/*
* Copyright © 2006-2007 Pierre Habouzit
+ * Copyright © 2008 Florent Bruneau
*/
-#include <signal.h>
-#include <time.h>
#include <getopt.h>
+#include "buffer.h"
#include "common.h"
+#include "epoll.h"
+#include "tokens.h"
+#include "server.h"
-/* administrivia {{{ */
+#define DAEMON_NAME "postlicyd"
+#define DEFAULT_PORT 10000
+#define RUNAS_USER "nobody"
+#define RUNAS_GROUP "nogroup"
+
+DECLARE_MAIN
+
+enum smtp_state {
+ SMTP_UNKNOWN,
+ SMTP_CONNECT,
+ SMTP_EHLO,
+ SMTP_HELO = SMTP_EHLO,
+ SMTP_MAIL,
+ SMTP_RCPT,
+ SMTP_DATA,
+ SMTP_END_OF_MESSAGE,
+ SMTP_VRFY,
+ SMTP_ETRN,
+};
+
+/* \see http://www.postfix.org/SMTPD_POLICY_README.html */
+typedef struct query_t {
+ unsigned state : 4;
+ unsigned esmtp : 1;
+
+ const char *helo_name;
+ const char *queue_id;
+ const char *sender;
+ const char *recipient;
+ const char *recipient_count;
+ const char *client_address;
+ const char *client_name;
+ const char *reverse_client_name;
+ const char *instance;
+
+ /* postfix 2.2+ */
+ const char *sasl_method;
+ const char *sasl_username;
+ const char *sasl_sender;
+ const char *size;
+ const char *ccert_subject;
+ const char *ccert_issuer;
+ const char *ccert_fingerprint;
+
+ /* postfix 2.3+ */
+ const char *encryption_protocol;
+ const char *encryption_cipher;
+ const char *encryption_keysize;
+ const char *etrn_domain;
-static int main_initialize(void)
+ /* postfix 2.5+ */
+ const char *stress;
+
+ const char *eoq;
+} query_t;
+
+static query_t *query_new(void)
{
- openlog("postlicyd", LOG_PID, LOG_MAIL);
- signal(SIGPIPE, SIG_IGN);
- signal(SIGINT, &common_sighandler);
- signal(SIGTERM, &common_sighandler);
- signal(SIGSEGV, &common_sighandler);
- syslog(LOG_INFO, "Starting...");
- return 0;
+ return p_new(query_t, 1);
}
-static void main_shutdown(void)
+static void query_delete(query_t **query)
{
- closelog();
+ if (*query) {
+ p_delete(query);
+ }
}
-module_init(main_initialize);
-module_exit(main_shutdown);
+static void *query_starter(server_t* server)
+{
+ return query_new();
+}
-/* }}} */
+static int postfix_parsejob(query_t *query, char *p)
+{
+#define PARSE_CHECK(expr, error, ...) \
+ do { \
+ if (!(expr)) { \
+ syslog(LOG_ERR, error, ##__VA_ARGS__); \
+ return -1; \
+ } \
+ } while (0)
+
+ p_clear(query, 1);
+ while (*p != '\n') {
+ char *k, *v;
+ int klen, vlen, vtk;
+
+ while (isblank(*p))
+ p++;
+ p = strchr(k = p, '=');
+ PARSE_CHECK(p, "could not find '=' in line");
+ for (klen = p - k; klen && isblank(k[klen]); klen--);
+ p += 1; /* skip = */
+
+ while (isblank(*p))
+ p++;
+ p = strchr(v = p, '\n');
+ PARSE_CHECK(p, "could not find final \\n in line");
+ for (vlen = p - v; vlen && isblank(v[vlen]); vlen--);
+ p += 1; /* skip \n */
+
+ vtk = tokenize(v, vlen);
+ switch (tokenize(k, klen)) {
+#define CASE(up, low) case PTK_##up: query->low = v; v[vlen] = '\0'; break;
+ CASE(HELO_NAME, helo_name);
+ CASE(QUEUE_ID, queue_id);
+ CASE(SENDER, sender);
+ CASE(RECIPIENT, recipient);
+ CASE(RECIPIENT_COUNT, recipient_count);
+ CASE(CLIENT_ADDRESS, client_address);
+ CASE(CLIENT_NAME, client_name);
+ CASE(REVERSE_CLIENT_NAME, reverse_client_name);
+ CASE(INSTANCE, instance);
+ CASE(SASL_METHOD, sasl_method);
+ CASE(SASL_USERNAME, sasl_username);
+ CASE(SASL_SENDER, sasl_sender);
+ CASE(SIZE, size);
+ CASE(CCERT_SUBJECT, ccert_subject);
+ CASE(CCERT_ISSUER, ccert_issuer);
+ CASE(CCERT_FINGERPRINT, ccert_fingerprint);
+ CASE(ENCRYPTION_PROTOCOL, encryption_protocol);
+ CASE(ENCRYPTION_CIPHER, encryption_cipher);
+ CASE(ENCRYPTION_KEYSIZE, encryption_keysize);
+ CASE(ETRN_DOMAIN, etrn_domain);
+ CASE(STRESS, stress);
+#undef CASE
+
+ case PTK_REQUEST:
+ PARSE_CHECK(vtk == PTK_SMTPD_ACCESS_POLICY,
+ "unexpected `request' value: %.*s", vlen, v);
+ break;
+
+ case PTK_PROTOCOL_NAME:
+ PARSE_CHECK(vtk == PTK_SMTP || vtk == PTK_ESMTP,
+ "unexpected `protocol_name' value: %.*s", vlen, v);
+ query->esmtp = vtk == PTK_ESMTP;
+ break;
+
+ case PTK_PROTOCOL_STATE:
+ switch (vtk) {
+#define CASE(name) case PTK_##name: query->state = SMTP_##name; break;
+ CASE(CONNECT);
+ CASE(EHLO);
+ CASE(HELO);
+ CASE(MAIL);
+ CASE(RCPT);
+ CASE(DATA);
+ CASE(END_OF_MESSAGE);
+ CASE(VRFY);
+ CASE(ETRN);
+ default:
+ PARSE_CHECK(false, "unexpected `protocol_state` value: %.*s",
+ vlen, v);
+#undef CASE
+ }
+ break;
+
+ default:
+ syslog(LOG_WARNING, "unexpected key, skipped: %.*s", klen, k);
+ continue;
+ }
+ }
+
+ return query->state == SMTP_UNKNOWN ? -1 : 0;
+#undef PARSE_CHECK
+}
-void *job_run(void *_fd)
+__attribute__((format(printf,2,0)))
+static void policy_answer(server_t *pcy, const char *fmt, ...)
{
- int fd = (intptr_t)_fd;
+ va_list args;
+ const query_t* query = pcy->data;
- close(fd);
- return NULL;
+ buffer_addstr(&pcy->obuf, "action=");
+ va_start(args, fmt);
+ buffer_addvf(&pcy->obuf, fmt, args);
+ va_end(args);
+ buffer_addstr(&pcy->obuf, "\n\n");
+ buffer_consume(&pcy->ibuf, query->eoq - pcy->ibuf.data);
+ epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy);
}
-static void main_loop(void)
+static bool policy_run_filter(const query_t* query, void* filter, void* conf)
{
- int sock = -1;
+ return false;
+}
- while (!sigint) {
- int fd = accept(sock, NULL, 0);
- pthread_attr_t attr;
- pthread_t dummy;
+static void policy_process(server_t *pcy)
+{
+ const query_t* query = pcy->data;
+ if (!policy_run_filter(query, NULL, NULL)) {
+ policy_answer(pcy, "DUNNO");
+ }
+}
- if (fd < 0) {
- if (errno != EINTR || errno != EAGAIN)
- UNIXERR("accept");
- continue;
- }
+static int policy_run(server_t *pcy, void* config)
+{
+ ssize_t search_offs = MAX(0, pcy->ibuf.len - 1);
+ int nb = buffer_read(&pcy->ibuf, pcy->fd, -1);
+ const char *eoq;
+ query_t* query = pcy->data;
- pthread_attr_init(&attr);
- pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
- pthread_create(&dummy, &attr, job_run, (void *)(intptr_t)fd);
- pthread_attr_destroy(&attr);
+ if (nb < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 0;
+ UNIXERR("read");
+ return -1;
+ }
+ if (nb == 0) {
+ if (pcy->ibuf.len)
+ syslog(LOG_ERR, "unexpected end of data");
+ return -1;
}
- close(sock);
+ if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n")))
+ return 0;
+
+ if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0)
+ return -1;
+ query->eoq = eoq + strlen("\n\n");
+ epoll_modify(pcy->fd, 0, pcy);
+ policy_process(pcy);
+ return 0;
}
-int main(void)
+int start_listener(int port)
{
- if (atexit(common_shutdown)) {
- fputs("Cannot hook my atexit function, quitting !\n", stderr);
+ return start_server(port, NULL, NULL);
+}
+
+/* administrivia {{{ */
+
+void usage(void)
+{
+ fputs("usage: "DAEMON_NAME" [options] config\n"
+ "\n"
+ "Options:\n"
+ " -l <port> port to listen to\n"
+ " -p <pidfile> file to write our pid to\n"
+ " -f stay in foreground\n"
+ , stderr);
+}
+
+/* }}} */
+
+int main(int argc, char *argv[])
+{
+ bool unsafe = false;
+ const char *pidfile = NULL;
+ bool daemonize = true;
+ int port = DEFAULT_PORT;
+
+ for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) {
+ switch (c) {
+ case 'p':
+ pidfile = optarg;
+ break;
+ case 'u':
+ unsafe = true;
+ break;
+ case 'l':
+ port = atoi(optarg);
+ break;
+ case 'f':
+ daemonize = false;
+ break;
+ default:
+ usage();
+ return EXIT_FAILURE;
+ }
+ }
+
+ if (argc - optind != 1) {
+ usage();
return EXIT_FAILURE;
}
- common_initialize();
- main_loop();
- syslog(LOG_INFO, "Stopping...");
- return EXIT_SUCCESS;
+ if (common_setup(pidfile, false, RUNAS_USER, RUNAS_GROUP,
+ daemonize) != EXIT_SUCCESS
+ || start_listener(port) < 0) {
+ return EXIT_FAILURE;
+ }
+ return server_loop(query_starter, (delete_client_t)query_delete,
+ policy_run, NULL);
}
projects / apps / pfixtools.git / blobdiff