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samba-mirror/nsswitch/pam_winbind.c
Christof Schmitt fd364b01e2 pam_winbind: Fix CID 242274 Time of check time of use 
Always issue the mkdir call to avoid the TOCTOU issue. Only if there is
already an object with the requested name, check whether it is a
directory.

Signed-off-by: Christof Schmitt <cs@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
2020-07-17 17:12:33 +00:00

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/* pam_winbind module
Copyright Andrew Tridgell <tridge@samba.org> 2000
Copyright Tim Potter <tpot@samba.org> 2000
Copyright Andrew Bartlett <abartlet@samba.org> 2002
Copyright Guenther Deschner <gd@samba.org> 2005-2008
largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
contains large slabs of code from pam_unix by Elliot Lee
<sopwith@redhat.com> (see copyright below for full details)
*/
#include "pam_winbind.h"
enum pam_winbind_request_type
{
PAM_WINBIND_AUTHENTICATE,
PAM_WINBIND_SETCRED,
PAM_WINBIND_ACCT_MGMT,
PAM_WINBIND_OPEN_SESSION,
PAM_WINBIND_CLOSE_SESSION,
PAM_WINBIND_CHAUTHTOK,
PAM_WINBIND_CLEANUP
};
static int wbc_error_to_pam_error(wbcErr status)
{
switch (status) {
case WBC_ERR_SUCCESS:
return PAM_SUCCESS;
case WBC_ERR_NOT_IMPLEMENTED:
return PAM_SERVICE_ERR;
case WBC_ERR_UNKNOWN_FAILURE:
break;
case WBC_ERR_NO_MEMORY:
return PAM_BUF_ERR;
case WBC_ERR_INVALID_SID:
case WBC_ERR_INVALID_PARAM:
break;
case WBC_ERR_WINBIND_NOT_AVAILABLE:
return PAM_AUTHINFO_UNAVAIL;
case WBC_ERR_DOMAIN_NOT_FOUND:
return PAM_AUTHINFO_UNAVAIL;
case WBC_ERR_INVALID_RESPONSE:
return PAM_BUF_ERR;
case WBC_ERR_NSS_ERROR:
return PAM_USER_UNKNOWN;
case WBC_ERR_AUTH_ERROR:
return PAM_AUTH_ERR;
case WBC_ERR_UNKNOWN_USER:
return PAM_USER_UNKNOWN;
case WBC_ERR_UNKNOWN_GROUP:
return PAM_USER_UNKNOWN;
case WBC_ERR_PWD_CHANGE_FAILED:
break;
}
/* be paranoid */
return PAM_AUTH_ERR;
}
static const char *_pam_error_code_str(int err)
{
switch (err) {
case PAM_SUCCESS:
return "PAM_SUCCESS";
case PAM_OPEN_ERR:
return "PAM_OPEN_ERR";
case PAM_SYMBOL_ERR:
return "PAM_SYMBOL_ERR";
case PAM_SERVICE_ERR:
return "PAM_SERVICE_ERR";
case PAM_SYSTEM_ERR:
return "PAM_SYSTEM_ERR";
case PAM_BUF_ERR:
return "PAM_BUF_ERR";
case PAM_PERM_DENIED:
return "PAM_PERM_DENIED";
case PAM_AUTH_ERR:
return "PAM_AUTH_ERR";
case PAM_CRED_INSUFFICIENT:
return "PAM_CRED_INSUFFICIENT";
case PAM_AUTHINFO_UNAVAIL:
return "PAM_AUTHINFO_UNAVAIL";
case PAM_USER_UNKNOWN:
return "PAM_USER_UNKNOWN";
case PAM_MAXTRIES:
return "PAM_MAXTRIES";
case PAM_NEW_AUTHTOK_REQD:
return "PAM_NEW_AUTHTOK_REQD";
case PAM_ACCT_EXPIRED:
return "PAM_ACCT_EXPIRED";
case PAM_SESSION_ERR:
return "PAM_SESSION_ERR";
case PAM_CRED_UNAVAIL:
return "PAM_CRED_UNAVAIL";
case PAM_CRED_EXPIRED:
return "PAM_CRED_EXPIRED";
case PAM_CRED_ERR:
return "PAM_CRED_ERR";
case PAM_NO_MODULE_DATA:
return "PAM_NO_MODULE_DATA";
case PAM_CONV_ERR:
return "PAM_CONV_ERR";
case PAM_AUTHTOK_ERR:
return "PAM_AUTHTOK_ERR";
case PAM_AUTHTOK_RECOVER_ERR:
return "PAM_AUTHTOK_RECOVER_ERR";
case PAM_AUTHTOK_LOCK_BUSY:
return "PAM_AUTHTOK_LOCK_BUSY";
case PAM_AUTHTOK_DISABLE_AGING:
return "PAM_AUTHTOK_DISABLE_AGING";
case PAM_TRY_AGAIN:
return "PAM_TRY_AGAIN";
case PAM_IGNORE:
return "PAM_IGNORE";
case PAM_ABORT:
return "PAM_ABORT";
case PAM_AUTHTOK_EXPIRED:
return "PAM_AUTHTOK_EXPIRED";
#ifdef PAM_MODULE_UNKNOWN
case PAM_MODULE_UNKNOWN:
return "PAM_MODULE_UNKNOWN";
#endif
#ifdef PAM_BAD_ITEM
case PAM_BAD_ITEM:
return "PAM_BAD_ITEM";
#endif
#ifdef PAM_CONV_AGAIN
case PAM_CONV_AGAIN:
return "PAM_CONV_AGAIN";
#endif
#ifdef PAM_INCOMPLETE
case PAM_INCOMPLETE:
return "PAM_INCOMPLETE";
#endif
default:
return NULL;
}
}
#define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
do { \
_pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
_pam_log_state(ctx); \
} while (0)
#define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
do { \
_pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
function " returning %d (%s)", ctx ? ctx->pamh : NULL, retval, \
_pam_error_code_str(retval)); \
_pam_log_state(ctx); \
} while (0)
/* data tokens */
#define MAX_PASSWD_TRIES 3
#ifdef HAVE_GETTEXT
static char initialized = 0;
static inline void textdomain_init(void);
static inline void textdomain_init(void)
{
if (!initialized) {
bindtextdomain(MODULE_NAME, LOCALEDIR);
initialized = 1;
}
return;
}
#endif
/* some syslogging */
static void _pam_log_int(const pam_handle_t *pamh,
int err,
const char *format,
va_list args) PRINTF_ATTRIBUTE(3, 0);
#ifdef HAVE_PAM_VSYSLOG
static void _pam_log_int(const pam_handle_t *pamh,
int err,
const char *format,
va_list args)
{
pam_vsyslog(pamh, err, format, args);
}
#else
static void _pam_log_int(const pam_handle_t *pamh,
int err,
const char *format,
va_list args)
{
char *base = NULL;
va_list args2;
const char *service;
int ret;
va_copy(args2, args);
pam_get_item(pamh, PAM_SERVICE, (const void **) &service);
ret = vasprintf(&base, format, args);
if (ret == -1) {
/* what else todo ? */
vsyslog(err, format, args2);
va_end(args2);
return;
}
syslog(err, "%s(%s): %s", MODULE_NAME, service, base);
SAFE_FREE(base);
va_end(args2);
}
#endif /* HAVE_PAM_VSYSLOG */
static bool _pam_log_is_silent(int ctrl)
{
return on(ctrl, WINBIND_SILENT);
}
static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
{
va_list args;
if (_pam_log_is_silent(r->ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(r->pamh, err, format, args);
va_end(args);
}
static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
{
va_list args;
if (_pam_log_is_silent(ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(pamh, err, format, args);
va_end(args);
}
static bool _pam_log_is_debug_enabled(int ctrl)
{
if (ctrl == -1) {
return false;
}
if (_pam_log_is_silent(ctrl)) {
return false;
}
if (!(ctrl & WINBIND_DEBUG_ARG)) {
return false;
}
return true;
}
static bool _pam_log_is_debug_state_enabled(int ctrl)
{
if (!(ctrl & WINBIND_DEBUG_STATE)) {
return false;
}
return _pam_log_is_debug_enabled(ctrl);
}
static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
{
va_list args;
if (!r || !_pam_log_is_debug_enabled(r->ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(r->pamh, err, format, args);
va_end(args);
}
static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
{
va_list args;
if (!_pam_log_is_debug_enabled(ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(pamh, err, format, args);
va_end(args);
}
static void _pam_log_state_datum(struct pwb_context *ctx,
int item_type,
const char *key,
int is_string)
{
const void *data = NULL;
if (item_type != 0) {
pam_get_item(ctx->pamh, item_type, &data);
} else {
pam_get_data(ctx->pamh, key, &data);
}
if (data != NULL) {
const char *type = (item_type != 0) ? "ITEM" : "DATA";
if (is_string != 0) {
_pam_log_debug(ctx, LOG_DEBUG,
"[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
ctx->pamh, type, key, (const char *)data,
data);
} else {
_pam_log_debug(ctx, LOG_DEBUG,
"[pamh: %p] STATE: %s(%s) = %p",
ctx->pamh, type, key, data);
}
}
}
#define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
_pam_log_state_datum(ctx, 0, module_data_name, 0)
#define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
_pam_log_state_datum(ctx, 0, module_data_name, 1)
#define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, 0)
#define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, 1)
#ifdef DEBUG_PASSWORD
#define _LOG_PASSWORD_AS_STRING 1
#else
#define _LOG_PASSWORD_AS_STRING 0
#endif
#define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, \
_LOG_PASSWORD_AS_STRING)
/*
* wrapper to preserve old behaviour of iniparser which ignored
* key values that had no value assigned like
* key =
* for a key like above newer iniparser will return a zero-length
* string, previously iniparser would return NULL
*
* JRA: For compatibility, tiniparser behaves like iniparser.
*/
static const char *tiniparser_getstring_nonempty(struct tiniparser_dictionary *d,
const char *key,
const char *def)
{
const char *ret = tiniparser_getstring(d, key, def);
if (ret && strlen(ret) == 0) {
ret = NULL;
}
return ret;
}
static void _pam_log_state(struct pwb_context *ctx)
{
if (!ctx || !_pam_log_is_debug_state_enabled(ctx->ctrl)) {
return;
}
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
_PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
_PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
#ifdef PAM_FAIL_DELAY
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
#endif
#ifdef PAM_REPOSITORY
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
#endif
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
_PAM_LOG_STATE_DATA_STRING(ctx,
PAM_WINBIND_NEW_AUTHTOK_REQD);
/* Use atoi to get PAM result code */
_PAM_LOG_STATE_DATA_STRING(ctx,
PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
_PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
}
static int _pam_parse(const pam_handle_t *pamh,
int flags,
int argc,
const char **argv,
enum pam_winbind_request_type type,
struct tiniparser_dictionary **result_d)
{
int ctrl = 0;
const char *config_file = NULL;
int i;
const char **v;
struct tiniparser_dictionary *d = NULL;
if (flags & PAM_SILENT) {
ctrl |= WINBIND_SILENT;
}
for (i=argc,v=argv; i-- > 0; ++v) {
if (!strncasecmp(*v, "config", strlen("config"))) {
ctrl |= WINBIND_CONFIG_FILE;
config_file = v[i];
break;
}
}
if (config_file == NULL) {
config_file = PAM_WINBIND_CONFIG_FILE;
}
d = tiniparser_load(config_file);
if (d == NULL) {
goto config_from_pam;
}
if (tiniparser_getboolean(d, "global:debug", false)) {
ctrl |= WINBIND_DEBUG_ARG;
}
if (tiniparser_getboolean(d, "global:debug_state", false)) {
ctrl |= WINBIND_DEBUG_STATE;
}
if (tiniparser_getboolean(d, "global:cached_login", false)) {
ctrl |= WINBIND_CACHED_LOGIN;
}
if (tiniparser_getboolean(d, "global:krb5_auth", false)) {
ctrl |= WINBIND_KRB5_AUTH;
}
if (tiniparser_getboolean(d, "global:silent", false)) {
ctrl |= WINBIND_SILENT;
}
if (tiniparser_getstring_nonempty(d, "global:krb5_ccache_type", NULL) != NULL) {
ctrl |= WINBIND_KRB5_CCACHE_TYPE;
}
if ((tiniparser_getstring_nonempty(d, "global:require-membership-of", NULL)
!= NULL) ||
(tiniparser_getstring_nonempty(d, "global:require_membership_of", NULL)
!= NULL)) {
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
}
if (tiniparser_getboolean(d, "global:try_first_pass", false)) {
ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
}
if (tiniparser_getint(d, "global:warn_pwd_expire", 0)) {
ctrl |= WINBIND_WARN_PWD_EXPIRE;
}
if (tiniparser_getboolean(d, "global:mkhomedir", false)) {
ctrl |= WINBIND_MKHOMEDIR;
}
config_from_pam:
/* step through arguments */
for (i=argc,v=argv; i-- > 0; ++v) {
/* generic options */
if (!strcmp(*v,"debug"))
ctrl |= WINBIND_DEBUG_ARG;
else if (!strcasecmp(*v, "debug_state"))
ctrl |= WINBIND_DEBUG_STATE;
else if (!strcasecmp(*v, "silent"))
ctrl |= WINBIND_SILENT;
else if (!strcasecmp(*v, "use_authtok"))
ctrl |= WINBIND_USE_AUTHTOK_ARG;
else if (!strcasecmp(*v, "try_authtok"))
ctrl |= WINBIND_TRY_AUTHTOK_ARG;
else if (!strcasecmp(*v, "use_first_pass"))
ctrl |= WINBIND_USE_FIRST_PASS_ARG;
else if (!strcasecmp(*v, "try_first_pass"))
ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
else if (!strcasecmp(*v, "unknown_ok"))
ctrl |= WINBIND_UNKNOWN_OK_ARG;
else if ((type == PAM_WINBIND_AUTHENTICATE
|| type == PAM_WINBIND_SETCRED)
&& !strncasecmp(*v, "require_membership_of",
strlen("require_membership_of")))
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
else if ((type == PAM_WINBIND_AUTHENTICATE
|| type == PAM_WINBIND_SETCRED)
&& !strncasecmp(*v, "require-membership-of",
strlen("require-membership-of")))
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
else if (!strcasecmp(*v, "krb5_auth"))
ctrl |= WINBIND_KRB5_AUTH;
else if (!strncasecmp(*v, "krb5_ccache_type",
strlen("krb5_ccache_type")))
ctrl |= WINBIND_KRB5_CCACHE_TYPE;
else if (!strcasecmp(*v, "cached_login"))
ctrl |= WINBIND_CACHED_LOGIN;
else if (!strcasecmp(*v, "mkhomedir"))
ctrl |= WINBIND_MKHOMEDIR;
else if (!strncasecmp(*v, "warn_pwd_expire",
strlen("warn_pwd_expire")))
ctrl |= WINBIND_WARN_PWD_EXPIRE;
else if (type != PAM_WINBIND_CLEANUP) {
__pam_log(pamh, ctrl, LOG_ERR,
"pam_parse: unknown option: %s", *v);
return -1;
}
}
if (result_d) {
*result_d = d;
} else {
if (d) {
tiniparser_freedict(d);
}
}
return ctrl;
};
static int _pam_winbind_free_context(struct pwb_context *ctx)
{
if (!ctx) {
return 0;
}
if (ctx->dict) {
tiniparser_freedict(ctx->dict);
}
wbcCtxFree(ctx->wbc_ctx);
return 0;
}
static int _pam_winbind_init_context(pam_handle_t *pamh,
int flags,
int argc,
const char **argv,
enum pam_winbind_request_type type,
struct pwb_context **ctx_p)
{
struct pwb_context *r = NULL;
const char *service = NULL;
char service_name[32] = {0};
int ctrl_code;
#ifdef HAVE_GETTEXT
textdomain_init();
#endif
r = talloc_zero(NULL, struct pwb_context);
if (!r) {
return PAM_BUF_ERR;
}
talloc_set_destructor(r, _pam_winbind_free_context);
r->pamh = pamh;
r->flags = flags;
r->argc = argc;
r->argv = argv;
ctrl_code = _pam_parse(pamh, flags, argc, argv, type, &r->dict);
if (ctrl_code == -1) {
TALLOC_FREE(r);
return PAM_SYSTEM_ERR;
}
r->ctrl = ctrl_code;
r->wbc_ctx = wbcCtxCreate();
if (r->wbc_ctx == NULL) {
TALLOC_FREE(r);
return PAM_SYSTEM_ERR;
}
pam_get_item(pamh, PAM_SERVICE, (const void **)&service);
snprintf(service_name, sizeof(service_name), "PAM_WINBIND[%s]", service);
wbcSetClientProcessName(service_name);
*ctx_p = r;
return PAM_SUCCESS;
}
static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
void *data,
int error_status)
{
int ctrl = _pam_parse(pamh, 0, 0, NULL, PAM_WINBIND_CLEANUP, NULL);
if (_pam_log_is_debug_state_enabled(ctrl)) {
__pam_log_debug(pamh, ctrl, LOG_DEBUG,
"[pamh: %p] CLEAN: cleaning up PAM data %p "
"(error_status = %d)", pamh, data,
error_status);
}
TALLOC_FREE(data);
}
static const struct ntstatus_errors {
const char *ntstatus_string;
const char *error_string;
} ntstatus_errors[] = {
{"NT_STATUS_OK",
N_("Success")},
{"NT_STATUS_BACKUP_CONTROLLER",
N_("No primary Domain Controller available")},
{"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
N_("No domain controllers found")},
{"NT_STATUS_NO_LOGON_SERVERS",
N_("No logon servers")},
{"NT_STATUS_PWD_TOO_SHORT",
N_("Password too short")},
{"NT_STATUS_PWD_TOO_RECENT",
N_("The password of this user is too recent to change")},
{"NT_STATUS_PWD_HISTORY_CONFLICT",
N_("Password is already in password history")},
{"NT_STATUS_PASSWORD_EXPIRED",
N_("Your password has expired")},
{"NT_STATUS_PASSWORD_MUST_CHANGE",
N_("You need to change your password now")},
{"NT_STATUS_INVALID_WORKSTATION",
N_("You are not allowed to logon from this workstation")},
{"NT_STATUS_INVALID_LOGON_HOURS",
N_("You are not allowed to logon at this time")},
{"NT_STATUS_ACCOUNT_EXPIRED",
N_("Your account has expired. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_ACCOUNT_DISABLED",
N_("Your account is disabled. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_ACCOUNT_LOCKED_OUT",
N_("Your account has been locked. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_ACCESS_DENIED",
N_("Access is denied")},
{NULL, NULL}
};
static const char *_get_ntstatus_error_string(const char *nt_status_string)
{
int i;
for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
nt_status_string)) {
return _(ntstatus_errors[i].error_string);
}
}
return NULL;
}
/* --- authentication management functions --- */
/* Attempt a conversation */
static int converse(const pam_handle_t *pamh,
int nargs,
const struct pam_message **message,
struct pam_response **response)
{
int retval;
const struct pam_conv *conv;
retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
if (retval == PAM_SUCCESS) {
retval = conv->conv(nargs,
discard_const_p(const struct pam_message *, message),
response, conv->appdata_ptr);
}
return retval; /* propagate error status */
}
static int _make_remark(struct pwb_context *ctx,
int type,
const char *text)
{
int retval = PAM_SUCCESS;
const struct pam_message *pmsg[1];
struct pam_message msg[1];
struct pam_response *resp;
if (ctx->flags & WINBIND_SILENT) {
return PAM_SUCCESS;
}
pmsg[0] = &msg[0];
msg[0].msg = discard_const_p(char, text);
msg[0].msg_style = type;
resp = NULL;
retval = converse(ctx->pamh, 1, pmsg, &resp);
if (resp) {
_pam_drop_reply(resp, 1);
}
return retval;
}
static int _make_remark_v(struct pwb_context *ctx,
int type,
const char *format,
va_list args) PRINTF_ATTRIBUTE(3, 0);
static int _make_remark_v(struct pwb_context *ctx,
int type,
const char *format,
va_list args)
{
char *var;
int ret;
ret = vasprintf(&var, format, args);
if (ret < 0) {
_pam_log(ctx, LOG_ERR, "memory allocation failure");
return ret;
}
ret = _make_remark(ctx, type, var);
SAFE_FREE(var);
return ret;
}
static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
{
int ret;
va_list args;
va_start(args, format);
ret = _make_remark_v(ctx, type, format, args);
va_end(args);
return ret;
}
static int pam_winbind_request_log(struct pwb_context *ctx,
int retval,
const char *user,
const char *fn)
{
switch (retval) {
case PAM_AUTH_ERR:
/* incorrect password */
_pam_log(ctx, LOG_WARNING, "user '%s' denied access "
"(incorrect password or invalid membership)", user);
return retval;
case PAM_ACCT_EXPIRED:
/* account expired */
_pam_log(ctx, LOG_WARNING, "user '%s' account expired",
user);
return retval;
case PAM_AUTHTOK_EXPIRED:
/* password expired */
_pam_log(ctx, LOG_WARNING, "user '%s' password expired",
user);
return retval;
case PAM_NEW_AUTHTOK_REQD:
/* new password required */
_pam_log(ctx, LOG_WARNING, "user '%s' new password "
"required", user);
return retval;
case PAM_USER_UNKNOWN:
/* the user does not exist */
_pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
user);
if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
return PAM_IGNORE;
}
return retval;
case PAM_AUTHTOK_ERR:
/* Authentication token manipulation error */
_pam_log(ctx, LOG_WARNING, "user `%s' authentication token change failed "
"(pwd complexity/history/min_age not met?)", user);
return retval;
case PAM_SUCCESS:
/* Otherwise, the authentication looked good */
if (strcmp(fn, "wbcLogonUser") == 0) {
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", user);
} else {
_pam_log(ctx, LOG_NOTICE,
"user '%s' OK", user);
}
return retval;
default:
/* we don't know anything about this return value */
_pam_log(ctx, LOG_ERR,
"internal module error (retval = %s(%d), user = '%s')",
_pam_error_code_str(retval), retval, user);
return retval;
}
}
static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
struct wbcAuthErrorInfo *e,
wbcErr status,
const char *username,
const char *fn)
{
int ret = PAM_AUTH_ERR;
if (WBC_ERROR_IS_OK(status)) {
_pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
fn);
ret = PAM_SUCCESS;
return pam_winbind_request_log(ctx, ret, username, fn);
}
if (e) {
if (e->pam_error != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"request %s failed: %s, "
"PAM error: %s (%d), NTSTATUS: %s, "
"Error message was: %s",
fn,
wbcErrorString(status),
_pam_error_code_str(e->pam_error),
e->pam_error,
e->nt_string,
e->display_string);
ret = e->pam_error;
return pam_winbind_request_log(ctx, ret, username, fn);
}
_pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
ret = PAM_SERVICE_ERR;
return pam_winbind_request_log(ctx, ret, username, fn);
}
ret = wbc_error_to_pam_error(status);
_pam_log(ctx, LOG_ERR,
"request %s failed: %s, PAM error: %s (%d)!",
fn, wbcErrorString(status),
_pam_error_code_str(ret), ret);
return pam_winbind_request_log(ctx, ret, username, fn);
}
#if defined(HAVE_PAM_RADIO_TYPE)
static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
{
struct pam_message msg;
const struct pam_message *pmsg;
struct pam_response *resp = NULL;
int ret;
bool retval = false;
pmsg = &msg;
msg.msg_style = PAM_RADIO_TYPE;
msg.msg = _("Do you want to change your password now?");
ret = converse(ctx->pamh, 1, &pmsg, &resp);
if (resp == NULL) {
if (ret == PAM_SUCCESS) {
_pam_log(ctx, LOG_CRIT, "pam_winbind: system error!\n");
return false;
}
}
if (ret != PAM_SUCCESS) {
return false;
}
_pam_log(ctx, LOG_CRIT, "Received [%s] reply from application.\n", resp->resp);
if ((resp->resp != NULL) && (strcasecmp(resp->resp, "yes") == 0)) {
retval = true;
}
_pam_drop_reply(resp, 1);
return retval;
}
#else
static bool _pam_winbind_change_pwd(struct pwb_context *ctx)
{
return false;
}
#endif
/**
* send a password expiry message if required
*
* @param ctx PAM winbind context.
* @param next_change expected (calculated) next expiry date.
* @param already_expired pointer to a boolean to indicate if the password is
* already expired.
*
* @return boolean Returns true if message has been sent, false if not.
*/
static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
time_t next_change,
time_t now,
int warn_pwd_expire,
bool *already_expired,
bool *change_pwd)
{
int days = 0;
struct tm tm_now, tm_next_change;
bool retval = false;
int ret;
if (already_expired) {
*already_expired = false;
}
if (change_pwd) {
*change_pwd = false;
}
if (next_change <= now) {
PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
if (already_expired) {
*already_expired = true;
}
return true;
}
if ((next_change < 0) ||
(next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
return false;
}
if ((localtime_r(&now, &tm_now) == NULL) ||
(localtime_r(&next_change, &tm_next_change) == NULL)) {
return false;
}
days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
(tm_now.tm_yday+tm_now.tm_year*365);
if (days == 0) {
ret = _make_remark(ctx, PAM_TEXT_INFO,
_("Your password expires today.\n"));
/*
* If change_pwd and already_expired is null.
* We are just sending a notification message.
* We don't expect any response in this case.
*/
if (!change_pwd && !already_expired) {
return true;
}
/*
* successfully sent the warning message.
* Give the user a chance to change pwd.
*/
if (ret == PAM_SUCCESS) {
if (change_pwd) {
retval = _pam_winbind_change_pwd(ctx);
if (retval) {
*change_pwd = true;
}
}
}
return true;
}
if (days > 0 && days < warn_pwd_expire) {
ret = _make_remark_format(ctx, PAM_TEXT_INFO,
_("Your password will expire in %d %s.\n"),
days, (days > 1) ? _("days"):_("day"));
/*
* If change_pwd and already_expired is null.
* We are just sending a notification message.
* We don't expect any response in this case.
*/
if (!change_pwd && !already_expired) {
return true;
}
/*
* successfully sent the warning message.
* Give the user a chance to change pwd.
*/
if (ret == PAM_SUCCESS) {
if (change_pwd) {
retval = _pam_winbind_change_pwd(ctx);
if (retval) {
*change_pwd = true;
}
}
}
return true;
}
return false;
}
/**
* Send a warning if the password expires in the near future
*
* @param ctx PAM winbind context.
* @param response The full authentication response structure.
* @param already_expired boolean, is the pwd already expired?
*
* @return void.
*/
static void _pam_warn_password_expiry(struct pwb_context *ctx,
const struct wbcAuthUserInfo *info,
int warn_pwd_expire,
bool *already_expired,
bool *change_pwd)
{
time_t now = time(NULL);
time_t next_change = 0;
if (info == NULL) {
return;
}
if (already_expired) {
*already_expired = false;
}
if (change_pwd) {
*change_pwd = false;
}
/* accounts with WBC_ACB_PWNOEXP set never receive a warning */
if (info->acct_flags & WBC_ACB_PWNOEXP) {
return;
}
/* no point in sending a warning if this is a grace logon */
if (PAM_WB_GRACE_LOGON(info->user_flags)) {
return;
}
/* check if the info3 must change timestamp has been set */
next_change = info->pass_must_change_time;
if (_pam_send_password_expiry_message(ctx, next_change, now,
warn_pwd_expire,
already_expired,
change_pwd)) {
return;
}
/* no warning sent */
}
#define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
/**
* Append a string, making sure not to overflow and to always return a
* NULL-terminated string.
*
* @param dest Destination string buffer (must already be NULL-terminated).
* @param src Source string buffer.
* @param dest_buffer_size Size of dest buffer in bytes.
*
* @return false if dest buffer is not big enough (no bytes copied), true on
* success.
*/
static bool safe_append_string(char *dest,
const char *src,
int dest_buffer_size)
{
size_t len;
len = strlcat(dest, src, dest_buffer_size);
return (len < dest_buffer_size);
}
/**
* Convert a names into a SID string, appending it to a buffer.
*
* @param ctx PAM winbind context.
* @param user User in PAM request.
* @param name Name to convert.
* @param sid_list_buffer Where to append the string sid.
* @param sid_list_buffer Size of sid_list_buffer (in bytes).
*
* @return false on failure, true on success.
*/
static bool winbind_name_to_sid_string(struct pwb_context *ctx,
const char *user,
const char *name,
char *sid_list_buffer,
int sid_list_buffer_size)
{
char sid_string[WBC_SID_STRING_BUFLEN];
/* lookup name? */
if (IS_SID_STRING(name)) {
strlcpy(sid_string, name, sizeof(sid_string));
} else {
wbcErr wbc_status;
struct wbcDomainSid sid;
enum wbcSidType type;
_pam_log_debug(ctx, LOG_DEBUG,
"no sid given, looking up: %s\n", name);
wbc_status = wbcCtxLookupName(ctx->wbc_ctx,
"",
name,
&sid,
&type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_INFO,
"could not lookup name: %s\n", name);
return false;
}
wbcSidToStringBuf(&sid, sid_string, sizeof(sid_string));
}
if (!safe_append_string(sid_list_buffer, sid_string,
sid_list_buffer_size)) {
return false;
}
return true;
}
/**
* Convert a list of names into a list of sids.
*
* @param ctx PAM winbind context.
* @param user User in PAM request.
* @param name_list List of names or string sids, separated by commas.
* @param sid_list_buffer Where to put the list of string sids.
* @param sid_list_buffer Size of sid_list_buffer (in bytes).
*
* @return false on failure, true on success.
*/
static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
const char *user,
const char *name_list,
char *sid_list_buffer,
int sid_list_buffer_size)
{
bool result = false;
char *current_name = NULL;
const char *search_location;
const char *comma;
int len;
if (sid_list_buffer_size > 0) {
sid_list_buffer[0] = 0;
}
search_location = name_list;
while ((comma = strchr(search_location, ',')) != NULL) {
current_name = strndup(search_location,
comma - search_location);
if (NULL == current_name) {
goto out;
}
if (!winbind_name_to_sid_string(ctx, user,
current_name,
sid_list_buffer,
sid_list_buffer_size)) {
/*
* If one group name failed, we must not fail
* the authentication totally, continue with
* the following group names. If user belongs to
* one of the valid groups, we must allow it
* login. -- BoYang
*/
_pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
"check if group %s is valid group.", current_name,
current_name);
_make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
"to sid, please contact your administrator to see "
"if group %s is valid."), current_name, current_name);
SAFE_FREE(current_name);
search_location = comma + 1;
continue;
}
SAFE_FREE(current_name);
if (!safe_append_string(sid_list_buffer, ",",
sid_list_buffer_size)) {
goto out;
}
search_location = comma + 1;
}
if (!winbind_name_to_sid_string(ctx, user, search_location,
sid_list_buffer,
sid_list_buffer_size)) {
_pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
"check if group %s is valid group.", search_location,
search_location);
_make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
"to sid, please contact your administrator to see "
"if group %s is valid."), search_location, search_location);
/* If no valid groups were converted we should fail outright */
if (name_list != NULL && strlen(sid_list_buffer) == 0) {
result = false;
goto out;
}
/*
* The lookup of the last name failed..
* It results in require_member_of_sid ends with ','
* It is malformatted parameter here, overwrite the last ','.
*/
len = strlen(sid_list_buffer);
if ((len != 0) && (sid_list_buffer[len - 1] == ',')) {
sid_list_buffer[len - 1] = '\0';
}
}
result = true;
out:
SAFE_FREE(current_name);
return result;
}
/**
* put krb5ccname variable into environment
*
* @param ctx PAM winbind context.
* @param krb5ccname env variable retrieved from winbindd.
*
* @return void.
*/
static void _pam_setup_krb5_env(struct pwb_context *ctx,
struct wbcLogonUserInfo *info)
{
char *var = NULL;
int ret;
uint32_t i;
const char *krb5ccname = NULL;
if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
return;
}
if (!info) {
return;
}
for (i=0; i < info->num_blobs; i++) {
if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
krb5ccname = (const char *)info->blobs[i].blob.data;
break;
}
}
if (!krb5ccname || (strlen(krb5ccname) == 0)) {
return;
}
_pam_log_debug(ctx, LOG_DEBUG,
"request returned KRB5CCNAME: %s", krb5ccname);
if (asprintf(&var, "KRB5CCNAME=%s", krb5ccname) == -1) {
return;
}
ret = pam_putenv(ctx->pamh, var);
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"failed to set KRB5CCNAME to %s: %s",
var, pam_strerror(ctx->pamh, ret));
}
free(var);
}
/**
* Copy unix username if available (further processed in PAM).
*
* @param ctx PAM winbind context
* @param user_ret A pointer that holds a pointer to a string
* @param unix_username A username
*
* @return void.
*/
static void _pam_setup_unix_username(struct pwb_context *ctx,
char **user_ret,
struct wbcLogonUserInfo *info)
{
const char *unix_username = NULL;
uint32_t i;
if (!user_ret || !info) {
return;
}
for (i=0; i < info->num_blobs; i++) {
if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
unix_username = (const char *)info->blobs[i].blob.data;
break;
}
}
if (!unix_username || !unix_username[0]) {
return;
}
*user_ret = strdup(unix_username);
}
/**
* Set string into the PAM stack.
*
* @param ctx PAM winbind context.
* @param data_name Key name for pam_set_data.
* @param value String value.
*
* @return void.
*/
static void _pam_set_data_string(struct pwb_context *ctx,
const char *data_name,
const char *value)
{
int ret;
if (!data_name || !value || (strlen(data_name) == 0) ||
(strlen(value) == 0)) {
return;
}
ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
_pam_winbind_cleanup_func);
if (ret != PAM_SUCCESS) {
_pam_log_debug(ctx, LOG_DEBUG,
"Could not set data %s: %s\n",
data_name, pam_strerror(ctx->pamh, ret));
}
}
/**
* Set info3 strings into the PAM stack.
*
* @param ctx PAM winbind context.
* @param data_name Key name for pam_set_data.
* @param value String value.
*
* @return void.
*/
static void _pam_set_data_info3(struct pwb_context *ctx,
const struct wbcAuthUserInfo *info)
{
if (info != NULL) {
_pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
info->home_directory);
_pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
info->logon_script);
_pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
info->logon_server);
_pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
info->profile_path);
}
}
/**
* Free info3 strings in the PAM stack.
*
* @param pamh PAM handle
*
* @return void.
*/
static void _pam_free_data_info3(pam_handle_t *pamh)
{
pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
}
/**
* Send PAM_ERROR_MSG for cached or grace logons.
*
* @param ctx PAM winbind context.
* @param username User in PAM request.
* @param info3_user_flgs Info3 flags containing logon type bits.
*
* @return void.
*/
static void _pam_warn_logon_type(struct pwb_context *ctx,
const char *username,
uint32_t info3_user_flgs)
{
/* inform about logon type */
if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Grace login. "
"Please change your password as soon you're "
"online again"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s logged on using grace logon\n",
username);
} else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Domain Controller unreachable, "
"using cached credentials instead. "
"Network resources may be unavailable"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s logged on using cached credentials\n",
username);
}
}
/**
* Send PAM_ERROR_MSG for krb5 errors.
*
* @param ctx PAM winbind context.
* @param username User in PAM request.
* @param info3_user_flgs Info3 flags containing logon type bits.
*
* @return void.
*/
static void _pam_warn_krb5_failure(struct pwb_context *ctx,
const char *username,
uint32_t info3_user_flgs)
{
if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Failed to establish your Kerberos Ticket cache "
"due time differences\n"
"with the domain controller. "
"Please verify the system time.\n"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s: Clock skew when getting Krb5 TGT\n",
username);
}
}
static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
const struct wbcAuthErrorInfo *e,
const char *nt_status_string,
int *pam_err)
{
const char *ntstatus = NULL;
const char *error_string = NULL;
if (!e || !pam_err) {
return false;
}
ntstatus = e->nt_string;
if (!ntstatus) {
return false;
}
if (strcasecmp(ntstatus, nt_status_string) == 0) {
error_string = _get_ntstatus_error_string(nt_status_string);
if (error_string) {
_make_remark(ctx, PAM_ERROR_MSG, error_string);
*pam_err = e->pam_error;
return true;
}
if (e->display_string) {
_make_remark(ctx, PAM_ERROR_MSG, _(e->display_string));
*pam_err = e->pam_error;
return true;
}
_make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
*pam_err = e->pam_error;
return true;
}
return false;
};
/**
* Compose Password Restriction String for a PAM_ERROR_MSG conversation.
*
* @param i The wbcUserPasswordPolicyInfo struct.
*
* @return string (caller needs to talloc_free).
*/
static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
struct wbcUserPasswordPolicyInfo *i)
{
char *str = NULL;
if (!i) {
goto failed;
}
str = talloc_asprintf(ctx, _("Your password "));
if (!str) {
goto failed;
}
if (i->min_length_password > 0) {
str = talloc_asprintf_append(str,
_("must be at least %d characters; "),
i->min_length_password);
if (!str) {
goto failed;
}
}
if (i->password_history > 0) {
str = talloc_asprintf_append(str,
_("cannot repeat any of your previous %d "
"passwords; "),
i->password_history);
if (!str) {
goto failed;
}
}
if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
str = talloc_asprintf_append(str,
_("must contain capitals, numerals "
"or punctuation; "
"and cannot contain your account "
"or full name; "));
if (!str) {
goto failed;
}
}
str = talloc_asprintf_append(str,
_("Please type a different password. "
"Type a password which meets these requirements in "
"both text boxes."));
if (!str) {
goto failed;
}
return str;
failed:
TALLOC_FREE(str);
return NULL;
}
static int _pam_create_homedir(struct pwb_context *ctx,
const char *dirname,
mode_t mode)
{
int ret;
ret = mkdir(dirname, mode);
if (ret != 0 && errno == EEXIST) {
struct stat sbuf;
ret = stat(dirname, &sbuf);
if (ret != 0) {
return PAM_PERM_DENIED;
}
if (!S_ISDIR(sbuf.st_mode)) {
return PAM_PERM_DENIED;
}
}
if (ret != 0) {
_make_remark_format(ctx, PAM_TEXT_INFO,
_("Creating directory: %s failed: %s"),
dirname, strerror(errno));
_pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
dirname, strerror(errno));
return PAM_PERM_DENIED;
}
return PAM_SUCCESS;
}
static int _pam_chown_homedir(struct pwb_context *ctx,
const char *dirname,
uid_t uid,
gid_t gid)
{
if (chown(dirname, uid, gid) != 0) {
_pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
dirname, strerror(errno));
return PAM_PERM_DENIED;
}
return PAM_SUCCESS;
}
static int _pam_mkhomedir(struct pwb_context *ctx)
{
struct passwd *pwd = NULL;
char *token = NULL;
char *create_dir = NULL;
char *user_dir = NULL;
int ret;
const char *username;
mode_t mode = 0700;
char *safe_ptr = NULL;
char *p = NULL;
/* Get the username */
ret = pam_get_user(ctx->pamh, &username, NULL);
if ((ret != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
return PAM_SERVICE_ERR;
}
pwd = getpwnam(username);
if (pwd == NULL) {
_pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
return PAM_USER_UNKNOWN;
}
_pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
if (ret == PAM_SUCCESS) {
ret = _pam_chown_homedir(ctx, pwd->pw_dir,
pwd->pw_uid,
pwd->pw_gid);
}
if (ret == PAM_SUCCESS) {
return ret;
}
/* maybe we need to create parent dirs */
create_dir = talloc_strdup(ctx, "/");
if (!create_dir) {
return PAM_BUF_ERR;
}
/* find final directory */
user_dir = strrchr(pwd->pw_dir, '/');
if (!user_dir) {
return PAM_BUF_ERR;
}
user_dir++;
_pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
p = pwd->pw_dir;
while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
mode = 0755;
p = NULL;
_pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
create_dir = talloc_asprintf_append(create_dir, "%s/", token);
if (!create_dir) {
return PAM_BUF_ERR;
}
_pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
if (strcmp(token, user_dir) == 0) {
_pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
mode = 0700;
}
ret = _pam_create_homedir(ctx, create_dir, mode);
if (ret != PAM_SUCCESS) {
return ret;
}
}
return _pam_chown_homedir(ctx, create_dir,
pwd->pw_uid,
pwd->pw_gid);
}
/* talk to winbindd */
static int winbind_auth_request(struct pwb_context *ctx,
const char *user,
const char *pass,
const char *member,
const char *cctype,
const int warn_pwd_expire,
struct wbcAuthErrorInfo **p_error,
struct wbcLogonUserInfo **p_info,
time_t *pwd_last_set,
char **user_ret)
{
wbcErr wbc_status;
struct wbcLogonUserParams logon;
char membership_of[1024];
uid_t user_uid = -1;
uint32_t flags = WBFLAG_PAM_INFO3_TEXT;
struct wbcLogonUserInfo *info = NULL;
struct wbcAuthUserInfo *user_info = NULL;
struct wbcAuthErrorInfo *error = NULL;
int ret = PAM_AUTH_ERR;
int i;
const char *codes[] = {
"NT_STATUS_PASSWORD_EXPIRED",
"NT_STATUS_PASSWORD_MUST_CHANGE",
"NT_STATUS_INVALID_WORKSTATION",
"NT_STATUS_INVALID_LOGON_HOURS",
"NT_STATUS_ACCOUNT_EXPIRED",
"NT_STATUS_ACCOUNT_DISABLED",
"NT_STATUS_ACCOUNT_LOCKED_OUT",
"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_WRONG_PASSWORD",
"NT_STATUS_ACCESS_DENIED"
};
if (pwd_last_set) {
*pwd_last_set = 0;
}
/* Krb5 auth always has to go against the KDC of the user's realm */
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
}
if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
struct passwd *pwd = NULL;
pwd = getpwnam(user);
if (pwd == NULL) {
return PAM_USER_UNKNOWN;
}
user_uid = pwd->pw_uid;
}
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling krb5 login flag\n");
flags |= WBFLAG_PAM_KRB5 |
WBFLAG_PAM_FALLBACK_AFTER_KRB5;
}
if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling cached login flag\n");
flags |= WBFLAG_PAM_CACHED_LOGIN;
}
if (user_ret) {
*user_ret = NULL;
flags |= WBFLAG_PAM_UNIX_NAME;
}
if (cctype != NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling request for a %s krb5 ccache\n",
cctype);
}
if (member != NULL) {
ZERO_STRUCT(membership_of);
if (!winbind_name_list_to_sid_string_list(ctx, user, member,
membership_of,
sizeof(membership_of))) {
_pam_log_debug(ctx, LOG_ERR,
"failed to serialize membership of sid "
"\"%s\"\n", member);
return PAM_AUTH_ERR;
}
}
ZERO_STRUCT(logon);
logon.username = user;
logon.password = pass;
if (cctype) {
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"krb5_cc_type",
0,
discard_const_p(uint8_t, cctype),
strlen(cctype)+1);
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
}
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"flags",
0,
(uint8_t *)&flags,
sizeof(flags));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"user_uid",
0,
(uint8_t *)&user_uid,
sizeof(user_uid));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
if (member) {
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"membership_of",
0,
(uint8_t *)membership_of,
sizeof(membership_of));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
}
wbc_status = wbcCtxLogonUser(ctx->wbc_ctx,
&logon,
&info,
&error,
NULL);
ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogonUser");
wbcFreeMemory(logon.blobs);
logon.blobs = NULL;
if (info && info->info) {
user_info = info->info;
}
if (pwd_last_set && user_info) {
*pwd_last_set = user_info->pass_last_set_time;
}
if (p_info && info) {
*p_info = info;
}
if (p_error && error) {
/* We want to process the error in the caller. */
*p_error = error;
return ret;
}
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret = ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
ret = _ret;
goto done;
}
}
if ((ret == PAM_SUCCESS) && user_info && info) {
bool already_expired = false;
bool change_pwd = false;
/* warn a user if the password is about to expire soon */
_pam_warn_password_expiry(ctx, user_info,
warn_pwd_expire,
&already_expired,
&change_pwd);
if (already_expired == true) {
SMB_TIME_T last_set = user_info->pass_last_set_time;
SMB_TIME_T must_set = user_info->pass_must_change_time;
_pam_log_debug(ctx, LOG_DEBUG,
"Password has expired "
"(Password was last set: %lld, "
"it must be changed here "
"%lld (now it's: %ld))\n",
(long long int)last_set,
(long long int)must_set,
(long)time(NULL));
return PAM_AUTHTOK_EXPIRED;
}
if (change_pwd) {
ret = PAM_NEW_AUTHTOK_REQD;
goto done;
}
/* inform about logon type */
_pam_warn_logon_type(ctx, user, user_info->user_flags);
/* inform about krb5 failures */
_pam_warn_krb5_failure(ctx, user, user_info->user_flags);
/* set some info3 info for other modules in the stack */
_pam_set_data_info3(ctx, user_info);
/* put krb5ccname into env */
_pam_setup_krb5_env(ctx, info);
/* If winbindd returned a username, return the pointer to it
* here. */
_pam_setup_unix_username(ctx, user_ret, info);
}
done:
wbcFreeMemory(logon.blobs);
if (info && info->blobs && !p_info) {
wbcFreeMemory(info->blobs);
/*
* We set blobs to NULL to prevent a use after free in the
* in the wbcLogonUserInfoDestructor
*/
info->blobs = NULL;
}
if (error && !p_error) {
wbcFreeMemory(error);
}
if (info && !p_info) {
wbcFreeMemory(info);
}
return ret;
}
/* talk to winbindd */
static int winbind_chauthtok_request(struct pwb_context *ctx,
const char *user,
const char *oldpass,
const char *newpass,
time_t pwd_last_set)
{
wbcErr wbc_status;
struct wbcChangePasswordParams params;
struct wbcAuthErrorInfo *error = NULL;
struct wbcUserPasswordPolicyInfo *policy = NULL;
enum wbcPasswordChangeRejectReason reject_reason = -1;
uint32_t flags = 0;
int i;
const char *codes[] = {
"NT_STATUS_BACKUP_CONTROLLER",
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_ACCESS_DENIED",
"NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
"NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
"NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
};
int ret = PAM_AUTH_ERR;
ZERO_STRUCT(params);
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
flags |= WBFLAG_PAM_KRB5 |
WBFLAG_PAM_CONTACT_TRUSTDOM;
}
if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
flags |= WBFLAG_PAM_CACHED_LOGIN;
}
params.account_name = user;
params.level = WBC_CHANGE_PASSWORD_LEVEL_PLAIN;
params.old_password.plaintext = oldpass;
params.new_password.plaintext = newpass;
params.flags = flags;
wbc_status = wbcCtxChangeUserPasswordEx(ctx->wbc_ctx,
&params,
&error,
&reject_reason,
&policy);
ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcChangeUserPasswordEx");
if (WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_NOTICE,
"user '%s' password changed", user);
return PAM_SUCCESS;
}
if (!error) {
wbcFreeMemory(policy);
return ret;
}
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret = ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
ret = _ret;
goto done;
}
}
if (!strcasecmp(error->nt_string,
"NT_STATUS_PASSWORD_RESTRICTION")) {
char *pwd_restriction_string = NULL;
SMB_TIME_T min_pwd_age = 0;
if (policy) {
min_pwd_age = policy->min_passwordage;
}
/* FIXME: avoid to send multiple PAM messages after another */
switch ((int)reject_reason) {
case -1:
break;
case WBC_PWD_CHANGE_NO_ERROR:
if ((min_pwd_age > 0) &&
(pwd_last_set + min_pwd_age > time(NULL))) {
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_TOO_RECENT");
}
break;
case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_TOO_SHORT");
break;
case WBC_PWD_CHANGE_PWD_IN_HISTORY:
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_HISTORY_CONFLICT");
break;
case WBC_PWD_CHANGE_NOT_COMPLEX:
_make_remark(ctx, PAM_ERROR_MSG,
_("Password does not meet "
"complexity requirements"));
break;
default:
_pam_log_debug(ctx, LOG_DEBUG,
"unknown password change "
"reject reason: %d",
reject_reason);
break;
}
pwd_restriction_string =
_pam_compose_pwd_restriction_string(ctx, policy);
if (pwd_restriction_string) {
_make_remark(ctx, PAM_ERROR_MSG,
pwd_restriction_string);
TALLOC_FREE(pwd_restriction_string);
}
}
done:
wbcFreeMemory(error);
wbcFreeMemory(policy);
return ret;
}
/*
* Checks if a user has an account
*
* return values:
* 1 = User not found
* 0 = OK
* -1 = System error
*/
static int valid_user(struct pwb_context *ctx,
const char *user)
{
/* check not only if the user is available over NSS calls, also make
* sure it's really a winbind user, this is important when stacking PAM
* modules in the 'account' or 'password' facility. */
wbcErr wbc_status;
struct passwd *pwd = NULL;
struct passwd *wb_pwd = NULL;
pwd = getpwnam(user);
if (pwd == NULL) {
return 1;
}
wbc_status = wbcCtxGetpwnam(ctx->wbc_ctx, user, &wb_pwd);
wbcFreeMemory(wb_pwd);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
wbcErrorString(wbc_status));
}
switch (wbc_status) {
case WBC_ERR_UNKNOWN_USER:
/* match other insane libwbclient return codes */
case WBC_ERR_WINBIND_NOT_AVAILABLE:
case WBC_ERR_DOMAIN_NOT_FOUND:
return 1;
case WBC_ERR_SUCCESS:
return 0;
default:
break;
}
return -1;
}
static char *_pam_delete(register char *xx)
{
_pam_overwrite(xx);
_pam_drop(xx);
return NULL;
}
/*
* obtain a password from the user
*/
static int _winbind_read_password(struct pwb_context *ctx,
unsigned int ctrl,
const char *comment,
const char *prompt1,
const char *prompt2,
const char **pass)
{
int authtok_flag;
int retval;
const char *item;
char *token;
_pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
/*
* make sure nothing inappropriate gets returned
*/
*pass = token = NULL;
/*
* which authentication token are we getting?
*/
if (on(WINBIND__OLD_PASSWORD, ctrl)) {
authtok_flag = PAM_OLDAUTHTOK;
} else {
authtok_flag = PAM_AUTHTOK;
}
/*
* should we obtain the password from a PAM item ?
*/
if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
retval = pam_get_item(ctx->pamh,
authtok_flag,
(const void **) &item);
if (retval != PAM_SUCCESS) {
/* very strange. */
_pam_log(ctx, LOG_ALERT,
"pam_get_item returned error "
"to unix-read-password");
return retval;
} else if (item != NULL) { /* we have a password! */
*pass = item;
item = NULL;
_pam_log(ctx, LOG_DEBUG,
"pam_get_item returned a password");
return PAM_SUCCESS;
} else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
} else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
&& off(WINBIND__OLD_PASSWORD, ctrl)) {
return PAM_AUTHTOK_RECOVER_ERR;
}
}
/*
* getting here implies we will have to get the password from the
* user directly.
*/
{
struct pam_message msg[3];
const struct pam_message *pmsg[3];
struct pam_response *resp;
int i, replies;
/* prepare to converse */
if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
pmsg[0] = &msg[0];
msg[0].msg_style = PAM_TEXT_INFO;
msg[0].msg = discard_const_p(char, comment);
i = 1;
} else {
i = 0;
}
pmsg[i] = &msg[i];
msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
msg[i++].msg = discard_const_p(char, prompt1);
replies = 1;
if (prompt2 != NULL) {
pmsg[i] = &msg[i];
msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
msg[i++].msg = discard_const_p(char, prompt2);
++replies;
}
/* so call the conversation expecting i responses */
resp = NULL;
retval = converse(ctx->pamh, i, pmsg, &resp);
if (resp == NULL) {
if (retval == PAM_SUCCESS) {
retval = PAM_AUTHTOK_RECOVER_ERR;
}
goto done;
}
if (retval != PAM_SUCCESS) {
_pam_drop_reply(resp, i);
goto done;
}
/* interpret the response */
token = x_strdup(resp[i - replies].resp);
if (!token) {
_pam_log(ctx, LOG_NOTICE,
"could not recover "
"authentication token");
retval = PAM_AUTHTOK_RECOVER_ERR;
goto done;
}
if (replies == 2) {
/* verify that password entered correctly */
if (!resp[i - 1].resp ||
strcmp(token, resp[i - 1].resp)) {
_pam_delete(token); /* mistyped */
retval = PAM_AUTHTOK_RECOVER_ERR;
_make_remark(ctx, PAM_ERROR_MSG,
MISTYPED_PASS);
}
}
/*
* tidy up the conversation (resp_retcode) is ignored
* -- what is it for anyway? AGM
*/
_pam_drop_reply(resp, i);
}
done:
if (retval != PAM_SUCCESS) {
_pam_log_debug(ctx, LOG_DEBUG,
"unable to obtain a password");
return retval;
}
/* 'token' is the entered password */
/* we store this password as an item */
retval = pam_set_item(ctx->pamh, authtok_flag, token);
_pam_delete(token); /* clean it up */
if (retval != PAM_SUCCESS ||
(retval = pam_get_item(ctx->pamh, authtok_flag, (const void **) &item)) != PAM_SUCCESS) {
_pam_log(ctx, LOG_CRIT, "error manipulating password");
return retval;
}
*pass = item;
item = NULL; /* break link to password */
return PAM_SUCCESS;
}
static const char *get_conf_item_string(struct pwb_context *ctx,
const char *item,
int config_flag)
{
int i = 0;
const char *parm_opt = NULL;
if (!(ctx->ctrl & config_flag)) {
goto out;
}
/* let the pam opt take precedence over the pam_winbind.conf option */
for (i=0; i<ctx->argc; i++) {
if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
char *p;
if ((p = strchr(ctx->argv[i], '=')) == NULL) {
_pam_log(ctx, LOG_INFO,
"no \"=\" delimiter for \"%s\" found\n",
item);
goto out;
}
_pam_log_debug(ctx, LOG_INFO,
"PAM config: %s '%s'\n", item, p+1);
return p + 1;
}
}
if (ctx->dict) {
char *key = NULL;
key = talloc_asprintf(ctx, "global:%s", item);
if (!key) {
goto out;
}
parm_opt = tiniparser_getstring_nonempty(ctx->dict, key, NULL);
TALLOC_FREE(key);
_pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
item, parm_opt);
}
out:
return parm_opt;
}
static int get_config_item_int(struct pwb_context *ctx,
const char *item,
int config_flag)
{
int i, parm_opt = -1;
if (!(ctx->ctrl & config_flag)) {
goto out;
}
/* let the pam opt take precedence over the pam_winbind.conf option */
for (i = 0; i < ctx->argc; i++) {
if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
char *p;
if ((p = strchr(ctx->argv[i], '=')) == NULL) {
_pam_log(ctx, LOG_INFO,
"no \"=\" delimiter for \"%s\" found\n",
item);
goto out;
}
parm_opt = atoi(p + 1);
_pam_log_debug(ctx, LOG_INFO,
"PAM config: %s '%d'\n",
item, parm_opt);
return parm_opt;
}
}
if (ctx->dict) {
char *key = NULL;
key = talloc_asprintf(ctx, "global:%s", item);
if (!key) {
goto out;
}
parm_opt = tiniparser_getint(ctx->dict, key, -1);
TALLOC_FREE(key);
_pam_log_debug(ctx, LOG_INFO,
"CONFIG file: %s '%d'\n",
item, parm_opt);
}
out:
return parm_opt;
}
static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
{
return get_conf_item_string(ctx, "krb5_ccache_type",
WINBIND_KRB5_CCACHE_TYPE);
}
static const char *get_member_from_config(struct pwb_context *ctx)
{
const char *ret = NULL;
ret = get_conf_item_string(ctx, "require_membership_of",
WINBIND_REQUIRED_MEMBERSHIP);
if (ret != NULL) {
return ret;
}
return get_conf_item_string(ctx, "require-membership-of",
WINBIND_REQUIRED_MEMBERSHIP);
}
static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
{
int ret;
ret = get_config_item_int(ctx, "warn_pwd_expire",
WINBIND_WARN_PWD_EXPIRE);
/* no or broken setting */
if (ret < 0) {
return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
}
return ret;
}
/**
* Retrieve the winbind separator.
*
* @param ctx PAM winbind context.
*
* @return string separator character. NULL on failure.
*/
static char winbind_get_separator(struct pwb_context *ctx)
{
wbcErr wbc_status;
static struct wbcInterfaceDetails *details = NULL;
wbc_status = wbcCtxInterfaceDetails(ctx->wbc_ctx, &details);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_ERR,
"Could not retrieve winbind interface details: %s",
wbcErrorString(wbc_status));
return '\0';
}
if (!details) {
return '\0';
}
return details->winbind_separator;
}
/**
* Convert a upn to a name.
*
* @param ctx PAM winbind context.
* @param upn User UPN to be translated.
*
* @return converted name. NULL pointer on failure. Caller needs to free.
*/
static char* winbind_upn_to_username(struct pwb_context *ctx,
const char *upn)
{
char sep;
wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
struct wbcDomainSid sid;
enum wbcSidType type;
char *domain = NULL;
char *name;
char *p;
char *result;
/* This cannot work when the winbind separator = @ */
sep = winbind_get_separator(ctx);
if (!sep || sep == '@') {
return NULL;
}
name = talloc_strdup(ctx, upn);
if (!name) {
return NULL;
}
p = strchr(name, '@');
if (p == NULL) {
TALLOC_FREE(name);
return NULL;
}
*p = '\0';
domain = p + 1;
/* Convert the UPN to a SID */
wbc_status = wbcCtxLookupName(ctx->wbc_ctx, domain, name, &sid, &type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NULL;
}
/* Convert the the SID back to the sAMAccountName */
wbc_status = wbcCtxLookupSid(ctx->wbc_ctx, &sid, &domain, &name, &type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NULL;
}
result = talloc_asprintf(ctx, "%s%c%s", domain, sep, name);
wbcFreeMemory(domain);
wbcFreeMemory(name);
return result;
}
static int _pam_delete_cred(pam_handle_t *pamh, int flags,
int argc, enum pam_winbind_request_type type,
const char **argv)
{
int retval = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
struct wbcLogoffUserParams logoff;
struct wbcAuthErrorInfo *error = NULL;
const char *user;
wbcErr wbc_status = WBC_ERR_SUCCESS;
ZERO_STRUCT(logoff);
retval = _pam_winbind_init_context(pamh, flags, argc, argv, type, &ctx);
if (retval != PAM_SUCCESS) {
return retval;
}
_PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
/* destroy the ccache here */
uint32_t wbc_flags = 0;
const char *ccname = NULL;
struct passwd *pwd = NULL;
retval = pam_get_user(pamh, &user, _("Username: "));
if (retval != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"could not identify user");
goto out;
}
if (user == NULL) {
_pam_log(ctx, LOG_ERR,
"username was NULL!");
retval = PAM_USER_UNKNOWN;
goto out;
}
_pam_log_debug(ctx, LOG_DEBUG,
"username [%s] obtained", user);
ccname = pam_getenv(pamh, "KRB5CCNAME");
if (ccname == NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"user has no KRB5CCNAME environment");
}
pwd = getpwnam(user);
if (pwd == NULL) {
retval = PAM_USER_UNKNOWN;
goto out;
}
wbc_flags = WBFLAG_PAM_KRB5 |
WBFLAG_PAM_CONTACT_TRUSTDOM;
logoff.username = user;
if (ccname) {
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"ccfilename",
0,
discard_const_p(uint8_t, ccname),
strlen(ccname)+1);
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
}
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"flags",
0,
(uint8_t *)&wbc_flags,
sizeof(wbc_flags));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"user_uid",
0,
(uint8_t *)&pwd->pw_uid,
sizeof(pwd->pw_uid));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
wbc_status = wbcCtxLogoffUserEx(ctx->wbc_ctx, &logoff, &error);
retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogoffUser");
wbcFreeMemory(logoff.blobs);
logoff.blobs = NULL;
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_INFO,
"failed to logoff user %s: %s\n",
user, wbcErrorString(wbc_status));
}
}
out:
if (logoff.blobs) {
wbcFreeMemory(logoff.blobs);
}
if (!WBC_ERROR_IS_OK(wbc_status)) {
retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogoffUser");
}
wbcFreeMemory(error);
/*
* Delete the krb5 ccname variable from the PAM environment
* if it was set by winbind.
*/
if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
pam_putenv(pamh, "KRB5CCNAME");
}
_PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
TALLOC_FREE(ctx);
return retval;
}
#ifdef SECURITY_OPENPAM_H_INCLUDED
/*
* Logic below is copied from openpam_check_error_code() in
*./contrib/openpam/lib/libpam/openpam_dispatch.c on FreeBSD.
*/
static int openpam_convert_error_code(struct pwb_context *ctx,
enum pam_winbind_request_type req,
int r)
{
if (r == PAM_SUCCESS ||
r == PAM_SYSTEM_ERR ||
r == PAM_SERVICE_ERR ||
r == PAM_BUF_ERR ||
r == PAM_CONV_ERR ||
r == PAM_PERM_DENIED ||
r == PAM_ABORT) {
return r;
}
/* specific winbind request types */
switch (req) {
case PAM_WINBIND_AUTHENTICATE:
if (r == PAM_AUTH_ERR ||
r == PAM_CRED_INSUFFICIENT ||
r == PAM_AUTHINFO_UNAVAIL ||
r == PAM_USER_UNKNOWN ||
r == PAM_MAXTRIES) {
return r;
}
break;
case PAM_WINBIND_SETCRED:
if (r == PAM_CRED_UNAVAIL ||
r == PAM_CRED_EXPIRED ||
r == PAM_USER_UNKNOWN ||
r == PAM_CRED_ERR) {
return r;
}
break;
case PAM_WINBIND_ACCT_MGMT:
if (r == PAM_USER_UNKNOWN ||
r == PAM_AUTH_ERR ||
r == PAM_NEW_AUTHTOK_REQD ||
r == PAM_ACCT_EXPIRED) {
return r;
}
break;
case PAM_WINBIND_OPEN_SESSION:
case PAM_WINBIND_CLOSE_SESSION:
if (r == PAM_SESSION_ERR) {
return r;
}
break;
case PAM_WINBIND_CHAUTHTOK:
if (r == PAM_PERM_DENIED ||
r == PAM_AUTHTOK_ERR ||
r == PAM_AUTHTOK_RECOVERY_ERR ||
r == PAM_AUTHTOK_LOCK_BUSY ||
r == PAM_AUTHTOK_DISABLE_AGING ||
r == PAM_TRY_AGAIN) {
return r;
}
break;
default:
break;
}
_pam_log(ctx, LOG_INFO,
"Converting PAM error [%d] to PAM_SERVICE_ERR.\n", r);
return PAM_SERVICE_ERR;
};
#define pam_error_code(a, b, c) openpam_convert_error_code(a, b, c)
#else
#define pam_error_code(a, b, c) (c)
#endif
PAM_EXTERN
int pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
const char *username;
const char *password;
const char *member = NULL;
const char *cctype = NULL;
int warn_pwd_expire;
int retval = PAM_AUTH_ERR;
char *username_ret = NULL;
char *new_authtok_required = NULL;
char *real_username = NULL;
struct pwb_context *ctx = NULL;
retval = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_AUTHENTICATE, &ctx);
if (retval != PAM_SUCCESS) {
return retval;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
/* Get the username */
retval = pam_get_user(pamh, &username, NULL);
if ((retval != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG,
"can not get the username");
retval = PAM_SERVICE_ERR;
goto out;
}
#if defined(AIX)
/* Decode the user name since AIX does not support logn user
names by default. The name is encoded as _#uid. */
if (username[0] == '_') {
uid_t id = atoi(&username[1]);
struct passwd *pw = NULL;
if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
real_username = strdup(pw->pw_name);
}
}
#endif
if (!real_username) {
/* Just making a copy of the username we got from PAM */
if ((real_username = strdup(username)) == NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"memory allocation failure when copying "
"username");
retval = PAM_SERVICE_ERR;
goto out;
}
}
/* Maybe this was a UPN */
if (strchr(real_username, '@') != NULL) {
char *samaccountname = NULL;
samaccountname = winbind_upn_to_username(ctx,
real_username);
if (samaccountname) {
free(real_username);
real_username = strdup(samaccountname);
}
}
retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
_("Password: "), NULL,
&password);
if (retval != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"Could not retrieve user's password");
retval = PAM_AUTHTOK_ERR;
goto out;
}
/* Let's not give too much away in the log file */
#ifdef DEBUG_PASSWORD
_pam_log_debug(ctx, LOG_INFO,
"Verify user '%s' with password '%s'",
real_username, password);
#else
_pam_log_debug(ctx, LOG_INFO,
"Verify user '%s'", real_username);
#endif
member = get_member_from_config(ctx);
cctype = get_krb5_cc_type_from_config(ctx);
warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
/* Now use the username to look up password */
retval = winbind_auth_request(ctx, real_username, password,
member, cctype, warn_pwd_expire,
NULL, NULL, NULL, &username_ret);
if (retval == PAM_NEW_AUTHTOK_REQD ||
retval == PAM_AUTHTOK_EXPIRED) {
char *new_authtok_required_during_auth = NULL;
new_authtok_required = talloc_asprintf(NULL, "%d", retval);
if (!new_authtok_required) {
retval = PAM_BUF_ERR;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
new_authtok_required,
_pam_winbind_cleanup_func);
retval = PAM_SUCCESS;
new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
if (!new_authtok_required_during_auth) {
retval = PAM_BUF_ERR;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
new_authtok_required_during_auth,
_pam_winbind_cleanup_func);
goto out;
}
out:
if (username_ret) {
pam_set_item (pamh, PAM_USER, username_ret);
_pam_log_debug(ctx, LOG_INFO,
"Returned user was '%s'", username_ret);
free(username_ret);
}
if (real_username) {
free(real_username);
}
if (!new_authtok_required) {
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
}
if (retval != PAM_SUCCESS) {
_pam_free_data_info3(pamh);
}
_PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
TALLOC_FREE(ctx);
return retval;
}
PAM_EXTERN
int pam_sm_setcred(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SYSTEM_ERR;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_SETCRED, &ctx);
if (ret != PAM_SUCCESS) {
return ret;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
switch (flags & ~PAM_SILENT) {
case PAM_DELETE_CRED:
ret = _pam_delete_cred(pamh, flags, argc,
PAM_WINBIND_SETCRED, argv);
break;
case PAM_REFRESH_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_REFRESH_CRED not implemented");
ret = PAM_SUCCESS;
break;
case PAM_REINITIALIZE_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_REINITIALIZE_CRED not implemented");
ret = PAM_SUCCESS;
break;
case PAM_ESTABLISH_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_ESTABLISH_CRED not implemented");
ret = PAM_SUCCESS;
break;
default:
ret = PAM_SYSTEM_ERR;
break;
}
_PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
TALLOC_FREE(ctx);
return pam_error_code(ctx, PAM_WINBIND_SETCRED, ret);
}
/*
* Account management. We want to verify that the account exists
* before returning PAM_SUCCESS
*/
PAM_EXTERN
int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
const char *username;
int ret = PAM_USER_UNKNOWN;
const char *tmp = NULL;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_ACCT_MGMT, &ctx);
if (ret != PAM_SUCCESS) {
return ret;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
/* Get the username */
ret = pam_get_user(pamh, &username, NULL);
if ((ret != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG,
"can not get the username");
ret = PAM_SERVICE_ERR;
goto out;
}
/* Verify the username */
ret = valid_user(ctx, username);
switch (ret) {
case -1:
/* some sort of system error. The log was already printed */
ret = PAM_SERVICE_ERR;
goto out;
case 1:
/* the user does not exist */
_pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
username);
if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
ret = PAM_IGNORE;
goto out;
}
ret = PAM_USER_UNKNOWN;
goto out;
case 0:
pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
(const void **)&tmp);
if (tmp != NULL) {
ret = atoi(tmp);
switch (ret) {
case PAM_AUTHTOK_EXPIRED:
/* Since new token is required in this case */
FALL_THROUGH;
case PAM_NEW_AUTHTOK_REQD:
_pam_log(ctx, LOG_WARNING,
"pam_sm_acct_mgmt success but %s is set",
PAM_WINBIND_NEW_AUTHTOK_REQD);
_pam_log(ctx, LOG_NOTICE,
"user '%s' needs new password",
username);
/* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
ret = PAM_NEW_AUTHTOK_REQD;
goto out;
default:
_pam_log(ctx, LOG_WARNING,
"pam_sm_acct_mgmt success");
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", username);
ret = PAM_SUCCESS;
goto out;
}
}
/* Otherwise, the authentication looked good */
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", username);
ret = PAM_SUCCESS;
goto out;
default:
/* we don't know anything about this return value */
_pam_log(ctx, LOG_ERR,
"internal module error (ret = %d, user = '%s')",
ret, username);
ret = PAM_SERVICE_ERR;
goto out;
}
/* should not be reached */
ret = PAM_IGNORE;
out:
_PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
TALLOC_FREE(ctx);
return pam_error_code(ctx, PAM_WINBIND_ACCT_MGMT, ret);
}
PAM_EXTERN
int pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_OPEN_SESSION, &ctx);
if (ret != PAM_SUCCESS) {
return ret;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
if (ctx->ctrl & WINBIND_MKHOMEDIR) {
/* check and create homedir */
ret = _pam_mkhomedir(ctx);
}
_PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
TALLOC_FREE(ctx);
return pam_error_code(ctx, PAM_WINBIND_OPEN_SESSION, ret);
}
PAM_EXTERN
int pam_sm_close_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_CLOSE_SESSION, &ctx);
if (ret != PAM_SUCCESS) {
return ret;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
_PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
TALLOC_FREE(ctx);
return pam_error_code(ctx, PAM_WINBIND_CLOSE_SESSION, ret);
}
/**
* evaluate whether we need to re-authenticate with kerberos after a
* password change
*
* @param ctx PAM winbind context.
* @param user The username
*
* @return boolean Returns true if required, false if not.
*/
static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
const char *user)
{
/* Make sure that we only do this if a) the chauthtok got initiated
* during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
* later password change via the "passwd" command if done by the user
* itself
* NB. If we login from gdm or xdm and the password expires,
* we change the password, but there is no memory cache.
* Thus, even for passthrough login, we should do the
* authentication again to update memory cache.
* --- BoYang
* */
const char *new_authtok_reqd_during_auth = NULL;
struct passwd *pwd = NULL;
pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
(const void **) &new_authtok_reqd_during_auth);
pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
NULL, NULL);
if (new_authtok_reqd_during_auth) {
return true;
}
pwd = getpwnam(user);
if (!pwd) {
return false;
}
if (getuid() == pwd->pw_uid) {
return true;
}
return false;
}
PAM_EXTERN
int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
int argc, const char **argv)
{
unsigned int lctrl;
int ret;
bool cached_login = false;
/* <DO NOT free() THESE> */
const char *user;
const char *pass_old;
const char *pass_new;
/* </DO NOT free() THESE> */
char *Announce;
int retry = 0;
char *username_ret = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv,
PAM_WINBIND_CHAUTHTOK, &ctx);
if (ret != PAM_SUCCESS) {
return ret;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
/* clearing offline bit for auth */
ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
/*
* First get the name of a user
*/
ret = pam_get_user(pamh, &user, _("Username: "));
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"password - could not identify user");
goto out;
}
if (user == NULL) {
_pam_log(ctx, LOG_ERR, "username was NULL!");
ret = PAM_USER_UNKNOWN;
goto out;
}
_pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
/* check if this is really a user in winbindd, not only in NSS */
ret = valid_user(ctx, user);
switch (ret) {
case 1:
ret = PAM_USER_UNKNOWN;
goto out;
case -1:
ret = PAM_SYSTEM_ERR;
goto out;
default:
break;
}
/*
* obtain and verify the current password (OLDAUTHTOK) for
* the user.
*/
if (flags & PAM_PRELIM_CHECK) {
time_t pwdlastset_prelim = 0;
/* instruct user what is happening */
#define greeting _("Changing password for")
Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
if (!Announce) {
_pam_log(ctx, LOG_CRIT,
"password - out of memory");
ret = PAM_BUF_ERR;
goto out;
}
#undef greeting
lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
ret = _winbind_read_password(ctx, lctrl,
Announce,
_("(current) NT password: "),
NULL,
(const char **) &pass_old);
TALLOC_FREE(Announce);
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_NOTICE,
"password - (old) token not obtained");
goto out;
}
/* verify that this is the password for this user */
ret = winbind_auth_request(ctx, user, pass_old,
NULL, NULL, 0,
&error, NULL,
&pwdlastset_prelim, NULL);
if (ret != PAM_ACCT_EXPIRED &&
ret != PAM_AUTHTOK_EXPIRED &&
ret != PAM_NEW_AUTHTOK_REQD &&
ret != PAM_SUCCESS) {
pass_old = NULL;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
(void *)pwdlastset_prelim, NULL);
ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
(const void *) pass_old);
pass_old = NULL;
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_CRIT,
"failed to set PAM_OLDAUTHTOK");
}
} else if (flags & PAM_UPDATE_AUTHTOK) {
time_t pwdlastset_update = 0;
/*
* obtain the proposed password
*/
/*
* get the old token back.
*/
ret = pam_get_item(pamh, PAM_OLDAUTHTOK, (const void **) &pass_old);
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_NOTICE,
"user not authenticated");
goto out;
}
lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
lctrl |= WINBIND_USE_FIRST_PASS_ARG;
}
if (on(WINBIND_TRY_AUTHTOK_ARG, lctrl)) {
lctrl |= WINBIND_TRY_FIRST_PASS_ARG;
}
retry = 0;
ret = PAM_AUTHTOK_ERR;
while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
/*
* use_authtok is to force the use of a previously entered
* password -- needed for pluggable password strength checking
*/
ret = _winbind_read_password(ctx, lctrl,
NULL,
_("Enter new NT password: "),
_("Retype new NT password: "),
(const char **)&pass_new);
if (ret != PAM_SUCCESS) {
_pam_log_debug(ctx, LOG_ALERT,
"password - "
"new password not obtained");
pass_old = NULL;/* tidy up */
goto out;
}
/*
* At this point we know who the user is and what they
* propose as their new password. Verify that the new
* password is acceptable.
*/
if (pass_new[0] == '\0') {/* "\0" password = NULL */
pass_new = NULL;
}
}
/*
* By reaching here we have approved the passwords and must now
* rebuild the password database file.
*/
pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
(const void **) &pwdlastset_update);
/*
* if cached creds were enabled, make sure to set the
* WINBIND_CACHED_LOGIN bit here in order to have winbindd
* update the cached creds storage - gd
*/
if (cached_login) {
ctx->ctrl |= WINBIND_CACHED_LOGIN;
}
ret = winbind_chauthtok_request(ctx, user, pass_old,
pass_new, pwdlastset_update);
if (ret != PAM_SUCCESS) {
pass_old = pass_new = NULL;
goto out;
}
if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
const char *member = NULL;
const char *cctype = NULL;
int warn_pwd_expire;
struct wbcLogonUserInfo *info = NULL;
member = get_member_from_config(ctx);
cctype = get_krb5_cc_type_from_config(ctx);
warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
/* Keep WINBIND_CACHED_LOGIN bit for
* authentication after changing the password.
* This will update the cached credentials in case
* that winbindd_dual_pam_chauthtok() fails
* to update them.
* --- BoYang
* */
ret = winbind_auth_request(ctx, user, pass_new,
member, cctype, 0,
&error, &info,
NULL, &username_ret);
pass_old = pass_new = NULL;
if (ret == PAM_SUCCESS) {
struct wbcAuthUserInfo *user_info = NULL;
if (info && info->info) {
user_info = info->info;
}
/* warn a user if the password is about to
* expire soon */
_pam_warn_password_expiry(ctx, user_info,
warn_pwd_expire,
NULL, NULL);
/* set some info3 info for other modules in the
* stack */
_pam_set_data_info3(ctx, user_info);
/* put krb5ccname into env */
_pam_setup_krb5_env(ctx, info);
if (username_ret) {
pam_set_item(pamh, PAM_USER,
username_ret);
_pam_log_debug(ctx, LOG_INFO,
"Returned user was '%s'",
username_ret);
free(username_ret);
}
}
if (info && info->blobs) {
wbcFreeMemory(info->blobs);
}
wbcFreeMemory(info);
goto out;
}
} else {
ret = PAM_SERVICE_ERR;
}
out:
{
/* Deal with offline errors. */
int i;
const char *codes[] = {
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_ACCESS_DENIED"
};
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
break;
}
}
}
wbcFreeMemory(error);
_PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
TALLOC_FREE(ctx);
return pam_error_code(ctx, PAM_WINBIND_CHAUTHTOK, ret);
}
#ifdef PAM_STATIC
/* static module data */
struct pam_module _pam_winbind_modstruct = {
MODULE_NAME,
pam_sm_authenticate,
pam_sm_setcred,
pam_sm_acct_mgmt,
pam_sm_open_session,
pam_sm_close_session,
pam_sm_chauthtok
};
#endif
/*
* Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
* Copyright (c) Tim Potter <tpot@samba.org> 2000
* Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
* Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
* Copyright (c) Jan Rêkorajski 1999.
* Copyright (c) Andrew G. Morgan 1996-8.
* Copyright (c) Alex O. Yuriev, 1996.
* Copyright (c) Cristian Gafton 1996.
* Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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