X-Git-Url: http://git.madism.org/?a=blobdiff_plain;f=main-postlicyd.c;h=97afe21d1daa54e0fc98391ee1a61ff14f66c935;hb=10b49f7af56977b8c27a26438b3cfb07ca63ae90;hp=70d9d69585798be8b6e5261b498dd83cccd549a0;hpb=7f5b0a5a99d73ee8d39a692ab3d289399a408e39;p=apps%2Fpfixtools.git diff --git a/main-postlicyd.c b/main-postlicyd.c index 70d9d69..97afe21 100644 --- a/main-postlicyd.c +++ b/main-postlicyd.c @@ -35,8 +35,220 @@ #include +#include "buffer.h" #include "common.h" #include "epoll.h" +#include "tokens.h" +#include "server.h" + +#define DAEMON_NAME "postlicyd" +#define DEFAULT_PORT 10000 +#define RUNAS_USER "nobody" +#define RUNAS_GROUP "nogroup" + +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 *ccsert_fingerprint; + + /* postfix 2.3+ */ + const char *encryption_protocol; + const char *encryption_cipher; + const char *encryption_keysize; + const char *etrn_domain; + + const char *eoq; +} query_t; + +static void* query_new() +{ + return p_new(query_t, 1); +} + +static void query_delete(void *arg) +{ + query_t **query = arg; + if (*query) { + p_delete(query); + } +} + +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(CCSERT_FINGERPRINT, ccsert_fingerprint); + CASE(ENCRYPTION_PROTOCOL, encryption_protocol); + CASE(ENCRYPTION_CIPHER, encryption_cipher); + CASE(ENCRYPTION_KEYSIZE, encryption_keysize); + CASE(ETRN_DOMAIN, etrn_domain); +#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); + break; + } + } + + return query->state == SMTP_UNKNOWN ? -1 : 0; +#undef PARSE_CHECK +} + +__attribute__((format(printf,2,0))) +static void policy_answer(server_t *pcy, const char *fmt, ...) +{ + va_list args; + va_start(args, fmt); + buffer_addvf(&pcy->obuf, fmt, args); + va_end(args); + buffer_addstr(&pcy->obuf, "\n\n"); + buffer_consume(&pcy->ibuf, ((query_t*)(pcy->data))->eoq - pcy->ibuf.data); + epoll_modify(pcy->fd, EPOLLIN | EPOLLOUT, pcy); +} + +static void policy_process(server_t *pcy) +{ + policy_answer(pcy, "DUNNO"); +} + +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; + + 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; + } + + if (!(eoq = strstr(pcy->ibuf.data + search_offs, "\n\n"))) + return 0; + + if (postfix_parsejob(pcy->data, pcy->ibuf.data) < 0) + return -1; + ((query_t*)pcy->data)->eoq = eoq + strlen("\n\n"); + epoll_modify(pcy->fd, 0, pcy); + policy_process(pcy); + return 0; +} + +int start_listener(int port) +{ + return start_server(port, NULL, NULL); +} /* administrivia {{{ */ @@ -46,6 +258,7 @@ static int main_initialize(void) signal(SIGPIPE, SIG_IGN); signal(SIGINT, &common_sighandler); signal(SIGTERM, &common_sighandler); + signal(SIGHUP, &common_sighandler); signal(SIGSEGV, &common_sighandler); syslog(LOG_INFO, "Starting..."); return 0; @@ -59,84 +272,69 @@ static void main_shutdown(void) module_init(main_initialize); module_exit(main_shutdown); -/* }}} */ - -void *job_run(void *_fd) +void usage(void) { - int fd = (intptr_t)_fd; - - close(fd); - pthread_detach(pthread_self()); - return NULL; + fputs("usage: "DAEMON_NAME" [options] config\n" + "\n" + "Options:\n" + " -l port to listen to\n" + " -p file to write our pid to\n" + " -f stay in foreground\n" + , stderr); } -static int main_loop(void) -{ - int exitcode = EXIT_SUCCESS; - int sock = -1; - - while (!sigint) { - int fd = accept(sock, NULL, 0); - pthread_t dummy; - - if (fd < 0) { - if (errno != EINTR || errno != EAGAIN) - UNIXERR("accept"); - continue; - } - - pthread_create(&dummy, NULL, job_run, (void *)(intptr_t)fd); - } - - close(sock); - return exitcode; -} +/* }}} */ int main(int argc, char *argv[]) { const char *pidfile = NULL; - FILE *f = NULL; - int res; + bool daemonize = true; + int port = DEFAULT_PORT; - common_initialize(); - for (int c = 0; (c = getopt(argc, argv, "h" "p:")) >= 0; ) { + for (int c = 0; (c = getopt(argc, argv, "hf" "l:p:")) >= 0; ) { switch (c) { case 'p': pidfile = optarg; break; + case 'l': + port = atoi(optarg); + break; + case 'f': + daemonize = false; + break; default: - //usage(); + usage(); return EXIT_FAILURE; } } - if (pidfile) { - f = fopen(pidfile, "w"); - if (!f) { - syslog(LOG_CRIT, "unable to write pidfile %s", pidfile); - } - fprintf(f, "%d\n", getpid()); - fflush(f); + if (argc - optind != 1) { + usage(); + return EXIT_FAILURE; } - if (daemon_detach() < 0) { - syslog(LOG_CRIT, "unable to fork"); + if (pidfile_open(pidfile) < 0) { + syslog(LOG_CRIT, "unable to write pidfile %s", pidfile); return EXIT_FAILURE; } - if (f) { - rewind(f); - ftruncate(fileno(f), 0); - fprintf(f, "%d\n", getpid()); - fflush(f); + if (drop_privileges(RUNAS_USER, RUNAS_GROUP) < 0) { + syslog(LOG_CRIT, "unable to drop privileges"); + return EXIT_FAILURE; } - res = main_loop(); - if (f) { - rewind(f); - ftruncate(fileno(f), 0); - fclose(f); - f = NULL; + + if (daemonize && daemon_detach() < 0) { + syslog(LOG_CRIT, "unable to fork"); + return EXIT_FAILURE; } + + pidfile_refresh(); + + if (start_listener(port) < 0) + return EXIT_FAILURE; + + (void)server_loop(query_new, query_delete, policy_run, NULL); + syslog(LOG_INFO, "Stopping..."); - return res; + return EXIT_SUCCESS; }