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-rw-r--r--Makefile3
-rw-r--r--trainstore.c311
2 files changed, 314 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index b833a3f..237bceb 100644
--- a/Makefile
+++ b/Makefile
@@ -54,6 +54,9 @@ endif
ifeq ("$(BACKEND)", "crm114-exec")
objs += signature.o
endif
+ifeq ("$(BACKEND)", "trainstore")
+CFLAGS += -lssl
+endif
# main make rules
CFLAGS += -fPIC -shared -Wall -Wextra -DPLUGINNAME=$(PLUGINNAME)
diff --git a/trainstore.c b/trainstore.c
new file mode 100644
index 0000000..bcd40be
--- /dev/null
+++ b/trainstore.c
@@ -0,0 +1,311 @@
+/*
+ * mailing backend for dovecot antispam plugin
+ *
+ * Copyright (C) 2009 Alexander Sulfrian <alexander@sulfrian.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License Version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <openssl/sha.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <libgen.h>
+
+#include "lib.h"
+#include "dict.h"
+#include "mail-storage-private.h"
+#include "ostream.h"
+#include "istream.h"
+
+#include "antispam-plugin.h"
+
+static const char *spamdir = NULL;
+static const char *hamdir = NULL;
+
+struct antispam_transaction_context {
+ int count;
+};
+
+int mkdir_rec(const char *dir, mode_t mask) {
+ char *parent;
+ struct stat sb;
+ int status;
+
+ if (stat(dir, &sb) == 0) {
+ if (! S_ISDIR(sb.st_mode)) {
+ return -1;
+ }
+
+ return 0;
+ }
+
+ t_push();
+
+ parent = t_malloc(strlen(dir) + 1);
+ strcpy(parent, dir);
+
+ if ((status = mkdir_rec(dirname(parent), mask)) == 0) {
+ mkdir(dir, mask);
+
+ status = 0;
+ }
+
+ t_pop();
+
+ return status;
+}
+
+struct antispam_transaction_context *
+backend_start(struct mailbox *box __attr_unused__)
+{
+ struct antispam_transaction_context *ast;
+
+ ast = i_new(struct antispam_transaction_context, 1);
+ ast->count = 0;
+
+ /* Create spam and hamdir */
+ mkdir_rec(spamdir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+ mkdir_rec(hamdir, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
+
+ return ast;
+}
+
+void backend_rollback(struct antispam_transaction_context *ast)
+{
+ i_free(ast);
+}
+
+int backend_commit(struct mailbox_transaction_context *ctx __attr_unused__,
+ struct antispam_transaction_context *ast)
+{
+ i_free(ast);
+ return 0;
+}
+
+static char *create_unique_mailname(const char *date, const char *mail_id, char *sha1)
+{
+ char *unique_string;
+ unsigned char *sha_bytes;
+
+ t_push();
+
+ unique_string = t_malloc(strlen(date) + strlen(mail_id) + 1);
+ i_snprintf(unique_string, strlen(date) + strlen(mail_id) + 1, "%s%s", date, mail_id);
+
+ sha_bytes = t_malloc(20);
+ sha_bytes = SHA1((unsigned char*)unique_string, strlen(date) + strlen(mail_id), sha_bytes);
+
+ int i;
+ for (i = 0; i < 20; i++) {
+ i_snprintf(sha1+(i*2), 3, "%02hhx", sha_bytes[i]);
+ }
+ sha1[40] = 0;
+
+ t_pop();
+
+ return sha1;
+}
+
+int backend_handle_mail(struct mailbox_transaction_context *t,
+ struct antispam_transaction_context *ast,
+ struct mail *mail, enum classification wanted)
+{
+ struct istream *mailstream;
+ struct ostream *outstream;
+ int ret;
+ char *file;
+ const unsigned char *beginning;
+ size_t size;
+ int fd;
+ char *name = NULL, *check_file = NULL;
+ const char *date = NULL, *mail_id = NULL, *dest = NULL, *other = NULL;
+ struct stat sb;
+
+ if (!hamdir || !spamdir) {
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "antispam plugin not configured");
+ return -1;
+ }
+
+ mailstream = get_mail_stream(mail);
+ if (!mailstream) {
+ mail_storage_set_error(t->box->storage,
+ ME(EXPUNGED)
+ "Failed to get mail contents");
+ return -1;
+ }
+
+ t_push();
+
+ /* Generate unique id for mail */
+
+ /* get date header */
+ if (mail_get_first_header(mail, "Date", &date) == 0) {
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Invalid mail with no date header");
+ ret = -1;
+ goto out;
+ }
+
+ /* get message id */
+ if (mail_get_first_header(mail, "Message-Id", &mail_id) == 0) {
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Invalid mail with no message id header");
+ ret = -1;
+ goto out;
+ }
+
+ /* hash name and message id */
+ name = t_malloc(41 * sizeof(char));
+ name = create_unique_mailname(date, mail_id, name);
+
+ /* switch weather this should be ham or spam */
+ switch (wanted) {
+ case CLASS_SPAM:
+ dest = spamdir;
+ other = hamdir;
+ break;
+ case CLASS_NOTSPAM:
+ dest = hamdir;
+ other = spamdir;
+ break;
+ }
+
+ if (dest == NULL) {
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to determine whether mail is ham or spam");
+ ret = -1;
+ goto out;
+ }
+
+ /* check if this mail is already marked as the opposit */
+ check_file = t_malloc(2 + strlen(other) + strlen(name));
+ i_snprintf(check_file, 1 + strlen(other) + strlen(name), "%s/%s", other, name);
+
+ if (stat(check_file, &sb) == 0) {
+ debug("mail is marked opposit, remove it there");
+ unlink(check_file);
+ }
+
+ /* create file name */
+ file = t_malloc(2 + strlen(dest) + strlen(name));
+ i_snprintf(file, 1 + strlen(dest) + strlen(name), "%s/%s", dest, name);
+
+ if (stat(file, &sb) == 0) {
+ debug("mail is already there, nothing to do");
+ ret = 0;
+ goto out;
+ }
+
+ fd = creat(file, 0600);
+ if (fd < 0) {
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to create temporary file");
+ ret = -1;
+ goto out;
+ }
+
+ ast->count++;
+
+ outstream = o_stream_create_from_fd(fd, t->box->pool);
+ if (!outstream) {
+ ret = -1;
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to stream temporary file");
+ goto out_close;
+ }
+
+ if (o_stream_send(outstream, &wanted, sizeof(wanted))
+ != sizeof(wanted)) {
+ ret = -1;
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to write marker to temp file");
+ goto failed_to_copy;
+ }
+
+ if (i_stream_read_data(mailstream, &beginning, &size, 5) < 0 ||
+ size < 5) {
+ ret = -1;
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to read mail beginning");
+ goto failed_to_copy;
+ }
+
+ /* "From "? skip line */
+ if (memcmp("From ", beginning, 5) == 0) {
+ i_stream_read_next_line(mailstream);
+ }
+ else {
+ if (o_stream_send_str(outstream, "From ") < 0) {
+ ret = -1;
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to write line to temp");
+ goto failed_to_copy;
+ }
+ }
+
+ if (o_stream_send_istream(outstream, mailstream) < 0) {
+ ret = -1;
+ mail_storage_set_error(t->box->storage,
+ ME(NOTPOSSIBLE)
+ "Failed to copy to temporary file");
+ goto failed_to_copy;
+ }
+
+ ret = 0;
+
+ failed_to_copy:
+ o_stream_destroy(&outstream);
+ out_close:
+ close(fd);
+ out:
+ t_pop();
+
+ return ret;
+}
+
+void backend_init(pool_t pool __attr_unused__)
+{
+ const char *tmp;
+
+ tmp = get_setting("DIR_SPAM");
+ if (tmp) {
+ spamdir = tmp;
+ debug("mail backend spam directory %s\n", tmp);
+ }
+
+ tmp = get_setting("DIR_NOTSPAM");
+ if (tmp) {
+ hamdir = tmp;
+ debug("mail backend not-spam directory %s\n", tmp);
+ }
+}
+
+void backend_exit(void)
+{
+}