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-rw-r--r--src/cleanup/cleanup_message.c1094
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diff --git a/src/cleanup/cleanup_message.c b/src/cleanup/cleanup_message.c
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+++ b/src/cleanup/cleanup_message.c
@@ -0,0 +1,1094 @@
+/*++
+/* NAME
+/* cleanup_message 3
+/* SUMMARY
+/* process message segment
+/* SYNOPSIS
+/* #include "cleanup.h"
+/*
+/* void cleanup_message(state, type, buf, len)
+/* CLEANUP_STATE *state;
+/* int type;
+/* const char *buf;
+/* ssize_t len;
+/* DESCRIPTION
+/* This module processes message content records and copies the
+/* result to the queue file. It validates the input, rewrites
+/* sender/recipient addresses to canonical form, inserts missing
+/* message headers, and extracts information from message headers
+/* to be used later when generating the extracted output segment.
+/* This routine absorbs but does not emit the content to extracted
+/* boundary record.
+/*
+/* Arguments:
+/* .IP state
+/* Queue file and message processing state. This state is updated
+/* as records are processed and as errors happen.
+/* .IP type
+/* Record type.
+/* .IP buf
+/* Record content.
+/* .IP len
+/* Record content length.
+/* 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 <ctype.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <argv.h>
+#include <split_at.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <nvtable.h>
+
+/* Global library. */
+
+#include <record.h>
+#include <rec_type.h>
+#include <cleanup_user.h>
+#include <tok822.h>
+#include <lex_822.h>
+#include <header_opts.h>
+#include <quote_822_local.h>
+#include <mail_params.h>
+#include <mail_date.h>
+#include <mail_addr.h>
+#include <is_header.h>
+#include <ext_prop.h>
+#include <mail_proto.h>
+#include <mime_state.h>
+#include <lex_822.h>
+#include <dsn_util.h>
+#include <conv_time.h>
+
+/* Application-specific. */
+
+#include "cleanup.h"
+
+/* cleanup_fold_header - wrap address list header */
+
+static void cleanup_fold_header(CLEANUP_STATE *state, VSTRING *header_buf)
+{
+ char *start_line = vstring_str(header_buf);
+ char *end_line;
+ char *next_line;
+ char *line;
+
+ /*
+ * A rewritten address list contains one address per line. The code below
+ * replaces newlines by spaces, to fit as many addresses on a line as
+ * possible (without rearranging the order of addresses). Prepending
+ * white space to the beginning of lines is delegated to the output
+ * routine.
+ */
+ for (line = start_line; line != 0; line = next_line) {
+ end_line = line + strcspn(line, "\n");
+ if (line > start_line) {
+ if (end_line - start_line < 70) { /* TAB counts as one */
+ line[-1] = ' ';
+ } else {
+ start_line = line;
+ }
+ }
+ next_line = *end_line ? end_line + 1 : 0;
+ }
+ cleanup_out_header(state, header_buf);
+}
+
+/* cleanup_extract_internal - save unquoted copy of extracted address */
+
+static char *cleanup_extract_internal(VSTRING *buffer, TOK822 *addr)
+{
+
+ /*
+ * A little routine to stash away a copy of an address that we extracted
+ * from a message header line.
+ */
+ tok822_internalize(buffer, addr->head, TOK822_STR_DEFL);
+ return (mystrdup(vstring_str(buffer)));
+}
+
+/* cleanup_rewrite_sender - sender address rewriting */
+
+static void cleanup_rewrite_sender(CLEANUP_STATE *state,
+ const HEADER_OPTS *hdr_opts,
+ VSTRING *header_buf)
+{
+ TOK822 *tree;
+ TOK822 **addr_list;
+ TOK822 **tpp;
+ int did_rewrite = 0;
+
+ if (msg_verbose)
+ msg_info("rewrite_sender: %s", hdr_opts->name);
+
+ /*
+ * Parse the header line, rewrite each address found, and regenerate the
+ * header line. Finally, pipe the result through the header line folding
+ * routine.
+ */
+ tree = tok822_parse_limit(vstring_str(header_buf)
+ + strlen(hdr_opts->name) + 1,
+ var_token_limit);
+ addr_list = tok822_grep(tree, TOK822_ADDR);
+ for (tpp = addr_list; *tpp; tpp++) {
+ did_rewrite |= cleanup_rewrite_tree(state->hdr_rewrite_context, *tpp);
+ if (state->flags & CLEANUP_FLAG_MAP_OK) {
+ if (cleanup_send_canon_maps
+ && (cleanup_send_canon_flags & CLEANUP_CANON_FLAG_HDR_FROM))
+ did_rewrite |=
+ cleanup_map11_tree(state, *tpp, cleanup_send_canon_maps,
+ cleanup_ext_prop_mask & EXT_PROP_CANONICAL);
+ if (cleanup_comm_canon_maps
+ && (cleanup_comm_canon_flags & CLEANUP_CANON_FLAG_HDR_FROM))
+ did_rewrite |=
+ cleanup_map11_tree(state, *tpp, cleanup_comm_canon_maps,
+ cleanup_ext_prop_mask & EXT_PROP_CANONICAL);
+ if (cleanup_masq_domains
+ && (cleanup_masq_flags & CLEANUP_MASQ_FLAG_HDR_FROM))
+ did_rewrite |=
+ cleanup_masquerade_tree(state, *tpp, cleanup_masq_domains);
+ }
+ }
+ if (did_rewrite) {
+ vstring_truncate(header_buf, strlen(hdr_opts->name));
+ vstring_strcat(header_buf, ": ");
+ tok822_externalize(header_buf, tree, TOK822_STR_HEAD);
+ }
+ myfree((void *) addr_list);
+ tok822_free_tree(tree);
+ if ((hdr_opts->flags & HDR_OPT_DROP) == 0) {
+ if (did_rewrite)
+ cleanup_fold_header(state, header_buf);
+ else
+ cleanup_out_header(state, header_buf);
+ }
+}
+
+/* cleanup_rewrite_recip - recipient address rewriting */
+
+static void cleanup_rewrite_recip(CLEANUP_STATE *state,
+ const HEADER_OPTS *hdr_opts,
+ VSTRING *header_buf)
+{
+ TOK822 *tree;
+ TOK822 **addr_list;
+ TOK822 **tpp;
+ int did_rewrite = 0;
+
+ if (msg_verbose)
+ msg_info("rewrite_recip: %s", hdr_opts->name);
+
+ /*
+ * Parse the header line, rewrite each address found, and regenerate the
+ * header line. Finally, pipe the result through the header line folding
+ * routine.
+ */
+ tree = tok822_parse_limit(vstring_str(header_buf)
+ + strlen(hdr_opts->name) + 1,
+ var_token_limit);
+ addr_list = tok822_grep(tree, TOK822_ADDR);
+ for (tpp = addr_list; *tpp; tpp++) {
+ did_rewrite |= cleanup_rewrite_tree(state->hdr_rewrite_context, *tpp);
+ if (state->flags & CLEANUP_FLAG_MAP_OK) {
+ if (cleanup_rcpt_canon_maps
+ && (cleanup_rcpt_canon_flags & CLEANUP_CANON_FLAG_HDR_RCPT))
+ did_rewrite |=
+ cleanup_map11_tree(state, *tpp, cleanup_rcpt_canon_maps,
+ cleanup_ext_prop_mask & EXT_PROP_CANONICAL);
+ if (cleanup_comm_canon_maps
+ && (cleanup_comm_canon_flags & CLEANUP_CANON_FLAG_HDR_RCPT))
+ did_rewrite |=
+ cleanup_map11_tree(state, *tpp, cleanup_comm_canon_maps,
+ cleanup_ext_prop_mask & EXT_PROP_CANONICAL);
+ if (cleanup_masq_domains
+ && (cleanup_masq_flags & CLEANUP_MASQ_FLAG_HDR_RCPT))
+ did_rewrite |=
+ cleanup_masquerade_tree(state, *tpp, cleanup_masq_domains);
+ }
+ }
+ if (did_rewrite) {
+ vstring_truncate(header_buf, strlen(hdr_opts->name));
+ vstring_strcat(header_buf, ": ");
+ tok822_externalize(header_buf, tree, TOK822_STR_HEAD);
+ }
+ myfree((void *) addr_list);
+ tok822_free_tree(tree);
+ if ((hdr_opts->flags & HDR_OPT_DROP) == 0) {
+ if (did_rewrite)
+ cleanup_fold_header(state, header_buf);
+ else
+ cleanup_out_header(state, header_buf);
+ }
+}
+
+/* cleanup_act_log - log action with context */
+
+static void cleanup_act_log(CLEANUP_STATE *state,
+ const char *action, const char *class,
+ const char *content, const char *text)
+{
+ const char *attr;
+
+ if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_ORIGIN)) == 0)
+ attr = "unknown";
+ vstring_sprintf(state->temp1, "%s: %s: %s %.200s from %s;",
+ state->queue_id, action, class, content, attr);
+ if (state->sender)
+ vstring_sprintf_append(state->temp1, " from=<%s>", state->sender);
+ if (state->recip)
+ vstring_sprintf_append(state->temp1, " to=<%s>", state->recip);
+ if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_PROTO_NAME)) != 0)
+ vstring_sprintf_append(state->temp1, " proto=%s", attr);
+ if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_HELO_NAME)) != 0)
+ vstring_sprintf_append(state->temp1, " helo=<%s>", attr);
+ if (text && *text)
+ vstring_sprintf_append(state->temp1, ": %s", text);
+ msg_info("%s", vstring_str(state->temp1));
+}
+
+#define CLEANUP_ACT_CTXT_HEADER "header"
+#define CLEANUP_ACT_CTXT_BODY "body"
+#define CLEANUP_ACT_CTXT_ANY "content"
+
+/* cleanup_act - act upon a header/body match */
+
+static const char *cleanup_act(CLEANUP_STATE *state, char *context,
+ const char *buf, const char *value,
+ const char *map_class)
+{
+ const char *optional_text = value + strcspn(value, " \t");
+ int command_len = optional_text - value;
+
+#ifdef DELAY_ACTION
+ int defer_delay;
+
+#endif
+
+ while (*optional_text && ISSPACE(*optional_text))
+ optional_text++;
+
+#define STREQUAL(x,y,l) (strncasecmp((x), (y), (l)) == 0 && (y)[l] == 0)
+#define CLEANUP_ACT_DROP 0
+
+ /*
+ * CLEANUP_STAT_CONT and CLEANUP_STAT_DEFER both update the reason
+ * attribute, but CLEANUP_STAT_DEFER takes precedence. It terminates
+ * queue record processing, and prevents bounces from being sent.
+ */
+ if (STREQUAL(value, "REJECT", command_len)) {
+ const CLEANUP_STAT_DETAIL *detail;
+
+ if (state->reason)
+ myfree(state->reason);
+ if (*optional_text) {
+ state->reason = dsn_prepend("5.7.1", optional_text);
+ if (*state->reason != '4' && *state->reason != '5') {
+ msg_warn("bad DSN action in %s -- need 4.x.x or 5.x.x",
+ optional_text);
+ *state->reason = '4';
+ }
+ } else {
+ detail = cleanup_stat_detail(CLEANUP_STAT_CONT);
+ state->reason = dsn_prepend(detail->dsn, detail->text);
+ }
+ if (*state->reason == '4')
+ state->errs |= CLEANUP_STAT_DEFER;
+ else
+ state->errs |= CLEANUP_STAT_CONT;
+ state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
+ cleanup_act_log(state, "reject", context, buf, state->reason);
+ return (buf);
+ }
+ if (STREQUAL(value, "WARN", command_len)) {
+ cleanup_act_log(state, "warning", context, buf, optional_text);
+ return (buf);
+ }
+ if (STREQUAL(value, "INFO", command_len)) {
+ cleanup_act_log(state, "info", context, buf, optional_text);
+ return (buf);
+ }
+ if (STREQUAL(value, "FILTER", command_len)) {
+ if (*optional_text == 0) {
+ msg_warn("missing FILTER command argument in %s map", map_class);
+ } else if (strchr(optional_text, ':') == 0) {
+ msg_warn("bad FILTER command %s in %s -- "
+ "need transport:destination",
+ optional_text, map_class);
+ } else {
+ if (state->filter)
+ myfree(state->filter);
+ state->filter = mystrdup(optional_text);
+ cleanup_act_log(state, "filter", context, buf, optional_text);
+ }
+ return (buf);
+ }
+ if (STREQUAL(value, "PASS", command_len)) {
+ cleanup_act_log(state, "pass", context, buf, optional_text);
+ state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
+ return (buf);
+ }
+ if (STREQUAL(value, "DISCARD", command_len)) {
+ cleanup_act_log(state, "discard", context, buf, optional_text);
+ state->flags |= CLEANUP_FLAG_DISCARD;
+ state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
+ return (buf);
+ }
+ if (STREQUAL(value, "HOLD", command_len)) {
+ if ((state->flags & (CLEANUP_FLAG_HOLD | CLEANUP_FLAG_DISCARD)) == 0) {
+ cleanup_act_log(state, "hold", context, buf, optional_text);
+ state->flags |= CLEANUP_FLAG_HOLD;
+ }
+ return (buf);
+ }
+
+ /*
+ * The DELAY feature is disabled because it has too many problems. 1) It
+ * does not work on some remote file systems; 2) mail will be delivered
+ * anyway with "sendmail -q" etc.; 3) while the mail is queued it bogs
+ * down the deferred queue scan with huge amounts of useless disk I/O
+ * operations.
+ */
+#ifdef DELAY_ACTION
+ if (STREQUAL(value, "DELAY", command_len)) {
+ if ((state->flags & (CLEANUP_FLAG_HOLD | CLEANUP_FLAG_DISCARD)) == 0) {
+ if (*optional_text == 0) {
+ msg_warn("missing DELAY argument in %s map", map_class);
+ } else if (conv_time(optional_text, &defer_delay, 's') == 0) {
+ msg_warn("ignoring bad DELAY argument %s in %s map",
+ optional_text, map_class);
+ } else {
+ cleanup_act_log(state, "delay", context, buf, optional_text);
+ state->defer_delay = defer_delay;
+ }
+ }
+ return (buf);
+ }
+#endif
+ if (STREQUAL(value, "PREPEND", command_len)) {
+ if (*optional_text == 0) {
+ msg_warn("PREPEND action without text in %s map", map_class);
+ } else if (strcmp(context, CLEANUP_ACT_CTXT_HEADER) == 0) {
+ if (!is_header(optional_text)) {
+ msg_warn("bad PREPEND header text \"%s\" in %s map -- "
+ "need \"headername: headervalue\"",
+ optional_text, map_class);
+ }
+
+ /*
+ * By design, cleanup_out_header() may modify content. Play safe
+ * and prepare for future developments.
+ */
+ else {
+ VSTRING *temp;
+
+ cleanup_act_log(state, "prepend", context, buf, optional_text);
+ temp = vstring_strcpy(vstring_alloc(strlen(optional_text)),
+ optional_text);
+ cleanup_out_header(state, temp);
+ vstring_free(temp);
+ }
+ } else {
+ cleanup_act_log(state, "prepend", context, buf, optional_text);
+ cleanup_out_string(state, REC_TYPE_NORM, optional_text);
+ }
+ return (buf);
+ }
+ if (STREQUAL(value, "REPLACE", command_len)) {
+ if (*optional_text == 0) {
+ msg_warn("REPLACE action without text in %s map", map_class);
+ return (buf);
+ } else if (strcmp(context, CLEANUP_ACT_CTXT_HEADER) == 0
+ && !is_header(optional_text)) {
+ msg_warn("bad REPLACE header text \"%s\" in %s map -- "
+ "need \"headername: headervalue\"",
+ optional_text, map_class);
+ return (buf);
+ } else {
+ cleanup_act_log(state, "replace", context, buf, optional_text);
+ return (mystrdup(optional_text));
+ }
+ }
+ if (STREQUAL(value, "REDIRECT", command_len)) {
+ if (strchr(optional_text, '@') == 0) {
+ msg_warn("bad REDIRECT target \"%s\" in %s map -- "
+ "need user@domain",
+ optional_text, map_class);
+ } else {
+ if (state->redirect)
+ myfree(state->redirect);
+ state->redirect = mystrdup(optional_text);
+ cleanup_act_log(state, "redirect", context, buf, optional_text);
+ state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
+ }
+ return (buf);
+ }
+ if (STREQUAL(value, "BCC", command_len)) {
+ if (strchr(optional_text, '@') == 0) {
+ msg_warn("bad BCC address \"%s\" in %s map -- "
+ "need user@domain",
+ optional_text, map_class);
+ } else {
+ if (state->hbc_rcpt == 0)
+ state->hbc_rcpt = argv_alloc(1);
+ argv_add(state->hbc_rcpt, optional_text, (char *) 0);
+ cleanup_act_log(state, "bcc", context, buf, optional_text);
+ }
+ return (buf);
+ }
+ if (STREQUAL(value, "STRIP", command_len)) {
+ cleanup_act_log(state, "strip", context, buf, optional_text);
+ return (CLEANUP_ACT_DROP);
+ }
+ /* Allow and ignore optional text after the action. */
+
+ if (STREQUAL(value, "IGNORE", command_len))
+ return (CLEANUP_ACT_DROP);
+
+ if (STREQUAL(value, "DUNNO", command_len)) /* preferred */
+ return (buf);
+
+ if (STREQUAL(value, "OK", command_len)) /* compat */
+ return (buf);
+
+ msg_warn("unknown command in %s map: %s", map_class, value);
+ return (buf);
+}
+
+/* cleanup_header_callback - process one complete header line */
+
+static void cleanup_header_callback(void *context, int header_class,
+ const HEADER_OPTS *hdr_opts,
+ VSTRING *header_buf,
+ off_t unused_offset)
+{
+ CLEANUP_STATE *state = (CLEANUP_STATE *) context;
+ const char *myname = "cleanup_header_callback";
+ char *hdrval;
+ struct code_map {
+ const char *name;
+ const char *encoding;
+ };
+ static struct code_map code_map[] = { /* RFC 2045 */
+ "7bit", MAIL_ATTR_ENC_7BIT,
+ "8bit", MAIL_ATTR_ENC_8BIT,
+ "binary", MAIL_ATTR_ENC_8BIT, /* XXX Violation */
+ "quoted-printable", MAIL_ATTR_ENC_7BIT,
+ "base64", MAIL_ATTR_ENC_7BIT,
+ 0,
+ };
+ struct code_map *cmp;
+ MAPS *checks;
+ const char *map_class;
+
+ if (msg_verbose)
+ msg_info("%s: '%.200s'", myname, vstring_str(header_buf));
+
+ /*
+ * Crude header filtering. This stops malware that isn't sophisticated
+ * enough to use fancy header encodings.
+ */
+#define CHECK(class, maps, var_name) \
+ (header_class == class && (map_class = var_name, checks = maps) != 0)
+
+ if (hdr_opts && (hdr_opts->flags & HDR_OPT_MIME))
+ header_class = MIME_HDR_MULTIPART;
+
+ /* Update the Received: header count before maybe dropping headers below. */
+ if (hdr_opts && hdr_opts->type == HDR_RECEIVED)
+ state->hop_count += 1;
+
+ if ((state->flags & CLEANUP_FLAG_FILTER)
+ && (CHECK(MIME_HDR_PRIMARY, cleanup_header_checks, VAR_HEADER_CHECKS)
+ || CHECK(MIME_HDR_MULTIPART, cleanup_mimehdr_checks, VAR_MIMEHDR_CHECKS)
+ || CHECK(MIME_HDR_NESTED, cleanup_nesthdr_checks, VAR_NESTHDR_CHECKS))) {
+ char *header = vstring_str(header_buf);
+ const char *value;
+
+ if ((value = maps_find(checks, header, 0)) != 0) {
+ const char *result;
+
+ if ((result = cleanup_act(state, CLEANUP_ACT_CTXT_HEADER,
+ header, value, map_class))
+ == CLEANUP_ACT_DROP) {
+ return;
+ } else if (result != header) {
+ vstring_strcpy(header_buf, result);
+ hdr_opts = header_opts_find(result);
+ myfree((void *) result);
+ }
+ } else if (checks->error) {
+ msg_warn("%s: %s map lookup problem -- "
+ "message not accepted, try again later",
+ state->queue_id, checks->title);
+ state->errs |= CLEANUP_STAT_WRITE;
+ }
+ }
+
+ /*
+ * If this is an "unknown" header, just copy it to the output without
+ * even bothering to fold long lines. cleanup_out() will split long
+ * headers that do not fit a REC_TYPE_NORM record.
+ */
+ if (hdr_opts == 0) {
+ cleanup_out_header(state, header_buf);
+ return;
+ }
+
+ /*
+ * Allow 8-bit type info to override 7-bit type info. XXX Should reuse
+ * the effort that went into MIME header parsing.
+ */
+ hdrval = vstring_str(header_buf) + strlen(hdr_opts->name) + 1;
+ while (ISSPACE(*hdrval))
+ hdrval++;
+ /* trimblanks(hdrval, 0)[0] = 0; */
+ if (var_auto_8bit_enc_hdr
+ && hdr_opts->type == HDR_CONTENT_TRANSFER_ENCODING) {
+ for (cmp = code_map; cmp->name != 0; cmp++) {
+ if (strcasecmp(hdrval, cmp->name) == 0) {
+ if (strcasecmp(cmp->encoding, MAIL_ATTR_ENC_8BIT) == 0)
+ nvtable_update(state->attr, MAIL_ATTR_ENCODING,
+ cmp->encoding);
+ break;
+ }
+ }
+ }
+
+ /*
+ * Copy attachment etc. header blocks without further inspection.
+ */
+ if (header_class != MIME_HDR_PRIMARY) {
+ cleanup_out_header(state, header_buf);
+ return;
+ }
+
+ /*
+ * Known header. Remember that we have seen at least one. Find out what
+ * we should do with this header: delete, count, rewrite. Note that we
+ * should examine headers even when they will be deleted from the output,
+ * because the addresses in those headers might be needed elsewhere.
+ *
+ * XXX 2821: Return-path breakage.
+ *
+ * RFC 821 specifies: When the receiver-SMTP makes the "final delivery" of a
+ * message it inserts at the beginning of the mail data a return path
+ * line. The return path line preserves the information in the
+ * <reverse-path> from the MAIL command. Here, final delivery means the
+ * message leaves the SMTP world. Normally, this would mean it has been
+ * delivered to the destination user, but in some cases it may be further
+ * processed and transmitted by another mail system.
+ *
+ * And that is what Postfix implements. Delivery agents prepend
+ * Return-Path:. In order to avoid cluttering up the message with
+ * possibly inconsistent Return-Path: information (the sender can change
+ * as the result of mail forwarding or mailing list delivery), Postfix
+ * removes any existing Return-Path: headers.
+ *
+ * RFC 2821 Section 4.4 specifies: A message-originating SMTP system
+ * SHOULD NOT send a message that already contains a Return-path header.
+ * SMTP servers performing a relay function MUST NOT inspect the message
+ * data, and especially not to the extent needed to determine if
+ * Return-path headers are present. SMTP servers making final delivery
+ * MAY remove Return-path headers before adding their own.
+ */
+ else {
+ state->headers_seen |= (1 << hdr_opts->type);
+ if (hdr_opts->type == HDR_MESSAGE_ID)
+ msg_info("%s: message-id=%s", state->queue_id, hdrval);
+ if (hdr_opts->type == HDR_RESENT_MESSAGE_ID)
+ msg_info("%s: resent-message-id=%s", state->queue_id, hdrval);
+ if (hdr_opts->type == HDR_RECEIVED) {
+ if (state->hop_count >= var_hopcount_limit) {
+ msg_warn("%s: message rejected: hopcount exceeded",
+ state->queue_id);
+ state->errs |= CLEANUP_STAT_HOPS;
+ }
+ /* Save our Received: header after maybe updating headers above. */
+ if (state->hop_count == 1)
+ argv_add(state->auto_hdrs, vstring_str(header_buf), ARGV_END);
+ }
+ if (CLEANUP_OUT_OK(state)) {
+ if (hdr_opts->flags & HDR_OPT_RR)
+ state->resent = "Resent-";
+ if ((hdr_opts->flags & HDR_OPT_SENDER)
+ && state->hdr_rewrite_context) {
+ cleanup_rewrite_sender(state, hdr_opts, header_buf);
+ } else if ((hdr_opts->flags & HDR_OPT_RECIP)
+ && state->hdr_rewrite_context) {
+ cleanup_rewrite_recip(state, hdr_opts, header_buf);
+ } else if ((hdr_opts->flags & HDR_OPT_DROP) == 0) {
+ cleanup_out_header(state, header_buf);
+ }
+ }
+ }
+}
+
+/* cleanup_header_done_callback - insert missing message headers */
+
+static void cleanup_header_done_callback(void *context)
+{
+ const char *myname = "cleanup_header_done_callback";
+ CLEANUP_STATE *state = (CLEANUP_STATE *) context;
+ char time_stamp[1024]; /* XXX locale dependent? */
+ struct tm *tp;
+ TOK822 *token;
+ TOK822 *dummy_token;
+ time_t tv;
+
+ /*
+ * XXX Workaround: when we reach the end of headers, mime_state_update()
+ * may execute up to three call-backs before returning to the caller:
+ * head_out(), head_end(), and body_out() or body_end(). As long as
+ * call-backs don't return a result, each call-back has to check for
+ * itself if the previous call-back experienced a problem.
+ */
+ if (CLEANUP_OUT_OK(state) == 0)
+ return;
+
+ /*
+ * Future proofing: the Milter client's header suppression algorithm
+ * assumes that the MTA prepends its own Received: header. This
+ * assupmtion may be violated after some source-code update. The
+ * following check ensures consistency, at least for local submission.
+ */
+ if (state->hop_count < 1) {
+ msg_warn("%s: message rejected: no Received: header",
+ state->queue_id);
+ state->errs |= CLEANUP_STAT_BAD;
+ return;
+ }
+
+ /*
+ * Add a missing (Resent-)Message-Id: header. The message ID gives the
+ * time in GMT units, plus the local queue ID.
+ *
+ * XXX Message-Id is not a required message header (RFC 822 and RFC 2822).
+ *
+ * XXX It is the queue ID non-inode bits that prevent messages from getting
+ * the same Message-Id within the same second.
+ *
+ * XXX An arbitrary amount of time may pass between the start of the mail
+ * transaction and the creation of a queue file. Since we guarantee queue
+ * ID uniqueness only within a second, we must ensure that the time in
+ * the message ID matches the queue ID creation time, as long as we use
+ * the queue ID in the message ID.
+ *
+ * XXX We log a dummy name=value record so that we (hopefully) don't break
+ * compatibility with existing logfile analyzers, and so that we don't
+ * complicate future code that wants to log more name=value attributes.
+ */
+ if ((state->hdr_rewrite_context || var_always_add_hdrs)
+ && (state->headers_seen & (1 << (state->resent[0] ?
+ HDR_RESENT_MESSAGE_ID : HDR_MESSAGE_ID))) == 0) {
+ if (var_long_queue_ids) {
+ vstring_sprintf(state->temp1, "%s@%s",
+ state->queue_id, var_myhostname);
+ } else {
+ tv = state->handle->ctime.tv_sec;
+ tp = gmtime(&tv);
+ strftime(time_stamp, sizeof(time_stamp), "%Y%m%d%H%M%S", tp);
+ vstring_sprintf(state->temp1, "%s.%s@%s",
+ time_stamp, state->queue_id, var_myhostname);
+ }
+ cleanup_out_format(state, REC_TYPE_NORM, "%sMessage-Id: <%s>",
+ state->resent, vstring_str(state->temp1));
+ msg_info("%s: %smessage-id=<%s>",
+ state->queue_id, *state->resent ? "resent-" : "",
+ vstring_str(state->temp1));
+ state->headers_seen |= (1 << (state->resent[0] ?
+ HDR_RESENT_MESSAGE_ID : HDR_MESSAGE_ID));
+ }
+ if ((state->headers_seen & (1 << HDR_MESSAGE_ID)) == 0)
+ msg_info("%s: message-id=<>", state->queue_id);
+
+ /*
+ * Add a missing (Resent-)Date: header. The date is in local time units,
+ * with the GMT offset at the end.
+ */
+ if ((state->hdr_rewrite_context || var_always_add_hdrs)
+ && (state->headers_seen & (1 << (state->resent[0] ?
+ HDR_RESENT_DATE : HDR_DATE))) == 0) {
+ cleanup_out_format(state, REC_TYPE_NORM, "%sDate: %s",
+ state->resent, mail_date(state->arrival_time.tv_sec));
+ }
+
+ /*
+ * Add a missing (Resent-)From: header.
+ */
+ if ((state->hdr_rewrite_context || var_always_add_hdrs)
+ && (state->headers_seen & (1 << (state->resent[0] ?
+ HDR_RESENT_FROM : HDR_FROM))) == 0) {
+ quote_822_local(state->temp1, *state->sender ?
+ state->sender : MAIL_ADDR_MAIL_DAEMON);
+ if (*state->sender && state->fullname && *state->fullname) {
+ char *cp;
+
+ /* Enforce some sanity on full name content. */
+ while ((cp = strchr(state->fullname, '\r')) != 0
+ || (cp = strchr(state->fullname, '\n')) != 0)
+ *cp = ' ';
+
+ switch (hfrom_format_code) {
+
+ /*
+ * "From: phrase <route-addr>". Quote the phrase if it
+ * contains specials or the "%!" legacy address operators.
+ */
+ case HFROM_FORMAT_CODE_STD:
+ vstring_sprintf(state->temp2, "%sFrom: ", state->resent);
+ if (state->fullname[strcspn(state->fullname,
+ "%!" LEX_822_SPECIALS)] == 0) {
+ /* Normalize whitespace. */
+ token = tok822_scan_limit(state->fullname, &dummy_token,
+ var_token_limit);
+ } else {
+ token = tok822_alloc(TOK822_QSTRING, state->fullname);
+ }
+ if (token) {
+ tok822_externalize(state->temp2, token, TOK822_STR_NONE);
+ tok822_free(token);
+ vstring_strcat(state->temp2, " ");
+ }
+ vstring_sprintf_append(state->temp2, "<%s>",
+ vstring_str(state->temp1));
+ break;
+
+ /*
+ * "From: addr-spec (ctext)". This is the obsolete form.
+ */
+ case HFROM_FORMAT_CODE_OBS:
+ vstring_sprintf(state->temp2, "%sFrom: %s ",
+ state->resent, vstring_str(state->temp1));
+ vstring_sprintf(state->temp1, "(%s)", state->fullname);
+ token = tok822_parse(vstring_str(state->temp1));
+ tok822_externalize(state->temp2, token, TOK822_STR_NONE);
+ tok822_free_tree(token);
+ break;
+ default:
+ msg_panic("%s: unknown header format %d",
+ myname, hfrom_format_code);
+ }
+ }
+
+ /*
+ * "From: addr-spec". This is the form in the absence of full name
+ * information, also used for mail from mailer-daemon.
+ */
+ else {
+ vstring_sprintf(state->temp2, "%sFrom: %s",
+ state->resent, vstring_str(state->temp1));
+ }
+ CLEANUP_OUT_BUF(state, REC_TYPE_NORM, state->temp2);
+ }
+
+ /*
+ * XXX 2821: Appendix B: The return address in the MAIL command SHOULD,
+ * if possible, be derived from the system's identity for the submitting
+ * (local) user, and the "From:" header field otherwise. If there is a
+ * system identity available, it SHOULD also be copied to the Sender
+ * header field if it is different from the address in the From header
+ * field. (Any Sender field that was already there SHOULD be removed.)
+ * Similar wording appears in RFC 2822 section 3.6.2.
+ *
+ * Postfix presently does not insert a Sender: header if envelope and From:
+ * address differ. Older Postfix versions assumed that the envelope
+ * sender address specifies the system identity and inserted Sender:
+ * whenever envelope and From: differed. This was wrong with relayed
+ * mail, and was often not even desirable with original submissions.
+ *
+ * XXX 2822 Section 3.6.2, as well as RFC 822 Section 4.1: FROM headers can
+ * contain multiple addresses. If this is the case, then a Sender: header
+ * must be provided with a single address.
+ *
+ * Postfix does not count the number of addresses in a From: header
+ * (although doing so is trivial, once the address is parsed).
+ */
+
+ /*
+ * Add a missing destination header.
+ */
+#define VISIBLE_RCPT ((1 << HDR_TO) | (1 << HDR_RESENT_TO) \
+ | (1 << HDR_CC) | (1 << HDR_RESENT_CC))
+
+ if ((state->hdr_rewrite_context || var_always_add_hdrs)
+ && (state->headers_seen & VISIBLE_RCPT) == 0 && *var_rcpt_witheld) {
+ if (!is_header(var_rcpt_witheld)) {
+ msg_warn("bad %s header text \"%s\" -- "
+ "need \"headername: headervalue\"",
+ VAR_RCPT_WITHELD, var_rcpt_witheld);
+ } else {
+ cleanup_out_format(state, REC_TYPE_NORM, "%s", var_rcpt_witheld);
+ }
+ }
+
+ /*
+ * Place a dummy PTR record right after the last header so that we can
+ * append headers without having to worry about clobbering the
+ * end-of-content marker.
+ */
+ if (state->milters || cleanup_milters) {
+ if ((state->append_hdr_pt_offset = vstream_ftell(state->dst)) < 0)
+ msg_fatal("%s: vstream_ftell %s: %m", myname, cleanup_path);
+ cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, 0L);
+ if ((state->append_hdr_pt_target = vstream_ftell(state->dst)) < 0)
+ msg_fatal("%s: vstream_ftell %s: %m", myname, cleanup_path);
+ state->body_offset = state->append_hdr_pt_target;
+ }
+}
+
+/* cleanup_body_callback - output one body record */
+
+static void cleanup_body_callback(void *context, int type,
+ const char *buf, ssize_t len,
+ off_t offset)
+{
+ CLEANUP_STATE *state = (CLEANUP_STATE *) context;
+
+ /*
+ * XXX Workaround: when we reach the end of headers, mime_state_update()
+ * may execute up to three call-backs before returning to the caller:
+ * head_out(), head_end(), and body_out() or body_end(). As long as
+ * call-backs don't return a result, each call-back has to check for
+ * itself if the previous call-back experienced a problem.
+ */
+ if (CLEANUP_OUT_OK(state) == 0)
+ return;
+
+ /*
+ * Crude message body content filter for emergencies. This code has
+ * several problems: it sees one line at a time; it looks at long lines
+ * only in chunks of line_length_limit (2048) characters; it is easily
+ * bypassed with encodings and other tricks.
+ */
+ if ((state->flags & CLEANUP_FLAG_FILTER)
+ && cleanup_body_checks
+ && (var_body_check_len == 0 || offset < var_body_check_len)) {
+ const char *value;
+
+ if ((value = maps_find(cleanup_body_checks, buf, 0)) != 0) {
+ const char *result;
+
+ if ((result = cleanup_act(state, CLEANUP_ACT_CTXT_BODY,
+ buf, value, VAR_BODY_CHECKS))
+ == CLEANUP_ACT_DROP) {
+ return;
+ } else if (result != buf) {
+ cleanup_out(state, type, result, strlen(result));
+ myfree((void *) result);
+ return;
+ }
+ } else if (cleanup_body_checks->error) {
+ msg_warn("%s: %s map lookup problem -- "
+ "message not accepted, try again later",
+ state->queue_id, cleanup_body_checks->title);
+ state->errs |= CLEANUP_STAT_WRITE;
+ }
+ }
+ cleanup_out(state, type, buf, len);
+}
+
+/* cleanup_message_headerbody - process message content, header and body */
+
+static void cleanup_message_headerbody(CLEANUP_STATE *state, int type,
+ const char *buf, ssize_t len)
+{
+ const char *myname = "cleanup_message_headerbody";
+ const MIME_STATE_DETAIL *detail;
+ const char *cp;
+ char *dst;
+
+ /*
+ * Reject unwanted characters.
+ *
+ * XXX Possible optimization: simplify the loop when the "reject" set
+ * contains only one character.
+ */
+ if ((state->flags & CLEANUP_FLAG_FILTER) && cleanup_reject_chars) {
+ for (cp = buf; cp < buf + len; cp++) {
+ if (memchr(vstring_str(cleanup_reject_chars),
+ *(const unsigned char *) cp,
+ VSTRING_LEN(cleanup_reject_chars))) {
+ cleanup_act(state, CLEANUP_ACT_CTXT_ANY,
+ buf, "REJECT disallowed character",
+ "character reject");
+ return;
+ }
+ }
+ }
+
+ /*
+ * Strip unwanted characters. Don't overwrite the input.
+ *
+ * XXX Possible space+time optimization: use a bitset.
+ *
+ * XXX Possible optimization: simplify the loop when the "strip" set
+ * contains only one character.
+ *
+ * XXX Possible optimization: copy the input only if we really have to.
+ */
+ if ((state->flags & CLEANUP_FLAG_FILTER) && cleanup_strip_chars) {
+ VSTRING_RESET(state->stripped_buf);
+ VSTRING_SPACE(state->stripped_buf, len + 1);
+ dst = vstring_str(state->stripped_buf);
+ for (cp = buf; cp < buf + len; cp++)
+ if (!memchr(vstring_str(cleanup_strip_chars),
+ *(const unsigned char *) cp,
+ VSTRING_LEN(cleanup_strip_chars)))
+ *dst++ = *cp;
+ *dst = 0;
+ buf = vstring_str(state->stripped_buf);
+ len = dst - buf;
+ }
+
+ /*
+ * Copy text record to the output.
+ */
+ if (type == REC_TYPE_NORM || type == REC_TYPE_CONT) {
+ state->mime_errs = mime_state_update(state->mime_state, type, buf, len);
+ }
+
+ /*
+ * If we have reached the end of the message content segment, record the
+ * current file position so we can compute the message size lateron.
+ */
+ else if (type == REC_TYPE_XTRA) {
+ state->mime_errs = mime_state_update(state->mime_state, type, buf, len);
+ if (state->milters || cleanup_milters)
+ /* Make room for body modification. */
+ cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT, 0L);
+ /* Ignore header truncation after primary message headers. */
+ state->mime_errs &= ~MIME_ERR_TRUNC_HEADER;
+ if (state->mime_errs && state->reason == 0) {
+ state->errs |= CLEANUP_STAT_CONT;
+ detail = mime_state_detail(state->mime_errs);
+ state->reason = dsn_prepend(detail->dsn, detail->text);
+ }
+ state->mime_state = mime_state_free(state->mime_state);
+ if ((state->xtra_offset = vstream_ftell(state->dst)) < 0)
+ msg_fatal("%s: vstream_ftell %s: %m", myname, cleanup_path);
+ state->cont_length = state->xtra_offset - state->data_offset;
+ state->action = cleanup_extracted;
+ }
+
+ /*
+ * This should never happen.
+ */
+ else {
+ msg_warn("%s: message rejected: "
+ "unexpected record type %d in message content", myname, type);
+ state->errs |= CLEANUP_STAT_BAD;
+ }
+}
+
+/* cleanup_mime_error_callback - error report call-back routine */
+
+static void cleanup_mime_error_callback(void *context, int err_code,
+ const char *text, ssize_t len)
+{
+ CLEANUP_STATE *state = (CLEANUP_STATE *) context;
+ const char *origin;
+
+ /*
+ * Message header too large errors are handled after the end of the
+ * primary message headers.
+ */
+ if ((err_code & ~MIME_ERR_TRUNC_HEADER) != 0) {
+ if ((origin = nvtable_find(state->attr, MAIL_ATTR_LOG_ORIGIN)) == 0)
+ origin = MAIL_ATTR_ORG_NONE;
+#define TEXT_LEN (len < 100 ? (int) len : 100)
+ msg_info("%s: reject: mime-error %s: %.*s from %s; from=<%s> to=<%s>",
+ state->queue_id, mime_state_error(err_code), TEXT_LEN, text,
+ origin, state->sender, state->recip ? state->recip : "unknown");
+ }
+}
+
+/* cleanup_message - initialize message content segment */
+
+void cleanup_message(CLEANUP_STATE *state, int type, const char *buf, ssize_t len)
+{
+ const char *myname = "cleanup_message";
+ int mime_options;
+
+ /*
+ * Write the start-of-content segment marker.
+ */
+ cleanup_out_string(state, REC_TYPE_MESG, "");
+ if ((state->data_offset = vstream_ftell(state->dst)) < 0)
+ msg_fatal("%s: vstream_ftell %s: %m", myname, cleanup_path);
+
+ /*
+ * Set up MIME processing options, if any. MIME_OPT_DISABLE_MIME disables
+ * special processing of Content-Type: headers, and thus, causes all text
+ * after the primary headers to be treated as the message body.
+ */
+ mime_options = 0;
+ if (var_disable_mime_input) {
+ mime_options |= MIME_OPT_DISABLE_MIME;
+ } else {
+ /* Turn off content checks if bouncing or forwarding mail. */
+ if (state->flags & CLEANUP_FLAG_FILTER) {
+ if (var_strict_8bitmime || var_strict_7bit_hdrs)
+ mime_options |= MIME_OPT_REPORT_8BIT_IN_HEADER;
+ if (var_strict_8bitmime || var_strict_8bit_body)
+ mime_options |= MIME_OPT_REPORT_8BIT_IN_7BIT_BODY;
+ if (var_strict_encoding)
+ mime_options |= MIME_OPT_REPORT_ENCODING_DOMAIN;
+ if (var_strict_8bitmime || var_strict_7bit_hdrs
+ || var_strict_8bit_body || var_strict_encoding
+ || *var_header_checks || *var_mimehdr_checks
+ || *var_nesthdr_checks)
+ mime_options |= MIME_OPT_REPORT_NESTING;
+ }
+ }
+ state->mime_state = mime_state_alloc(mime_options,
+ cleanup_header_callback,
+ cleanup_header_done_callback,
+ cleanup_body_callback,
+ (MIME_STATE_ANY_END) 0,
+ cleanup_mime_error_callback,
+ (void *) state);
+
+ /*
+ * XXX Workaround: truncate a long message header so that we don't exceed
+ * the default Sendmail libmilter request size limit of 65535.
+ */
+#define KLUDGE_HEADER_LIMIT 60000
+ if ((cleanup_milters || state->milters)
+ && var_header_limit > KLUDGE_HEADER_LIMIT)
+ var_header_limit = KLUDGE_HEADER_LIMIT;
+
+ /*
+ * Pass control to the header processing routine.
+ */
+ state->action = cleanup_message_headerbody;
+ cleanup_message_headerbody(state, type, buf, len);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 10:56:06 +0000