Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 373 insertions, 0 deletions

diff --git a/src/local/mailbox.c b/src/local/mailbox.c
new file mode 100644
index 0000000..d31bc6b
--- /dev/null
+++ b/src/local/mailbox.c
@@ -0,0 +1,373 @@
+/*++
+/* NAME
+/*	mailbox 3
+/* SUMMARY
+/*	mailbox delivery
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	deliver_mailbox(state, usr_attr, statusp)
+/*	LOCAL_STATE state;
+/*	USER_ATTR usr_attr;
+/*	int	*statusp;
+/* DESCRIPTION
+/*	deliver_mailbox() delivers to mailbox, with duplicate
+/*	suppression. The default is direct mailbox delivery to
+/*	/var/[spool/]mail/\fIuser\fR; when a \fIhome_mailbox\fR
+/*	has been configured, mail is delivered to ~/$\fIhome_mailbox\fR;
+/*	and when a \fImailbox_command\fR has been configured, the message
+/*	is piped into the command instead.
+/*
+/*	A zero result means that the named user was not found.
+/*
+/*	Arguments:
+/* .IP state
+/*	The attributes that specify the message, recipient and more.
+/*	Attributes describing alias, include or forward expansion.
+/*	A table with the results from expanding aliases or lists.
+/* .IP usr_attr
+/*	Attributes describing user rights and environment.
+/* .IP statusp
+/*	Delivery status: see below.
+/* DIAGNOSTICS
+/*	The message delivery status is non-zero when delivery should be tried
+/*	again.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <htable.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <set_eugid.h>
+#include <warn_stat.h>
+
+/* Global library. */
+
+#include <mail_copy.h>
+#include <defer.h>
+#include <sent.h>
+#include <mypwd.h>
+#include <been_here.h>
+#include <mail_params.h>
+#include <deliver_pass.h>
+#include <mbox_open.h>
+#include <maps.h>
+#include <dsn_util.h>
+
+/* Application-specific. */
+
+#include "local.h"
+#include "biff_notify.h"
+
+#define YES	1
+#define NO	0
+
+/* deliver_mailbox_file - deliver to recipient mailbox */
+
+static int deliver_mailbox_file(LOCAL_STATE state, USER_ATTR usr_attr)
+{
+    const char *myname = "deliver_mailbox_file";
+    char   *spool_dir;
+    char   *mailbox;
+    DSN_BUF *why = state.msg_attr.why;
+    MBOX   *mp;
+    int     mail_copy_status;
+    int     deliver_status;
+    int     copy_flags;
+    VSTRING *biff;
+    off_t   end;
+    struct stat st;
+    uid_t   spool_uid;
+    gid_t   spool_gid;
+    uid_t   chown_uid;
+    gid_t   chown_gid;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * Don't deliver trace-only requests.
+     */
+    if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
+	dsb_simple(why, "2.0.0", "delivers to mailbox");
+	return (sent(BOUNCE_FLAGS(state.request), SENT_ATTR(state.msg_attr)));
+    }
+
+    /*
+     * Initialize. Assume the operation will fail. Set the delivered
+     * attribute to reflect the final recipient.
+     */
+    if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
+	msg_fatal("seek message file %s: %m", VSTREAM_PATH(state.msg_attr.fp));
+    if (var_frozen_delivered == 0)
+	state.msg_attr.delivered = state.msg_attr.rcpt.address;
+    mail_copy_status = MAIL_COPY_STAT_WRITE;
+    if (*var_home_mailbox) {
+	spool_dir = 0;
+	mailbox = concatenate(usr_attr.home, "/", var_home_mailbox, (char *) 0);
+    } else {
+	spool_dir = var_mail_spool_dir;
+	mailbox = concatenate(spool_dir, "/", state.msg_attr.user, (char *) 0);
+    }
+
+    /*
+     * Mailbox delivery with least privilege. As long as we do not use root
+     * privileges this code may also work over NFS.
+     * 
+     * If delivering to the recipient's home directory, perform all operations
+     * (including file locking) as that user (Mike Muuss, Army Research
+     * Laboratory, USA).
+     * 
+     * If delivering to the mail spool directory, and the spool directory is
+     * world-writable, deliver as the recipient; if the spool directory is
+     * group-writable, use the recipient user id and the mail spool group id.
+     * 
+     * Otherwise, use root privileges and chown the mailbox.
+     */
+    if (spool_dir == 0
+	|| stat(spool_dir, &st) < 0
+	|| (st.st_mode & S_IWOTH) != 0) {
+	spool_uid = usr_attr.uid;
+	spool_gid = usr_attr.gid;
+    } else if ((st.st_mode & S_IWGRP) != 0) {
+	spool_uid = usr_attr.uid;
+	spool_gid = st.st_gid;
+    } else {
+	spool_uid = 0;
+	spool_gid = 0;
+    }
+    if (spool_uid == usr_attr.uid) {
+	chown_uid = -1;
+	chown_gid = -1;
+    } else {
+	chown_uid = usr_attr.uid;
+	chown_gid = usr_attr.gid;
+    }
+    if (msg_verbose)
+	msg_info("spool_uid/gid %ld/%ld chown_uid/gid %ld/%ld",
+		 (long) spool_uid, (long) spool_gid,
+		 (long) chown_uid, (long) chown_gid);
+
+    /*
+     * Lock the mailbox and open/create the mailbox file. Depending on the
+     * type of locking used, we lock first or we open first.
+     * 
+     * Write the file as the recipient, so that file quota work.
+     */
+    copy_flags = MAIL_COPY_MBOX;
+    if ((local_deliver_hdr_mask & DELIVER_HDR_FILE) == 0)
+	copy_flags &= ~MAIL_COPY_DELIVERED;
+
+    set_eugid(spool_uid, spool_gid);
+    mp = mbox_open(mailbox, O_APPEND | O_WRONLY | O_CREAT,
+		   S_IRUSR | S_IWUSR, &st, chown_uid, chown_gid,
+		   local_mbox_lock_mask, "5.2.0", why);
+    if (mp != 0) {
+	if (spool_uid != usr_attr.uid || spool_gid != usr_attr.gid)
+	    set_eugid(usr_attr.uid, usr_attr.gid);
+	if (S_ISREG(st.st_mode) == 0) {
+	    vstream_fclose(mp->fp);
+	    dsb_simple(why, "5.2.0",
+		       "destination %s is not a regular file", mailbox);
+	} else if (var_strict_mbox_owner && st.st_uid != usr_attr.uid) {
+	    vstream_fclose(mp->fp);
+	    dsb_simple(why, "4.2.0",
+		       "destination %s is not owned by recipient", mailbox);
+	    msg_warn("specify \"%s = no\" to ignore mailbox ownership mismatch",
+		     VAR_STRICT_MBOX_OWNER);
+	} else {
+	    if ((end = vstream_fseek(mp->fp, (off_t) 0, SEEK_END)) < 0)
+		msg_fatal("seek mailbox file %s: %m", mailbox);
+	    mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr), mp->fp,
+					 copy_flags, "\n", why);
+	}
+	if (spool_uid != usr_attr.uid || spool_gid != usr_attr.gid)
+	    set_eugid(spool_uid, spool_gid);
+	mbox_release(mp);
+    }
+    set_eugid(var_owner_uid, var_owner_gid);
+
+    /*
+     * As the mail system, bounce, defer delivery, or report success.
+     */
+    if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
+	deliver_status = DEL_STAT_DEFER;
+    } else if (mail_copy_status != 0) {
+	vstring_sprintf_prepend(why->reason,
+				"cannot update mailbox %s for user %s. ",
+				mailbox, state.msg_attr.user);
+	deliver_status =
+	    (STR(why->status)[0] == '4' ?
+	     defer_append : bounce_append)
+	    (BOUNCE_FLAGS(state.request), BOUNCE_ATTR(state.msg_attr));
+    } else {
+	dsb_simple(why, "2.0.0", "delivered to mailbox");
+	deliver_status = sent(BOUNCE_FLAGS(state.request),
+			      SENT_ATTR(state.msg_attr));
+	if (var_biff) {
+	    biff = vstring_alloc(100);
+	    vstring_sprintf(biff, "%s@%ld", usr_attr.logname, (long) end);
+	    biff_notify(STR(biff), VSTRING_LEN(biff) + 1);
+	    vstring_free(biff);
+	}
+    }
+
+    /*
+     * Clean up.
+     */
+    myfree(mailbox);
+    return (deliver_status);
+}
+
+/* deliver_mailbox - deliver to recipient mailbox */
+
+int     deliver_mailbox(LOCAL_STATE state, USER_ATTR usr_attr, int *statusp)
+{
+    const char *myname = "deliver_mailbox";
+    int     status;
+    struct mypasswd *mbox_pwd;
+    char   *path;
+    static MAPS *transp_maps;
+    const char *map_transport;
+    static MAPS *cmd_maps;
+    const char *map_command;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * DUPLICATE ELIMINATION
+     * 
+     * Don't come here more than once, whether or not the recipient exists.
+     */
+    if (been_here(state.dup_filter, "mailbox %s", state.msg_attr.local))
+	return (YES);
+
+    /*
+     * Delegate mailbox delivery to another message transport.
+     */
+    if (*var_mbox_transp_maps && transp_maps == 0)
+	transp_maps = maps_create(VAR_MBOX_TRANSP_MAPS, var_mbox_transp_maps,
+				  DICT_FLAG_LOCK | DICT_FLAG_NO_REGSUB
+				  | DICT_FLAG_UTF8_REQUEST);
+    /* The -1 is a hint for the down-stream deliver_completed() function. */
+    if (transp_maps
+	&& (map_transport = maps_find(transp_maps, state.msg_attr.user,
+				      DICT_FLAG_NONE)) != 0) {
+	state.msg_attr.rcpt.offset = -1L;
+	*statusp = deliver_pass(MAIL_CLASS_PRIVATE, map_transport,
+				state.request, &state.msg_attr.rcpt);
+	return (YES);
+    } else if (transp_maps && transp_maps->error != 0) {
+	/* Details in the logfile. */
+	dsb_simple(state.msg_attr.why, "4.3.0", "table lookup failure");
+	*statusp = defer_append(BOUNCE_FLAGS(state.request),
+				BOUNCE_ATTR(state.msg_attr));
+	return (YES);
+    }
+    if (*var_mailbox_transport) {
+	state.msg_attr.rcpt.offset = -1L;
+	*statusp = deliver_pass(MAIL_CLASS_PRIVATE, var_mailbox_transport,
+				state.request, &state.msg_attr.rcpt);
+	return (YES);
+    }
+
+    /*
+     * Skip delivery when this recipient does not exist.
+     */
+    if ((errno = mypwnam_err(state.msg_attr.user, &mbox_pwd)) != 0) {
+	msg_warn("error looking up passwd info for %s: %m",
+		 state.msg_attr.user);
+	dsb_simple(state.msg_attr.why, "4.0.0", "user lookup error");
+	*statusp = defer_append(BOUNCE_FLAGS(state.request),
+				BOUNCE_ATTR(state.msg_attr));
+	return (YES);
+    }
+    if (mbox_pwd == 0)
+	return (NO);
+
+    /*
+     * No early returns or we have a memory leak.
+     */
+
+    /*
+     * DELIVERY RIGHTS
+     * 
+     * Use the rights of the recipient user.
+     */
+    SET_USER_ATTR(usr_attr, mbox_pwd, state.level);
+
+    /*
+     * Deliver to mailbox, maildir or to external command.
+     */
+#define LAST_CHAR(s) (s[strlen(s) - 1])
+
+    if (*var_mailbox_cmd_maps && cmd_maps == 0)
+	cmd_maps = maps_create(VAR_MAILBOX_CMD_MAPS, var_mailbox_cmd_maps,
+			       DICT_FLAG_LOCK | DICT_FLAG_PARANOID
+			       | DICT_FLAG_UTF8_REQUEST);
+
+    if (cmd_maps && (map_command = maps_find(cmd_maps, state.msg_attr.user,
+					     DICT_FLAG_NONE)) != 0) {
+	status = deliver_command(state, usr_attr, map_command);
+    } else if (cmd_maps && cmd_maps->error != 0) {
+	/* Details in the logfile. */
+	dsb_simple(state.msg_attr.why, "4.3.0", "table lookup failure");
+	status = defer_append(BOUNCE_FLAGS(state.request),
+			      BOUNCE_ATTR(state.msg_attr));
+    } else if (*var_mailbox_command) {
+	status = deliver_command(state, usr_attr, var_mailbox_command);
+    } else if (*var_home_mailbox && LAST_CHAR(var_home_mailbox) == '/') {
+	path = concatenate(usr_attr.home, "/", var_home_mailbox, (char *) 0);
+	status = deliver_maildir(state, usr_attr, path);
+	myfree(path);
+    } else if (*var_mail_spool_dir && LAST_CHAR(var_mail_spool_dir) == '/') {
+	path = concatenate(var_mail_spool_dir, state.msg_attr.user,
+			   "/", (char *) 0);
+	status = deliver_maildir(state, usr_attr, path);
+	myfree(path);
+    } else
+	status = deliver_mailbox_file(state, usr_attr);
+
+    /*
+     * Cleanup.
+     */
+    mypwfree(mbox_pwd);
+    *statusp = status;
+    return (YES);
+}