* Exim - an Internet mail transport agent *
*************************************************/
/* DMARC support.
+ Copyright (c) The Exim Maintainers 2019 - 2022
Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
- Copyright (c) The Exim Maintainers 2019 - 2021
License: GPL */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
All rights reserved, licensed for use per LICENSE.opendmarc. */
rr = dns_next_rr(dnsa, &dnss, RESET_NEXT))
if (rr->type == T_TXT && rr->size > 3)
{
+ uschar *record = string_copyn_taint(US rr->data, rr->size, GET_TAINTED);
store_free_dns_answer(dnsa);
- return string_copyn_taint(US rr->data, rr->size, GET_TAINTED);
+ return record;
}
store_free_dns_answer(dnsa);
return NULL;
int history_file_fd;
ssize_t written_len;
int tmp_ans;
-u_char **rua; /* aggregate report addressees */
-uschar *history_buffer = NULL;
+u_char ** rua; /* aggregate report addressees */
+gstring * g;
if (!dmarc_history_file)
{
}
/* Generate the contents of the history file */
-history_buffer = string_sprintf(
+g = string_fmt_append(NULL,
"job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
message_id, primary_hostname, time(NULL), sender_host_address,
header_from_sender, expand_string(US"$sender_address_domain"));
if (spf_response)
- history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
- /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
+ g = string_fmt_append(s, "spf %d\n", dmarc_spf_ares_result);
-history_buffer = string_sprintf(
- "%s%spdomain %s\npolicy %d\n",
- history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
+g = string_fmt_append(g, "%spdomain %s\npolicy %d\n",
+ dkim_history_buffer, dmarc_used_domain, dmarc_policy);
if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
- history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
+ g = string_fmd_append(g, "rua %s\n", rua[tmp_ans]);
else
- history_buffer = string_sprintf("%srua -\n", history_buffer);
+ g = string_fmtappend(g, "rua -\n");
opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
-history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
+g = atring_fmt_append(g, "pct %d\n", tmp_ans);
opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
-history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
+g = atring_fmt_append(g, "adkim %d\n", tmp_ans);
opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
-history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
+g = atring_fmt_append(g, "aspf %d\n", tmp_ans);
opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
-history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
+g = atring_fmt_append(g, "p %d\n", tmp_ans);
opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
-history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
+g = atring_fmt_append(g, "sp %d\n", tmp_ans);
-history_buffer = string_sprintf(
- "%salign_dkim %d\nalign_spf %d\naction %d\n",
- history_buffer, da, sa, action);
+g = atring_fmt_append(g, "align_dkim %d\nalign_spf %d\naction %d\n",
+ da, sa, action);
/* Write the contents to the history file */
DEBUG(D_receive)
if (host_checking || f.running_in_test_harness)
{
DEBUG(D_receive)
- debug_printf("DMARC history data for debugging:\n%s", history_buffer);
+ debug_printf("DMARC history data for debugging:\n%Y", g);
}
else
{
written_len = write_to_fd_buf(history_file_fd,
- history_buffer,
- Ustrlen(history_buffer));
+ g->s,
+ gstring_length(g));
if (written_len == 0)
{
log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
pdkim_signature * sig = dkim_signatures;
uschar * rr;
BOOL has_dmarc_record = TRUE;
-u_char **ruf; /* forensic report addressees, if called for */
+u_char ** ruf; /* forensic report addressees, if called for */
/* ACLs have "control=dmarc_disable_verify" */
if (f.dmarc_disable_verify)
return OK;
/* Store the header From: sender domain for this part of DMARC.
- * If there is no from_header struct, then it's likely this message
- * is locally generated and relying on fixups to add it. Just skip
- * the entire DMARC system if we can't find a From: header....or if
- * there was a previous error.
- */
+If there is no from_header struct, then it's likely this message
+is locally generated and relying on fixups to add it. Just skip
+the entire DMARC system if we can't find a From: header....or if
+there was a previous error. */
+
if (!from_header)
{
DEBUG(D_receive) debug_printf("DMARC: no From: header\n");
*p = saveend;
/* The opendmarc library extracts the domain from the email address, but
- * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
+ only try to store it if it's not empty. Otherwise, skip out of DMARC. */
+
if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
dmarc_abort = TRUE;
libdm_status = dmarc_abort
}
/* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
- * instead do this in the ACLs. */
+instead do this in the ACLs. */
+
if (!dmarc_abort && !sender_host_authenticated)
{
uschar * dmarc_domain;
+ gstring * g = NULL;
/* Use the envelope sender domain for this part of DMARC */
+
spf_sender_domain = expand_string(US"$sender_address_domain");
if (!spf_response)
{
/* No spf data means null envelope sender so generate a domain name
- * from the sender_helo_name */
+ from the sender_helo_name */
+
if (!spf_sender_domain)
{
spf_sender_domain = sender_helo_name;
}
/* Now we cycle through the dkim signature results and put into
- * the opendmarc context, further building the DMARC reply. */
- dkim_history_buffer = US"";
- while (sig)
+ the opendmarc context, further building the DMARC reply. */
+
+ for(pdkim_signature * sig = dkim_signatures; sig; sig = sig->next)
{
int dkim_result, dkim_ares_result, vs, ves;
vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
DMARC_POLICY_DKIM_OUTCOME_NONE;
libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain,
- dkim_result, US"");
+
+/* The opendmarc project broke its API in a way we can't detect * easily.
+The EDITME provides a DMARC_API variable */
+#if DMARC_API >= 100400
+ sig->selector,
+#endif
+ dkim_result, US"");
DEBUG(D_receive)
debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
if (libdm_status != DMARC_PARSE_OKAY)
ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT ? ARES_RESULT_PERMERROR :
ARES_RESULT_UNKNOWN :
ARES_RESULT_UNKNOWN;
- dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
- sig->domain, dkim_ares_result);
- sig = sig->next;
+ g = string_fmt_append(g, "dkim %s %d\n", sig->domain, dkim_ares_result);
}
+ dkim_history_buffer = string_from_gstring(g);
/* Look up DMARC policy record in DNS. We do this explicitly, rather than
letting the dmarc library do it with opendmarc_policy_query_dmarc(), so that
git://git.exim.org / exim.git / blobdiff