Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 307 insertions, 0 deletions

diff --git a/src/local/recipient.c b/src/local/recipient.c
new file mode 100644
index 0000000..e3f4d1c
--- /dev/null
+++ b/src/local/recipient.c
@@ -0,0 +1,307 @@
+/*++
+/* NAME
+/*	recipient 3
+/* SUMMARY
+/*	deliver to one local recipient
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	deliver_recipient(state, usr_attr)
+/*	LOCAL_STATE state;
+/*	USER_ATTR *usr_attr;
+/* DESCRIPTION
+/*	deliver_recipient() delivers a message to a local recipient.
+/*	It is called initially when the queue manager requests
+/*	delivery to a local recipient, and is called recursively
+/*	when an alias or forward file expands to a local recipient.
+/*
+/*	When called recursively with, for example, a result from alias
+/*	or forward file expansion, aliases are expanded immediately,
+/*	but mail for non-alias destinations is submitted as a new
+/*	message, so that each recipient has a dedicated queue file
+/*	message delivery status record (in a shared queue file).
+/*
+/*	When the \fIrecipient_delimiter\fR configuration parameter
+/*	is set, it is used to separate cookies off recipient names.
+/*	A common setting is to have "recipient_delimiter = +"
+/*	so that mail for \fIuser+foo\fR is delivered to \fIuser\fR,
+/*	with a "Delivered-To: user+foo@domain" header line.
+/*
+/*	Arguments:
+/* .IP state
+/*	The attributes that specify the message, sender, and more.
+/*	Attributes describing alias, include or forward expansion.
+/*	A table with the results from expanding aliases or lists.
+/*	A table with delivered-to: addresses taken from the message.
+/* .IP usr_attr
+/*	Attributes describing user rights and environment.
+/* DIAGNOSTICS
+/*	deliver_recipient() returns non-zero when delivery should be
+/*	tried again.
+/* BUGS
+/*	Mutually-recursive aliases or $HOME/.forward files aren't
+/*	detected when they could be. The resulting mail forwarding loop
+/*	is broken by the use of the Delivered-To: message header.
+/* SEE ALSO
+/*	alias(3) delivery to aliases
+/*	mailbox(3) delivery to mailbox
+/*	dotforward(3) delivery to destinations in .forward file
+/* 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <htable.h>
+#include <split_at.h>
+#include <stringops.h>
+#include <dict.h>
+#include <stat_as.h>
+
+/* Global library. */
+
+#include <bounce.h>
+#include <defer.h>
+#include <mail_params.h>
+#include <split_addr.h>
+#include <strip_addr.h>
+#include <ext_prop.h>
+#include <mypwd.h>
+#include <canon_addr.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+/* deliver_switch - branch on recipient type */
+
+static int deliver_switch(LOCAL_STATE state, USER_ATTR usr_attr)
+{
+    const char *myname = "deliver_switch";
+    int     status = 0;
+    struct stat st;
+    struct mypasswd *mypwd;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+
+    /*
+     * \user is special: it means don't do any alias or forward expansion.
+     * 
+     * XXX This code currently does not work due to revision of the RFC822
+     * address parser. \user should be permitted only in locally specified
+     * aliases, includes or forward files.
+     * 
+     * XXX Should test for presence of user home directory.
+     */
+    if (state.msg_attr.rcpt.address[0] == '\\') {
+	state.msg_attr.rcpt.address++, state.msg_attr.local++, state.msg_attr.user++;
+	if (deliver_mailbox(state, usr_attr, &status) == 0)
+	    status = deliver_unknown(state, usr_attr);
+	return (status);
+    }
+
+    /*
+     * Otherwise, alias expansion has highest precedence. First look up the
+     * full localpart, then the bare user. Obey the address extension
+     * propagation policy.
+     */
+    state.msg_attr.unmatched = 0;
+    if (deliver_alias(state, usr_attr, state.msg_attr.local, &status))
+	return (status);
+    if (state.msg_attr.extension != 0) {
+	if (local_ext_prop_mask & EXT_PROP_ALIAS)
+	    state.msg_attr.unmatched = state.msg_attr.extension;
+	if (deliver_alias(state, usr_attr, state.msg_attr.user, &status))
+	    return (status);
+	state.msg_attr.unmatched = state.msg_attr.extension;
+    }
+
+    /*
+     * Special case for mail locally forwarded or aliased to a different
+     * local address. Resubmit the message via the cleanup service, so that
+     * each recipient gets a separate delivery queue file status record in
+     * the new queue file. The downside of this approach is that mutually
+     * recursive .forward files cause a mail forwarding loop. Fortunately,
+     * the loop can be broken by the use of the Delivered-To: message header.
+     * 
+     * The code below must not trigger on mail sent to an alias that has no
+     * owner- companion, so that mail for an alias first.last->username is
+     * delivered directly, instead of going through username->first.last
+     * canonical mappings in the cleanup service. The downside of this
+     * approach is that recipients in the expansion of an alias without
+     * owner- won't have separate delivery queue file status records, because
+     * for them, the message won't be resubmitted as a new queue file.
+     * 
+     * Do something sensible on systems that receive mail for multiple domains,
+     * such as primary.name and secondary.name. Don't resubmit the message
+     * when mail for `user@secondary.name' is delivered to a .forward file
+     * that lists `user' or `user@primary.name'. We already know that the
+     * recipient domain is local, so we only have to compare local parts.
+     */
+    if (state.msg_attr.owner != 0
+	&& strcasecmp_utf8(state.msg_attr.owner, state.msg_attr.user) != 0)
+	return (deliver_indirect(state));
+
+    /*
+     * Always forward recipients in :include: files.
+     */
+    if (state.msg_attr.exp_type == EXPAND_TYPE_INCL)
+	return (deliver_indirect(state));
+
+    /*
+     * Delivery to local user. First try expansion of the recipient's
+     * $HOME/.forward file, then mailbox delivery. Back off when the user's
+     * home directory does not exist.
+     */
+    mypwd = 0;
+    if (var_stat_home_dir
+	&& (errno = mypwnam_err(state.msg_attr.user, &mypwd)) != 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");
+	return (defer_append(BOUNCE_FLAGS(state.request),
+			     BOUNCE_ATTR(state.msg_attr)));
+    }
+    if (mypwd != 0) {
+	if (stat_as(mypwd->pw_dir, &st, mypwd->pw_uid, mypwd->pw_gid) < 0) {
+	    dsb_simple(state.msg_attr.why, "4.3.0",
+		       "cannot access home directory %s: %m", mypwd->pw_dir);
+	    mypwfree(mypwd);
+	    return (defer_append(BOUNCE_FLAGS(state.request),
+				 BOUNCE_ATTR(state.msg_attr)));
+	}
+	mypwfree(mypwd);
+    }
+    if (deliver_dotforward(state, usr_attr, &status) == 0
+	&& deliver_mailbox(state, usr_attr, &status) == 0)
+	status = deliver_unknown(state, usr_attr);
+    return (status);
+}
+
+/* deliver_recipient - deliver one local recipient */
+
+int     deliver_recipient(LOCAL_STATE state, USER_ATTR usr_attr)
+{
+    const char *myname = "deliver_recipient";
+    VSTRING *folded;
+    int     rcpt_stat;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * Duplicate filter.
+     */
+    if (been_here(state.dup_filter, "recipient %d %s",
+		  state.level, state.msg_attr.rcpt.address))
+	return (0);
+
+    /*
+     * With each level of recursion, detect and break external message
+     * forwarding loops.
+     * 
+     * If the looping recipient address has an owner- alias, send the error
+     * report there instead.
+     * 
+     * XXX A delivery agent cannot change the envelope sender address for
+     * bouncing. As a workaround we use a one-recipient bounce procedure.
+     * 
+     * The proper fix would be to record in the bounce logfile an error return
+     * address for each individual recipient. This would also eliminate the
+     * need for VERP specific bouncing code, at the cost of complicating the
+     * normal bounce sending procedure, but would simplify the code below.
+     */
+    if (delivered_hdr_find(state.loop_info, state.msg_attr.rcpt.address)) {
+	dsb_simple(state.msg_attr.why, "5.4.6", "mail forwarding loop for %s",
+		   state.msg_attr.rcpt.address);
+	/* Account for possible owner- sender address override. */
+	return (bounce_workaround(state));
+    }
+
+    /*
+     * Set up the recipient-specific attributes. If this is forwarded mail,
+     * leave the delivered attribute alone, so that the forwarded message
+     * will show the correct forwarding recipient.
+     */
+    if (state.msg_attr.delivered == 0)
+	state.msg_attr.delivered = state.msg_attr.rcpt.address;
+    folded = vstring_alloc(100);
+    state.msg_attr.local = casefold(folded, state.msg_attr.rcpt.address);
+    if ((state.msg_attr.domain = split_at_right(state.msg_attr.local, '@')) == 0)
+	msg_warn("no @ in recipient address: %s", state.msg_attr.local);
+
+    /*
+     * Address extension management.
+     * 
+     * XXX Fix 20100422, finalized 20100529: it is too error-prone to
+     * distinguish between "no extension" and "no valid extension", so we
+     * drop an invalid extension from the recipient address local-part.
+     */
+    state.msg_attr.user = mystrdup(state.msg_attr.local);
+    if (*var_rcpt_delim) {
+	state.msg_attr.extension =
+	    split_addr(state.msg_attr.user, var_rcpt_delim);
+	if (state.msg_attr.extension && strchr(state.msg_attr.extension, '/')) {
+	    msg_warn("%s: address with illegal extension: %s",
+		     state.msg_attr.queue_id, state.msg_attr.local);
+	    state.msg_attr.extension = 0;
+	    /* XXX Can't myfree + mystrdup, must truncate instead. */
+	    state.msg_attr.local[strlen(state.msg_attr.user)] = 0;
+	    /* Truncating is safe. The code below rejects null usernames. */
+	}
+    } else
+	state.msg_attr.extension = 0;
+    state.msg_attr.unmatched = state.msg_attr.extension;
+
+    /*
+     * Do not allow null usernames.
+     */
+    if (state.msg_attr.user[0] == 0) {
+	dsb_simple(state.msg_attr.why, "5.1.3",
+		   "null username in \"%s\"", state.msg_attr.rcpt.address);
+	return (bounce_append(BOUNCE_FLAGS(state.request),
+			      BOUNCE_ATTR(state.msg_attr)));
+    }
+
+    /*
+     * Run the recipient through the delivery switch.
+     */
+    if (msg_verbose)
+	deliver_attr_dump(&state.msg_attr);
+    rcpt_stat = deliver_switch(state, usr_attr);
+
+    /*
+     * Clean up.
+     */
+    vstring_free(folded);
+    myfree(state.msg_attr.user);
+
+    return (rcpt_stat);
+}