(auth_serversupplied_info *server_info) { TALLOC_CTX *mem_ctx; NTSTATUS status; size_t i; mem_ctx = talloc_new(NULL); if (mem_ctx == NULL) { DEBUG(0, ("talloc_new failed\n")); return NT_STATUS_NO_MEMORY; } /* * If winbind is not around, we can not make much use of the SIDs the * domain controller provided us with. Likewise if the user name was * mapped to some local unix user. */ if (((lp_server_role() == ROLE_DOMAIN_MEMBER) && !winbind_ping()) || (server_info->was_mapped)) { status = create_token_from_username(server_info, server_info->unix_name, server_info->guest, &server_info->uid, &server_info->gid, &server_info->unix_name, &server_info->ptok); } else { server_info->ptok = create_local_nt_token( server_info, pdb_get_user_sid(server_info->sam_account), server_info->guest, server_info->num_sids, server_info->sids); status = server_info->ptok ? NT_STATUS_OK : NT_STATUS_NO_SUCH_USER; } if (!NT_STATUS_IS_OK(status)) { TALLOC_FREE(mem_ctx); return status; } /* Convert the SIDs to gids. */ server_info->n_groups = 0; server_info->groups = NULL; /* Start at index 1, where the groups start. */ for (i=1; i<server_info->ptok->num_sids; i++) { gid_t gid; DOM_SID *sid = &server_info->ptok->user_sids[i]; if (!sid_to_gid(sid, &gid)) { DEBUG(10, ("Could not convert SID %s to gid, " "ignoring it\n", sid_string_static(sid))); continue; } add_gid_to_array_unique(server_info, gid, &server_info->groups, &server_info->n_groups); } debug_nt_user_token(DBGC_AUTH, 10, server_info->ptok); status = log_nt_token(mem_ctx, server_info->ptok); TALLOC_FREE(mem_ctx); return status; } /* * Create an artificial NT token given just a username. (Initially indended * for force user) * * We go through lookup_name() to avoid problems we had with 'winbind use * default domain'. * * We have 3 cases: * * unmapped unix users: Go directly to nss to find the user's group. * * A passdb user: The list of groups is provided by pdb_enum_group_memberships. * * If the user is provided by winbind, the primary gid is set to "domain * users" of the user's domain. For an explanation why this is necessary, see * the thread starting at * http://lists.samba.org/archive/samba-technical/2006-January/044803.html. */ NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username, BOOL is_guest, uid_t *uid, gid_t *gid, char **found_username, struct nt_user_token **token) { NTSTATUS result = NT_STATUS_NO_SUCH_USER; TALLOC_CTX *tmp_ctx; DOM_SID user_sid; enum lsa_SidType type; gid_t *gids; DOM_SID *group_sids; DOM_SID unix_group_sid; size_t num_group_sids; size_t num_gids; size_t i; tmp_ctx = talloc_new(NULL); if (tmp_ctx == NULL) { DEBUG(0, ("talloc_new failed\n")); return NT_STATUS_NO_MEMORY; } if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL, NULL, NULL, &user_sid, &type)) { DEBUG(1, ("lookup_name_smbconf for %s failed\n", username)); goto done; } if (type != SID_NAME_USER) { DEBUG(1, ("%s is a %s, not a user\n", username, sid_type_lookup(type))); goto done; } if (!sid_to_uid(&user_sid, uid)) { DEBUG(1, ("sid_to_uid for %s (%s) failed\n", username, sid_string_static(&user_sid))); goto done; } if (sid_check_is_in_our_domain(&user_sid)) { /* This is a passdb user, so ask passdb */ struct samu *sam_acct = NULL; if ( !(sam_acct = samu_new( tmp_ctx )) ) { result = NT_STATUS_NO_MEMORY; goto done; } if (!pdb_getsampwsid(sam_acct, &user_sid)) { DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n", sid_string_static(&user_sid), username)); DEBUGADD(1, ("Fall back to unix user %s\n", username)); goto unix_user; } result = pdb_enum_group_memberships(tmp_ctx, sam_acct, &group_sids, &gids, &num_group_sids); if (!NT_STATUS_IS_OK(result)) { DEBUG(10, ("enum_group_memberships failed for %s\n", username)); DEBUGADD(1, ("Fall back to unix user %s\n", username)); goto unix_user; } /* see the smb_panic() in pdb_default_enum_group_memberships */ SMB_ASSERT(num_group_sids > 0); *gid = gids[0]; /* Ensure we're returning the found_username on the right context. */ *found_username = talloc_strdup(mem_ctx, pdb_get_username(sam_acct)); } else if (sid_check_is_in_unix_users(&user_sid)) { /* This is a unix user not in passdb. We need to ask nss * directly, without consulting passdb */ struct passwd *pass; /* * This goto target is used as a fallback for the passdb * case. The concrete bug report is when passdb gave us an * unmapped gid. */ unix_user: uid_to_unix_users_sid(*uid, &user_sid); pass = getpwuid_alloc(tmp_ctx, *uid); if (pass == NULL) { DEBUG(1, ("getpwuid(%d) for user %s failed\n", *uid, username)); goto done; } if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid, &gids, &num_group_sids)) { DEBUG(1, ("getgroups_unix_user for user %s failed\n", username)); goto done; } group_sids = talloc_array(tmp_ctx, DOM_SID, num_group_sids); if (group_sids == NULL) { DEBUG(1, ("talloc_array failed\n")); result = NT_STATUS_NO_MEMORY; goto done; } for (i=0; i<num_group_sids; i++) { gid_to_sid(&group_sids[i], gids[i]); } /* In getgroups_unix_user we always set the primary gid */ SMB_ASSERT(num_group_sids > 0); *gid = gids[0]; /* Ensure we're returning the found_username on the right context. */ *found_username = talloc_strdup(mem_ctx, pass->pw_name); } else { /* This user is from winbind, force the primary gid to the * user's "domain users" group. Under certain circumstances * (user comes from NT4), this might be a loss of * information. But we can not rely on winbind getting the * correct info. AD might prohibit winbind looking up that * information. */ uint32 dummy; num_group_sids = 1; group_sids = talloc_array(tmp_ctx, DOM_SID, num_group_sids); if (group_sids == NULL) { DEBUG(1, ("talloc_array failed\n")); result = NT_STATUS_NO_MEMORY; goto done; } sid_copy(&group_sids[0], &user_sid); sid_split_rid(&group_sids[0], &dummy); sid_append_rid(&group_sids[0], DOMAIN_GROUP_RID_USERS); if (!sid_to_gid(&group_sids[0], gid)) { DEBUG(1, ("sid_to_gid(%s) failed\n", sid_string_static(&group_sids[0]))); goto done; } gids = gid; /* Ensure we're returning the found_username on the right context. */ *found_username = talloc_strdup(mem_ctx, username); } /* Add the "Unix Group" SID for each gid to catch mapped groups and their Unix equivalent. This is to solve the backwards compatibility problem of 'valid users = +ntadmin' where ntadmin has been paired with "Domain Admins" in the group mapping table. Otherwise smb.conf would need to be changed to 'valid user = "Domain Admins"'. --jerry */ num_gids = num_group_sids; for ( i=0; i<num_gids; i++ ) { gid_t high, low; /* don't pickup anything managed by Winbind */ if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) ) continue; if ( !gid_to_unix_groups_sid( gids[i], &unix_group_sid ) ) { DEBUG(1,("create_token_from_username: Failed to create SID " "for gid %d!\n", gids[i])); continue; } if (!add_sid_to_array_unique(tmp_ctx, &unix_group_sid, &group_sids, &num_group_sids )) { result = NT_STATUS_NO_MEMORY; goto done; } } /* Ensure we're creating the nt_token on the right context. */ *token = create_local_nt_token(mem_ctx, &user_sid, is_guest, num_group_sids, group_sids); if ((*token == NULL) || (*found_username == NULL)) { result = NT_STATUS_NO_MEMORY; goto done; } result = NT_STATUS_OK; done: TALLOC_FREE(tmp_ctx); return result; } /*************************************************************************** Build upon create_token_from_username: Expensive helper function to figure out whether a user given its name is member of a particular group. ***************************************************************************/ BOOL user_in_group_sid(const char *username, const DOM_SID *group_sid) { NTSTATUS status; uid_t uid; gid_t gid; char *found_username; struct nt_user_token *token; BOOL result; TALLOC_CTX *mem_ctx; mem_ctx = talloc_new(NULL); if (mem_ctx == NULL) { DEBUG(0, ("talloc_new failed\n")); return False; } status = create_token_from_username(mem_ctx, username, False, &uid, &gid, &found_username, &token); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("could not create token for %s\n", username)); return False; } result = nt_token_check_sid(group_sid, token); TALLOC_FREE(mem_ctx); return result; } BOOL user_in_group(const char *username, const char *groupname) { TALLOC_CTX *mem_ctx; DOM_SID group_sid; BOOL ret; mem_ctx = talloc_new(NULL); if (mem_ctx == NULL) { DEBUG(0, ("talloc_new failed\n")); return False; } ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL, NULL, NULL, &group_sid, NULL); TALLOC_FREE(mem_ctx); if (!ret) { DEBUG(10, ("lookup_name for (%s) failed.\n", groupname)); return False; } return user_in_group_sid(username, &group_sid); } /*************************************************************************** Make (and fill) a user_info struct from a 'struct passwd' by conversion to a struct samu ***************************************************************************/ NTSTATUS make_server_info_pw(auth_serversupplied_info **server_info, char *unix_username, struct passwd *pwd) { NTSTATUS status; struct samu *sampass = NULL; gid_t *gids; auth_serversupplied_info *result; if ( !(sampass = samu_new( NULL )) ) { return NT_STATUS_NO_MEMORY; } status = samu_set_unix( sampass, pwd ); if (!NT_STATUS_IS_OK(status)) { return status; } result = make_server_info(NULL); if (result == NULL) { TALLOC_FREE(sampass); return NT_STATUS_NO_MEMORY; } result->sam_account = sampass; result->unix_name = talloc_strdup(result, unix_username); result->uid = pwd->pw_uid; result->gid = pwd->pw_gid; status = pdb_enum_group_memberships(result, sampass, &result->sids, &gids, &result->num_sids); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("pdb_enum_group_memberships failed: %s\n", nt_errstr(status))); TALLOC_FREE(result); return status; } /* For now we throw away the gids and convert via sid_to_gid * later. This needs fixing, but I'd like to get the code straight and * simple first. */ TALLOC_FREE(gids); *server_info = result; return NT_STATUS_OK; } /*************************************************************************** Make (and fill) a user_info struct for a guest login. This *must* succeed for smbd to start. If there is no mapping entry for the guest gid, then create one. ***************************************************************************/ static NTSTATUS make_new_server_info_guest(auth_serversupplied_info **server_info) { NTSTATUS status; struct samu *sampass = NULL; DOM_SID guest_sid; BOOL ret; static const char zeros[16] = { 0, }; if ( !(sampass = samu_new( NULL )) ) { return NT_STATUS_NO_MEMORY; } sid_copy(&guest_sid, get_global_sam_sid()); sid_append_rid(&guest_sid, DOMAIN_USER_RID_GUEST); become_root(); ret = pdb_getsampwsid(sampass, &guest_sid); unbecome_root(); if (!ret) { TALLOC_FREE(sampass); return NT_STATUS_NO_SUCH_USER; } status = make_server_info_sam(server_info, sampass); if (!NT_STATUS_IS_OK(status)) { TALLOC_FREE(sampass); return status; } (*server_info)->guest = True; status = create_local_token(*server_info); if (!NT_STATUS_IS_OK(status)) { DEBUG(10, ("create_local_token failed: %s\n", nt_errstr(status))); return status; } /* annoying, but the Guest really does have a session key, and it is all zeros! */ (*server_info)->user_session_key = data_blob(zeros, sizeof(zeros)); (*server_info)->lm_session_key = data_blob(zeros, sizeof(zeros)); return NT_STATUS_OK; } static auth_serversupplied_info *copy_serverinfo(auth_serversupplied_info *src) { auth_serversupplied_info *dst; dst = make_server_info(NULL); if (dst == NULL) { return NULL; } dst->guest = src->guest; dst->uid = src->uid; dst->gid = src->gid; dst->n_groups = src->n_groups; if (src->n_groups != 0) { dst->groups = (gid_t *)talloc_memdup( dst, src->groups, sizeof(gid_t)*dst->n_groups); } else { dst->groups = NULL; } if (src->ptok) { dst->ptok = dup_nt_token(dst, src->ptok); if (!dst->ptok) { TALLOC_FREE(dst); return NULL; } } dst->user_session_key = data_blob_talloc( dst, src->user_session_key.data, src->user_session_key.length); dst->lm_session_key = data_blob_talloc(dst, src->lm_session_key.data, src->lm_session_key.length); dst->sam_account = samu_new(NULL); if (!dst->sam_account) { TALLOC_FREE(dst); return NULL; } if (!pdb_copy_sam_account(dst->sam_account, src->sam_account)) { TALLOC_FREE(dst); return NULL; } dst->pam_handle = NULL; dst->unix_name = talloc_strdup(dst, src->unix_name); if (!dst->unix_name) { TALLOC_FREE(dst); return NULL; } return dst; } static auth_serversupplied_info *guest_info = NULL; BOOL init_guest_info(void) { if (guest_info != NULL) return True; return NT_STATUS_IS_OK(make_new_server_info_guest(&guest_info)); } NTSTATUS make_server_info_guest(auth_serversupplied_info **server_info) { *server_info = copy_serverinfo(guest_info); return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY; } BOOL copy_current_user(struct current_user *dst, struct current_user *src) { gid_t *groups; NT_USER_TOKEN *nt_token; groups = (gid_t *)memdup(src->ut.groups, sizeof(gid_t) * src->ut.ngroups); if ((src->ut.ngroups != 0) && (groups == NULL)) { return False; } nt_token = dup_nt_token(NULL, src->nt_user_token); if (nt_token == NULL) { SAFE_FREE(groups); return False; } dst->conn = src->conn; dst->vuid = src->vuid; dst->ut.uid = src->ut.uid; dst->ut.gid = src->ut.gid; dst->ut.ngroups = src->ut.ngroups; dst->ut.groups = groups; dst->nt_user_token = nt_token; return True; } BOOL set_current_user_guest(struct current_user *dst) { gid_t *groups; NT_USER_TOKEN *nt_token; groups = (gid_t *)memdup(guest_info->groups, sizeof(gid_t) * guest_info->n_groups); if (groups == NULL) { return False; } nt_token = dup_nt_token(NULL, guest_info->ptok); if (nt_token == NULL) { SAFE_FREE(groups); return False; } TALLOC_FREE(dst->nt_user_token); SAFE_FREE(dst->ut.groups); /* dst->conn is never really dereferenced, it's only tested for * equality in uid.c */ dst->conn = NULL; dst->vuid = UID_FIELD_INVALID; dst->ut.uid = guest_info->uid; dst->ut.gid = guest_info->gid; dst->ut.ngroups = guest_info->n_groups; dst->ut.groups = groups; dst->nt_user_token = nt_token; return True; } /*************************************************************************** Purely internal function for make_server_info_info3 Fill the sam account from getpwnam ***************************************************************************/ static NTSTATUS fill_sam_account(TALLOC_CTX *mem_ctx, const char *domain, const char *username, char **found_username, uid_t *uid, gid_t *gid, struct samu *account, BOOL *username_was_mapped) { NTSTATUS nt_status; fstring dom_user, lower_username; fstring real_username; struct passwd *passwd; fstrcpy( lower_username, username ); strlower_m( lower_username ); fstr_sprintf(dom_user, "%s%c%s", domain, *lp_winbind_separator(), lower_username); /* Get the passwd struct. Try to create the account is necessary. */ *username_was_mapped = map_username( dom_user ); if ( !(passwd = smb_getpwnam( NULL, dom_user, real_username, True )) ) return NT_STATUS_NO_SUCH_USER; *uid = passwd->pw_uid; *gid = passwd->pw_gid; /* This is pointless -- there is no suport for differing unix and windows names. Make sure to always store the one we actually looked up and succeeded. Have I mentioned why I hate the 'winbind use default domain' parameter? --jerry */ *found_username = talloc_strdup( mem_ctx, real_username ); DEBUG(5,("fill_sam_account: located username was [%s]\n", *found_username)); nt_status = samu_set_unix( account, passwd ); TALLOC_FREE(passwd); return nt_status; } /**************************************************************************** Wrapper to allow the getpwnam() call to strip the domain name and try again in case a local UNIX user is already there. Also run through the username if we fallback to the username only. ****************************************************************************/ struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, char *domuser, fstring save_username, BOOL create ) { struct passwd *pw = NULL; char *p; fstring username; /* we only save a copy of the username it has been mangled by winbindd use default domain */ save_username[0] = '\0'; /* don't call map_username() here since it has to be done higher up the stack so we don't call it mutliple times */ fstrcpy( username, domuser ); p = strchr_m( username, *lp_winbind_separator() ); /* code for a DOMAIN\user string */ if ( p ) { fstring strip_username; pw = Get_Pwnam_alloc( mem_ctx, domuser ); if ( pw ) { /* make sure we get the case of the username correct */ /* work around 'winbind use default domain = yes' */ if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) { char *domain; /* split the domain and username into 2 strings */ *p = '\0'; domain = username; fstr_sprintf(save_username, "%s%c%s", domain, *lp_winbind_separator(), pw->pw_name); } else fstrcpy( save_username, pw->pw_name ); /* whew -- done! */ return pw; } /* setup for lookup of just the username */ /* remember that p and username are overlapping memory */ p++; fstrcpy( strip_username, p ); fstrcpy( username, strip_username ); } /* just lookup a plain username */ pw = Get_Pwnam_alloc(mem_ctx, username); /* Create local user if requested but only if winbindd is not running. We need to protect against cases where winbindd is failing and then prematurely creating users in /etc/passwd */ if ( !pw && create && !winbind_ping() ) { /* Don't add a machine account. */ if (username[strlen(username)-1] == '$') return NULL; smb_create_user(NULL, username, NULL); pw = Get_Pwnam_alloc(mem_ctx, username); } /* one last check for a valid passwd struct */ if ( pw ) fstrcpy( save_username, pw->pw_name ); return pw; } /*************************************************************************** Make a server_info struct from the info3 returned by a domain logon ***************************************************************************/ NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx, const char *sent_nt_username, const char *domain, auth_serversupplied_info **server_info, NET_USER_INFO_3 *info3) { static const char zeros[16] = { 0, }; NTSTATUS nt_status = NT_STATUS_OK; char *found_username; const char *nt_domain; const char *nt_username; struct samu *sam_account = NULL; DOM_SID user_sid; DOM_SID group_sid; BOOL username_was_mapped; uid_t uid; gid_t gid; size_t i; auth_serversupplied_info *result; /* Here is where we should check the list of trusted domains, and verify that the SID matches. */ sid_copy(&user_sid, &info3->dom_sid.sid); if (!sid_append_rid(&user_sid, info3->user_rid)) { return NT_STATUS_INVALID_PARAMETER; } sid_copy(&group_sid, &info3->dom_sid.sid); if (!sid_append_rid(&group_sid, info3->group_rid)) { return NT_STATUS_INVALID_PARAMETER; } if (!(nt_username = unistr2_tdup(mem_ctx, &(info3->uni_user_name)))) { /* If the server didn't give us one, just use the one we sent * them */ nt_username = sent_nt_username; } if (!(nt_domain = unistr2_tdup(mem_ctx, &(info3->uni_logon_dom)))) { /* If the server didn't give us one, just use the one we sent * them */ nt_domain = domain; } /* try to fill the SAM account.. If getpwnam() fails, then try the add user script (2.2.x behavior). We use the _unmapped_ username here in an attempt to provide consistent username mapping behavior between kerberos and NTLM[SSP] authentication in domain mode security. I.E. Username mapping should be applied to the fully qualified username (e.g. DOMAIN\user) and not just the login name. Yes this means we called map_username() unnecessarily in make_user_info_map() but that is how the current code is designed. Making the change here is the least disruptive place. -- jerry */ if ( !(sam_account = samu_new( NULL )) ) { return NT_STATUS_NO_MEMORY; } /* this call will try to create the user if necessary */ nt_status = fill_sam_account(mem_ctx, nt_domain, sent_nt_username, &found_username, &uid, &gid, sam_account, &username_was_mapped); /* if we still don't have a valid unix account check for 'map to guest = bad uid' */ if (!NT_STATUS_IS_OK(nt_status)) { TALLOC_FREE( sam_account ); if ( lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID ) { make_server_info_guest(server_info); return NT_STATUS_OK; } return nt_status; } if (!pdb_set_nt_username(sam_account, nt_username, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_username(sam_account, nt_username, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_domain(sam_account, nt_domain, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_user_sid(sam_account, &user_sid, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_UNSUCCESSFUL; } if (!pdb_set_group_sid(sam_account, &group_sid, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_UNSUCCESSFUL; } if (!pdb_set_fullname(sam_account, unistr2_static(&(info3->uni_full_name)), PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_logon_script(sam_account, unistr2_static(&(info3->uni_logon_script)), PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_profile_path(sam_account, unistr2_static(&(info3->uni_profile_path)), PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_homedir(sam_account, unistr2_static(&(info3->uni_home_dir)), PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_dir_drive(sam_account, unistr2_static(&(info3->uni_dir_drive)), PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } if (!pdb_set_acct_ctrl(sam_account, info3->acct_flags, PDB_CHANGED)) { TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } result = make_server_info(NULL); if (result == NULL) { DEBUG(4, ("make_server_info failed!\n")); TALLOC_FREE(sam_account); return NT_STATUS_NO_MEMORY; } /* save this here to _net_sam_logon() doesn't fail (it assumes a valid struct samu) */ result->sam_account = sam_account; result->unix_name = talloc_strdup(result, found_username); /* Fill in the unix info we found on the way */ result->uid = uid; result->gid = gid; /* Create a 'combined' list of all SIDs we might want in the SD */ result->num_sids = 0; result->sids = NULL; /* and create (by appending rids) the 'domain' sids */ for (i = 0; i < info3->num_groups2; i++) { DOM_SID sid; if (!sid_compose(&sid, &info3->dom_sid.sid, info3->gids[i].g_rid)) { DEBUG(3,("could not append additional group rid " "0x%x\n", info3->gids[i].g_rid)); TALLOC_FREE(result); return NT_STATUS_INVALID_PARAMETER; } if (!add_sid_to_array(result, &sid, &result->sids, &result->num_sids)) { TALLOC_FREE(result); return NT_STATUS_NO_MEMORY; } } /* Copy 'other' sids. We need to do sid filtering here to prevent possible elevation of privileges. See: http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp */ for (i = 0; i < info3->num_other_sids; i++) { if (!add_sid_to_array(result, &info3->other_sids[i].sid, &result->sids, &result->num_sids)) { TALLOC_FREE(result); return NT_STATUS_NO_MEMORY; } } result->login_server = unistr2_tdup(result, &(info3->uni_logon_srv)); /* ensure we are never given NULL session keys */ if (memcmp(info3->user_sess_key, zeros, sizeof(zeros)) == 0) { result->user_session_key = data_blob(NULL, 0); } else { result->user_session_key = data_blob_talloc( result, info3->user_sess_key, sizeof(info3->user_sess_key)); } if (memcmp(info3->lm_sess_key, zeros, 8) == 0) { result->lm_session_key = data_blob(NULL, 0); } else { result->lm_session_key = data_blob_talloc( result, info3->lm_sess_key, sizeof(info3->lm_sess_key)); } result->was_mapped = username_was_mapped; *server_info = result; return NT_STATUS_OK; } /*************************************************************************** Free a user_info struct ***************************************************************************/ void free_user_info(auth_usersupplied_info **user_info) { DEBUG(5,("attempting to free (and zero) a user_info structure\n")); if (*user_info != NULL) { if ((*user_info)->smb_name) { DEBUG(10,("structure was created for %s\n", (*user_info)->smb_name)); } SAFE_FREE((*user_info)->smb_name); SAFE_FREE((*user_info)->internal_username); SAFE_FREE((*user_info)->client_domain); SAFE_FREE((*user_info)->domain); SAFE_FREE((*user_info)->wksta_name); data_blob_free(&(*user_info)->lm_resp); data_blob_free(&(*user_info)->nt_resp); data_blob_clear_free(&(*user_info)->lm_interactive_pwd); data_blob_clear_free(&(*user_info)->nt_interactive_pwd); data_blob_clear_free(&(*user_info)->plaintext_password); ZERO_STRUCT(**user_info); } SAFE_FREE(*user_info); } /*************************************************************************** Make an auth_methods struct ***************************************************************************/ BOOL make_auth_methods(struct auth_context *auth_context, auth_methods **auth_method) { if (!auth_context) { smb_panic("no auth_context supplied to " "make_auth_methods()!\n"); } if (!auth_method) { smb_panic("make_auth_methods: pointer to auth_method pointer " "is NULL!\n"); } *auth_method = TALLOC_P(auth_context->mem_ctx, auth_methods); if (!*auth_method) { DEBUG(0,("make_auth_method: malloc failed!\n")); return False; } ZERO_STRUCTP(*auth_method); return True; } /** * Verify whether or not given domain is trusted. * * @param domain_name name of the domain to be verified * @return true if domain is one of the trusted once or * false if otherwise **/ BOOL is_trusted_domain(const char* dom_name) { DOM_SID trustdom_sid; BOOL ret; /* no trusted domains for a standalone server */ if ( lp_server_role() == ROLE_STANDALONE ) return False; /* if we are a DC, then check for a direct trust relationships */ if ( IS_DC ) { become_root(); DEBUG (5,("is_trusted_domain: Checking for domain trust with " "[%s]\n", dom_name )); ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL); unbecome_root(); if (ret) return True; } else { NSS_STATUS result; /* If winbind is around, ask it */ result = wb_is_trusted_domain(dom_name); if (result == NSS_STATUS_SUCCESS) { return True; } if (result == NSS_STATUS_NOTFOUND) { /* winbind could not find the domain */ return False; } /* The only other possible result is that winbind is not up and running. We need to update the trustdom_cache ourselves */ update_trustdom_cache(); } /* now the trustdom cache should be available a DC could still * have a transitive trust so fall back to the cache of trusted * domains (like a domain member would use */ if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) { return True; } return False; }