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auth-request.c
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auth-request.c
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/* Copyright (c) 2002-2016 Dovecot authors, see the included COPYING file */
#include "auth-common.h"
#include "ioloop.h"
#include "buffer.h"
#include "hash.h"
#include "sha1.h"
#include "hex-binary.h"
#include "str.h"
#include "safe-memset.h"
#include "str-sanitize.h"
#include "strescape.h"
#include "var-expand.h"
#include "dns-lookup.h"
#include "auth-cache.h"
#include "auth-request.h"
#include "auth-request-handler.h"
#include "auth-request-stats.h"
#include "auth-client-connection.h"
#include "auth-master-connection.h"
#include "auth-policy.h"
#include "passdb.h"
#include "passdb-blocking.h"
#include "passdb-cache.h"
#include "passdb-template.h"
#include "userdb-blocking.h"
#include "userdb-template.h"
#include "password-scheme.h"
#include <sys/stat.h>
#define AUTH_SUBSYS_PROXY "proxy"
#define AUTH_DNS_SOCKET_PATH "dns-client"
#define AUTH_DNS_DEFAULT_TIMEOUT_MSECS (1000*10)
#define AUTH_DNS_WARN_MSECS 500
#define AUTH_REQUEST_MAX_DELAY_SECS (60*5)
#define CACHED_PASSWORD_SCHEME "SHA1"
struct auth_request_proxy_dns_lookup_ctx {
struct auth_request *request;
auth_request_proxy_cb_t *callback;
struct dns_lookup *dns_lookup;
};
struct auth_policy_check_ctx {
enum {
AUTH_POLICY_CHECK_TYPE_PLAIN,
AUTH_POLICY_CHECK_TYPE_LOOKUP,
AUTH_POLICY_CHECK_TYPE_SUCCESS,
} type;
struct auth_request *request;
buffer_t *success_data;
verify_plain_callback_t *callback_plain;
lookup_credentials_callback_t *callback_lookup;
};
const char auth_default_subsystems[2];
unsigned int auth_request_state_count[AUTH_REQUEST_STATE_MAX];
static void get_log_prefix(string_t *str, struct auth_request *auth_request,
const char *subsystem);
static void
auth_request_userdb_import(struct auth_request *request, const char *args);
static
void auth_request_verify_plain_continue(struct auth_request *request,
verify_plain_callback_t *callback);
static
void auth_request_lookup_credentials_policy_continue(struct auth_request *request,
lookup_credentials_callback_t *callback);
static
void auth_request_policy_check_callback(int result, void *context);
struct auth_request *
auth_request_new(const struct mech_module *mech)
{
struct auth_request *request;
request = mech->auth_new();
request->state = AUTH_REQUEST_STATE_NEW;
auth_request_state_count[AUTH_REQUEST_STATE_NEW]++;
request->refcount = 1;
request->last_access = ioloop_time;
request->session_pid = (pid_t)-1;
request->set = global_auth_settings;
request->debug = request->set->debug;
request->mech = mech;
request->mech_name = mech->mech_name;
request->extra_fields = auth_fields_init(request->pool);
return request;
}
struct auth_request *auth_request_new_dummy(void)
{
struct auth_request *request;
pool_t pool;
pool = pool_alloconly_create(MEMPOOL_GROWING"auth_request", 1024);
request = p_new(pool, struct auth_request, 1);
request->pool = pool;
request->state = AUTH_REQUEST_STATE_NEW;
auth_request_state_count[AUTH_REQUEST_STATE_NEW]++;
request->refcount = 1;
request->last_access = ioloop_time;
request->session_pid = (pid_t)-1;
request->set = global_auth_settings;
request->debug = request->set->debug;
request->extra_fields = auth_fields_init(request->pool);
return request;
}
void auth_request_set_state(struct auth_request *request,
enum auth_request_state state)
{
if (request->state == state)
return;
i_assert(request->to_penalty == NULL);
i_assert(auth_request_state_count[request->state] > 0);
auth_request_state_count[request->state]--;
auth_request_state_count[state]++;
request->state = state;
auth_refresh_proctitle();
}
void auth_request_init(struct auth_request *request)
{
struct auth *auth;
auth = auth_request_get_auth(request);
request->set = auth->set;
/* NOTE: request->debug may already be TRUE here */
if (request->set->debug)
request->debug = TRUE;
request->passdb = auth->passdbs;
request->userdb = auth->userdbs;
}
struct auth *auth_request_get_auth(struct auth_request *request)
{
return auth_find_service(request->service);
}
void auth_request_success(struct auth_request *request,
const void *data, size_t data_size)
{
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
/* perform second policy lookup here */
struct auth_policy_check_ctx *ctx = p_new(request->pool, struct auth_policy_check_ctx, 1);
ctx->request = request;
ctx->success_data = buffer_create_dynamic(request->pool, data_size);
buffer_append(ctx->success_data, data, data_size);
ctx->type = AUTH_POLICY_CHECK_TYPE_SUCCESS;
auth_policy_check(request, request->mech_password, auth_request_policy_check_callback, ctx);
}
static
void auth_request_success_continue(struct auth_policy_check_ctx *ctx)
{
struct auth_request *request = ctx->request;
struct auth_stats *stats;
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
if (request->to_penalty != NULL)
timeout_remove(&request->to_penalty);
if (request->failed || !request->passdb_success) {
/* password was valid, but some other check failed. */
auth_request_fail(request);
return;
}
if (request->delay_until > ioloop_time) {
unsigned int delay_secs = request->delay_until - ioloop_time;
request->to_penalty = timeout_add(delay_secs * 1000,
auth_request_success_continue, ctx);
return;
}
request->successful = TRUE;
if (ctx->success_data->used > 0 && !request->final_resp_ok) {
/* we'll need one more SASL round, since client doesn't support
the final SASL response */
auth_request_handler_reply_continue(request,
ctx->success_data->data, ctx->success_data->used);
return;
}
stats = auth_request_stats_get(request);
stats->auth_success_count++;
if (request->master_user != NULL)
stats->auth_master_success_count++;
auth_request_set_state(request, AUTH_REQUEST_STATE_FINISHED);
auth_request_refresh_last_access(request);
auth_request_handler_reply(request, AUTH_CLIENT_RESULT_SUCCESS,
ctx->success_data->data, ctx->success_data->used);
}
void auth_request_fail(struct auth_request *request)
{
struct auth_stats *stats;
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
stats = auth_request_stats_get(request);
stats->auth_failure_count++;
auth_request_set_state(request, AUTH_REQUEST_STATE_FINISHED);
auth_request_refresh_last_access(request);
auth_request_handler_reply(request, AUTH_CLIENT_RESULT_FAILURE, "", 0);
}
void auth_request_internal_failure(struct auth_request *request)
{
request->internal_failure = TRUE;
auth_request_fail(request);
}
void auth_request_ref(struct auth_request *request)
{
request->refcount++;
}
void auth_request_unref(struct auth_request **_request)
{
struct auth_request *request = *_request;
*_request = NULL;
i_assert(request->refcount > 0);
if (--request->refcount > 0)
return;
auth_request_stats_send(request);
auth_request_state_count[request->state]--;
auth_refresh_proctitle();
if (request->mech_password != NULL) {
safe_memset(request->mech_password, 0,
strlen(request->mech_password));
}
if (request->dns_lookup_ctx != NULL)
dns_lookup_abort(&request->dns_lookup_ctx->dns_lookup);
if (request->to_abort != NULL)
timeout_remove(&request->to_abort);
if (request->to_penalty != NULL)
timeout_remove(&request->to_penalty);
if (request->mech != NULL)
request->mech->auth_free(request);
else
pool_unref(&request->pool);
}
static void
auth_str_add_keyvalue(string_t *dest, const char *key, const char *value)
{
str_append_c(dest, '\t');
str_append(dest, key);
if (value != NULL) {
str_append_c(dest, '=');
str_append_tabescaped(dest, value);
}
}
void auth_request_export(struct auth_request *request, string_t *dest)
{
str_append(dest, "user=");
str_append_tabescaped(dest, request->user);
auth_str_add_keyvalue(dest, "service", request->service);
if (request->master_user != NULL) {
auth_str_add_keyvalue(dest, "master-user",
request->master_user);
}
auth_str_add_keyvalue(dest, "original_username",
request->original_username);
if (request->requested_login_user != NULL) {
auth_str_add_keyvalue(dest, "requested-login-user",
request->requested_login_user);
}
if (request->local_ip.family != 0) {
auth_str_add_keyvalue(dest, "lip",
net_ip2addr(&request->local_ip));
}
if (request->remote_ip.family != 0) {
auth_str_add_keyvalue(dest, "rip",
net_ip2addr(&request->remote_ip));
}
if (request->local_port != 0)
str_printfa(dest, "\tlport=%u", request->local_port);
if (request->remote_port != 0)
str_printfa(dest, "\trport=%u", request->remote_port);
if (request->real_local_ip.family != 0) {
auth_str_add_keyvalue(dest, "real_lip",
net_ip2addr(&request->real_local_ip));
}
if (request->real_remote_ip.family != 0) {
auth_str_add_keyvalue(dest, "real_rip",
net_ip2addr(&request->real_remote_ip));
}
if (request->real_local_port != 0)
str_printfa(dest, "\treal_lport=%u", request->real_local_port);
if (request->real_remote_port != 0)
str_printfa(dest, "\treal_rport=%u", request->real_remote_port);
if (request->session_id != NULL)
str_printfa(dest, "\tsession=%s", request->session_id);
if (request->debug)
str_append(dest, "\tdebug");
if (request->secured)
str_append(dest, "\tsecured");
if (request->skip_password_check)
str_append(dest, "\tskip-password-check");
if (request->valid_client_cert)
str_append(dest, "\tvalid-client-cert");
if (request->no_penalty)
str_append(dest, "\tno-penalty");
if (request->successful)
str_append(dest, "\tsuccessful");
if (request->mech_name != NULL)
auth_str_add_keyvalue(dest, "mech", request->mech_name);
}
bool auth_request_import_info(struct auth_request *request,
const char *key, const char *value)
{
/* authentication and user lookups may set these */
if (strcmp(key, "service") == 0)
request->service = p_strdup(request->pool, value);
else if (strcmp(key, "lip") == 0) {
(void)net_addr2ip(value, &request->local_ip);
if (request->real_local_ip.family == 0)
request->real_local_ip = request->local_ip;
} else if (strcmp(key, "rip") == 0) {
(void)net_addr2ip(value, &request->remote_ip);
if (request->real_remote_ip.family == 0)
request->real_remote_ip = request->remote_ip;
} else if (strcmp(key, "lport") == 0) {
(void)net_str2port(value, &request->local_port);
if (request->real_local_port == 0)
request->real_local_port = request->local_port;
} else if (strcmp(key, "rport") == 0) {
(void)net_str2port(value, &request->remote_port);
if (request->real_remote_port == 0)
request->real_remote_port = request->remote_port;
}
else if (strcmp(key, "real_lip") == 0)
(void)net_addr2ip(value, &request->real_local_ip);
else if (strcmp(key, "real_rip") == 0)
(void)net_addr2ip(value, &request->real_remote_ip);
else if (strcmp(key, "real_lport") == 0)
(void)net_str2port(value, &request->real_local_port);
else if (strcmp(key, "real_rport") == 0)
(void)net_str2port(value, &request->real_remote_port);
else if (strcmp(key, "session") == 0)
request->session_id = p_strdup(request->pool, value);
else if (strcmp(key, "debug") == 0)
request->debug = TRUE;
else
return FALSE;
/* NOTE: keep in sync with auth_request_export() */
return TRUE;
}
bool auth_request_import_auth(struct auth_request *request,
const char *key, const char *value)
{
if (auth_request_import_info(request, key, value))
return TRUE;
/* auth client may set these */
if (strcmp(key, "secured") == 0)
request->secured = TRUE;
else if (strcmp(key, "final-resp-ok") == 0)
request->final_resp_ok = TRUE;
else if (strcmp(key, "no-penalty") == 0)
request->no_penalty = TRUE;
else if (strcmp(key, "valid-client-cert") == 0)
request->valid_client_cert = TRUE;
else if (strcmp(key, "cert_username") == 0) {
if (request->set->ssl_username_from_cert) {
/* get username from SSL certificate. it overrides
the username given by the auth mechanism. */
request->user = p_strdup(request->pool, value);
request->cert_username = TRUE;
}
} else {
return FALSE;
}
return TRUE;
}
bool auth_request_import_master(struct auth_request *request,
const char *key, const char *value)
{
pid_t pid;
/* master request lookups may set these */
if (strcmp(key, "session_pid") == 0) {
if (str_to_pid(value, &pid) == 0)
request->session_pid = pid;
} else if (strcmp(key, "request_auth_token") == 0)
request->request_auth_token = TRUE;
else
return FALSE;
return TRUE;
}
bool auth_request_import(struct auth_request *request,
const char *key, const char *value)
{
if (auth_request_import_auth(request, key, value))
return TRUE;
/* for communication between auth master and worker processes */
if (strcmp(key, "user") == 0)
request->user = p_strdup(request->pool, value);
else if (strcmp(key, "master-user") == 0)
request->master_user = p_strdup(request->pool, value);
else if (strcmp(key, "original-username") == 0)
request->original_username = p_strdup(request->pool, value);
else if (strcmp(key, "requested-login-user") == 0)
request->requested_login_user = p_strdup(request->pool, value);
else if (strcmp(key, "successful") == 0)
request->successful = TRUE;
else if (strcmp(key, "skip-password-check") == 0)
request->skip_password_check = TRUE;
else if (strcmp(key, "mech") == 0)
request->mech_name = p_strdup(request->pool, value);
else
return FALSE;
return TRUE;
}
void auth_request_initial(struct auth_request *request)
{
i_assert(request->state == AUTH_REQUEST_STATE_NEW);
auth_request_set_state(request, AUTH_REQUEST_STATE_MECH_CONTINUE);
request->mech->auth_initial(request, request->initial_response,
request->initial_response_len);
}
void auth_request_continue(struct auth_request *request,
const unsigned char *data, size_t data_size)
{
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
if (request->successful) {
auth_request_success(request, "", 0);
return;
}
auth_request_refresh_last_access(request);
request->mech->auth_continue(request, data, data_size);
}
static void auth_request_save_cache(struct auth_request *request,
enum passdb_result result)
{
struct auth_passdb *passdb = request->passdb;
const char *encoded_password;
string_t *str;
switch (result) {
case PASSDB_RESULT_USER_UNKNOWN:
case PASSDB_RESULT_PASSWORD_MISMATCH:
case PASSDB_RESULT_OK:
case PASSDB_RESULT_SCHEME_NOT_AVAILABLE:
/* can be cached */
break;
case PASSDB_RESULT_NEXT:
case PASSDB_RESULT_USER_DISABLED:
case PASSDB_RESULT_PASS_EXPIRED:
/* FIXME: we can't cache this now, or cache lookup would
return success. */
return;
case PASSDB_RESULT_INTERNAL_FAILURE:
i_unreached();
}
if (passdb_cache == NULL || passdb->cache_key == NULL)
return;
if (result < 0) {
/* lookup failed. */
if (result == PASSDB_RESULT_USER_UNKNOWN) {
auth_cache_insert(passdb_cache, request,
passdb->cache_key, "", FALSE);
}
return;
}
if (request->passdb_password == NULL &&
!auth_fields_exists(request->extra_fields, "nopassword")) {
/* passdb didn't provide the correct password */
if (result != PASSDB_RESULT_OK ||
request->mech_password == NULL)
return;
/* we can still cache valid password lookups though.
strdup() it so that mech_password doesn't get
cleared too early. */
if (!password_generate_encoded(request->mech_password,
request->user,
CACHED_PASSWORD_SCHEME,
&encoded_password))
i_unreached();
request->passdb_password =
p_strconcat(request->pool, "{"CACHED_PASSWORD_SCHEME"}",
encoded_password, NULL);
}
/* save all except the currently given password in cache */
str = t_str_new(256);
if (request->passdb_password != NULL) {
if (*request->passdb_password != '{') {
/* cached passwords must have a known scheme */
str_append_c(str, '{');
str_append(str, passdb->passdb->default_pass_scheme);
str_append_c(str, '}');
}
str_append_tabescaped(str, request->passdb_password);
}
if (!auth_fields_is_empty(request->extra_fields)) {
str_append_c(str, '\t');
/* add only those extra fields to cache that were set by this
passdb lookup. the CHANGED flag does this, because we
snapshotted the extra_fields before the current passdb
lookup. */
auth_fields_append(request->extra_fields, str,
AUTH_FIELD_FLAG_CHANGED,
AUTH_FIELD_FLAG_CHANGED);
}
auth_cache_insert(passdb_cache, request, passdb->cache_key, str_c(str),
result == PASSDB_RESULT_OK);
}
static void auth_request_master_lookup_finish(struct auth_request *request)
{
if (request->failed)
return;
/* master login successful. update user and master_user variables. */
auth_request_log_info(request, AUTH_SUBSYS_DB,
"Master user logging in as %s",
request->requested_login_user);
request->master_user = request->user;
request->user = request->requested_login_user;
request->requested_login_user = NULL;
}
static bool
auth_request_want_skip_passdb(struct auth_request *request,
struct auth_passdb *passdb)
{
/* skip_password_check basically specifies if authentication is
finished */
bool authenticated = request->skip_password_check;
switch (passdb->skip) {
case AUTH_PASSDB_SKIP_NEVER:
return FALSE;
case AUTH_PASSDB_SKIP_AUTHENTICATED:
return authenticated;
case AUTH_PASSDB_SKIP_UNAUTHENTICATED:
return !authenticated;
}
i_unreached();
}
static bool
auth_request_want_skip_userdb(struct auth_request *request,
struct auth_userdb *userdb)
{
switch (userdb->skip) {
case AUTH_USERDB_SKIP_NEVER:
return FALSE;
case AUTH_USERDB_SKIP_FOUND:
return request->userdb_success;
case AUTH_USERDB_SKIP_NOTFOUND:
return !request->userdb_success;
}
i_unreached();
}
static bool
auth_request_handle_passdb_callback(enum passdb_result *result,
struct auth_request *request)
{
struct auth_passdb *next_passdb;
enum auth_db_rule result_rule;
bool passdb_continue = FALSE;
if (request->passdb_password != NULL) {
safe_memset(request->passdb_password, 0,
strlen(request->passdb_password));
}
if (request->passdb->set->deny &&
*result != PASSDB_RESULT_USER_UNKNOWN) {
/* deny passdb. we can get through this step only if the
lookup returned that user doesn't exist in it. internal
errors are fatal here. */
if (*result != PASSDB_RESULT_INTERNAL_FAILURE) {
auth_request_log_info(request, AUTH_SUBSYS_DB,
"User found from deny passdb");
*result = PASSDB_RESULT_USER_DISABLED;
}
return TRUE;
}
if (request->failed) {
/* The passdb didn't fail, but something inside it failed
(e.g. allow_nets mismatch). Make sure we'll fail this
lookup, but reset the failure so the next passdb can
succeed. */
if (*result == PASSDB_RESULT_OK)
*result = PASSDB_RESULT_USER_UNKNOWN;
request->failed = FALSE;
}
/* users that exist but can't log in are special. we don't try to match
any of the success/failure rules to them. they'll always fail. */
switch (*result) {
case PASSDB_RESULT_USER_DISABLED:
return TRUE;
case PASSDB_RESULT_PASS_EXPIRED:
auth_request_set_field(request, "reason",
"Password expired", NULL);
return TRUE;
case PASSDB_RESULT_OK:
result_rule = request->passdb->result_success;
break;
case PASSDB_RESULT_INTERNAL_FAILURE:
result_rule = request->passdb->result_internalfail;
break;
case PASSDB_RESULT_NEXT:
auth_request_log_debug(request, AUTH_SUBSYS_DB,
"Not performing authentication (noauthenticate set)");
result_rule = AUTH_DB_RULE_CONTINUE;
break;
case PASSDB_RESULT_SCHEME_NOT_AVAILABLE:
case PASSDB_RESULT_USER_UNKNOWN:
case PASSDB_RESULT_PASSWORD_MISMATCH:
default:
result_rule = request->passdb->result_failure;
break;
}
switch (result_rule) {
case AUTH_DB_RULE_RETURN:
break;
case AUTH_DB_RULE_RETURN_OK:
request->passdb_success = TRUE;
break;
case AUTH_DB_RULE_RETURN_FAIL:
request->passdb_success = FALSE;
break;
case AUTH_DB_RULE_CONTINUE:
passdb_continue = TRUE;
if (*result == PASSDB_RESULT_OK) {
/* password was successfully verified. don't bother
checking it again. */
request->skip_password_check = TRUE;
}
break;
case AUTH_DB_RULE_CONTINUE_OK:
passdb_continue = TRUE;
request->passdb_success = TRUE;
/* password was successfully verified. don't bother
checking it again. */
request->skip_password_check = TRUE;
break;
case AUTH_DB_RULE_CONTINUE_FAIL:
passdb_continue = TRUE;
request->passdb_success = FALSE;
break;
}
/* nopassword check is specific to a single passdb and shouldn't leak
to the next one. we already added it to cache. */
auth_fields_remove(request->extra_fields, "nopassword");
auth_fields_remove(request->extra_fields, "noauthenticate");
if (request->requested_login_user != NULL &&
*result == PASSDB_RESULT_OK) {
auth_request_master_lookup_finish(request);
/* if the passdb lookup continues, it continues with non-master
passdbs for the requested_login_user. */
next_passdb = auth_request_get_auth(request)->passdbs;
} else {
next_passdb = request->passdb->next;
}
while (next_passdb != NULL &&
auth_request_want_skip_passdb(request, next_passdb))
next_passdb = next_passdb->next;
if (*result == PASSDB_RESULT_OK || *result == PASSDB_RESULT_NEXT) {
/* this passdb lookup succeeded, preserve its extra fields */
auth_fields_snapshot(request->extra_fields);
request->snapshot_have_userdb_prefetch_set =
request->userdb_prefetch_set;
if (request->userdb_reply != NULL)
auth_fields_snapshot(request->userdb_reply);
} else {
/* this passdb lookup failed, remove any extra fields it set */
auth_fields_rollback(request->extra_fields);
if (request->userdb_reply != NULL) {
auth_fields_rollback(request->userdb_reply);
request->userdb_prefetch_set =
request->snapshot_have_userdb_prefetch_set;
}
}
if (passdb_continue && next_passdb != NULL) {
/* try next passdb. */
request->passdb = next_passdb;
request->passdb_password = NULL;
if (*result == PASSDB_RESULT_USER_UNKNOWN) {
/* remember that we did at least one successful
passdb lookup */
request->passdbs_seen_user_unknown = TRUE;
} else if (*result == PASSDB_RESULT_INTERNAL_FAILURE) {
/* remember that we have had an internal failure. at
the end return internal failure if we couldn't
successfully login. */
request->passdbs_seen_internal_failure = TRUE;
}
return FALSE;
} else if (*result == PASSDB_RESULT_NEXT) {
/* admin forgot to put proper passdb last */
auth_request_log_error(request, AUTH_SUBSYS_DB,
"Last passdb had noauthenticate field, cannot authenticate user");
*result = PASSDB_RESULT_INTERNAL_FAILURE;
} else if (request->passdb_success) {
/* either this or a previous passdb lookup succeeded. */
*result = PASSDB_RESULT_OK;
} else if (request->passdbs_seen_internal_failure) {
/* last passdb lookup returned internal failure. it may have
had the correct password, so return internal failure
instead of plain failure. */
*result = PASSDB_RESULT_INTERNAL_FAILURE;
}
return TRUE;
}
static void
auth_request_verify_plain_callback_finish(enum passdb_result result,
struct auth_request *request)
{
passdb_template_export(request->passdb->override_fields_tmpl, request);
if (!auth_request_handle_passdb_callback(&result, request)) {
/* try next passdb */
auth_request_verify_plain(request, request->mech_password,
request->private_callback.verify_plain);
} else {
auth_request_ref(request);
request->passdb_result = result;
request->private_callback.verify_plain(request->passdb_result, request);
auth_request_unref(&request);
}
}
void auth_request_verify_plain_callback(enum passdb_result result,
struct auth_request *request)
{
struct auth_passdb *passdb = request->passdb;
i_assert(request->state == AUTH_REQUEST_STATE_PASSDB);
auth_request_set_state(request, AUTH_REQUEST_STATE_MECH_CONTINUE);
if (result == PASSDB_RESULT_OK &&
auth_fields_exists(request->extra_fields, "noauthenticate"))
result = PASSDB_RESULT_NEXT;
if (result != PASSDB_RESULT_INTERNAL_FAILURE)
auth_request_save_cache(request, result);
else {
/* lookup failed. if we're looking here only because the
request was expired in cache, fallback to using cached
expired record. */
const char *cache_key = passdb->cache_key;
auth_request_stats_add_tempfail(request);
if (passdb_cache_verify_plain(request, cache_key,
request->mech_password,
&result, TRUE)) {
auth_request_log_info(request, AUTH_SUBSYS_DB,
"Falling back to expired data from cache");
}
}
auth_request_verify_plain_callback_finish(result, request);
}
static bool password_has_illegal_chars(const char *password)
{
for (; *password != '\0'; password++) {
switch (*password) {
case '\001':
case '\t':
case '\r':
case '\n':
/* these characters have a special meaning in internal
protocols, make sure the password doesn't
accidentally get there unescaped. */
return TRUE;
}
}
return FALSE;
}
static bool auth_request_is_disabled_master_user(struct auth_request *request)
{
if (request->passdb != NULL)
return FALSE;
/* no masterdbs, master logins not supported */
i_assert(request->requested_login_user != NULL);
auth_request_log_info(request, AUTH_SUBSYS_MECH,
"Attempted master login with no master passdbs "
"(trying to log in as user: %s)",
request->requested_login_user);
return TRUE;
}
static
void auth_request_policy_penalty_finish(void *context)
{
struct auth_policy_check_ctx *ctx = context;
if (ctx->request->to_penalty != NULL)
timeout_remove(&ctx->request->to_penalty);
i_assert(ctx->request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
switch(ctx->type) {
case AUTH_POLICY_CHECK_TYPE_PLAIN:
auth_request_verify_plain_continue(ctx->request, ctx->callback_plain);
return;
case AUTH_POLICY_CHECK_TYPE_LOOKUP:
auth_request_lookup_credentials_policy_continue(ctx->request, ctx->callback_lookup);
return;
case AUTH_POLICY_CHECK_TYPE_SUCCESS:
auth_request_success_continue(ctx);
return;
default:
i_unreached();
}
}
static
void auth_request_policy_check_callback(int result, void *context)
{
struct auth_policy_check_ctx *ctx = context;
ctx->request->policy_processed = TRUE;
if (result == -1) {
/* fail it right here and now */
auth_request_fail(ctx->request);
} else if (ctx->type != AUTH_POLICY_CHECK_TYPE_SUCCESS && result > 0 && !ctx->request->no_penalty) {
ctx->request->to_penalty = timeout_add(result * 1000,
auth_request_policy_penalty_finish,
context);
} else {
auth_request_policy_penalty_finish(context);
}
}
void auth_request_verify_plain(struct auth_request *request,
const char *password,
verify_plain_callback_t *callback)
{
struct auth_policy_check_ctx *ctx;
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
if (request->mech_password == NULL)
request->mech_password = p_strdup(request->pool, password);
else
i_assert(request->mech_password == password);
if (request->policy_processed) {
auth_request_verify_plain_continue(request, callback);
} else {
ctx = p_new(request->pool, struct auth_policy_check_ctx, 1);
ctx->request = request;
ctx->callback_plain = callback;
ctx->type = AUTH_POLICY_CHECK_TYPE_PLAIN;
auth_policy_check(request, request->mech_password, auth_request_policy_check_callback, ctx);
}
}
static
void auth_request_verify_plain_continue(struct auth_request *request,
verify_plain_callback_t *callback) {
struct auth_passdb *passdb;
enum passdb_result result;
const char *cache_key;
const char *password = request->mech_password;
i_assert(request->state == AUTH_REQUEST_STATE_MECH_CONTINUE);
if (auth_request_is_disabled_master_user(request)) {
callback(PASSDB_RESULT_USER_UNKNOWN, request);
return;
}
if (password_has_illegal_chars(password)) {
auth_request_log_info(request, AUTH_SUBSYS_DB,
"Attempted login with password having illegal chars");
callback(PASSDB_RESULT_USER_UNKNOWN, request);
return;
}
passdb = request->passdb;
request->private_callback.verify_plain = callback;
cache_key = passdb_cache == NULL ? NULL : passdb->cache_key;
if (passdb_cache_verify_plain(request, cache_key, password,
&result, FALSE)) {
auth_request_verify_plain_callback_finish(result, request);
return;
}
auth_request_set_state(request, AUTH_REQUEST_STATE_PASSDB);
request->credentials_scheme = NULL;
if (passdb->passdb->iface.verify_plain == NULL) {
/* we're deinitializing and just want to get rid of this
request */
auth_request_verify_plain_callback(
PASSDB_RESULT_INTERNAL_FAILURE, request);
} else if (passdb->passdb->blocking) {
passdb_blocking_verify_plain(request);
} else {
passdb_template_export(passdb->default_fields_tmpl, request);
passdb->passdb->iface.verify_plain(request, password,
auth_request_verify_plain_callback);
}
}
static void
auth_request_lookup_credentials_finish(enum passdb_result result,
const unsigned char *credentials,
size_t size,
struct auth_request *request)
{
passdb_template_export(request->passdb->override_fields_tmpl, request);
if (!auth_request_handle_passdb_callback(&result, request)) {
/* try next passdb */
if (request->skip_password_check &&
request->delayed_credentials == NULL && size > 0) {
/* passdb continue* rule after a successful lookup.
remember these credentials and use them later on. */
unsigned char *dup;
dup = p_malloc(request->pool, size);
memcpy(dup, credentials, size);
request->delayed_credentials = dup;
request->delayed_credentials_size = size;
}
auth_request_lookup_credentials(request,
request->credentials_scheme,
request->private_callback.lookup_credentials);
} else {
if (request->delayed_credentials != NULL && size == 0) {
/* we did multiple passdb lookups, but the last one
didn't provide any credentials (e.g. just wanted to
add some extra fields). so use the first passdb's
credentials instead. */
credentials = request->delayed_credentials;
size = request->delayed_credentials_size;
}
if (request->set->debug_passwords &&
result == PASSDB_RESULT_OK) {
auth_request_log_debug(request, AUTH_SUBSYS_DB,