1 files changed, 118 insertions, 0 deletions
diff --git a/usr.sbin/smtpd/forward.c b/usr.sbin/smtpd/forward.c
new file mode 100644
index 00000000000..a1d510f9b4b
--- /dev/null
+++ b/usr.sbin/smtpd/forward.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/tree.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <db.h>
+#include <err.h>
+#include <errno.h>
+#include <event.h>
+#include <fcntl.h>
+#include <paths.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <util.h>
+
+#include "smtpd.h"
+
+int	alias_parse(struct alias *, char *);
+int	forwards_get(struct aliaseslist *, char *);
+
+int
+forwards_get(struct aliaseslist *aliases, char *username)
+{
+	FILE *fp;
+	struct alias alias;
+	struct alias *aliasp;
+	char	pathname[MAXPATHLEN];
+	struct passwd *pw;
+	char *buf, *lbuf;
+	size_t len;
+	struct stat sb;
+
+	pw = getpwnam(username);
+	if (pw == NULL)
+		return 0;
+
+	if (snprintf(pathname, MAXPATHLEN, "%s/.forward", pw->pw_dir)
+	    >= MAXPATHLEN)
+		return 0;
+
+	fp = fopen(pathname, "r");
+	if (fp == NULL)
+		return 0;
+
+	/* make sure ~/ is not writable by anyone but owner */
+	if (stat(pw->pw_dir, &sb) == -1)
+		goto bad;
+	if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
+		goto bad;
+
+	/* make sure ~/.forward is not writable by anyone but owner */
+	if (fstat(fileno(fp), &sb) == -1)
+		goto bad;
+	if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
+		goto bad;
+
+	lbuf = NULL;
+	while ((buf = fgetln(fp, &len))) {
+		if (buf[len - 1] == '\n')
+			buf[len - 1] = '\0';
+		else {
+			/* EOF without EOL, copy and add the NUL */
+			if ((lbuf = malloc(len + 1)) == NULL)
+				err(1, NULL);
+			memcpy(lbuf, buf, len);
+			lbuf[len] = '\0';
+			buf = lbuf;
+		}
+		printf("%s\n", buf);
+		if (! alias_parse(&alias, buf)) {
+			log_debug("bad entry in ~/.forward");
+			continue;
+		}
+
+		if (alias.type == ALIAS_INCLUDE) {
+			log_debug("includes are forbidden in ~/.forward");
+			continue;
+		}
+		aliasp = calloc(1, sizeof(struct alias));
+		if (aliasp == NULL)
+			err(1, "calloc");
+		*aliasp = alias;
+		TAILQ_INSERT_HEAD(aliases, aliasp, entry);
+
+	}
+	free(lbuf);
+	fclose(fp);
+	return 1;
+
+bad:
+	if (fp != NULL)
+		fclose(fp);
+	return 0;
+}