diff options
Diffstat (limited to 'source4/auth/ntlm/auth_sam.c')
| -rw-r--r-- | source4/auth/ntlm/auth_sam.c | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/source4/auth/ntlm/auth_sam.c b/source4/auth/ntlm/auth_sam.c new file mode 100644 index 0000000000..2c13cd963d --- /dev/null +++ b/source4/auth/ntlm/auth_sam.c @@ -0,0 +1,449 @@ +/* + Unix SMB/CIFS implementation. + Password and authentication handling + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2004 + Copyright (C) Gerald Carter 2003 + 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 "librpc/gen_ndr/ndr_netlogon.h" +#include "system/time.h" +#include "lib/ldb/include/ldb.h" +#include "util/util_ldb.h" +#include "auth/auth.h" +#include "auth/ntlm/ntlm_check.h" +#include "auth/ntlm/auth_proto.h" +#include "auth/auth_sam.h" +#include "dsdb/samdb/samdb.h" +#include "libcli/security/security.h" +#include "libcli/ldap/ldap_ndr.h" +#include "param/param.h" + +extern const char *user_attrs[]; +extern const char *domain_ref_attrs[]; + +/**************************************************************************** + Look for the specified user in the sam, return ldb result structures +****************************************************************************/ + +static NTSTATUS authsam_search_account(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx, + const char *account_name, + const char *domain_name, + struct ldb_message ***ret_msgs, + struct ldb_message ***ret_msgs_domain_ref) +{ + struct ldb_message **msgs_tmp; + struct ldb_message **msgs; + struct ldb_message **msgs_domain_ref; + struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx); + + int ret; + int ret_domain; + + struct ldb_dn *domain_dn = NULL; + + if (domain_name) { + domain_dn = samdb_domain_to_dn(sam_ctx, mem_ctx, domain_name); + if (!domain_dn) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + } + + /* pull the user attributes */ + ret = gendb_search(sam_ctx, mem_ctx, domain_dn, &msgs, user_attrs, + "(&(sAMAccountName=%s)(objectclass=user))", + ldb_binary_encode_string(mem_ctx, account_name)); + if (ret == -1) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + if (ret == 0) { + DEBUG(3,("sam_search_user: Couldn't find user [%s\\%s] in samdb, under %s\n", + domain_name, account_name, ldb_dn_get_linearized(domain_dn))); + return NT_STATUS_NO_SUCH_USER; + } + + if (ret > 1) { + DEBUG(0,("Found %d records matching user [%s]\n", ret, account_name)); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + if (!domain_dn) { + struct dom_sid *domain_sid; + + domain_sid = samdb_result_sid_prefix(mem_ctx, msgs[0], "objectSid"); + if (!domain_sid) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + /* find the domain's DN */ + ret = gendb_search(sam_ctx, mem_ctx, NULL, &msgs_tmp, NULL, + "(&(objectSid=%s)(objectClass=domain))", + ldap_encode_ndr_dom_sid(mem_ctx, domain_sid)); + if (ret == -1) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + if (ret == 0) { + DEBUG(3,("check_sam_security: Couldn't find domain_sid [%s] in passdb file.\n", + dom_sid_string(mem_ctx, domain_sid))); + return NT_STATUS_NO_SUCH_USER; + } + + if (ret > 1) { + DEBUG(0,("Found %d records matching domain_sid [%s]\n", + ret, dom_sid_string(mem_ctx, domain_sid))); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + domain_dn = msgs_tmp[0]->dn; + } + + ret_domain = gendb_search(sam_ctx, mem_ctx, partitions_basedn, &msgs_domain_ref, domain_ref_attrs, + "(nCName=%s)", ldb_dn_get_linearized(domain_dn)); + if (ret_domain == -1) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + if (ret_domain == 0) { + DEBUG(3,("check_sam_security: Couldn't find domain [%s] in passdb file.\n", + ldb_dn_get_linearized(msgs_tmp[0]->dn))); + return NT_STATUS_NO_SUCH_USER; + } + + if (ret_domain > 1) { + DEBUG(0,("Found %d records matching domain [%s]\n", + ret_domain, ldb_dn_get_linearized(msgs_tmp[0]->dn))); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + *ret_msgs = msgs; + *ret_msgs_domain_ref = msgs_domain_ref; + + return NT_STATUS_OK; +} + +/**************************************************************************** + Do a specific test for an smb password being correct, given a smb_password and + the lanman and NT responses. +****************************************************************************/ +static NTSTATUS authsam_password_ok(struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, + uint16_t acct_flags, + const struct samr_Password *lm_pwd, + const struct samr_Password *nt_pwd, + const struct auth_usersupplied_info *user_info, + DATA_BLOB *user_sess_key, + DATA_BLOB *lm_sess_key) +{ + NTSTATUS status; + + if (acct_flags & ACB_PWNOTREQ) { + if (lp_null_passwords(auth_context->lp_ctx)) { + DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", + user_info->mapped.account_name)); + return NT_STATUS_OK; + } else { + DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", + user_info->mapped.account_name)); + return NT_STATUS_LOGON_FAILURE; + } + } + + switch (user_info->password_state) { + case AUTH_PASSWORD_PLAIN: + { + const struct auth_usersupplied_info *user_info_temp; + status = encrypt_user_info(mem_ctx, auth_context, + AUTH_PASSWORD_HASH, + user_info, &user_info_temp); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1, ("Failed to convert plaintext password to password HASH: %s\n", nt_errstr(status))); + return status; + } + user_info = user_info_temp; + + /*fall through*/ + } + case AUTH_PASSWORD_HASH: + *lm_sess_key = data_blob(NULL, 0); + *user_sess_key = data_blob(NULL, 0); + status = hash_password_check(mem_ctx, + auth_context->lp_ctx, + user_info->password.hash.lanman, + user_info->password.hash.nt, + user_info->mapped.account_name, + lm_pwd, nt_pwd); + NT_STATUS_NOT_OK_RETURN(status); + break; + + case AUTH_PASSWORD_RESPONSE: + status = ntlm_password_check(mem_ctx, + auth_context->lp_ctx, + user_info->logon_parameters, + &auth_context->challenge.data, + &user_info->password.response.lanman, + &user_info->password.response.nt, + user_info->mapped.account_name, + user_info->client.account_name, + user_info->client.domain_name, + lm_pwd, nt_pwd, + user_sess_key, lm_sess_key); + NT_STATUS_NOT_OK_RETURN(status); + break; + } + + if (user_sess_key && user_sess_key->data) { + talloc_steal(auth_context, user_sess_key->data); + } + if (lm_sess_key && lm_sess_key->data) { + talloc_steal(auth_context, lm_sess_key->data); + } + + return NT_STATUS_OK; +} + + + +static NTSTATUS authsam_authenticate(struct auth_context *auth_context, + TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx, + struct ldb_message **msgs, + struct ldb_message **msgs_domain_ref, + const struct auth_usersupplied_info *user_info, + DATA_BLOB *user_sess_key, DATA_BLOB *lm_sess_key) +{ + struct samr_Password *lm_pwd, *nt_pwd; + NTSTATUS nt_status; + struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msgs_domain_ref[0], "nCName", NULL); + + uint16_t acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msgs[0], domain_dn); + + /* Quit if the account was locked out. */ + if (acct_flags & ACB_AUTOLOCK) { + DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", + user_info->mapped.account_name)); + return NT_STATUS_ACCOUNT_LOCKED_OUT; + } + + /* You can only do an interactive login to normal accounts */ + if (user_info->flags & USER_INFO_INTERACTIVE_LOGON) { + if (!(acct_flags & ACB_NORMAL)) { + return NT_STATUS_NO_SUCH_USER; + } + } + + nt_status = samdb_result_passwords(mem_ctx, msgs[0], &lm_pwd, &nt_pwd); + NT_STATUS_NOT_OK_RETURN(nt_status); + + nt_status = authsam_password_ok(auth_context, mem_ctx, + acct_flags, lm_pwd, nt_pwd, + user_info, user_sess_key, lm_sess_key); + NT_STATUS_NOT_OK_RETURN(nt_status); + + nt_status = authsam_account_ok(mem_ctx, sam_ctx, + user_info->logon_parameters, + msgs[0], + msgs_domain_ref[0], + user_info->workstation_name, + user_info->mapped.account_name); + + return nt_status; +} + + + +static NTSTATUS authsam_check_password_internals(struct auth_method_context *ctx, + TALLOC_CTX *mem_ctx, + const char *domain, + const struct auth_usersupplied_info *user_info, + struct auth_serversupplied_info **server_info) +{ + NTSTATUS nt_status; + const char *account_name = user_info->mapped.account_name; + struct ldb_message **msgs; + struct ldb_message **domain_ref_msgs; + struct ldb_context *sam_ctx; + DATA_BLOB user_sess_key, lm_sess_key; + TALLOC_CTX *tmp_ctx; + + if (!account_name || !*account_name) { + /* 'not for me' */ + return NT_STATUS_NOT_IMPLEMENTED; + } + + tmp_ctx = talloc_new(mem_ctx); + if (!tmp_ctx) { + return NT_STATUS_NO_MEMORY; + } + + sam_ctx = samdb_connect(tmp_ctx, ctx->auth_ctx->event_ctx, ctx->auth_ctx->lp_ctx, system_session(mem_ctx, ctx->auth_ctx->lp_ctx)); + if (sam_ctx == NULL) { + talloc_free(tmp_ctx); + return NT_STATUS_INVALID_SYSTEM_SERVICE; + } + + nt_status = authsam_search_account(tmp_ctx, sam_ctx, account_name, domain, &msgs, &domain_ref_msgs); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(tmp_ctx); + return nt_status; + } + + nt_status = authsam_authenticate(ctx->auth_ctx, tmp_ctx, sam_ctx, msgs, domain_ref_msgs, user_info, + &user_sess_key, &lm_sess_key); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(tmp_ctx); + return nt_status; + } + + nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(ctx->auth_ctx->lp_ctx), + msgs[0], domain_ref_msgs[0], + user_sess_key, lm_sess_key, + server_info); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(tmp_ctx); + return nt_status; + } + + talloc_steal(mem_ctx, *server_info); + talloc_free(tmp_ctx); + + return NT_STATUS_OK; +} + +static NTSTATUS authsam_ignoredomain_want_check(struct auth_method_context *ctx, + TALLOC_CTX *mem_ctx, + const struct auth_usersupplied_info *user_info) +{ + if (!user_info->mapped.account_name || !*user_info->mapped.account_name) { + return NT_STATUS_NOT_IMPLEMENTED; + } + + return NT_STATUS_OK; +} + +static NTSTATUS authsam_ignoredomain_check_password(struct auth_method_context *ctx, + TALLOC_CTX *mem_ctx, + const struct auth_usersupplied_info *user_info, + struct auth_serversupplied_info **server_info) +{ + return authsam_check_password_internals(ctx, mem_ctx, NULL, user_info, server_info); +} + +/**************************************************************************** +Check SAM security (above) but with a few extra checks. +****************************************************************************/ +static NTSTATUS authsam_want_check(struct auth_method_context *ctx, + TALLOC_CTX *mem_ctx, + const struct auth_usersupplied_info *user_info) +{ + bool is_local_name, is_my_domain; + + if (!user_info->mapped.account_name || !*user_info->mapped.account_name) { + return NT_STATUS_NOT_IMPLEMENTED; + } + + is_local_name = lp_is_myname(ctx->auth_ctx->lp_ctx, + user_info->mapped.domain_name); + is_my_domain = lp_is_mydomain(ctx->auth_ctx->lp_ctx, + user_info->mapped.domain_name); + + /* check whether or not we service this domain/workgroup name */ + switch (lp_server_role(ctx->auth_ctx->lp_ctx)) { + case ROLE_STANDALONE: + return NT_STATUS_OK; + + case ROLE_DOMAIN_MEMBER: + if (!is_local_name) { + DEBUG(6,("authsam_check_password: %s is not one of my local names (DOMAIN_MEMBER)\n", + user_info->mapped.domain_name)); + return NT_STATUS_NOT_IMPLEMENTED; + } + return NT_STATUS_OK; + + case ROLE_DOMAIN_CONTROLLER: + if (!is_local_name && !is_my_domain) { + DEBUG(6,("authsam_check_password: %s is not one of my local names or domain name (DC)\n", + user_info->mapped.domain_name)); + return NT_STATUS_NOT_IMPLEMENTED; + } + return NT_STATUS_OK; + } + + DEBUG(6,("authsam_check_password: lp_server_role() has an undefined value\n")); + return NT_STATUS_NOT_IMPLEMENTED; +} + +/**************************************************************************** +Check SAM security (above) but with a few extra checks. +****************************************************************************/ +static NTSTATUS authsam_check_password(struct auth_method_context *ctx, + TALLOC_CTX *mem_ctx, + const struct auth_usersupplied_info *user_info, + struct auth_serversupplied_info **server_info) +{ + const char *domain; + + /* check whether or not we service this domain/workgroup name */ + switch (lp_server_role(ctx->auth_ctx->lp_ctx)) { + case ROLE_STANDALONE: + case ROLE_DOMAIN_MEMBER: + domain = lp_netbios_name(ctx->auth_ctx->lp_ctx); + break; + + case ROLE_DOMAIN_CONTROLLER: + domain = lp_workgroup(ctx->auth_ctx->lp_ctx); + break; + + default: + return NT_STATUS_NO_SUCH_USER; + } + + return authsam_check_password_internals(ctx, mem_ctx, domain, user_info, server_info); +} + +static const struct auth_operations sam_ignoredomain_ops = { + .name = "sam_ignoredomain", + .get_challenge = auth_get_challenge_not_implemented, + .want_check = authsam_ignoredomain_want_check, + .check_password = authsam_ignoredomain_check_password +}; + +static const struct auth_operations sam_ops = { + .name = "sam", + .get_challenge = auth_get_challenge_not_implemented, + .want_check = authsam_want_check, + .check_password = authsam_check_password +}; + +_PUBLIC_ NTSTATUS auth_sam_init(void) +{ + NTSTATUS ret; + + ret = auth_register(&sam_ops); + if (!NT_STATUS_IS_OK(ret)) { + DEBUG(0,("Failed to register 'sam' auth backend!\n")); + return ret; + } + + ret = auth_register(&sam_ignoredomain_ops); + if (!NT_STATUS_IS_OK(ret)) { + DEBUG(0,("Failed to register 'sam_ignoredomain' auth backend!\n")); + return ret; + } + + return ret; +} |