Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 251 insertions, 0 deletions

diff --git a/src/local/command.c b/src/local/command.c
new file mode 100644
index 0000000..4781daf
--- /dev/null
+++ b/src/local/command.c
@@ -0,0 +1,251 @@
+/*++
+/* NAME
+/*	command 3
+/* SUMMARY
+/*	message delivery to shell command
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	deliver_command(state, usr_attr, command)
+/*	LOCAL_STATE state;
+/*	USER_ATTR exp_attr;
+/*	const char *command;
+/* DESCRIPTION
+/*	deliver_command() runs a command with a message as standard
+/*	input.  A limited amount of standard output and standard error
+/*	output is captured for diagnostics purposes.
+/*	Duplicate commands for the same recipient are suppressed.
+/*	A limited amount of information is exported via the environment:
+/*	HOME, SHELL, LOGNAME, USER, EXTENSION, DOMAIN, RECIPIENT (entire
+/*	address) LOCAL (just the local part) and SENDER. The exported
+/*	information is censored with var_cmd_filter.
+/*
+/*	Arguments:
+/* .IP state
+/*	The attributes that specify the message, recipient and more.
+/*	Attributes describing the 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 command
+/*	The shell command to be executed. If possible, the command is
+/*	executed without actually invoking a shell. if the command is
+/*	the mailbox_command, it is subjected to $name expansion.
+/* DIAGNOSTICS
+/*	deliver_command() returns non-zero when delivery should be
+/*	tried again,
+/* SEE ALSO
+/*	mailbox(3) deliver to mailbox
+/* 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 <unistd.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <htable.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <argv.h>
+#include <mac_parse.h>
+
+/* Global library. */
+
+#include <defer.h>
+#include <bounce.h>
+#include <sent.h>
+#include <been_here.h>
+#include <mail_params.h>
+#include <pipe_command.h>
+#include <mail_copy.h>
+#include <dsn_util.h>
+#include <mail_parm_split.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+/* deliver_command - deliver to shell command */
+
+int     deliver_command(LOCAL_STATE state, USER_ATTR usr_attr, const char *command)
+{
+    const char *myname = "deliver_command";
+    DSN_BUF *why = state.msg_attr.why;
+    int     cmd_status;
+    int     deliver_status;
+    ARGV   *env;
+    int     copy_flags;
+    char  **cpp;
+    char   *cp;
+    ARGV   *export_env;
+    VSTRING *exec_dir;
+    int     expand_status;
+
+    /*
+     * Make verbose logging easier to understand.
+     */
+    state.level++;
+    if (msg_verbose)
+	MSG_LOG_STATE(myname, state);
+
+    /*
+     * DUPLICATE ELIMINATION
+     * 
+     * Skip this command if it was already delivered to as this user.
+     */
+    if (been_here(state.dup_filter, "command %s:%ld %s",
+		  state.msg_attr.user, (long) usr_attr.uid, command))
+	return (0);
+
+    /*
+     * Don't deliver a trace-only request.
+     */
+    if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
+	dsb_simple(why, "2.0.0", "delivers to command: %s", command);
+	return (sent(BOUNCE_FLAGS(state.request),
+		     SENT_ATTR(state.msg_attr)));
+    }
+
+    /*
+     * DELIVERY RIGHTS
+     * 
+     * Choose a default uid and gid when none have been selected (i.e. values
+     * are still zero).
+     */
+    if (usr_attr.uid == 0 && (usr_attr.uid = var_default_uid) == 0)
+	msg_panic("privileged default user id");
+    if (usr_attr.gid == 0 && (usr_attr.gid = var_default_gid) == 0)
+	msg_panic("privileged default group id");
+
+    /*
+     * Deliver.
+     */
+    copy_flags = MAIL_COPY_FROM | MAIL_COPY_RETURN_PATH
+	| MAIL_COPY_ORIG_RCPT;
+    if (local_deliver_hdr_mask & DELIVER_HDR_CMD)
+	copy_flags |= MAIL_COPY_DELIVERED;
+
+    if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
+	msg_fatal("%s: seek queue file %s: %m",
+		  myname, VSTREAM_PATH(state.msg_attr.fp));
+
+    /*
+     * Pass additional environment information. XXX This should be
+     * configurable. However, passing untrusted information via environment
+     * parameters opens up a whole can of worms. Lesson from web servers:
+     * don't let any network data even near a shell. It causes trouble.
+     */
+    env = argv_alloc(1);
+    if (usr_attr.home)
+	argv_add(env, "HOME", usr_attr.home, ARGV_END);
+    argv_add(env,
+	     "LOGNAME", state.msg_attr.user,
+	     "USER", state.msg_attr.user,
+	     "SENDER", state.msg_attr.sender,
+	     "RECIPIENT", state.msg_attr.rcpt.address,
+	     "LOCAL", state.msg_attr.local,
+	     ARGV_END);
+    if (usr_attr.shell)
+	argv_add(env, "SHELL", usr_attr.shell, ARGV_END);
+    if (state.msg_attr.domain)
+	argv_add(env, "DOMAIN", state.msg_attr.domain, ARGV_END);
+    if (state.msg_attr.extension)
+	argv_add(env, "EXTENSION", state.msg_attr.extension, ARGV_END);
+    if (state.msg_attr.rcpt.orig_addr && state.msg_attr.rcpt.orig_addr[0])
+	argv_add(env, "ORIGINAL_RECIPIENT", state.msg_attr.rcpt.orig_addr,
+		 ARGV_END);
+
+#define EXPORT_REQUEST(name, value) \
+	if ((value)[0]) argv_add(env, (name), (value), ARGV_END);
+
+    EXPORT_REQUEST("CLIENT_HOSTNAME", state.msg_attr.request->client_name);
+    EXPORT_REQUEST("CLIENT_ADDRESS", state.msg_attr.request->client_addr);
+    EXPORT_REQUEST("CLIENT_HELO", state.msg_attr.request->client_helo);
+    EXPORT_REQUEST("CLIENT_PROTOCOL", state.msg_attr.request->client_proto);
+    EXPORT_REQUEST("SASL_METHOD", state.msg_attr.request->sasl_method);
+    EXPORT_REQUEST("SASL_SENDER", state.msg_attr.request->sasl_sender);
+    EXPORT_REQUEST("SASL_USERNAME", state.msg_attr.request->sasl_username);
+
+    argv_terminate(env);
+
+    /*
+     * Censor out undesirable characters from exported data.
+     */
+    for (cpp = env->argv; *cpp; cpp += 2)
+	for (cp = cpp[1]; *(cp += strspn(cp, var_cmd_exp_filter)) != 0;)
+	    *cp++ = '_';
+
+    /*
+     * Evaluate the command execution directory. Defer delivery if expansion
+     * fails.
+     */
+    export_env = mail_parm_split(VAR_EXPORT_ENVIRON, var_export_environ);
+    exec_dir = vstring_alloc(10);
+    expand_status = local_expand(exec_dir, var_exec_directory,
+				 &state, &usr_attr, var_exec_exp_filter);
+
+    if (expand_status & MAC_PARSE_ERROR) {
+	cmd_status = PIPE_STAT_DEFER;
+	dsb_simple(why, "4.3.5", "mail system configuration error");
+	msg_warn("bad parameter value syntax for %s: %s",
+		 VAR_EXEC_DIRECTORY, var_exec_directory);
+    } else {
+	cmd_status = pipe_command(state.msg_attr.fp, why,
+				  CA_PIPE_CMD_UID(usr_attr.uid),
+				  CA_PIPE_CMD_GID(usr_attr.gid),
+				  CA_PIPE_CMD_COMMAND(command),
+				  CA_PIPE_CMD_COPY_FLAGS(copy_flags),
+				  CA_PIPE_CMD_SENDER(state.msg_attr.sender),
+		       CA_PIPE_CMD_ORIG_RCPT(state.msg_attr.rcpt.orig_addr),
+			    CA_PIPE_CMD_DELIVERED(state.msg_attr.delivered),
+				CA_PIPE_CMD_TIME_LIMIT(var_command_maxtime),
+				  CA_PIPE_CMD_ENV(env->argv),
+				  CA_PIPE_CMD_EXPORT(export_env->argv),
+				  CA_PIPE_CMD_SHELL(var_local_cmd_shell),
+				  CA_PIPE_CMD_CWD(*STR(exec_dir) ?
+						STR(exec_dir) : (char *) 0),
+				  CA_PIPE_CMD_END);
+    }
+    vstring_free(exec_dir);
+    argv_free(export_env);
+    argv_free(env);
+
+    /*
+     * Depending on the result, bounce or defer the message.
+     */
+    switch (cmd_status) {
+    case PIPE_STAT_OK:
+	dsb_simple(why, "2.0.0", "delivered to command: %s", command);
+	deliver_status = sent(BOUNCE_FLAGS(state.request),
+			      SENT_ATTR(state.msg_attr));
+	break;
+    case PIPE_STAT_BOUNCE:
+    case PIPE_STAT_DEFER:
+	/* Account for possible owner- sender address override. */
+	deliver_status = bounce_workaround(state);
+	break;
+    case PIPE_STAT_CORRUPT:
+	deliver_status = DEL_STAT_DEFER;
+	break;
+    default:
+	msg_panic("%s: bad status %d", myname, cmd_status);
+	/* NOTREACHED */
+    }
+
+    return (deliver_status);
+}