/
imap-sieve.c
760 lines (639 loc) · 19.5 KB
/
imap-sieve.c
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/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "home-expand.h"
#include "mail-storage.h"
#include "mail-user.h"
#include "lda-settings.h"
#include "mail-deliver.h"
#include "duplicate.h"
#include "smtp-client.h"
#include "sieve.h"
#include "sieve-script.h"
#include "sieve-storage.h"
#include "ext-imapsieve-common.h"
#include "imap-sieve.h"
/*
* Configuration
*/
#define IMAP_SIEVE_MAX_USER_ERRORS 30
/*
* IMAP Sieve
*/
struct imap_sieve {
pool_t pool;
struct mail_user *user;
const struct lda_settings *lda_set;
const char *home_dir;
struct sieve_instance *svinst;
struct sieve_storage *storage;
const struct sieve_extension *ext_imapsieve;
const struct sieve_extension *ext_vnd_imapsieve;
struct duplicate_context *dup_ctx;
struct sieve_error_handler *master_ehandler;
};
static const char *
mail_sieve_get_setting(void *context, const char *identifier)
{
struct imap_sieve *isieve = (struct imap_sieve *)context;
return mail_user_plugin_getenv(isieve->user, identifier);
}
static const struct sieve_callbacks mail_sieve_callbacks = {
NULL,
mail_sieve_get_setting
};
struct imap_sieve *imap_sieve_init(struct mail_user *user,
const struct lda_settings *lda_set)
{
struct sieve_environment svenv;
struct imap_sieve *isieve;
bool debug = user->mail_debug;
pool_t pool;
pool = pool_alloconly_create("imap_sieve", 256);
isieve = p_new(pool, struct imap_sieve, 1);
isieve->pool = pool;
isieve->user = user;
isieve->lda_set = lda_set;
isieve->dup_ctx = duplicate_init(user);
i_zero(&svenv);
svenv.username = user->username;
(void)mail_user_get_home(user, &svenv.home_dir);
svenv.hostname = lda_set->hostname;
svenv.base_dir = user->set->base_dir;
svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
svenv.location = SIEVE_ENV_LOCATION_MS;
svenv.delivery_phase = SIEVE_DELIVERY_PHASE_POST;
isieve->home_dir = p_strdup(pool, svenv.home_dir);
isieve->svinst = sieve_init
(&svenv, &mail_sieve_callbacks, isieve, debug);
isieve->ext_imapsieve = sieve_extension_replace
(isieve->svinst, &imapsieve_extension, TRUE);
isieve->ext_vnd_imapsieve = sieve_extension_replace
(isieve->svinst, &vnd_imapsieve_extension, TRUE);
isieve->master_ehandler = sieve_master_ehandler_create
(isieve->svinst, NULL, 0); // FIXME: prefix?
sieve_system_ehandler_set(isieve->master_ehandler);
sieve_error_handler_accept_infolog(isieve->master_ehandler, TRUE);
sieve_error_handler_accept_debuglog(isieve->master_ehandler, debug);
return isieve;
}
void imap_sieve_deinit(struct imap_sieve **_isieve)
{
struct imap_sieve *isieve = *_isieve;
*_isieve = NULL;
sieve_error_handler_unref(&isieve->master_ehandler);
if (isieve->storage != NULL)
sieve_storage_unref(&isieve->storage);
sieve_extension_unregister(isieve->ext_imapsieve);
sieve_extension_unregister(isieve->ext_vnd_imapsieve);
sieve_deinit(&isieve->svinst);
duplicate_deinit(&isieve->dup_ctx);
pool_unref(&isieve->pool);
}
static int
imap_sieve_get_storage(struct imap_sieve *isieve,
struct sieve_storage **storage_r)
{
enum sieve_storage_flags storage_flags = 0;
enum sieve_error error;
if (isieve->storage != NULL) {
*storage_r = isieve->storage;
return 1;
}
// FIXME: limit interval between retries
isieve->storage = sieve_storage_create_main
(isieve->svinst, isieve->user, storage_flags, &error);
if (isieve->storage == NULL) {
if (error == SIEVE_ERROR_TEMP_FAILURE)
return -1;
return 0;
}
*storage_r = isieve->storage;
return 1;
}
/*
* Mail transmission
*/
static void *imap_sieve_smtp_start
(const struct sieve_script_env *senv, const char *return_path)
{
struct imap_sieve_context *isctx =
(struct imap_sieve_context *)senv->script_context;
return (void *)smtp_client_init
(isctx->isieve->lda_set, return_path);
}
static void imap_sieve_smtp_add_rcpt
(const struct sieve_script_env *senv ATTR_UNUSED, void *handle,
const char *address)
{
struct smtp_client *smtp_client = (struct smtp_client *) handle;
smtp_client_add_rcpt(smtp_client, address);
}
static struct ostream *imap_sieve_smtp_send
(const struct sieve_script_env *senv ATTR_UNUSED, void *handle)
{
struct smtp_client *smtp_client = (struct smtp_client *) handle;
return smtp_client_send(smtp_client);
}
static void imap_sieve_smtp_abort
(const struct sieve_script_env *senv ATTR_UNUSED, void *handle)
{
struct smtp_client *smtp_client = (struct smtp_client *) handle;
smtp_client_abort(&smtp_client);
}
static int imap_sieve_smtp_finish
(const struct sieve_script_env *senv ATTR_UNUSED, void *handle,
const char **error_r)
{
struct smtp_client *smtp_client = (struct smtp_client *) handle;
return smtp_client_deinit_timeout
(smtp_client, LDA_SUBMISSION_TIMEOUT_SECS, error_r);
}
/*
* Duplicate checking
*/
static bool imap_sieve_duplicate_check
(const struct sieve_script_env *senv, const void *id,
size_t id_size)
{
struct imap_sieve_context *isctx =
(struct imap_sieve_context *)senv->script_context;
return duplicate_check(isctx->isieve->dup_ctx,
id, id_size, senv->user->username);
}
static void imap_sieve_duplicate_mark
(const struct sieve_script_env *senv, const void *id,
size_t id_size, time_t time)
{
struct imap_sieve_context *isctx =
(struct imap_sieve_context *)senv->script_context;
duplicate_mark(isctx->isieve->dup_ctx,
id, id_size, senv->user->username, time);
}
static void imap_sieve_duplicate_flush
(const struct sieve_script_env *senv)
{
struct imap_sieve_context *isctx =
(struct imap_sieve_context *)senv->script_context;
duplicate_flush(isctx->isieve->dup_ctx);
}
/*
* IMAP Sieve run
*/
struct imap_sieve_run_script {
struct sieve_script *script;
struct sieve_binary *binary;
/* Compile failed once with this error;
don't try again for this transaction */
enum sieve_error compile_error;
/* Binary corrupt after recompile; don't recompile again */
unsigned int binary_corrupt:1;
};
struct imap_sieve_run {
pool_t pool;
struct imap_sieve *isieve;
struct mailbox *dest_mailbox, *src_mailbox;
char *cause;
struct sieve_error_handler *user_ehandler;
char *userlog;
struct sieve_script *user_script;
struct imap_sieve_run_script *scripts;
unsigned int scripts_count;
};
static void
imap_sieve_run_init_user_log(struct imap_sieve_run *isrun)
{
struct imap_sieve *isieve = isrun->isieve;
struct sieve_instance *svinst = isieve->svinst;
const char *log_path;
log_path = sieve_user_get_log_path
(svinst, isrun->user_script);
if ( log_path != NULL ) {
isrun->userlog = p_strdup(isrun->pool, log_path);
isrun->user_ehandler = sieve_logfile_ehandler_create
(svinst, log_path, IMAP_SIEVE_MAX_USER_ERRORS);
}
}
int imap_sieve_run_init(struct imap_sieve *isieve,
struct mailbox *dest_mailbox, struct mailbox *src_mailbox,
const char *cause, const char *script_name,
const char *const *scripts_before,
const char *const *scripts_after,
struct imap_sieve_run **isrun_r)
{
struct sieve_instance *svinst = isieve->svinst;
struct imap_sieve_run *isrun;
struct sieve_storage *storage;
struct imap_sieve_run_script *scripts;
struct sieve_script *user_script;
const char *const *sp;
enum sieve_error error;
pool_t pool;
unsigned int max_len, count;
int ret;
/* Determine how many scripts we may run for this event */
max_len = 0;
if (scripts_before != NULL)
max_len += str_array_length(scripts_before);
if (script_name != NULL)
max_len++;
if (scripts_after != NULL)
max_len += str_array_length(scripts_after);
if (max_len == 0)
return 0;
/* Get storage for user script */
storage = NULL;
if (script_name != NULL && *script_name != '\0' &&
(ret=imap_sieve_get_storage(isieve, &storage)) < 0)
return ret;
/* Open all scripts */
count = 0;
pool = pool_alloconly_create("imap_sieve_run", 256);
scripts = p_new(pool, struct imap_sieve_run_script, max_len);
/* Admin scripts before user script */
if (scripts_before != NULL) {
for (sp = scripts_before; *sp != NULL; sp++) {
i_assert(count < max_len);
scripts[count].script = sieve_script_create_open
(svinst, *sp, NULL, &error);
if (scripts[count].script != NULL)
count++;
else if (error == SIEVE_ERROR_TEMP_FAILURE)
return -1;
}
}
/* The user script */
user_script = NULL;
if (storage != NULL) {
i_assert(count < max_len);
scripts[count].script = sieve_storage_open_script
(storage, script_name, &error);
if (scripts[count].script != NULL) {
user_script = scripts[count].script;
count++;
} else if (error == SIEVE_ERROR_TEMP_FAILURE) {
return -1;
}
}
/* Admin scripts after user script */
if (scripts_after != NULL) {
for (sp = scripts_after; *sp != NULL; sp++) {
i_assert(count < max_len);
scripts[count].script = sieve_script_create_open
(svinst, *sp, NULL, &error);
if (scripts[count].script != NULL)
count++;
else if (error == SIEVE_ERROR_TEMP_FAILURE)
return -1;
}
}
if (count == 0) {
/* None of the scripts could be opened */
pool_unref(&pool);
return 0;
}
/* Initialize */
isrun = p_new(pool, struct imap_sieve_run, 1);
isrun->pool = pool;
isrun->isieve = isieve;
isrun->dest_mailbox = dest_mailbox;
isrun->src_mailbox = src_mailbox;
isrun->cause = p_strdup(pool, cause);
isrun->user_script = user_script;
isrun->scripts = scripts;
isrun->scripts_count = count;
imap_sieve_run_init_user_log(isrun);
*isrun_r = isrun;
return 1;
}
void imap_sieve_run_deinit(struct imap_sieve_run **_isrun)
{
struct imap_sieve_run *isrun = *_isrun;
unsigned int i;
*_isrun = NULL;
for (i = 0; i < isrun->scripts_count; i++) {
if (isrun->scripts[i].binary != NULL)
sieve_close(&isrun->scripts[i].binary);
if (isrun->scripts[i].script != NULL)
sieve_script_unref(&isrun->scripts[i].script);
}
if (isrun->user_ehandler != NULL)
sieve_error_handler_unref(&isrun->user_ehandler);
pool_unref(&isrun->pool);
}
static struct sieve_binary *
imap_sieve_run_open_script(
struct imap_sieve_run *isrun,
struct sieve_script *script,
enum sieve_compile_flags cpflags,
bool recompile, enum sieve_error *error_r)
{
struct imap_sieve *isieve = isrun->isieve;
struct sieve_instance *svinst = isieve->svinst;
struct sieve_error_handler *ehandler;
struct sieve_binary *sbin;
const char *compile_name = "compile";
bool debug = isieve->user->mail_debug;
if ( recompile ) {
/* Warn */
sieve_sys_warning(svinst,
"Encountered corrupt binary: re-compiling script %s",
sieve_script_location(script));
compile_name = "re-compile";
} else if ( debug ) {
sieve_sys_debug(svinst,
"Loading script %s", sieve_script_location(script));
}
if ( script == isrun->user_script )
ehandler = isrun->user_ehandler;
else
ehandler = isieve->master_ehandler;
sieve_error_handler_reset(ehandler);
/* Load or compile the sieve script */
if ( recompile ) {
sbin = sieve_compile_script
(script, ehandler, cpflags, error_r);
} else {
sbin = sieve_open_script
(script, ehandler, cpflags, error_r);
}
/* Handle error */
if ( sbin == NULL ) {
switch ( *error_r ) {
/* Script not found */
case SIEVE_ERROR_NOT_FOUND:
if ( debug ) {
sieve_sys_debug(svinst, "Script `%s' is missing for %s",
sieve_script_location(script), compile_name);
}
break;
/* Temporary failure */
case SIEVE_ERROR_TEMP_FAILURE:
sieve_sys_error(svinst,
"Failed to open script `%s' for %s (temporary failure)",
sieve_script_location(script), compile_name);
break;
/* Compile failed */
case SIEVE_ERROR_NOT_VALID:
if (script == isrun->user_script && isrun->userlog != NULL ) {
sieve_sys_info(svinst,
"Failed to %s script `%s' "
"(view user logfile `%s' for more information)",
compile_name, sieve_script_location(script),
isrun->userlog);
break;
}
sieve_sys_error(svinst, "Failed to %s script `%s'",
compile_name, sieve_script_location(script));
break;
/* Something else */
default:
sieve_sys_error(svinst, "Failed to open script `%s' for %s",
sieve_script_location(script), compile_name);
break;
}
return NULL;
}
if (!recompile)
(void)sieve_save(sbin, FALSE, NULL);
return sbin;
}
static int imap_sieve_handle_exec_status
(struct imap_sieve_run *isrun,
struct sieve_script *script, int status, bool keep,
struct sieve_exec_status *estatus)
ATTR_NULL(2)
{
struct imap_sieve *isieve = isrun->isieve;
struct sieve_instance *svinst = isieve->svinst;
const char *userlog_notice = "";
sieve_sys_error_func_t error_func, user_error_func;
enum mail_error mail_error = MAIL_ERROR_NONE;
int ret = -1;
error_func = user_error_func = sieve_sys_error;
if ( estatus != NULL && estatus->last_storage != NULL &&
estatus->store_failed) {
mail_storage_get_last_error(estatus->last_storage, &mail_error);
/* Don't bother administrator too much with benign errors */
if ( mail_error == MAIL_ERROR_NOQUOTA ) {
error_func = sieve_sys_info;
user_error_func = sieve_sys_info;
}
}
if ( script == isrun->user_script && isrun->userlog != NULL ) {
userlog_notice = t_strdup_printf
(" (user logfile %s may reveal additional details)",
isrun->userlog);
user_error_func = sieve_sys_info;
}
switch ( status ) {
case SIEVE_EXEC_FAILURE:
user_error_func(svinst,
"Execution of script %s failed%s",
sieve_script_location(script), userlog_notice);
ret = 0;
break;
case SIEVE_EXEC_TEMP_FAILURE:
error_func(svinst,
"Execution of script %s was aborted "
"due to temporary failure%s",
sieve_script_location(script), userlog_notice);
ret = -1;
break;
case SIEVE_EXEC_BIN_CORRUPT:
sieve_sys_error(svinst,
"!!BUG!!: Binary compiled from %s is still corrupt; "
"bailing out and reverting to default action",
sieve_script_location(script));
ret = 0;
break;
case SIEVE_EXEC_KEEP_FAILED:
error_func(svinst,
"Execution of script %s failed "
"with unsuccessful implicit keep%s",
sieve_script_location(script), userlog_notice);
ret = 0;
break;
case SIEVE_EXEC_OK:
ret = (keep ? 0 : 1);
break;
}
return ret;
}
static int imap_sieve_run_scripts
(struct imap_sieve_run *isrun,
const struct sieve_message_data *msgdata,
const struct sieve_script_env *scriptenv)
{
struct imap_sieve *isieve = isrun->isieve;
struct sieve_instance *svinst = isieve->svinst;
struct imap_sieve_run_script *scripts = isrun->scripts;
unsigned int count = isrun->scripts_count;
struct sieve_multiscript *mscript;
struct sieve_error_handler *ehandler;
struct sieve_script *last_script = NULL;
bool user_script = FALSE, more = TRUE;
bool debug = isieve->user->mail_debug, keep = TRUE;
enum sieve_compile_flags cpflags;
enum sieve_execute_flags exflags;
enum sieve_error compile_error = SIEVE_ERROR_NONE;
unsigned int i;
int ret;
/* Start execution */
mscript = sieve_multiscript_start_execute
(svinst, msgdata, scriptenv);
/* Execute scripts */
for ( i = 0; i < count && more; i++ ) {
struct sieve_script *script = scripts[i].script;
struct sieve_binary *sbin = scripts[i].binary;
cpflags = 0;
exflags = SIEVE_EXECUTE_FLAG_NO_ENVELOPE |
SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
user_script = ( script == isrun->user_script );
last_script = script;
if ( user_script ) {
cpflags |= SIEVE_COMPILE_FLAG_NOGLOBAL;
exflags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
ehandler = isrun->user_ehandler;
} else {
cpflags |= SIEVE_COMPILE_FLAG_NO_ENVELOPE;
ehandler = isieve->master_ehandler;
}
/* Open */
if (sbin == NULL) {
if ( debug ) {
sieve_sys_debug(svinst,
"Opening script %d of %d from `%s'",
i+1, count, sieve_script_location(script));
}
/* Already known to fail */
if (scripts[i].compile_error != SIEVE_ERROR_NONE) {
compile_error = scripts[i].compile_error;
break;
}
/* Try to open/compile binary */
scripts[i].binary = sbin = imap_sieve_run_open_script
(isrun, script, cpflags, FALSE, &compile_error);
if ( sbin == NULL ) {
scripts[i].compile_error = compile_error;
break;
}
}
/* Execute */
if ( debug ) {
sieve_sys_debug(svinst,
"Executing script from `%s'",
sieve_get_source(sbin));
}
more = sieve_multiscript_run(mscript,
sbin, ehandler, ehandler, exflags);
if ( !more ) {
if ( !scripts[i].binary_corrupt &&
sieve_multiscript_status(mscript)
== SIEVE_EXEC_BIN_CORRUPT &&
sieve_is_loaded(sbin) ) {
/* Close corrupt script */
sieve_close(&sbin);
/* Recompile */
scripts[i].binary = sbin = imap_sieve_run_open_script
(isrun, script, cpflags, FALSE, &compile_error);
if ( sbin == NULL ) {
scripts[i].compile_error = compile_error;
break;
}
/* Execute again */
more = sieve_multiscript_run(mscript, sbin,
ehandler, ehandler, exflags);
/* Save new version */
if ( sieve_multiscript_status(mscript)
== SIEVE_EXEC_BIN_CORRUPT )
scripts[i].binary_corrupt = TRUE;
else if ( more )
(void)sieve_save(sbin, FALSE, NULL);
}
}
}
/* Finish execution */
exflags = SIEVE_EXECUTE_FLAG_NO_ENVELOPE |
SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
ehandler = (isrun->user_ehandler != NULL ?
isrun->user_ehandler : isieve->master_ehandler);
if ( compile_error == SIEVE_ERROR_TEMP_FAILURE ) {
ret = sieve_multiscript_tempfail
(&mscript, ehandler, exflags);
} else {
ret = sieve_multiscript_finish
(&mscript, ehandler, exflags, &keep);
}
/* Don't log additional messages about compile failure */
if ( compile_error != SIEVE_ERROR_NONE &&
ret == SIEVE_EXEC_FAILURE ) {
sieve_sys_info(svinst,
"Aborted script execution sequence "
"with successful implicit keep");
return 1;
}
return imap_sieve_handle_exec_status
(isrun, last_script, ret, keep, scriptenv->exec_status);
}
int imap_sieve_run_mail
(struct imap_sieve_run *isrun, struct mail *mail,
const char *changed_flags)
{
struct imap_sieve *isieve = isrun->isieve;
struct sieve_instance *svinst = isieve->svinst;
const struct lda_settings *lda_set = isieve->lda_set;
struct sieve_message_data msgdata;
struct sieve_script_env scriptenv;
struct sieve_exec_status estatus;
struct imap_sieve_context context;
struct sieve_trace_config trace_config;
struct sieve_trace_log *trace_log;
int ret;
i_zero(&context);
context.event.dest_mailbox = isrun->dest_mailbox;
context.event.src_mailbox = isrun->src_mailbox;
context.event.cause = isrun->cause;
context.event.changed_flags = changed_flags;
context.isieve = isieve;
/* Initialize trace logging */
trace_log = NULL;
if ( sieve_trace_config_get(svinst, &trace_config) >= 0) {
const char *tr_label = t_strdup_printf
("%s.%s.%u", isieve->user->username,
mailbox_get_vname(mail->box), mail->uid);
if ( sieve_trace_log_open(svinst, tr_label, &trace_log) < 0 )
i_zero(&trace_config);
}
T_BEGIN {
/* Collect necessary message data */
i_zero(&msgdata);
msgdata.mail = mail;
msgdata.auth_user = isieve->user->username;
(void)mail_get_first_header
(msgdata.mail, "Message-ID", &msgdata.id);
/* Compose script execution environment */
i_zero(&scriptenv);
i_zero(&estatus);
scriptenv.default_mailbox = mailbox_get_vname(mail->box);
scriptenv.user = isieve->user;
scriptenv.postmaster_address = lda_set->postmaster_address;
scriptenv.smtp_start = imap_sieve_smtp_start;
scriptenv.smtp_add_rcpt = imap_sieve_smtp_add_rcpt;
scriptenv.smtp_send = imap_sieve_smtp_send;
scriptenv.smtp_abort = imap_sieve_smtp_abort;
scriptenv.smtp_finish = imap_sieve_smtp_finish;
scriptenv.duplicate_mark = imap_sieve_duplicate_mark;
scriptenv.duplicate_check = imap_sieve_duplicate_check;
scriptenv.duplicate_flush = imap_sieve_duplicate_flush;
scriptenv.exec_status = &estatus;
scriptenv.trace_log = trace_log;
scriptenv.trace_config = trace_config;
scriptenv.script_context = (void *)&context;
/* Execute script(s) */
ret = imap_sieve_run_scripts(isrun, &msgdata, &scriptenv);
} T_END;
if ( trace_log != NULL )
sieve_trace_log_free(&trace_log);
return ret;
}