meillo@367: /*
meillo@367: **  MasqMail
meillo@367: **  Copyright (C) 1999-2001 Oliver Kurth
meillo@367: **  Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@367: **
meillo@367: **  This program is free software; you can redistribute it and/or modify
meillo@367: **  it under the terms of the GNU General Public License as published by
meillo@367: **  the Free Software Foundation; either version 2 of the License, or
meillo@367: **  (at your option) any later version.
meillo@367: **
meillo@367: **  This program is distributed in the hope that it will be useful,
meillo@367: **  but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@367: **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
meillo@367: **  GNU General Public License for more details.
meillo@367: **
meillo@367: **  You should have received a copy of the GNU General Public License
meillo@367: **  along with this program; if not, write to the Free Software
meillo@367: **  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0: */
meillo@0: 
meillo@15: #include <sys/wait.h>
meillo@169: #include <sys/stat.h>
meillo@15: 
meillo@0: #include "masqmail.h"
meillo@0: #include "peopen.h"
meillo@0: 
meillo@10: static void
meillo@366: message_stream(FILE *out, message *msg, GList *hdr_list, guint flags)
meillo@0: {
meillo@10: 	time_t now = time(NULL);
meillo@10: 	GList *node;
meillo@10: 
meillo@10: 	if (flags & MSGSTR_FROMLINE) {
meillo@408: 		fprintf(out, "From <%s@%s> %s", msg->return_path->local_part,
meillo@408: 				msg->return_path->domain, ctime(&now));
meillo@10: 	}
meillo@10: 
meillo@10: 	foreach(hdr_list, node) {
meillo@10: 		header *hdr = (header *) (node->data);
meillo@10: 		fputs(hdr->header, out);
meillo@10: 	}
meillo@10: 	putc('\n', out);
meillo@10: 	foreach(msg->data_list, node) {
meillo@10: 		/* From hack: */
meillo@10: 		if (flags & MSGSTR_FROMHACK) {
meillo@10: 			if (strncmp(node->data, "From ", 5) == 0)
meillo@10: 				putc('>', out);
meillo@10: 		}
meillo@10: 		fputs(node->data, out);
meillo@10: 	}
meillo@10: 	putc('\n', out);
meillo@0: }
meillo@0: 
meillo@10: gboolean
meillo@366: append_file(message *msg, GList *hdr_list, gchar *user)
meillo@0: {
meillo@10: 	struct passwd *pw;
meillo@10: 	gboolean ok = FALSE;
meillo@332: 	uid_t saved_uid = geteuid();
meillo@332: 	gid_t saved_gid = getegid();
meillo@332: 	gboolean uid_ok = TRUE, gid_ok = TRUE;
meillo@332: 	gchar *filename;
meillo@332: 	FILE *out;
meillo@0: 
meillo@10: 	/* headers may be special for a local delivery */
meillo@332: 	if (!hdr_list)
meillo@10: 		hdr_list = msg->hdr_list;
meillo@0: 
meillo@332: 	if (!(pw = getpwnam(user))) {
meillo@408: 		logwrite(LOG_ALERT, "could not find password entry for "
meillo@408: 				"user %s\n", user);
meillo@10: 		errno = ENOENT;  /* getpwnam does not set errno correctly */
meillo@332: 		return FALSE;
meillo@0: 	}
meillo@0: 
meillo@332: 	if (!conf.run_as_user) {
meillo@332: 		uid_ok = (seteuid(0) == 0);
meillo@332: 		if (uid_ok) {
meillo@332: 			gid_ok = (setegid(conf.mail_gid) == 0);
meillo@332: 			uid_ok = (seteuid(pw->pw_uid) == 0);
meillo@332: 		}
meillo@332: 		if (!uid_ok || !gid_ok) {
meillo@408: 			logwrite(LOG_ALERT, "could not set uid or gid for "
meillo@408: 					"local delivery, uid = %d: %s\n",
meillo@408: 					pw->pw_uid, strerror(errno));
meillo@332: 			return FALSE;
meillo@332: 		}
meillo@332: 	}
meillo@332: 
meillo@332: 	DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
meillo@332: 
meillo@332: 	filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
meillo@332: 	if (!(out = fopen(filename, "a"))) {
meillo@408: 		logwrite(LOG_ALERT, "could not open file %s: %s\n",
meillo@408: 				filename, strerror(errno));
meillo@332: 	} else {
meillo@332: #ifdef USE_LIBLOCKFILE
meillo@332: 		gint err;
meillo@332: 		/* lock file using liblockfile */
meillo@332: 		err = maillock(user, 3);
meillo@332: 		if (err == 0) {
meillo@332: #else
meillo@332: 		/* lock file: */
meillo@332: 		struct flock lock;
meillo@332: 		lock.l_type = F_WRLCK;
meillo@332: 		lock.l_whence = SEEK_END;
meillo@332: 		lock.l_start = lock.l_len = 0;
meillo@332: 		if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
meillo@332: #endif
meillo@332: 			fchmod(fileno(out), 0600);
meillo@408: 			message_stream(out, msg, hdr_list,
meillo@408: 					MSGSTR_FROMLINE | MSGSTR_FROMHACK);
meillo@332: 			ok = TRUE;
meillo@332: 
meillo@332: 			/* close when still user */
meillo@332: 			fclose(out);
meillo@332: #ifdef USE_LIBLOCKFILE
meillo@332: 			mailunlock();
meillo@332: #endif
meillo@332: 		} else {
meillo@332: 			fclose(out);
meillo@332: #ifdef USE_LIBLOCKFILE
meillo@408: 			DEBUG(3) debugf("could not lock file %s: error %d\n",
meillo@408: 					filename, err);
meillo@332: 		}  /* XEmacs indenting convenience... */
meillo@332: #else
meillo@408: 			DEBUG(3) debugf("could not lock file %s: %s\n",
meillo@408: 					filename, strerror(errno));
meillo@332: 		}
meillo@332: #endif
meillo@332: 	}
meillo@332: 	g_free(filename);
meillo@332: 
meillo@332: 	if (!conf.run_as_user) {
meillo@332: 		uid_ok = (seteuid(0) == 0);
meillo@332: 		if (uid_ok) {
meillo@332: 			gid_ok = (setegid(saved_gid) == 0);
meillo@332: 			uid_ok = (seteuid(saved_uid) == 0);
meillo@332: 		}
meillo@332: 	}
meillo@332: 
meillo@332: 	if (!uid_ok || !gid_ok) {
meillo@367: 		/*
meillo@367: 		**  FIXME: if this fails we HAVE to exit, because we shall
meillo@367: 		**  not run with some users id. But we do not return, and so
meillo@367: 		**  this message will not be finished, so the user will get
meillo@367: 		**  the message again next time a delivery is attempted...
meillo@367: 		*/
meillo@408: 		logwrite(LOG_ALERT, "could not set back uid or gid after "
meillo@408: 				"local delivery: %s\n", strerror(errno));
meillo@408: 		logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, "
meillo@408: 				"want = %d, %d\n", getuid(), getgid(),
meillo@408: 				geteuid(), getegid(), saved_uid, saved_gid);
meillo@408: 		logwrite(LOG_ALERT, "In case of trouble, see "
meillo@408: 				"local.c:append_file() for details.\n",
meillo@408: 				strerror(errno));
meillo@332: 		exit(1);
meillo@332: 	}
meillo@10: 	return ok;
meillo@0: }
meillo@0: 
meillo@0: gboolean
meillo@366: pipe_out(message *msg, GList *hdr_list, address *rcpt, gchar *cmd, guint flags)
meillo@0: {
meillo@10: 	gchar *envp[40];
meillo@10: 	FILE *out;
meillo@10: 	uid_t saved_uid = geteuid();
meillo@10: 	gid_t saved_gid = getegid();
meillo@10: 	gboolean ok = FALSE;
meillo@10: 	gint i, n;
meillo@10: 	pid_t pid;
meillo@10: 	void (*old_signal) (int);
meillo@10: 	int status;
meillo@332: 	address *ancestor = addr_find_ancestor(rcpt);
meillo@0: 
meillo@10: 	/* set uid and gid to the mail ids */
meillo@10: 	if (!conf.run_as_user) {
meillo@408: 		set_euidgid(conf.mail_uid, conf.mail_gid,
meillo@408: 				&saved_uid, &saved_gid);
meillo@10: 	}
meillo@0: 
meillo@10: 	/* set environment */
meillo@332: 	n = 0;
meillo@408: 	envp[n++] = g_strdup_printf("SENDER=%s@%s",
meillo@408: 			msg->return_path->local_part,
meillo@408: 			msg->return_path->domain);
meillo@408: 	envp[n++] = g_strdup_printf("SENDER_DOMAIN=%s",
meillo@408: 			msg->return_path->domain);
meillo@408: 	envp[n++] = g_strdup_printf("SENDER_LOCAL=%s",
meillo@408: 			msg->return_path->local_part);
meillo@408: 	envp[n++] = g_strdup_printf("RECEIVED_HOST=%s",
meillo@408: 			msg->received_host ? msg->received_host : "");
meillo@0: 
meillo@408: 	envp[n++] = g_strdup_printf("RETURN_PATH=%s@%s",
meillo@408: 			msg->return_path->local_part,
meillo@408: 			msg->return_path->domain);
meillo@408: 	envp[n++] = g_strdup_printf("DOMAIN=%s",
meillo@408: 			ancestor->domain);
meillo@0: 
meillo@332: 	envp[n++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
meillo@332: 	envp[n++] = g_strdup_printf("USER=%s", ancestor->local_part);
meillo@332: 	envp[n++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
meillo@0: 
meillo@332: 	envp[n++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
meillo@332: 	envp[n++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
meillo@0: 
meillo@332: 	envp[n] = NULL;
meillo@0: 
meillo@10: 	old_signal = signal(SIGCHLD, SIG_DFL);
meillo@0: 
meillo@10: 	out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
meillo@332: 	if (!out) {
meillo@408: 		logwrite(LOG_ALERT, "could not open pipe '%s': %s\n",
meillo@408: 				cmd, strerror(errno));
meillo@332: 	} else {
meillo@10: 		message_stream(out, msg, hdr_list, flags);
meillo@0: 
meillo@10: 		fclose(out);
meillo@0: 
meillo@10: 		waitpid(pid, &status, 0);
meillo@0: 
meillo@10: 		if (WEXITSTATUS(status) != 0) {
meillo@10: 			int exstat = WEXITSTATUS(status);
meillo@408: 			logwrite(LOG_ALERT, "process returned %d (%s)\n",
meillo@408: 					exstat, ext_strerror(1024 + exstat));
meillo@10: 			errno = 1024 + exstat;
meillo@10: 		} else if (WIFSIGNALED(status)) {
meillo@408: 			logwrite(LOG_ALERT, "process got signal %d\n",
meillo@408: 					WTERMSIG(status));
meillo@10: 		} else
meillo@10: 			ok = TRUE;
meillo@0: 
meillo@332: 	}
meillo@0: 
meillo@10: 	signal(SIGCHLD, old_signal);
meillo@0: 
meillo@10: 	/* free environment */
meillo@10: 	for (i = 0; i < n; i++) {
meillo@10: 		g_free(envp[i]);
meillo@10: 	}
meillo@0: 
meillo@10: 	/* set uid and gid back */
meillo@10: 	if (!conf.run_as_user) {
meillo@10: 		set_euidgid(saved_uid, saved_gid, NULL, NULL);
meillo@10: 	}
meillo@0: 
meillo@10: 	return ok;
meillo@0: }