From 8daa83a594a2e98f39d764422bfbdbc62c9efd44 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 19:20:00 +0200 Subject: Adding upstream version 2:4.20.0+dfsg. Signed-off-by: Daniel Baumann --- source3/auth/auth_samba4.c | 401 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 401 insertions(+) create mode 100644 source3/auth/auth_samba4.c (limited to 'source3/auth/auth_samba4.c') diff --git a/source3/auth/auth_samba4.c b/source3/auth/auth_samba4.c new file mode 100644 index 0000000..bae34e5 --- /dev/null +++ b/source3/auth/auth_samba4.c @@ -0,0 +1,401 @@ +/* + Unix SMB/CIFS implementation. + Authenticate against Samba4's auth subsystem + Copyright (C) Volker Lendecke 2008 + Copyright (C) Andrew Bartlett 2010 + + 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 . +*/ + +#include "includes.h" +#include "source3/include/auth.h" +#include "source3/include/messages.h" +#include "source4/auth/auth.h" +#include "auth/auth_sam_reply.h" +#include "param/param.h" +#include "source4/lib/events/events.h" +#include "source4/lib/messaging/messaging.h" +#include "auth/gensec/gensec.h" +#include "auth/credentials/credentials.h" +#include "lib/global_contexts.h" +#include "lib/util/idtree.h" + +#undef DBGC_CLASS +#define DBGC_CLASS DBGC_AUTH + +static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, + struct auth4_context **auth4_context); + +static struct idr_context *task_id_tree; + +static int free_task_id(struct server_id *server_id) +{ + idr_remove(task_id_tree, server_id->task_id); + return 0; +} + +/* Return a server_id with a unique task_id element. Free the + * returned pointer to de-allocate the task_id via a talloc destructor + * (ie, use talloc_free()) */ +static struct server_id *new_server_id_task(TALLOC_CTX *mem_ctx) +{ + struct messaging_context *msg_ctx; + struct server_id *server_id; + int task_id; + if (!task_id_tree) { + task_id_tree = idr_init(NULL); + if (!task_id_tree) { + return NULL; + } + } + + msg_ctx = global_messaging_context(); + if (msg_ctx == NULL) { + return NULL; + } + + server_id = talloc(mem_ctx, struct server_id); + + if (!server_id) { + return NULL; + } + *server_id = messaging_server_id(msg_ctx); + + /* 0 is the default server_id, so we need to start with 1 */ + task_id = idr_get_new_above(task_id_tree, server_id, 1, INT32_MAX); + + if (task_id == -1) { + talloc_free(server_id); + return NULL; + } + + talloc_set_destructor(server_id, free_task_id); + server_id->task_id = task_id; + return server_id; +} + +/* + * This module is not an ordinary authentication module. It is really + * a way to redirect the whole authentication and authorization stack + * to use the source4 auth code, not a way to just handle NTLM + * authentication. + * + * See the comments above each function for how that hook changes the + * behaviour. + */ + +/* + * This hook is currently used by winbindd only, as all other NTLM + * logins go via the hooks provided by make_auth4_context_s4() below. + * + * This is only left in case we find a way that it might become useful + * in future. Importantly, this routine returns the information + * needed for a NETLOGON SamLogon, not what is needed to establish a + * session. + * + * We expect we may use this hook in the source3/ winbind when this + * services the AD DC. It is tested via pdbtest. + */ + +static NTSTATUS check_samba4_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 **pserver_info) +{ + TALLOC_CTX *frame = talloc_stackframe(); + struct netr_SamInfo3 *info3 = NULL; + NTSTATUS nt_status; + struct auth_user_info_dc *user_info_dc; + struct auth4_context *auth4_context; + uint8_t authoritative = 1; + struct auth_serversupplied_info *server_info = NULL; + + nt_status = make_auth4_context_s4(auth_context, mem_ctx, &auth4_context); + if (!NT_STATUS_IS_OK(nt_status)) { + TALLOC_FREE(frame); + goto done; + } + + nt_status = auth_context_set_challenge(auth4_context, auth_context->challenge.data, "auth_samba4"); + if (!NT_STATUS_IS_OK(nt_status)) { + TALLOC_FREE(auth4_context); + TALLOC_FREE(frame); + return nt_status; + } + + nt_status = auth_check_password(auth4_context, auth4_context, user_info, + &user_info_dc, &authoritative); + if (!NT_STATUS_IS_OK(nt_status)) { + if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) && + authoritative == 0) + { + nt_status = NT_STATUS_NOT_IMPLEMENTED; + } + TALLOC_FREE(auth4_context); + TALLOC_FREE(frame); + return nt_status; + } + + nt_status = auth_convert_user_info_dc_saminfo3(mem_ctx, + user_info_dc, + AUTH_INCLUDE_RESOURCE_GROUPS, + &info3, + NULL); + if (NT_STATUS_IS_OK(nt_status)) { + /* We need the strings from the server_info to be valid as long as the info3 is around */ + talloc_steal(info3, user_info_dc); + } + talloc_free(auth4_context); + + if (!NT_STATUS_IS_OK(nt_status)) { + goto done; + } + + if (user_info->flags & USER_INFO_INFO3_AND_NO_AUTHZ) { + server_info = make_server_info(mem_ctx); + if (server_info == NULL) { + nt_status = NT_STATUS_NO_MEMORY; + goto done; + } + server_info->info3 = talloc_move(server_info, &info3); + } else { + nt_status = make_server_info_info3( + mem_ctx, + user_info->client.account_name, + user_info->mapped.domain_name, + &server_info, + info3); + if (!NT_STATUS_IS_OK(nt_status)) { + DEBUG(10, ("make_server_info_info3 failed: %s\n", + nt_errstr(nt_status))); + goto done; + } + } + + *pserver_info = server_info; + nt_status = NT_STATUS_OK; + + done: + TALLOC_FREE(frame); + return nt_status; +} + +/* + * Hook to allow the source4 set of GENSEC modules to handle + * blob-based authentication mechanisms, without directly linking the + * mechanism code. + * + * This may eventually go away, when the GSSAPI acceptors are merged, + * when we will just rely on the make_auth4_context_s4 hook instead. + * + * Even for NTLMSSP, which has a common module, significant parts of + * the behaviour are overridden here, because it uses the source4 NTLM + * stack and the source4 mapping between the PAC/SamLogon response and + * the local token. + * + * It is important to override all this to ensure that the exact same + * token is generated and used in the SMB and LDAP servers, for NTLM + * and for Kerberos. + */ +static NTSTATUS prepare_gensec(const struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, + struct gensec_security **gensec_context) +{ + NTSTATUS status; + struct loadparm_context *lp_ctx; + struct tevent_context *event_ctx; + TALLOC_CTX *frame = talloc_stackframe(); + struct gensec_security *gensec_ctx; + struct imessaging_context *msg_ctx; + struct cli_credentials *server_credentials; + struct server_id *server_id; + + lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers()); + if (lp_ctx == NULL) { + DEBUG(1, ("loadparm_init_s3 failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + event_ctx = s4_event_context_init(frame); + if (event_ctx == NULL) { + DEBUG(1, ("s4_event_context_init failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + server_id = new_server_id_task(frame); + if (server_id == NULL) { + DEBUG(1, ("new_server_id_task failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + msg_ctx = imessaging_init_discard_incoming(frame, + lp_ctx, + *server_id, + event_ctx); + if (msg_ctx == NULL) { + DEBUG(1, ("imessaging_init_discard_incoming failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + talloc_reparent(frame, msg_ctx, server_id); + + server_credentials + = cli_credentials_init_server(frame, lp_ctx); + if (!server_credentials) { + DEBUG(1, ("Failed to init server credentials\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + status = samba_server_gensec_start(mem_ctx, + event_ctx, msg_ctx, + lp_ctx, server_credentials, "cifs", + &gensec_ctx); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status))); + TALLOC_FREE(frame); + return status; + } + + talloc_reparent(frame, gensec_ctx, msg_ctx); + talloc_reparent(frame, gensec_ctx, event_ctx); + talloc_reparent(frame, gensec_ctx, lp_ctx); + talloc_reparent(frame, gensec_ctx, server_credentials); + + gensec_want_feature(gensec_ctx, GENSEC_FEATURE_SESSION_KEY); + gensec_want_feature(gensec_ctx, GENSEC_FEATURE_UNIX_TOKEN); + + *gensec_context = gensec_ctx; + TALLOC_FREE(frame); + return status; +} + +/* + * Hook to allow handling of NTLM authentication for AD operation + * without directly linking the s4 auth stack + * + * This ensures we use the source4 authentication stack, as well as + * the authorization stack to create the user's token. This ensures + * consistency between NTLM logins and NTLMSSP logins, as NTLMSSP is + * handled by the hook above. + */ +static NTSTATUS make_auth4_context_s4(const struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, + struct auth4_context **auth4_context) +{ + NTSTATUS status; + struct loadparm_context *lp_ctx; + struct tevent_context *event_ctx; + TALLOC_CTX *frame = talloc_stackframe(); + struct imessaging_context *msg_ctx; + struct server_id *server_id; + + lp_ctx = loadparm_init_s3(frame, loadparm_s3_helpers()); + if (lp_ctx == NULL) { + DEBUG(1, ("loadparm_init_s3 failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + event_ctx = s4_event_context_init(frame); + if (event_ctx == NULL) { + DEBUG(1, ("s4_event_context_init failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + server_id = new_server_id_task(frame); + if (server_id == NULL) { + DEBUG(1, ("new_server_id_task failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + + msg_ctx = imessaging_init_discard_incoming(frame, + lp_ctx, + *server_id, + event_ctx); + if (msg_ctx == NULL) { + DEBUG(1, ("imessaging_init_discard_incoming failed\n")); + TALLOC_FREE(frame); + return NT_STATUS_INVALID_SERVER_STATE; + } + talloc_reparent(frame, msg_ctx, server_id); + + /* Allow forcing a specific auth4 module */ + if (!auth_context->forced_samba4_methods) { + status = auth_context_create(mem_ctx, + event_ctx, + msg_ctx, + lp_ctx, + auth4_context); + } else { + const char * const *forced_auth_methods = (const char * const *)str_list_make(mem_ctx, auth_context->forced_samba4_methods, NULL); + status = auth_context_create_methods(mem_ctx, forced_auth_methods, event_ctx, msg_ctx, lp_ctx, NULL, auth4_context); + } + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Failed to start auth server code: %s\n", nt_errstr(status))); + TALLOC_FREE(frame); + return status; + } + + talloc_reparent(frame, *auth4_context, msg_ctx); + talloc_reparent(frame, *auth4_context, event_ctx); + talloc_reparent(frame, *auth4_context, lp_ctx); + + TALLOC_FREE(frame); + return status; +} + +/* module initialisation */ +static NTSTATUS auth_init_samba4(struct auth_context *auth_context, + const char *param, + struct auth_methods **auth_method) +{ + struct auth_methods *result; + + gensec_init(); + + result = talloc_zero(auth_context, struct auth_methods); + if (result == NULL) { + return NT_STATUS_NO_MEMORY; + } + result->name = "samba4"; + result->auth = check_samba4_security; + result->prepare_gensec = prepare_gensec; + result->make_auth4_context = make_auth4_context_s4; + + if (param && *param) { + auth_context->forced_samba4_methods = talloc_strdup(result, param); + if (!auth_context->forced_samba4_methods) { + return NT_STATUS_NO_MEMORY; + } + } + + *auth_method = result; + return NT_STATUS_OK; +} + +NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx); +NTSTATUS auth_samba4_init(TALLOC_CTX *mem_ctx) +{ + smb_register_auth(AUTH_INTERFACE_VERSION, "samba4", + auth_init_samba4); + return NT_STATUS_OK; +} -- cgit v1.2.3