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Diffstat (limited to 'source3/auth/token_util.c')
| -rw-r--r-- | source3/auth/token_util.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/source3/auth/token_util.c b/source3/auth/token_util.c new file mode 100644 index 0000000000..d6cd2ea3a8 --- /dev/null +++ b/source3/auth/token_util.c @@ -0,0 +1,556 @@ +/* + * 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 + * Copyright (C) Michael Adam 2007 + * + * 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/>. + */ + +/* functions moved from auth/auth_util.c to minimize linker deps */ + +#include "includes.h" + +/**************************************************************************** + Check for a SID in an NT_USER_TOKEN +****************************************************************************/ + +bool nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token ) +{ + int i; + + if ( !sid || !token ) + return False; + + for ( i=0; i<token->num_sids; i++ ) { + if ( sid_equal( sid, &token->user_sids[i] ) ) + return True; + } + + return False; +} + +bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid ) +{ + DOM_SID domain_sid; + + /* if we are a domain member, the get the domain SID, else for + a DC or standalone server, use our own SID */ + + if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) { + if ( !secrets_fetch_domain_sid( lp_workgroup(), + &domain_sid ) ) { + DEBUG(1,("nt_token_check_domain_rid: Cannot lookup " + "SID for domain [%s]\n", lp_workgroup())); + return False; + } + } + else + sid_copy( &domain_sid, get_global_sam_sid() ); + + sid_append_rid( &domain_sid, rid ); + + return nt_token_check_sid( &domain_sid, token );\ +} + +/****************************************************************************** + Create a token for the root user to be used internally by smbd. + This is similar to running under the context of the LOCAL_SYSTEM account + in Windows. This is a read-only token. Do not modify it or free() it. + Create a copy if your need to change it. +******************************************************************************/ + +NT_USER_TOKEN *get_root_nt_token( void ) +{ + struct nt_user_token *token = NULL; + DOM_SID u_sid, g_sid; + struct passwd *pw; + void *cache_data; + + cache_data = memcache_lookup_talloc( + NULL, SINGLETON_CACHE_TALLOC, + data_blob_string_const("root_nt_token")); + + if (cache_data != NULL) { + return talloc_get_type_abort( + cache_data, struct nt_user_token); + } + + if ( !(pw = sys_getpwnam( "root" )) ) { + DEBUG(0,("get_root_nt_token: getpwnam(\"root\") failed!\n")); + return NULL; + } + + /* get the user and primary group SIDs; although the + BUILTIN\Administrators SId is really the one that matters here */ + + uid_to_sid(&u_sid, pw->pw_uid); + gid_to_sid(&g_sid, pw->pw_gid); + + token = create_local_nt_token(NULL, &u_sid, False, + 1, &global_sid_Builtin_Administrators); + + token->privileges = se_disk_operators; + + memcache_add_talloc( + NULL, SINGLETON_CACHE_TALLOC, + data_blob_string_const("root_nt_token"), token); + + return token; +} + + +/* + * Add alias SIDs from memberships within the partially created token SID list + */ + +NTSTATUS add_aliases(const DOM_SID *domain_sid, + struct nt_user_token *token) +{ + uint32 *aliases; + size_t i, num_aliases; + NTSTATUS status; + TALLOC_CTX *tmp_ctx; + + if (!(tmp_ctx = talloc_init("add_aliases"))) { + return NT_STATUS_NO_MEMORY; + } + + aliases = NULL; + num_aliases = 0; + + status = pdb_enum_alias_memberships(tmp_ctx, domain_sid, + token->user_sids, + token->num_sids, + &aliases, &num_aliases); + + if (!NT_STATUS_IS_OK(status)) { + DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n", + nt_errstr(status))); + goto done; + } + + for (i=0; i<num_aliases; i++) { + DOM_SID alias_sid; + sid_compose(&alias_sid, domain_sid, aliases[i]); + status = add_sid_to_array_unique(token, &alias_sid, + &token->user_sids, + &token->num_sids); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("add_sid_to_array failed\n")); + goto done; + } + } + +done: + TALLOC_FREE(tmp_ctx); + return NT_STATUS_OK; +} + +/******************************************************************* +*******************************************************************/ + +static NTSTATUS add_builtin_administrators(struct nt_user_token *token, + const DOM_SID *dom_sid) +{ + DOM_SID domadm; + NTSTATUS status; + + /* nothing to do if we aren't in a domain */ + + if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) { + return NT_STATUS_OK; + } + + /* Find the Domain Admins SID */ + + if ( IS_DC ) { + sid_copy( &domadm, get_global_sam_sid() ); + } else { + sid_copy(&domadm, dom_sid); + } + sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS ); + + /* Add Administrators if the user beloongs to Domain Admins */ + + if ( nt_token_check_sid( &domadm, token ) ) { + status = add_sid_to_array(token, + &global_sid_Builtin_Administrators, + &token->user_sids, &token->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + return NT_STATUS_OK; +} + +/** + * Create the requested BUILTIN if it doesn't already exist. This requires + * winbindd to be running. + * + * @param[in] rid BUILTIN rid to create + * @return Normal NTSTATUS return. + */ +static NTSTATUS create_builtin(uint32 rid) +{ + NTSTATUS status = NT_STATUS_OK; + DOM_SID sid; + gid_t gid; + + if (!sid_compose(&sid, &global_sid_Builtin, rid)) { + return NT_STATUS_NO_SUCH_ALIAS; + } + + if (!sid_to_gid(&sid, &gid)) { + if (!lp_winbind_nested_groups() || !winbind_ping()) { + return NT_STATUS_PROTOCOL_UNREACHABLE; + } + status = pdb_create_builtin_alias(rid); + } + return status; +} + +/** + * Add sid as a member of builtin_sid. + * + * @param[in] builtin_sid An existing builtin group. + * @param[in] dom_sid sid to add as a member of builtin_sid. + * @return Normal NTSTATUS return + */ +static NTSTATUS add_sid_to_builtin(const DOM_SID *builtin_sid, + const DOM_SID *dom_sid) +{ + NTSTATUS status = NT_STATUS_OK; + + if (!dom_sid || !builtin_sid) { + return NT_STATUS_INVALID_PARAMETER; + } + + status = pdb_add_aliasmem(builtin_sid, dom_sid); + + if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) { + DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n", + sid_string_dbg(dom_sid), + sid_string_dbg(builtin_sid))); + return NT_STATUS_OK; + } + + if (!NT_STATUS_IS_OK(status)) { + DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: " + "%s\n", sid_string_dbg(dom_sid), + sid_string_dbg(builtin_sid), nt_errstr(status))); + } + return status; +} + +/******************************************************************* +*******************************************************************/ + +NTSTATUS create_builtin_users(const DOM_SID *dom_sid) +{ + NTSTATUS status; + DOM_SID dom_users; + + status = create_builtin(BUILTIN_ALIAS_RID_USERS); + if ( !NT_STATUS_IS_OK(status) ) { + DEBUG(5,("create_builtin_users: Failed to create Users\n")); + return status; + } + + /* add domain users */ + if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER)) + && sid_compose(&dom_users, dom_sid, DOMAIN_GROUP_RID_USERS)) + { + status = add_sid_to_builtin(&global_sid_Builtin_Users, + &dom_users); + } + + return status; +} + +/******************************************************************* +*******************************************************************/ + +NTSTATUS create_builtin_administrators(const DOM_SID *dom_sid) +{ + NTSTATUS status; + DOM_SID dom_admins, root_sid; + fstring root_name; + enum lsa_SidType type; + TALLOC_CTX *ctx; + bool ret; + + status = create_builtin(BUILTIN_ALIAS_RID_ADMINS); + if ( !NT_STATUS_IS_OK(status) ) { + DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n")); + return status; + } + + /* add domain admins */ + if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER)) + && sid_compose(&dom_admins, dom_sid, DOMAIN_GROUP_RID_ADMINS)) + { + status = add_sid_to_builtin(&global_sid_Builtin_Administrators, + &dom_admins); + if (!NT_STATUS_IS_OK(status)) { + return status; + } + } + + /* add root */ + if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) { + return NT_STATUS_NO_MEMORY; + } + fstr_sprintf( root_name, "%s\\root", get_global_sam_name() ); + ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL, + &root_sid, &type); + TALLOC_FREE( ctx ); + + if ( ret ) { + status = add_sid_to_builtin(&global_sid_Builtin_Administrators, + &root_sid); + } + + return status; +} + + +/******************************************************************* + Create a NT token for the user, expanding local aliases +*******************************************************************/ + +struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx, + const DOM_SID *user_sid, + bool is_guest, + int num_groupsids, + const DOM_SID *groupsids) +{ + struct nt_user_token *result = NULL; + int i; + NTSTATUS status; + gid_t gid; + DOM_SID dom_sid; + + DEBUG(10, ("Create local NT token for %s\n", + sid_string_dbg(user_sid))); + + if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) { + DEBUG(0, ("talloc failed\n")); + return NULL; + } + + /* Add the user and primary group sid */ + + status = add_sid_to_array(result, user_sid, + &result->user_sids, &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + + /* For guest, num_groupsids may be zero. */ + if (num_groupsids) { + status = add_sid_to_array(result, &groupsids[0], + &result->user_sids, + &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + + /* Add in BUILTIN sids */ + + status = add_sid_to_array(result, &global_sid_World, + &result->user_sids, &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + status = add_sid_to_array(result, &global_sid_Network, + &result->user_sids, &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + + if (is_guest) { + status = add_sid_to_array(result, &global_sid_Builtin_Guests, + &result->user_sids, + &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } else { + status = add_sid_to_array(result, + &global_sid_Authenticated_Users, + &result->user_sids, + &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + + /* Now the SIDs we got from authentication. These are the ones from + * the info3 struct or from the pdb_enum_group_memberships, depending + * on who authenticated the user. + * Note that we start the for loop at "1" here, we already added the + * first group sid as primary above. */ + + for (i=1; i<num_groupsids; i++) { + status = add_sid_to_array_unique(result, &groupsids[i], + &result->user_sids, + &result->num_sids); + if (!NT_STATUS_IS_OK(status)) { + return NULL; + } + } + + /* Deal with the BUILTIN\Administrators group. If the SID can + be resolved then assume that the add_aliasmem( S-1-5-32 ) + handled it. */ + + if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) { + + become_root(); + if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) { + status = NT_STATUS_OK; + DEBUG(3, ("Failed to fetch domain sid for %s\n", + lp_workgroup())); + } else { + status = create_builtin_administrators(&dom_sid); + } + unbecome_root(); + + if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) { + /* Add BUILTIN\Administrators directly to token. */ + status = add_builtin_administrators(result, &dom_sid); + if ( !NT_STATUS_IS_OK(status) ) { + DEBUG(3, ("Failed to check for local " + "Administrators membership (%s)\n", + nt_errstr(status))); + } + } else if (!NT_STATUS_IS_OK(status)) { + DEBUG(2, ("WARNING: Failed to create " + "BUILTIN\\Administrators group! Can " + "Winbind allocate gids?\n")); + } + } + + /* Deal with the BUILTIN\Users group. If the SID can + be resolved then assume that the add_aliasmem( S-1-5-32 ) + handled it. */ + + if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) { + + become_root(); + if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) { + status = NT_STATUS_OK; + DEBUG(3, ("Failed to fetch domain sid for %s\n", + lp_workgroup())); + } else { + status = create_builtin_users(&dom_sid); + } + unbecome_root(); + + if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) && + !NT_STATUS_IS_OK(status)) + { + DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! " + "Can Winbind allocate gids?\n")); + } + } + + /* Deal with local groups */ + + if (lp_winbind_nested_groups()) { + + become_root(); + + /* Now add the aliases. First the one from our local SAM */ + + status = add_aliases(get_global_sam_sid(), result); + + if (!NT_STATUS_IS_OK(status)) { + unbecome_root(); + TALLOC_FREE(result); + return NULL; + } + + /* Finally the builtin ones */ + + status = add_aliases(&global_sid_Builtin, result); + + if (!NT_STATUS_IS_OK(status)) { + unbecome_root(); + TALLOC_FREE(result); + return NULL; + } + + unbecome_root(); + } + + + get_privileges_for_sids(&result->privileges, result->user_sids, + result->num_sids); + return result; +} + +/**************************************************************************** + 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_dbg(&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_dbg(&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])); +} + +/* END */ |