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Diffstat (limited to 'source4/auth/sam.c')
| -rw-r--r-- | source4/auth/sam.c | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/source4/auth/sam.c b/source4/auth/sam.c new file mode 100644 index 0000000000..a2090afcdc --- /dev/null +++ b/source4/auth/sam.c @@ -0,0 +1,470 @@ +/* + 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 "system/time.h" +#include "auth/auth.h" +#include <ldb.h> +#include "util/util_ldb.h" +#include "dsdb/samdb/samdb.h" +#include "libcli/security/security.h" +#include "libcli/ldap/ldap.h" +#include "librpc/gen_ndr/ndr_netlogon.h" +#include "param/param.h" + +const char *user_attrs[] = { + /* required for the krb5 kdc */ + "objectClass", + "sAMAccountName", + "userPrincipalName", + "servicePrincipalName", + "msDS-KeyVersionNumber", + "supplementalCredentials", + + /* passwords */ + "dBCSPwd", + "unicodePwd", + + "userAccountControl", + + "pwdLastSet", + "accountExpires", + "logonHours", + "objectSid", + + /* check 'allowed workstations' */ + "userWorkstations", + + /* required for server_info, not access control: */ + "displayName", + "scriptPath", + "profilePath", + "homeDirectory", + "homeDrive", + "lastLogon", + "lastLogoff", + "accountExpires", + "badPwdCount", + "logonCount", + "primaryGroupID", + NULL, +}; + +const char *domain_ref_attrs[] = {"nETBIOSName", "nCName", + "dnsRoot", "objectClass", NULL}; + +/**************************************************************************** + Check if a user is allowed to logon at this time. Note this is the + servers local time, as logon hours are just specified as a weekly + bitmask. +****************************************************************************/ + +static bool logon_hours_ok(struct ldb_message *msg, const char *name_for_logs) +{ + /* In logon hours first bit is Sunday from 12AM to 1AM */ + const struct ldb_val *hours; + struct tm *utctime; + time_t lasttime; + const char *asct; + uint8_t bitmask, bitpos; + + hours = ldb_msg_find_ldb_val(msg, "logonHours"); + if (!hours) { + DEBUG(5,("logon_hours_ok: No hours restrictions for user %s\n", name_for_logs)); + return true; + } + + if (hours->length != 168/8) { + DEBUG(5,("logon_hours_ok: malformed logon hours restrictions for user %s\n", name_for_logs)); + return true; + } + + lasttime = time(NULL); + utctime = gmtime(&lasttime); + if (!utctime) { + DEBUG(1, ("logon_hours_ok: failed to get gmtime. Failing logon for user %s\n", + name_for_logs)); + return false; + } + + /* find the corresponding byte and bit */ + bitpos = (utctime->tm_wday * 24 + utctime->tm_hour) % 168; + bitmask = 1 << (bitpos % 8); + + if (! (hours->data[bitpos/8] & bitmask)) { + struct tm *t = localtime(&lasttime); + if (!t) { + asct = "INVALID TIME"; + } else { + asct = asctime(t); + if (!asct) { + asct = "INVALID TIME"; + } + } + + DEBUG(1, ("logon_hours_ok: Account for user %s not allowed to " + "logon at this time (%s).\n", + name_for_logs, asct )); + return false; + } + + asct = asctime(utctime); + DEBUG(5,("logon_hours_ok: user %s allowed to logon at this time (%s)\n", + name_for_logs, asct ? asct : "UNKNOWN TIME" )); + + return true; +} + +/**************************************************************************** + Do a specific test for a SAM_ACCOUNT being vaild for this connection + (ie not disabled, expired and the like). +****************************************************************************/ +_PUBLIC_ NTSTATUS authsam_account_ok(TALLOC_CTX *mem_ctx, + struct ldb_context *sam_ctx, + uint32_t logon_parameters, + struct ldb_message *msg, + struct ldb_message *msg_domain_ref, + const char *logon_workstation, + const char *name_for_logs) +{ + uint16_t acct_flags; + const char *workstation_list; + NTTIME acct_expiry; + NTTIME must_change_time; + + struct ldb_dn *domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", ldb_dn_new(mem_ctx, sam_ctx, NULL)); + + NTTIME now; + DEBUG(4,("authsam_account_ok: Checking SMB password for user %s\n", name_for_logs)); + + acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, msg, domain_dn); + + acct_expiry = samdb_result_account_expires(msg); + + /* Check for when we must change this password, taking the + * userAccountControl flags into account */ + must_change_time = samdb_result_force_password_change(sam_ctx, mem_ctx, + domain_dn, msg); + + workstation_list = samdb_result_string(msg, "userWorkstations", NULL); + + /* Quit if the account was disabled. */ + if (acct_flags & ACB_DISABLED) { + DEBUG(1,("authsam_account_ok: Account for user '%s' was disabled.\n", name_for_logs)); + return NT_STATUS_ACCOUNT_DISABLED; + } + + /* Quit if the account was locked out. */ + if (acct_flags & ACB_AUTOLOCK) { + DEBUG(1,("authsam_account_ok: Account for user %s was locked out.\n", name_for_logs)); + return NT_STATUS_ACCOUNT_LOCKED_OUT; + } + + /* Test account expire time */ + unix_to_nt_time(&now, time(NULL)); + if (now > acct_expiry) { + DEBUG(1,("authsam_account_ok: Account for user '%s' has expired.\n", name_for_logs)); + DEBUG(3,("authsam_account_ok: Account expired at '%s'.\n", + nt_time_string(mem_ctx, acct_expiry))); + return NT_STATUS_ACCOUNT_EXPIRED; + } + + /* check for immediate expiry "must change at next logon" */ + if (must_change_time == 0) { + DEBUG(1,("sam_account_ok: Account for user '%s' password must change!.\n", + name_for_logs)); + return NT_STATUS_PASSWORD_MUST_CHANGE; + } + + /* check for expired password */ + if (must_change_time < now) { + DEBUG(1,("sam_account_ok: Account for user '%s' password expired!.\n", + name_for_logs)); + DEBUG(1,("sam_account_ok: Password expired at '%s' unix time.\n", + nt_time_string(mem_ctx, must_change_time))); + return NT_STATUS_PASSWORD_EXPIRED; + } + + /* Test workstation. Workstation list is comma separated. */ + if (logon_workstation && workstation_list && *workstation_list) { + bool invalid_ws = true; + int i; + const char **workstations = str_list_make(mem_ctx, workstation_list, ","); + + for (i = 0; workstations && workstations[i]; i++) { + DEBUG(10,("sam_account_ok: checking for workstation match '%s' and '%s'\n", + workstations[i], logon_workstation)); + + if (strequal(workstations[i], logon_workstation)) { + invalid_ws = false; + break; + } + } + + talloc_free(workstations); + + if (invalid_ws) { + return NT_STATUS_INVALID_WORKSTATION; + } + } + + if (!logon_hours_ok(msg, name_for_logs)) { + return NT_STATUS_INVALID_LOGON_HOURS; + } + + if (acct_flags & ACB_DOMTRUST) { + DEBUG(2,("sam_account_ok: Domain trust account %s denied by server\n", name_for_logs)); + return NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT; + } + + if (!(logon_parameters & MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT)) { + if (acct_flags & ACB_SVRTRUST) { + DEBUG(2,("sam_account_ok: Server trust account %s denied by server\n", name_for_logs)); + return NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT; + } + } + if (!(logon_parameters & MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT)) { + if (acct_flags & ACB_WSTRUST) { + DEBUG(4,("sam_account_ok: Wksta trust account %s denied by server\n", name_for_logs)); + return NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT; + } + } + + return NT_STATUS_OK; +} + +_PUBLIC_ NTSTATUS authsam_make_server_info(TALLOC_CTX *mem_ctx, struct ldb_context *sam_ctx, + const char *netbios_name, + struct ldb_message *msg, + struct ldb_message *msg_domain_ref, + DATA_BLOB user_sess_key, DATA_BLOB lm_sess_key, + struct auth_serversupplied_info **_server_info) +{ + struct auth_serversupplied_info *server_info; + struct ldb_message **group_msgs; + int group_ret; + const char *group_attrs[3] = { "sAMAccountType", "objectSid", NULL }; + /* find list of sids */ + struct dom_sid **groupSIDs = NULL; + struct dom_sid *account_sid; + struct dom_sid *primary_group_sid; + struct ldb_dn *domain_dn; + const char *str; + struct ldb_dn *ncname; + int i; + uint_t rid; + TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx); + + group_ret = gendb_search(sam_ctx, + tmp_ctx, NULL, &group_msgs, group_attrs, + "(&(member=%s)(sAMAccountType=*))", + ldb_dn_get_linearized(msg->dn)); + if (group_ret == -1) { + talloc_free(tmp_ctx); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + server_info = talloc(mem_ctx, struct auth_serversupplied_info); + NT_STATUS_HAVE_NO_MEMORY(server_info); + + if (group_ret > 0) { + groupSIDs = talloc_array(server_info, struct dom_sid *, group_ret); + NT_STATUS_HAVE_NO_MEMORY(groupSIDs); + } + + /* Need to unroll some nested groups, but not aliases */ + for (i = 0; i < group_ret; i++) { + groupSIDs[i] = samdb_result_dom_sid(groupSIDs, + group_msgs[i], "objectSid"); + NT_STATUS_HAVE_NO_MEMORY(groupSIDs[i]); + } + + talloc_free(tmp_ctx); + + account_sid = samdb_result_dom_sid(server_info, msg, "objectSid"); + NT_STATUS_HAVE_NO_MEMORY(account_sid); + + primary_group_sid = dom_sid_dup(server_info, account_sid); + NT_STATUS_HAVE_NO_MEMORY(primary_group_sid); + + rid = samdb_result_uint(msg, "primaryGroupID", ~0); + if (rid == ~0) { + if (group_ret > 0) { + primary_group_sid = groupSIDs[0]; + } else { + primary_group_sid = NULL; + } + } else { + primary_group_sid->sub_auths[primary_group_sid->num_auths-1] = rid; + } + + server_info->account_sid = account_sid; + server_info->primary_group_sid = primary_group_sid; + + server_info->n_domain_groups = group_ret; + server_info->domain_groups = groupSIDs; + + server_info->account_name = talloc_steal(server_info, samdb_result_string(msg, "sAMAccountName", NULL)); + + server_info->domain_name = talloc_steal(server_info, samdb_result_string(msg_domain_ref, "nETBIOSName", NULL)); + + str = samdb_result_string(msg, "displayName", ""); + server_info->full_name = talloc_strdup(server_info, str); + NT_STATUS_HAVE_NO_MEMORY(server_info->full_name); + + str = samdb_result_string(msg, "scriptPath", ""); + server_info->logon_script = talloc_strdup(server_info, str); + NT_STATUS_HAVE_NO_MEMORY(server_info->logon_script); + + str = samdb_result_string(msg, "profilePath", ""); + server_info->profile_path = talloc_strdup(server_info, str); + NT_STATUS_HAVE_NO_MEMORY(server_info->profile_path); + + str = samdb_result_string(msg, "homeDirectory", ""); + server_info->home_directory = talloc_strdup(server_info, str); + NT_STATUS_HAVE_NO_MEMORY(server_info->home_directory); + + str = samdb_result_string(msg, "homeDrive", ""); + server_info->home_drive = talloc_strdup(server_info, str); + 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 = samdb_result_nttime(msg, "lastLogon", 0); + server_info->last_logoff = samdb_result_nttime(msg, "lastLogoff", 0); + server_info->acct_expiry = samdb_result_account_expires(msg); + server_info->last_password_change = samdb_result_nttime(msg, "pwdLastSet", 0); + + ncname = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL); + if (!ncname) { + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + server_info->allow_password_change + = samdb_result_allow_password_change(sam_ctx, mem_ctx, + ncname, msg, "pwdLastSet"); + server_info->force_password_change + = samdb_result_force_password_change(sam_ctx, mem_ctx, + ncname, msg); + + server_info->logon_count = samdb_result_uint(msg, "logonCount", 0); + server_info->bad_password_count = samdb_result_uint(msg, "badPwdCount", 0); + + domain_dn = samdb_result_dn(sam_ctx, mem_ctx, msg_domain_ref, "nCName", NULL); + + server_info->acct_flags = samdb_result_acct_flags(sam_ctx, mem_ctx, + msg, domain_dn); + + server_info->user_session_key = user_sess_key; + server_info->lm_session_key = lm_sess_key; + + server_info->authenticated = true; + + *_server_info = server_info; + + return NT_STATUS_OK; +} + +NTSTATUS sam_get_results_principal(struct ldb_context *sam_ctx, + TALLOC_CTX *mem_ctx, const char *principal, + struct ldb_message ***msgs, + struct ldb_message ***msgs_domain_ref) +{ + struct ldb_dn *user_dn, *domain_dn; + NTSTATUS nt_status; + TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx); + int ret; + struct ldb_dn *partitions_basedn = samdb_partitions_dn(sam_ctx, mem_ctx); + + if (!tmp_ctx) { + return NT_STATUS_NO_MEMORY; + } + + nt_status = crack_user_principal_name(sam_ctx, tmp_ctx, principal, &user_dn, &domain_dn); + if (!NT_STATUS_IS_OK(nt_status)) { + talloc_free(tmp_ctx); + return nt_status; + } + + /* grab domain info from the reference */ + ret = gendb_search(sam_ctx, tmp_ctx, partitions_basedn, msgs_domain_ref, domain_ref_attrs, + "(ncName=%s)", ldb_dn_get_linearized(domain_dn)); + + if (ret != 1) { + talloc_free(tmp_ctx); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + + /* pull the user attributes */ + ret = gendb_search_dn(sam_ctx, tmp_ctx, user_dn, msgs, user_attrs); + if (ret != 1) { + talloc_free(tmp_ctx); + return NT_STATUS_INTERNAL_DB_CORRUPTION; + } + talloc_steal(mem_ctx, *msgs); + talloc_steal(mem_ctx, *msgs_domain_ref); + talloc_free(tmp_ctx); + + return NT_STATUS_OK; +} + +/* Used in the gensec_gssapi and gensec_krb5 server-side code, where the PAC isn't available */ +NTSTATUS sam_get_server_info_principal(TALLOC_CTX *mem_ctx, + struct event_context *event_ctx, + struct loadparm_context *lp_ctx, + const char *principal, + struct auth_serversupplied_info **server_info) +{ + NTSTATUS nt_status; + DATA_BLOB user_sess_key = data_blob(NULL, 0); + DATA_BLOB lm_sess_key = data_blob(NULL, 0); + + struct ldb_message **msgs; + struct ldb_message **msgs_domain_ref; + struct ldb_context *sam_ctx; + + TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx); + if (!tmp_ctx) { + return NT_STATUS_NO_MEMORY; + } + + sam_ctx = samdb_connect(tmp_ctx, event_ctx, lp_ctx, system_session(tmp_ctx, lp_ctx)); + if (sam_ctx == NULL) { + talloc_free(tmp_ctx); + return NT_STATUS_INVALID_SYSTEM_SERVICE; + } + + nt_status = sam_get_results_principal(sam_ctx, tmp_ctx, principal, + &msgs, &msgs_domain_ref); + if (!NT_STATUS_IS_OK(nt_status)) { + return nt_status; + } + + nt_status = authsam_make_server_info(tmp_ctx, sam_ctx, lp_netbios_name(lp_ctx), + msgs[0], msgs_domain_ref[0], + user_sess_key, lm_sess_key, + server_info); + if (NT_STATUS_IS_OK(nt_status)) { + talloc_steal(mem_ctx, *server_info); + } + talloc_free(tmp_ctx); + return nt_status; +} |