/src/pigeonhole/src/lib-sieve/sieve-actions.c

Source
/* Copyright (c) Pigeonhole authors, see top-level COPYING file */

#include "lib.h"
#include "str.h"
#include "strfuncs.h"
#include "ioloop.h"
#include "hostpid.h"
#include "str-sanitize.h"
#include "unichar.h"
#include "istream.h"
#include "istream-header-filter.h"
#include "ostream.h"
#include "smtp-params.h"
#include "mail-storage.h"
#include "message-date.h"
#include "message-size.h"

#include "rfc2822.h"

#include "sieve-code.h"
#include "sieve-extensions.h"
#include "sieve-binary.h"
#include "sieve-interpreter.h"
#include "sieve-dump.h"
#include "sieve-result.h"
#include "sieve-actions.h"
#include "sieve-message.h"
#include "sieve-smtp.h"

/*
 * Action execution environment
 */

struct event_passthrough *
sieve_action_create_finish_event(const struct sieve_action_exec_env *aenv)
{
  struct event_passthrough *e =
    event_create_passthrough(aenv->event)->
    set_name("sieve_action_finished");

  return e;
}

/*
 * Action instance
 */

bool sieve_action_is_executed(const struct sieve_action *act,
            struct sieve_result *result)
{
  unsigned int cur_exec_seq = sieve_result_get_exec_seq(result);

  i_assert(act->exec_seq <= cur_exec_seq);
  return (act->exec_seq < cur_exec_seq);
}

/*
 * Side-effect operand
 */

const struct sieve_operand_class
sieve_side_effect_operand_class = { "SIDE-EFFECT" };

bool sieve_opr_side_effect_dump(const struct sieve_dumptime_env *denv,
        sieve_size_t *address)
{
  struct sieve_side_effect seffect;
  const struct sieve_side_effect_def *sdef;

  if (!sieve_opr_object_dump(denv, &sieve_side_effect_operand_class,
           address, &seffect.object))
    return FALSE;

  sdef = seffect.def =
    (const struct sieve_side_effect_def *)seffect.object.def;

  if (sdef->dump_context != NULL) {
    sieve_code_descend(denv);
    if (!sdef->dump_context(&seffect, denv, address))
      return FALSE;
    sieve_code_ascend(denv);
  }
  return TRUE;
}

int sieve_opr_side_effect_read(const struct sieve_runtime_env *renv,
             sieve_size_t *address,
             struct sieve_side_effect *seffect)
{
  const struct sieve_side_effect_def *sdef;
  int ret;

  seffect->context = NULL;

  if (!sieve_opr_object_read(renv, &sieve_side_effect_operand_class,
           address, &seffect->object))
    return SIEVE_EXEC_BIN_CORRUPT;

  sdef = seffect->def =
    (const struct sieve_side_effect_def *)seffect->object.def;

  if (sdef->read_context != NULL &&
      (ret = sdef->read_context(seffect, renv, address,
              &seffect->context)) <= 0)
    return ret;
  return SIEVE_EXEC_OK;
}

/*
 * Optional operands
 */

int sieve_action_opr_optional_dump(const struct sieve_dumptime_env *denv,
           sieve_size_t *address, signed int *opt_code)
{
  signed int _opt_code = 0;
  bool final = FALSE, opok = TRUE;

  if (opt_code == NULL) {
    opt_code = &_opt_code;
    final = TRUE;
  }

  while (opok) {
    int opt;

    opt = sieve_opr_optional_dump(denv, address, opt_code);
    if (opt <= 0)
      return opt;

    if (*opt_code == SIEVE_OPT_SIDE_EFFECT)
      opok = sieve_opr_side_effect_dump(denv, address);
    else
      return (final ? -1 : 1);
  }

  return -1;
}

int sieve_action_opr_optional_read(const struct sieve_runtime_env *renv,
           sieve_size_t *address,
           signed int *opt_code, int *exec_status,
           struct sieve_side_effects_list **list)
{
  signed int _opt_code = 0;
  bool final = FALSE;
  int ret;

  if (opt_code == NULL) {
    opt_code = &_opt_code;
    final = TRUE;
  }

  if (exec_status != NULL)
    *exec_status = SIEVE_EXEC_OK;

  for (;;) {
    int opt;

    opt = sieve_opr_optional_read(renv, address, opt_code);
    if (opt <= 0) {
      if (opt < 0 && exec_status != NULL)
        *exec_status = SIEVE_EXEC_BIN_CORRUPT;
      return opt;
    }

    if (*opt_code == SIEVE_OPT_SIDE_EFFECT) {
      struct sieve_side_effect seffect;

      i_assert(list != NULL);

      ret = sieve_opr_side_effect_read(renv, address,
               &seffect);
      if (ret <= 0) {
        if (exec_status != NULL)
          *exec_status = ret;
        return -1;
      }

      if (*list == NULL) {
        *list = sieve_side_effects_list_create(
          renv->result);
      }

      sieve_side_effects_list_add(*list, &seffect);
    } else {
      if (final) {
        sieve_runtime_trace_error(
          renv, "invalid optional operand");
        if (exec_status != NULL)
          *exec_status = SIEVE_EXEC_BIN_CORRUPT;
        return -1;
      }
      return 1;
    }
  }

  i_unreached();
}

/*
 * Store action
 */

/* Forward declarations */

static bool
act_store_equals(const struct sieve_script_env *senv,
     const struct sieve_action *act1,
     const struct sieve_action *act2);

static int
act_store_check_duplicate(const struct sieve_runtime_env *renv,
        const struct sieve_action *act,
        const struct sieve_action *act_other);
static void
act_store_print(const struct sieve_action *action,
    const struct sieve_result_print_env *rpenv, bool *keep);

static int
act_store_start(const struct sieve_action_exec_env *aenv, void **tr_context);
static int
act_store_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
      bool *keep);
static int
act_store_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
static void
act_store_rollback(const struct sieve_action_exec_env *aenv, void *tr_context,
       bool success);

/* Action object */

const struct sieve_action_def act_store = {
  .name = "store",
  .flags =
    SIEVE_ACTFLAG_TRIES_DELIVER |
    SIEVE_ACTFLAG_MAIL_STORAGE,
  .equals = act_store_equals,
  .check_duplicate = act_store_check_duplicate,
  .print = act_store_print,
  .start = act_store_start,
  .execute = act_store_execute,
  .commit = act_store_commit,
  .rollback = act_store_rollback,
};

/* API */

int sieve_act_store_add_to_result(const struct sieve_runtime_env *renv,
          const char *name,
          struct sieve_side_effects_list *seffects,
          const char *mailbox)
{
  pool_t pool;
  struct act_store_context *act;

  /* Add redirect action to the result */
  pool = sieve_result_pool(renv->result);
  act = p_new(pool, struct act_store_context, 1);
  act->mailbox = p_strdup(pool, mailbox);

  return sieve_result_add_action(renv, NULL, name, &act_store, seffects,
               act, 0, TRUE);
}

void sieve_act_store_add_flags(const struct sieve_action_exec_env *aenv,
             void *tr_context, const char *const *keywords,
             enum mail_flags flags)
{
  struct act_store_transaction *trans =
    (struct act_store_transaction *)tr_context;

  i_assert(trans != NULL);

  /* Assign mail keywords for subsequent mailbox_copy() */
  if (*keywords != NULL) {
    const char *const *kw;

    if (!array_is_created(&trans->keywords)) {
      pool_t pool = sieve_result_pool(aenv->result);
      p_array_init(&trans->keywords, pool, 2);
    }

    kw = keywords;
    while (*kw != NULL) {
      array_append(&trans->keywords, kw, 1);
      kw++;
    }
  }

  /* Assign mail flags for subsequent mailbox_copy() */
  trans->flags |= flags;

  trans->flags_altered = TRUE;
}

/* Equality */

static bool
act_store_equals(const struct sieve_script_env *senv,
     const struct sieve_action *act1,
     const struct sieve_action *act2)
{
  struct act_store_context *st_ctx1 =
    (act1 == NULL ?
     NULL : (struct act_store_context *)act1->context);
  struct act_store_context *st_ctx2 =
    (act2 == NULL ?
     NULL : (struct act_store_context *)act2->context);
  const char *mailbox1, *mailbox2;

  /* FIXME: consider namespace aliases */

  if (st_ctx1 == NULL && st_ctx2 == NULL)
    return TRUE;

  mailbox1 = (st_ctx1 == NULL ?
        SIEVE_SCRIPT_DEFAULT_MAILBOX(senv) : st_ctx1->mailbox);
  mailbox2 = (st_ctx2 == NULL ?
        SIEVE_SCRIPT_DEFAULT_MAILBOX(senv) : st_ctx2->mailbox);

  if (strcmp(mailbox1, mailbox2) == 0)
    return TRUE;

  return (strcasecmp(mailbox1, "INBOX") == 0 &&
    strcasecmp(mailbox2, "INBOX") == 0);
}

/* Result verification */

static int
act_store_check_duplicate(const struct sieve_runtime_env *renv,
        const struct sieve_action *act,
        const struct sieve_action *act_other)
{
  const struct sieve_execute_env *eenv = renv->exec_env;

  return (act_store_equals(eenv->scriptenv, act, act_other) ? 1 : 0);
}

/* Result printing */

static void
act_store_print(const struct sieve_action *action,
    const struct sieve_result_print_env *rpenv, bool *keep)
{
  struct act_store_context *ctx =
    (struct act_store_context *)action->context;
  const char *mailbox;

  mailbox = (ctx == NULL ?
       SIEVE_SCRIPT_DEFAULT_MAILBOX(rpenv->scriptenv) :
      ctx->mailbox);

  sieve_result_action_printf(rpenv, "store message in folder: %s",
           str_sanitize(mailbox, 128));

  *keep = FALSE;
}

/* Action implementation */

void sieve_act_store_get_storage_error(const struct sieve_action_exec_env *aenv,
               struct act_store_transaction *trans)
{
  pool_t pool = sieve_result_pool(aenv->result);

  trans->error = p_strdup(pool,
    mailbox_get_last_internal_error(trans->box,
            &trans->error_code));
}

static bool
act_store_mailbox_alloc(const struct sieve_action_exec_env *aenv,
            const char *mailbox, struct mailbox **box_r,
      enum mail_error *error_code_r, const char **error_r)
{
  const struct sieve_execute_env *eenv = aenv->exec_env;
  struct mailbox *box;
  struct mail_storage **storage = &(eenv->exec_status->last_storage);
  enum mailbox_flags flags = MAILBOX_FLAG_POST_SESSION;

  *box_r = NULL;
  *error_code_r = MAIL_ERROR_NONE;
  *error_r = NULL;

  if (!uni_utf8_str_is_valid(mailbox)) {
    /* Just a precaution; already (supposed to be) checked at
       compiletime/runtime.
     */
    *error_r = t_strdup_printf("mailbox name not utf-8: %s",
             mailbox);
    *error_code_r = MAIL_ERROR_PARAMS;
    return FALSE;
  }

  if (eenv->scriptenv->mailbox_autocreate)
    flags |= MAILBOX_FLAG_AUTO_CREATE;
  if (eenv->scriptenv->mailbox_autosubscribe)
    flags |= MAILBOX_FLAG_AUTO_SUBSCRIBE;
  *box_r = box = mailbox_alloc_for_user(eenv->scriptenv->user, mailbox,
                flags);
  *storage = mailbox_get_storage(box);

  return TRUE;
}

static int
act_store_start(const struct sieve_action_exec_env *aenv, void **tr_context)
{
  const struct sieve_action *action = aenv->action;
  struct act_store_context *ctx =
    (struct act_store_context *)action->context;
  const struct sieve_execute_env *eenv = aenv->exec_env;
  const struct sieve_script_env *senv = eenv->scriptenv;
  struct act_store_transaction *trans;
  struct mailbox *box = NULL;
  pool_t pool = sieve_result_pool(aenv->result);
  const char *error = NULL;
  enum mail_error error_code = MAIL_ERROR_NONE;
  bool disabled = FALSE, alloc_failed = FALSE;

  /* If context is NULL, the store action is the result of (implicit)
     keep.
   */
  if (ctx == NULL) {
    ctx = p_new(pool, struct act_store_context, 1);
    ctx->mailbox =
      p_strdup(pool, SIEVE_SCRIPT_DEFAULT_MAILBOX(senv));
  }

  e_debug(aenv->event, "Start storing into mailbox %s", ctx->mailbox);

  /* Open the requested mailbox */

  /* NOTE: The caller of the sieve library is allowed to leave user set
     to NULL. This implementation will then skip actually storing the
     message.
   */
  if (senv->user != NULL) {
    if (!act_store_mailbox_alloc(aenv, ctx->mailbox, &box,
               &error_code, &error))
      alloc_failed = TRUE;
  } else {
    disabled = TRUE;
  }

  /* Create transaction context */
  trans = p_new(pool, struct act_store_transaction, 1);

  trans->context = ctx;
  trans->box = box;
  trans->flags = 0;

  trans->mailbox_name = ctx->mailbox;
  trans->mailbox_identifier =
    p_strdup_printf(pool, "'%s'", str_sanitize(ctx->mailbox, 256));

  trans->disabled = disabled;

  if (alloc_failed) {
    trans->error = p_strdup(pool, error);
    trans->error_code = error_code;
    e_debug(aenv->event, "Failed to open mailbox %s: %s",
      trans->mailbox_identifier, trans->error);
  } else {
    trans->error_code = MAIL_ERROR_NONE;
  }

  *tr_context = trans;

  switch (trans->error_code) {
  case MAIL_ERROR_NONE:
  case MAIL_ERROR_NOTFOUND:
    return SIEVE_EXEC_OK;
  case MAIL_ERROR_TEMP:
    return SIEVE_EXEC_TEMP_FAILURE;
  default:
    break;
  }
  return SIEVE_EXEC_FAILURE;
}

static struct mail_keywords *
act_store_keywords_create(const struct sieve_action_exec_env *aenv,
        ARRAY_TYPE(const_string) *keywords,
        struct mailbox *box, bool create_empty)
{
  struct mail_keywords *box_keywords = NULL;
  const char *const *kwds = NULL;

  if (!array_is_created(keywords) || array_count(keywords) == 0) {
    if (!create_empty)
      return NULL;
  } else {
    ARRAY_TYPE(const_string) valid_keywords;
    const char *error;
    unsigned int count, i;

    kwds = array_get(keywords, &count);
    t_array_init(&valid_keywords, count);

    for (i = 0; i < count; i++) {
      if (mailbox_keyword_is_valid(box, kwds[i], &error)) {
        array_append(&valid_keywords, &kwds[i], 1);
        continue;
      }

      sieve_result_warning(aenv,
        "specified IMAP keyword '%s' is invalid "
        "(ignored): %s",  str_sanitize(kwds[i], 64),
        sieve_error_from_external(error));
    }

    array_append_zero(keywords);
    kwds = array_idx(keywords, 0);
  }

  if (mailbox_keywords_create(box, kwds, &box_keywords) < 0) {
    sieve_result_error(
      aenv, "invalid keywords set for stored message");
    return NULL;
  }

  return box_keywords;
}

static bool have_equal_keywords(struct mail *mail, struct mail_keywords *new_kw)
{
  const ARRAY_TYPE(keyword_indexes) *old_kw_arr =
    mail_get_keyword_indexes(mail);
  const unsigned int *old_kw;
  unsigned int i, j;

  if (array_count(old_kw_arr) != new_kw->count)
    return FALSE;
  if (new_kw->count == 0)
    return TRUE;

  old_kw = array_front(old_kw_arr);
  for (i = 0; i < new_kw->count; i++) {
    /* new_kw->count equals old_kw's count and it's easier to use */
    for (j = 0; j < new_kw->count; j++) {
      if (old_kw[j] == new_kw->idx[i])
        break;
    }
    if (j == new_kw->count)
      return FALSE;
  }
  return TRUE;
}

static int
act_store_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
      bool *keep)
{
  const struct sieve_action *action = aenv->action;
  const struct sieve_execute_env *eenv = aenv->exec_env;
  struct act_store_transaction *trans =
    (struct act_store_transaction *)tr_context;
  struct mail *mail = (action->mail != NULL ?
           action->mail : eenv->msgdata->mail);
  struct mail_save_context *save_ctx;
  struct mail_keywords *keywords = NULL;
  struct mailbox *box;
  bool backends_equal = FALSE;
  int status = SIEVE_EXEC_OK;

  /* Verify transaction */
  if (trans == NULL)
    return SIEVE_EXEC_FAILURE;
  box = trans->box;

  /* Check whether we need to do anything */
  if (trans->disabled) {
    e_debug(aenv->event, "Skip storing into mailbox %s",
      trans->mailbox_identifier);
    *keep = FALSE;
    return SIEVE_EXEC_OK;
  }

  /* Exit early if mailbox is not available */
  if (box == NULL)
    return SIEVE_EXEC_FAILURE;

  e_debug(aenv->event, "Execute storing into mailbox %s",
    trans->mailbox_identifier);

  /* Mark attempt to use storage. Can only get here when all previous
     actions succeeded.
   */
  eenv->exec_status->last_storage = mailbox_get_storage(box);

  /* Open the mailbox (may already be open) */
  if (trans->error_code == MAIL_ERROR_NONE) {
    if (mailbox_open(box) < 0) {
      sieve_act_store_get_storage_error(aenv, trans);
      e_debug(aenv->event, "Failed to open mailbox %s: %s",
        trans->mailbox_identifier, trans->error);
    }
  }

  /* Exit early if transaction already failed */
  switch (trans->error_code) {
  case MAIL_ERROR_NONE:
    break;
  case MAIL_ERROR_TEMP:
    return SIEVE_EXEC_TEMP_FAILURE;
  default:
    return SIEVE_EXEC_FAILURE;
  }

  /* If the message originates from the target mailbox, only update the
     flags and keywords (if not read-only)
   */
  if (mailbox_backends_equal(box, mail->box)) {
    backends_equal = TRUE;
  } else {
    struct mail *real_mail;

    if (mail_get_backend_mail(mail, &real_mail) < 0)
      return SIEVE_EXEC_FAILURE;
    if (real_mail != mail &&
        mailbox_backends_equal(box, real_mail->box))
      backends_equal = TRUE;
  }
  if (backends_equal) {
    trans->redundant = TRUE;

    if (trans->flags_altered && !mailbox_is_readonly(mail->box)) {
      keywords = act_store_keywords_create(
        aenv, &trans->keywords, mail->box, TRUE);

      if (keywords != NULL) {
        if (!have_equal_keywords(mail, keywords)) {
          eenv->exec_status->significant_action_executed = TRUE;
          mail_update_keywords(mail, MODIFY_REPLACE, keywords);
        }
        mailbox_keywords_unref(&keywords);
      }

      if ((mail_get_flags(mail) & MAIL_FLAGS_NONRECENT) != trans->flags) {
        eenv->exec_status->significant_action_executed = TRUE;
        mail_update_flags(mail, MODIFY_REPLACE, trans->flags);
      }
    }
    e_debug(aenv->event, "Updated existing mail in mailbox %s",
      trans->mailbox_identifier);
    return SIEVE_EXEC_OK;

  /* If the message is modified, only store it in the source mailbox when
     it is not opened read-only. Mail structs of modified messages have
     their own mailbox, unrelated to the orignal mail, so this case needs
     to be handled separately.
   */
  } else if (mail != eenv->msgdata->mail &&
       mailbox_is_readonly(eenv->msgdata->mail->box) &&
       (mailbox_backends_equal(box, eenv->msgdata->mail->box))) {
    e_debug(aenv->event,
      "Not modifying exsiting mail in read-only mailbox %s",
      trans->mailbox_identifier);
    trans->redundant = TRUE;
    return SIEVE_EXEC_OK;
  }

  /* Mark attempt to store in default mailbox */
  if (strcmp(trans->context->mailbox,
       SIEVE_SCRIPT_DEFAULT_MAILBOX(eenv->scriptenv)) == 0)
    eenv->exec_status->tried_default_save = TRUE;

  /* Start mail transaction */
  trans->mail_trans = mailbox_transaction_begin(
    box, MAILBOX_TRANSACTION_FLAG_EXTERNAL, __func__);

  /* Store the message */
  save_ctx = mailbox_save_alloc(trans->mail_trans);

  /* Apply keywords and flags that side-effects may have added */
  if (trans->flags_altered) {
    keywords = act_store_keywords_create(aenv, &trans->keywords,
                 box, FALSE);

    if (trans->flags != 0 || keywords != NULL) {
      eenv->exec_status->significant_action_executed = TRUE;
      mailbox_save_set_flags(save_ctx, trans->flags, keywords);
    }
  } else {
    mailbox_save_copy_flags(save_ctx, mail);
  }

  if (mailbox_save_using_mail(&save_ctx, mail) < 0) {
    sieve_act_store_get_storage_error(aenv, trans);
    e_debug(aenv->event, "Failed to save to mailbox %s: %s",
      trans->mailbox_identifier, trans->error);

    status = (trans->error_code == MAIL_ERROR_TEMP ?
        SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
  } else {
    e_debug(aenv->event, "Saving to mailbox %s successful so far",
      trans->mailbox_identifier);
    eenv->exec_status->significant_action_executed = TRUE;
  }

  /* Deallocate keywords */
  if (keywords != NULL)
    mailbox_keywords_unref(&keywords);

  /* Cancel implicit keep if all went well so far */
  *keep = (status < SIEVE_EXEC_OK);

  return status;
}

static void
act_store_log_status(struct act_store_transaction *trans,
         const struct sieve_action_exec_env *aenv,
         bool rolled_back, bool status)
{
  const char *mailbox_name = trans->mailbox_name;
  const char *mailbox_identifier = trans->mailbox_identifier;

  if (trans->box != NULL) {
    const char *mailbox_vname = str_sanitize(mailbox_get_vname(trans->box), 128);

    if (strcmp(trans->mailbox_name, mailbox_vname) != 0) {
      mailbox_identifier = t_strdup_printf(
        "%s (%s)", mailbox_identifier,
        str_sanitize(mailbox_vname, 256));
    }
  }

  /* Store disabled? */
  if (trans->disabled) {
    sieve_result_global_log(aenv, "store into mailbox %s skipped",
          mailbox_identifier);
  /* Store redundant? */
  } else if (trans->redundant) {
    sieve_result_global_log(aenv, "left message in mailbox %s",
          mailbox_identifier);
  /* Store failed? */
  } else if (!status) {
    const char *errstr;
    enum mail_error error_code;

    if (trans->error == NULL)
      sieve_act_store_get_storage_error(aenv, trans);

    errstr = trans->error;
    error_code = trans->error_code;

    if (error_code == MAIL_ERROR_NOQUOTA) {
      /* Never log quota problems as error in global log */
      sieve_result_global_log_error(
        aenv, "failed to store into mailbox %s: %s",
        mailbox_identifier, errstr);
    } else if (error_code == MAIL_ERROR_NOTFOUND ||
         error_code == MAIL_ERROR_PARAMS ||
         error_code == MAIL_ERROR_PERM) {
      sieve_result_error(
        aenv, "failed to store into mailbox %s: %s",
        mailbox_identifier, errstr);
    } else {
      sieve_result_global_error(
        aenv, "failed to store into mailbox %s: %s",
        mailbox_identifier, errstr);
    }
  /* Store aborted? */
  } else if (rolled_back) {
    if (!aenv->action->keep) {
      sieve_result_global_log(
        aenv, "store into mailbox %s aborted",
        mailbox_identifier);
    } else {
      e_debug(aenv->event, "Store into mailbox %s aborted",
        mailbox_identifier);
    }
  /* Succeeded */
  } else {
    struct event_passthrough *e =
      sieve_action_create_finish_event(aenv)->
      add_str("fileinto_mailbox_name", mailbox_name)->
      add_str("fileinto_mailbox", mailbox_identifier);
    sieve_result_event_log(aenv, e->event(),
               "stored mail into mailbox %s",
               mailbox_identifier);
  }
}

static void act_store_cleanup(struct act_store_transaction *trans)
{
  if (trans->mail_trans != NULL)
    mailbox_transaction_rollback(&trans->mail_trans);
  if (trans->box != NULL)
    mailbox_free(&trans->box);
}

static int
act_store_commit(const struct sieve_action_exec_env *aenv, void *tr_context)
{
  const struct sieve_execute_env *eenv = aenv->exec_env;
  struct act_store_transaction *trans =
    (struct act_store_transaction *)tr_context;
  bool bail_out = FALSE, status = TRUE;
  int ret = SIEVE_EXEC_OK;

  /* Verify transaction */
  if (trans == NULL)
    return SIEVE_EXEC_FAILURE;

  e_debug(aenv->event, "Commit storing into mailbox %s",
    trans->mailbox_identifier);

  /* Check whether we can commit this transaction */
  if (trans->error_code != MAIL_ERROR_NONE) {
    /* Transaction already failed */
    bail_out = TRUE;
    status = FALSE;
    if (trans->error_code == MAIL_ERROR_TEMP)
      ret = SIEVE_EXEC_TEMP_FAILURE;
    else
      ret = SIEVE_EXEC_FAILURE;
  /* Check whether we need to do anything */
  } else if (trans->disabled) {
    /* Nothing to do */
    bail_out = TRUE;
  } else if (trans->redundant) {
    /* This transaction is redundant */
    bail_out = TRUE;
    eenv->exec_status->keep_original = TRUE;
    eenv->exec_status->message_saved = TRUE;
  }
  if (bail_out) {
    act_store_log_status(trans, aenv, FALSE, status);
    act_store_cleanup(trans);
    return ret;
  }

  i_assert(trans->box != NULL);
  i_assert(trans->mail_trans != NULL);

  /* Mark attempt to use storage. Can only get here when all previous
     actions succeeded.
   */
  eenv->exec_status->last_storage = mailbox_get_storage(trans->box);

  /* Commit mailbox transaction */
  status = (mailbox_transaction_commit(&trans->mail_trans) == 0);

  /* Note the fact that the message was stored at least once */
  if (status)
    eenv->exec_status->message_saved = TRUE;
  else
    eenv->exec_status->store_failed = TRUE;

  /* Log our status */
  act_store_log_status(trans, aenv, FALSE, status);

  /* Clean up */
  act_store_cleanup(trans);

  if (status)
    return SIEVE_EXEC_OK;

  return (trans->error_code == MAIL_ERROR_TEMP ?
    SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
}

static void
act_store_rollback(const struct sieve_action_exec_env *aenv, void *tr_context,
       bool success)
{
  const struct sieve_execute_env *eenv = aenv->exec_env;
  struct act_store_transaction *trans =
    (struct act_store_transaction *)tr_context;

  if (trans == NULL)
    return;

  e_debug(aenv->event, "Roll back storing into mailbox %s",
    trans->mailbox_identifier);

  i_assert(trans->box != NULL);

  if (!success) {
    eenv->exec_status->last_storage =
      mailbox_get_storage(trans->box);
    eenv->exec_status->store_failed = TRUE;
  }

  /* Log status */
  act_store_log_status(trans, aenv, TRUE, success);

  /* Rollback mailbox transaction and clean up */
  act_store_cleanup(trans);
}

/*
 * Redirect action
 */

int sieve_act_redirect_add_to_result(const struct sieve_runtime_env *renv,
             const char *name,
             struct sieve_side_effects_list *seffects,
             const struct smtp_address *to_address)
{
  const struct sieve_execute_env *eenv = renv->exec_env;
  struct sieve_instance *svinst = eenv->svinst;
  struct act_redirect_context *act;
  pool_t pool;

  pool = sieve_result_pool(renv->result);
  act = p_new(pool, struct act_redirect_context, 1);
  act->to_address = smtp_address_clone(pool, to_address);

  if (sieve_result_add_action(renv, NULL, name, &act_redirect, seffects,
            act, svinst->set->max_redirects,
            TRUE) < 0)
    return SIEVE_EXEC_FAILURE;

  return SIEVE_EXEC_OK;
}

/*
 * Action utility functions
 */

/* Rejecting the mail */

static int
sieve_action_do_reject_mail(const struct sieve_action_exec_env *aenv,
          const struct smtp_address *recipient,
          const char *reason)
{
  const struct sieve_execute_env *eenv = aenv->exec_env;
  struct sieve_instance *svinst = eenv->svinst;
  const struct sieve_script_env *senv = eenv->scriptenv;
  const struct sieve_message_data *msgdata = eenv->msgdata;
  const struct smtp_address *sender, *orig_recipient;
  struct istream *input;
  struct ostream *output;
  struct sieve_smtp_context *sctx;
  const char *new_msgid, *boundary, *error;
  string_t *hdr;
  int ret;

  sender = sieve_message_get_sender(aenv->msgctx);
  orig_recipient = msgdata->envelope.rcpt_params->orcpt.addr;

  sctx = sieve_smtp_start_single(senv, sender, NULL, &output);

  /* Just to be sure */
  if (sctx == NULL) {
    sieve_result_global_warning(
      aenv, "reject action has no means to send mail");
    return SIEVE_EXEC_OK;
  }

  new_msgid = sieve_message_get_new_id(svinst);
  boundary = t_strdup_printf("%s/%s", my_pid, svinst->hostname);

  hdr = t_str_new(512);
  rfc2822_header_write(hdr, "X-Sieve", SIEVE_IMPLEMENTATION);
  rfc2822_header_write(hdr, "Message-ID", new_msgid);
  rfc2822_header_write(hdr, "Date", message_date_create(ioloop_time));
  rfc2822_header_write(hdr, "From", sieve_get_postmaster_address(senv));
  rfc2822_header_printf(hdr, "To", "<%s>", smtp_address_encode(sender));
  rfc2822_header_write(hdr, "Subject", "Automatically rejected mail");
  rfc2822_header_write(hdr, "Auto-Submitted", "auto-replied (rejected)");
  rfc2822_header_write(hdr, "Precedence", "bulk");

  rfc2822_header_write(hdr, "MIME-Version", "1.0");
  rfc2822_header_printf(hdr, "Content-Type",
            "multipart/report; "
            "report-type=disposition-notification;\r\n"
            "boundary=\"%s\"", boundary);

  str_append(hdr, "\r\nThis is a MIME-encapsulated message\r\n\r\n");

  /* Human readable status report */
  str_printfa(hdr, "--%s\r\n", boundary);
  rfc2822_header_write(hdr, "Content-Type", "text/plain; charset=utf-8");
  rfc2822_header_write(hdr, "Content-Disposition", "inline");
  rfc2822_header_write(hdr, "Content-Transfer-Encoding", "8bit");

  str_printfa(hdr, "\r\nYour message to <%s> was automatically rejected:\r\n"
        "%s\r\n", smtp_address_encode(recipient), reason);

  /* MDN status report */
  str_printfa(hdr, "--%s\r\n", boundary);
  rfc2822_header_write(hdr, "Content-Type",
           "message/disposition-notification");
  str_append(hdr, "\r\n");
  rfc2822_header_write(hdr,
           "Reporting-UA: %s; Dovecot Mail Delivery Agent",
           svinst->hostname);
  if (orig_recipient != NULL) {
    rfc2822_header_printf(hdr, "Original-Recipient", "rfc822; %s",
              smtp_address_encode(orig_recipient));
  }
  rfc2822_header_printf(hdr, "Final-Recipient", "rfc822; %s",
            smtp_address_encode(recipient));

  if (msgdata->id != NULL)
    rfc2822_header_write(hdr, "Original-Message-ID", msgdata->id);
  rfc2822_header_write(hdr, "Disposition",
    "automatic-action/MDN-sent-automatically; deleted");
  str_append(hdr, "\r\n");

  /* original message's headers */
  str_printfa(hdr, "--%s\r\n", boundary);
  rfc2822_header_write(hdr, "Content-Type", "message/rfc822");
  str_append(hdr, "\r\n");
  o_stream_nsend(output, str_data(hdr), str_len(hdr));

  if (mail_get_hdr_stream(msgdata->mail, NULL, &input) == 0) {
    /* NOTE: If you add more headers, they need to be sorted. We'll
       drop Content-Type because we're not including the message
       body, and having a multipart Content-Type may confuse some
       MIME parsers when they don't see the message boundaries.
     */
    static const char *const exclude_headers[] = {
      "Content-Type"
    };

    input = i_stream_create_header_filter(
      input, HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR |
             HEADER_FILTER_HIDE_BODY,
      exclude_headers, N_ELEMENTS(exclude_headers),
      *null_header_filter_callback, NULL);
    o_stream_nsend_istream(output, input);
    i_stream_unref(&input);
  }

  str_truncate(hdr, 0);
  str_printfa(hdr, "\r\n\r\n--%s--\r\n", boundary);
  o_stream_nsend(output, str_data(hdr), str_len(hdr));

  if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
    if (ret < 0) {
      sieve_result_global_error(aenv,
        "failed to send rejection message to <%s>: %s "
        "(temporary failure)",
        smtp_address_encode(sender),
        str_sanitize(error, 512));
    } else {
      sieve_result_global_log_error(aenv,
        "failed to send rejection message to <%s>: %s "
        "(permanent failure)",
        smtp_address_encode(sender),
        str_sanitize(error, 512));
    }
    return SIEVE_EXEC_FAILURE;
  }

  return SIEVE_EXEC_OK;
}

int sieve_action_reject_mail(const struct sieve_action_exec_env *aenv,
           const struct smtp_address *recipient,
           const char *reason)
{
  const struct sieve_execute_env *eenv = aenv->exec_env;
  const struct sieve_script_env *senv = eenv->scriptenv;
  int result;

  T_BEGIN {
    if (senv->reject_mail != NULL) {
      result = (senv->reject_mail(senv, recipient,
                reason) >= 0 ?
          SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
    } else {
      result = sieve_action_do_reject_mail(aenv, recipient,
                   reason);
    }
  } T_END;

  return result;
}

/*
 * Mailbox
 */

bool sieve_mailbox_check_name(const char *mailbox, const char **error_r)
{
  if (!uni_utf8_str_is_valid(mailbox)) {
    *error_r = "invalid utf-8";
    return FALSE;
  }
  return TRUE;
}



Coverage Report

Created: 2026-08-13 06:41