diff options
Diffstat (limited to 'source4/auth/system_session.c')
| -rw-r--r-- | source4/auth/system_session.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/source4/auth/system_session.c b/source4/auth/system_session.c new file mode 100644 index 0000000000..1d227fe468 --- /dev/null +++ b/source4/auth/system_session.c @@ -0,0 +1,304 @@ +/* + 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) Stefan Metzmacher 2005 + + 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 "libcli/security/security.h" +#include "libcli/auth/libcli_auth.h" +#include "auth/credentials/credentials.h" +#include "param/param.h" +#include "auth/auth.h" /* for auth_serversupplied_info */ +#include "auth/session.h" +#include "auth/system_session_proto.h" + +/** + * Create the SID list for this user. + * + * @note Specialised version for system sessions that doesn't use the SAM. + */ +static NTSTATUS create_token(TALLOC_CTX *mem_ctx, + struct dom_sid *user_sid, + struct dom_sid *group_sid, + int n_groupSIDs, + struct dom_sid **groupSIDs, + bool is_authenticated, + struct security_token **token) +{ + struct security_token *ptoken; + int i; + + ptoken = security_token_initialise(mem_ctx); + NT_STATUS_HAVE_NO_MEMORY(ptoken); + + ptoken->sids = talloc_array(ptoken, struct dom_sid *, n_groupSIDs + 5); + NT_STATUS_HAVE_NO_MEMORY(ptoken->sids); + + ptoken->user_sid = talloc_reference(ptoken, user_sid); + ptoken->group_sid = talloc_reference(ptoken, group_sid); + ptoken->privilege_mask = 0; + + ptoken->sids[0] = ptoken->user_sid; + ptoken->sids[1] = ptoken->group_sid; + + /* + * Finally add the "standard" SIDs. + * The only difference between guest and "anonymous" + * is the addition of Authenticated_Users. + */ + ptoken->sids[2] = dom_sid_parse_talloc(ptoken->sids, SID_WORLD); + NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[2]); + ptoken->sids[3] = dom_sid_parse_talloc(ptoken->sids, SID_NT_NETWORK); + NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[3]); + ptoken->num_sids = 4; + + if (is_authenticated) { + ptoken->sids[4] = dom_sid_parse_talloc(ptoken->sids, SID_NT_AUTHENTICATED_USERS); + NT_STATUS_HAVE_NO_MEMORY(ptoken->sids[4]); + ptoken->num_sids++; + } + + for (i = 0; i < n_groupSIDs; i++) { + size_t check_sid_idx; + for (check_sid_idx = 1; + check_sid_idx < ptoken->num_sids; + check_sid_idx++) { + if (dom_sid_equal(ptoken->sids[check_sid_idx], groupSIDs[i])) { + break; + } + } + + if (check_sid_idx == ptoken->num_sids) { + ptoken->sids[ptoken->num_sids++] = talloc_reference(ptoken->sids, groupSIDs[i]); + } + } + + *token = ptoken; + + /* Shortcuts to prevent recursion and avoid lookups */ + if (ptoken->user_sid == NULL) { + ptoken->privilege_mask = 0; + return NT_STATUS_OK; + } + + if (security_token_is_system(ptoken)) { + ptoken->privilege_mask = ~0; + return NT_STATUS_OK; + } + + if (security_token_is_anonymous(ptoken)) { + ptoken->privilege_mask = 0; + return NT_STATUS_OK; + } + + DEBUG(0, ("Created token was not system or anonymous token!")); + *token = NULL; + return NT_STATUS_INTERNAL_ERROR; +} + +static NTSTATUS generate_session_info(TALLOC_CTX *mem_ctx, + struct auth_serversupplied_info *server_info, + struct auth_session_info **_session_info) +{ + struct auth_session_info *session_info; + NTSTATUS nt_status; + + session_info = talloc(mem_ctx, struct auth_session_info); + NT_STATUS_HAVE_NO_MEMORY(session_info); + + session_info->server_info = talloc_reference(session_info, server_info); + + /* unless set otherwise, the session key is the user session + * key from the auth subsystem */ + session_info->session_key = server_info->user_session_key; + + nt_status = create_token(session_info, + server_info->account_sid, + server_info->primary_group_sid, + server_info->n_domain_groups, + server_info->domain_groups, + server_info->authenticated, + &session_info->security_token); + NT_STATUS_NOT_OK_RETURN(nt_status); + + session_info->credentials = NULL; + + *_session_info = session_info; + return NT_STATUS_OK; +} + + + +/* Create a security token for a session SYSTEM (the most + * trusted/prvilaged account), including the local machine account as + * the off-host credentials + */ +_PUBLIC_ struct auth_session_info *system_session(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx) +{ + NTSTATUS nt_status; + struct auth_session_info *session_info = NULL; + nt_status = auth_system_session_info(mem_ctx, + lp_ctx, + &session_info); + if (!NT_STATUS_IS_OK(nt_status)) { + return NULL; + } + return session_info; +} + +static NTSTATUS _auth_system_session_info(TALLOC_CTX *parent_ctx, + struct loadparm_context *lp_ctx, + bool anonymous_credentials, + struct auth_session_info **_session_info) +{ + NTSTATUS nt_status; + struct auth_serversupplied_info *server_info = NULL; + struct auth_session_info *session_info = NULL; + TALLOC_CTX *mem_ctx = talloc_new(parent_ctx); + + nt_status = auth_system_server_info(mem_ctx, lp_netbios_name(lp_ctx), + &server_info); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(mem_ctx); + return nt_status; + } + + /* references the server_info into the session_info */ + nt_status = generate_session_info(parent_ctx, server_info, &session_info); + talloc_free(mem_ctx); + + NT_STATUS_NOT_OK_RETURN(nt_status); + + session_info->credentials = cli_credentials_init(session_info); + if (!session_info->credentials) { + return NT_STATUS_NO_MEMORY; + } + + cli_credentials_set_conf(session_info->credentials, lp_ctx); + + if (anonymous_credentials) { + cli_credentials_set_anonymous(session_info->credentials); + } else { + cli_credentials_set_machine_account_pending(session_info->credentials, lp_ctx); + } + *_session_info = session_info; + + return NT_STATUS_OK; +} + +/* + Create a system session, but with anonymous credentials (so we do not need to open secrets.ldb) +*/ +_PUBLIC_ struct auth_session_info *system_session_anon(TALLOC_CTX *mem_ctx, struct loadparm_context *lp_ctx) +{ + NTSTATUS nt_status; + struct auth_session_info *session_info = NULL; + nt_status = _auth_system_session_info(mem_ctx, lp_ctx, false, &session_info); + if (!NT_STATUS_IS_OK(nt_status)) { + return NULL; + } + return session_info; +} + + + +_PUBLIC_ NTSTATUS auth_system_session_info(TALLOC_CTX *parent_ctx, + struct loadparm_context *lp_ctx, + struct auth_session_info **_session_info) +{ + return _auth_system_session_info(parent_ctx, + lp_ctx, + lp_parm_bool(lp_ctx, NULL, "system", "anonymous", false), + _session_info); +} + +NTSTATUS auth_system_server_info(TALLOC_CTX *mem_ctx, const char *netbios_name, + struct auth_serversupplied_info **_server_info) +{ + struct auth_serversupplied_info *server_info; + server_info = talloc(mem_ctx, struct auth_serversupplied_info); + NT_STATUS_HAVE_NO_MEMORY(server_info); + + server_info->account_sid = dom_sid_parse_talloc(server_info, SID_NT_SYSTEM); + NT_STATUS_HAVE_NO_MEMORY(server_info->account_sid); + + /* is this correct? */ + server_info->primary_group_sid = dom_sid_parse_talloc(server_info, SID_BUILTIN_ADMINISTRATORS); + NT_STATUS_HAVE_NO_MEMORY(server_info->primary_group_sid); + + server_info->n_domain_groups = 0; + server_info->domain_groups = NULL; + + /* annoying, but the Anonymous really does have a session key, + and it is all zeros! */ + server_info->user_session_key = data_blob_talloc(server_info, NULL, 16); + NT_STATUS_HAVE_NO_MEMORY(server_info->user_session_key.data); + + server_info->lm_session_key = data_blob_talloc(server_info, NULL, 16); + NT_STATUS_HAVE_NO_MEMORY(server_info->lm_session_key.data); + + data_blob_clear(&server_info->user_session_key); + data_blob_clear(&server_info->lm_session_key); + + server_info->account_name = talloc_strdup(server_info, "SYSTEM"); + NT_STATUS_HAVE_NO_MEMORY(server_info->account_name); + + server_info->domain_name = talloc_strdup(server_info, "NT AUTHORITY"); + NT_STATUS_HAVE_NO_MEMORY(server_info->domain_name); + + server_info->full_name = talloc_strdup(server_info, "System"); + NT_STATUS_HAVE_NO_MEMORY(server_info->full_name); + + server_info->logon_script = talloc_strdup(server_info, ""); + NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script); + + server_info->profile_path = talloc_strdup(server_info, ""); + NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path); + + server_info->home_directory = talloc_strdup(server_info, ""); + NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory); + + server_info->home_drive = talloc_strdup(server_info, ""); + NT_STATUS_HAVE_NO_MEMORY(server_info->home_drive); + + server_info->logon_server = talloc_strdup(server_info, netbios_name); + NT_STATUS_HAVE_NO_MEMORY(server_info->logon_server); + + server_info->last_logon = 0; + server_info->last_logoff = 0; + server_info->acct_expiry = 0; + server_info->last_password_change = 0; + server_info->allow_password_change = 0; + server_info->force_password_change = 0; + + server_info->logon_count = 0; + server_info->bad_password_count = 0; + + server_info->acct_flags = ACB_NORMAL; + + server_info->authenticated = true; + + *_server_info = server_info; + + return NT_STATUS_OK; +} + + |