Adding upstream version 3.5.24.upstream/3.5.24upstream

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

1 files changed, 386 insertions, 0 deletions

diff --git a/src/local/alias.c b/src/local/alias.c
new file mode 100644
index 0000000..99e3dd6
--- /dev/null
+++ b/src/local/alias.c
@@ -0,0 +1,386 @@
+/*++
+/* NAME
+/*	alias 3
+/* SUMMARY
+/*	alias data base lookups
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	deliver_alias(state, usr_attr, name, statusp)
+/*	LOCAL_STATE state;
+/*	USER_ATTR usr_attr;
+/*	char	*name;
+/*	int	*statusp;
+/* DESCRIPTION
+/*	deliver_alias() looks up the expansion of the recipient in
+/*	the global alias database and delivers the message to the
+/*	listed destinations. The result is zero when no alias was found
+/*	or when the message should be delivered to the user instead.
+/*
+/*	deliver_alias() has wired-in knowledge about a few reserved
+/*	recipient names.
+/* .IP \(bu
+/*	When no alias is found for the local \fIpostmaster\fR or
+/*	\fImailer-daemon\fR a warning is issued and the message
+/*	is discarded.
+/* .IP \(bu
+/*	When an alias exists for recipient \fIname\fR, and an alias
+/*	exists for \fIowner-name\fR, the sender address is changed
+/*	to \fIowner-name\fR, and the owner delivery attribute is
+/*	set accordingly. This feature is disabled with
+/*	"owner_request_special = no".
+/* .PP
+/*	Arguments:
+/* .IP state
+/*	Attributes that specify the message, recipient and more.
+/*	Expansion type (alias, include, .forward).
+/*	A table with the results from expanding aliases or lists.
+/*	A table with delivered-to: addresses taken from the message.
+/* .IP usr_attr
+/*	User attributes (rights, environment).
+/* .IP name
+/*	The alias to be looked up.
+/* .IP statusp
+/*	Delivery status. See below.
+/* DIAGNOSTICS
+/*	Fatal errors: out of memory. The 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
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <htable.h>
+#include <dict.h>
+#include <argv.h>
+#include <stringops.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <vstream.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <defer.h>
+#include <maps.h>
+#include <bounce.h>
+#include <mypwd.h>
+#include <canon_addr.h>
+#include <sent.h>
+#include <trace.h>
+#include <dsn_mask.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+/* Application-specific. */
+
+#define NO	0
+#define YES	1
+
+/* deliver_alias - expand alias file entry */
+
+int     deliver_alias(LOCAL_STATE state, USER_ATTR usr_attr,
+		              char *name, int *statusp)
+{
+    const char *myname = "deliver_alias";
+    const char *alias_result;
+    char   *saved_alias_result;
+    char   *owner;
+    char  **cpp;
+    struct mypasswd *alias_pwd;
+    VSTRING *canon_owner;
+    DICT   *dict;
+    const char *owner_rhs;		/* owner alias, RHS */
+    int     alias_count;
+    int     dsn_notify;
+    char   *dsn_envid;
+    int     dsn_ret;
+    const char *dsn_orcpt;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * DUPLICATE/LOOP ELIMINATION
+     * 
+     * We cannot do duplicate elimination here. Sendmail compatibility requires
+     * that we allow multiple deliveries to the same alias, even recursively!
+     * For example, we must deliver to mailbox any messages that are addressed
+     * to the alias of a user that lists that same alias in her own .forward
+     * file. Yuck! This is just an example of some really perverse semantics
+     * that people will expect Postfix to implement just like sendmail.
+     * 
+     * We can recognize one special case: when an alias includes its own name,
+     * deliver to the user instead, just like sendmail. Otherwise, we just
+     * bail out when nesting reaches some unreasonable depth, and blame it on
+     * a possible alias loop.
+     */
+    if (state.msg_attr.exp_from != 0
+	&& strcasecmp_utf8(state.msg_attr.exp_from, name) == 0)
+	return (NO);
+    if (state.level > 100) {
+	msg_warn("alias database loop for %s", name);
+	dsb_simple(state.msg_attr.why, "5.4.6",
+		   "alias database loop for %s", name);
+	*statusp = bounce_append(BOUNCE_FLAGS(state.request),
+				 BOUNCE_ATTR(state.msg_attr));
+	return (YES);
+    }
+    state.msg_attr.exp_from = name;
+
+    /*
+     * There are a bunch of roles that we're trying to keep track of.
+     * 
+     * First, there's the issue of whose rights should be used when delivering
+     * to "|command" or to /file/name. With alias databases, the rights are
+     * those of who owns the alias, i.e. the database owner. With aliases
+     * owned by root, a default user is used instead. When an alias with
+     * default rights references an include file owned by an ordinary user,
+     * we must use the rights of the include file owner, otherwise the
+     * include file owner could take control of the default account.
+     * 
+     * Secondly, there's the question of who to notify of delivery problems.
+     * With aliases that have an owner- alias, the latter is used to set the
+     * sender and owner attributes. Otherwise, the owner attribute is reset
+     * (the alias is globally visible and could be sent to by anyone).
+     */
+    for (cpp = alias_maps->argv->argv; *cpp; cpp++) {
+	if ((dict = dict_handle(*cpp)) == 0)
+	    msg_panic("%s: dictionary not found: %s", myname, *cpp);
+	if ((alias_result = dict_get(dict, name)) != 0) {
+	    if (msg_verbose)
+		msg_info("%s: %s: %s = %s", myname, *cpp, name, alias_result);
+
+	    /*
+	     * Don't expand a verify-only request.
+	     */
+	    if (state.request->flags & DEL_REQ_FLAG_MTA_VRFY) {
+		dsb_simple(state.msg_attr.why, "2.0.0",
+			   "aliased to %s", alias_result);
+		*statusp = sent(BOUNCE_FLAGS(state.request),
+				SENT_ATTR(state.msg_attr));
+		return (YES);
+	    }
+
+	    /*
+	     * DELIVERY POLICY
+	     * 
+	     * Update the expansion type attribute, so we can decide if
+	     * deliveries to |command and /file/name are allowed at all.
+	     */
+	    state.msg_attr.exp_type = EXPAND_TYPE_ALIAS;
+
+	    /*
+	     * DELIVERY RIGHTS
+	     * 
+	     * What rights to use for |command and /file/name deliveries? The
+	     * command and file code will use default rights when the alias
+	     * database is owned by root, otherwise it will use the rights of
+	     * the alias database owner.
+	     */
+	    if (dict->owner.status == DICT_OWNER_TRUSTED) {
+		alias_pwd = 0;
+		RESET_USER_ATTR(usr_attr, state.level);
+	    } else {
+		if (dict->owner.status == DICT_OWNER_UNKNOWN) {
+		    msg_warn("%s: no owner UID for alias database %s",
+			     myname, *cpp);
+		    dsb_simple(state.msg_attr.why, "4.3.0",
+			       "mail system configuration error");
+		    *statusp = defer_append(BOUNCE_FLAGS(state.request),
+					    BOUNCE_ATTR(state.msg_attr));
+		    return (YES);
+		}
+		if ((errno = mypwuid_err(dict->owner.uid, &alias_pwd)) != 0
+		    || alias_pwd == 0) {
+		    msg_warn(errno ?
+			     "cannot find alias database owner for %s: %m" :
+			   "cannot find alias database owner for %s", *cpp);
+		    dsb_simple(state.msg_attr.why, "4.3.0",
+			       "cannot find alias database owner");
+		    *statusp = defer_append(BOUNCE_FLAGS(state.request),
+					    BOUNCE_ATTR(state.msg_attr));
+		    return (YES);
+		}
+		SET_USER_ATTR(usr_attr, alias_pwd, state.level);
+	    }
+
+	    /*
+	     * WHERE TO REPORT DELIVERY PROBLEMS.
+	     * 
+	     * Use the owner- alias if one is specified, otherwise reset the
+	     * owner attribute and use the include file ownership if we can.
+	     * Save the dict_lookup() result before something clobbers it.
+	     * 
+	     * Don't match aliases that are based on regexps.
+	     */
+#define OWNER_ASSIGN(own) \
+	    (own = (var_ownreq_special == 0 ? 0 : \
+	    concatenate("owner-", name, (char *) 0)))
+
+	    saved_alias_result = mystrdup(alias_result);
+	    if (OWNER_ASSIGN(owner) != 0
+		&& (owner_rhs = maps_find(alias_maps, owner, DICT_FLAG_NONE)) != 0) {
+		canon_owner = canon_addr_internal(vstring_alloc(10),
+				     var_exp_own_alias ? owner_rhs : owner);
+		/* Set envelope sender and owner attribute. */
+		SET_OWNER_ATTR(state.msg_attr, STR(canon_owner), state.level);
+	    } else {
+		canon_owner = 0;
+		/* Note: this does not reset the envelope sender. */
+		if (var_reset_owner_attr)
+		    RESET_OWNER_ATTR(state.msg_attr, state.level);
+	    }
+
+	    /*
+	     * EXTERNAL LOOP CONTROL
+	     * 
+	     * Set the delivered message attribute to the recipient, so that
+	     * this message will list the correct forwarding address.
+	     */
+	    if (var_frozen_delivered == 0)
+		state.msg_attr.delivered = state.msg_attr.rcpt.address;
+
+	    /*
+	     * Deliver.
+	     */
+	    alias_count = 0;
+	    if (owner != 0 && alias_maps->error != 0) {
+		dsb_simple(state.msg_attr.why, "4.3.0",
+			   "alias database unavailable");
+		*statusp = defer_append(BOUNCE_FLAGS(state.request),
+					BOUNCE_ATTR(state.msg_attr));
+	    } else {
+
+		/*
+		 * XXX DSN
+		 * 
+		 * When delivering to a mailing list (i.e. the envelope sender
+		 * is replaced) the ENVID, NOTIFY, RET, and ORCPT parameters
+		 * which accompany the redistributed message MUST NOT be
+		 * derived from those of the original message.
+		 * 
+		 * When delivering to an alias (i.e. the envelope sender is not
+		 * replaced) any ENVID, RET, or ORCPT parameters are
+		 * propagated to all forwarding addresses associated with
+		 * that alias.  The NOTIFY parameter is propagated to the
+		 * forwarding addresses, except that any SUCCESS keyword is
+		 * removed.
+		 */
+#define DSN_SAVE_UPDATE(saved, old, new) do { \
+	saved = old; \
+	old = new; \
+    } while (0)
+
+		DSN_SAVE_UPDATE(dsn_notify, state.msg_attr.rcpt.dsn_notify,
+				dsn_notify == DSN_NOTIFY_SUCCESS ?
+				DSN_NOTIFY_NEVER :
+				dsn_notify & ~DSN_NOTIFY_SUCCESS);
+		if (canon_owner != 0) {
+		    DSN_SAVE_UPDATE(dsn_envid, state.msg_attr.dsn_envid, "");
+		    DSN_SAVE_UPDATE(dsn_ret, state.msg_attr.dsn_ret, 0);
+		    DSN_SAVE_UPDATE(dsn_orcpt, state.msg_attr.rcpt.dsn_orcpt, "");
+		    state.msg_attr.rcpt.orig_addr = "";
+		}
+		*statusp =
+		    deliver_token_string(state, usr_attr, saved_alias_result,
+					 &alias_count);
+#if 0
+		if (var_ownreq_special
+		    && strncmp("owner-", state.msg_attr.sender, 6) != 0
+		    && alias_count > 10)
+		    msg_warn("mailing list \"%s\" needs an \"owner-%s\" alias",
+			     name, name);
+#endif
+		if (alias_count < 1) {
+		    msg_warn("no recipient in alias lookup result for %s", name);
+		    dsb_simple(state.msg_attr.why, "4.3.0",
+			       "alias database unavailable");
+		    *statusp = defer_append(BOUNCE_FLAGS(state.request),
+					    BOUNCE_ATTR(state.msg_attr));
+		} else {
+
+		    /*
+		     * XXX DSN
+		     * 
+		     * When delivering to a mailing list (i.e. the envelope
+		     * sender address is replaced) and NOTIFY=SUCCESS was
+		     * specified, report a DSN of "delivered".
+		     * 
+		     * When delivering to an alias (i.e. the envelope sender
+		     * address is not replaced) and NOTIFY=SUCCESS was
+		     * specified, report a DSN of "expanded".
+		     */
+		    if (dsn_notify & DSN_NOTIFY_SUCCESS) {
+			state.msg_attr.rcpt.dsn_notify = dsn_notify;
+			if (canon_owner != 0) {
+			    state.msg_attr.dsn_envid = dsn_envid;
+			    state.msg_attr.dsn_ret = dsn_ret;
+			    state.msg_attr.rcpt.dsn_orcpt = dsn_orcpt;
+			}
+			dsb_update(state.msg_attr.why, "2.0.0", canon_owner ?
+				   "delivered" : "expanded",
+				   DSB_SKIP_RMTA, DSB_SKIP_REPLY,
+				   "alias expanded");
+			(void) trace_append(BOUNCE_FLAG_NONE,
+					    SENT_ATTR(state.msg_attr));
+		    }
+		}
+	    }
+	    myfree(saved_alias_result);
+	    if (owner)
+		myfree(owner);
+	    if (canon_owner)
+		vstring_free(canon_owner);
+	    if (alias_pwd)
+		mypwfree(alias_pwd);
+	    return (YES);
+	}
+
+	/*
+	 * If the alias database was inaccessible for some reason, defer
+	 * further delivery for the current top-level recipient.
+	 */
+	if (alias_result == 0 && dict->error != 0) {
+	    msg_warn("%s:%s: lookup of '%s' failed",
+		     dict->type, dict->name, name);
+	    dsb_simple(state.msg_attr.why, "4.3.0",
+		       "alias database unavailable");
+	    *statusp = defer_append(BOUNCE_FLAGS(state.request),
+				    BOUNCE_ATTR(state.msg_attr));
+	    return (YES);
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: %s: %s not found", myname, *cpp, name);
+	}
+    }
+
+    /*
+     * Try delivery to a local user instead.
+     */
+    return (NO);
+}