--- /dev/null
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+/* Experimental DMARC support.
+ Copyright (c) Todd Lyons <tlyons@exim.org> 2012, 2013
+ License: GPL */
+
+/* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
+ All rights reserved, licensed for use per LICENSE.opendmarc. */
+
+/* Code for calling dmarc checks via libopendmarc. Called from acl.c. */
+
+#include "exim.h"
+#ifdef EXPERIMENTAL_DMARC
+
+#include "functions.h"
+#include "dmarc.h"
+#include "pdkim/pdkim.h"
+
+OPENDMARC_LIB_T dmarc_ctx;
+DMARC_POLICY_T *dmarc_pctx = NULL;
+OPENDMARC_STATUS_T libdm_status, action, dmarc_policy;
+OPENDMARC_STATUS_T da, sa, action;
+BOOL dmarc_abort = FALSE;
+uschar *dmarc_pass_fail = US"skipped";
+extern pdkim_signature *dkim_signatures;
+header_line *from_header = NULL;
+#ifdef EXPERIMENTAL_SPF
+extern SPF_response_t *spf_response;
+int dmarc_spf_result = 0;
+uschar *spf_sender_domain = NULL;
+uschar *spf_human_readable = NULL;
+#endif
+u_char *header_from_sender = NULL;
+int history_file_status = DMARC_HIST_OK;
+uschar *history_buffer = NULL;
+uschar *dkim_history_buffer= NULL;
+
+/* Accept an error_block struct, initialize if empty, parse to the
+ * end, and append the two strings passed to it. Used for adding
+ * variable amounts of value:pair data to the forensic emails. */
+
+static error_block *
+add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
+{
+ error_block *eb = malloc(sizeof(error_block));
+ if (eblock == NULL)
+ eblock = eb;
+ else
+ {
+ /* Find the end of the eblock struct and point it at eb */
+ error_block *tmp = eblock;
+ while(tmp->next != NULL)
+ tmp = tmp->next;
+ tmp->next = eb;
+ }
+ eb->text1 = t1;
+ eb->text2 = t2;
+ eb->next = NULL;
+ return eblock;
+}
+
+/* dmarc_init sets up a context that can be re-used for several
+ messages on the same SMTP connection (that come from the
+ same host with the same HELO string) */
+
+int dmarc_init() {
+ int *netmask = NULL; /* Ignored */
+ int is_ipv6 = 0;
+ char *tld_file = (dmarc_tld_file == NULL) ?
+ "/etc/exim/opendmarc.tlds" :
+ (char *)dmarc_tld_file;
+
+ /* Set some sane defaults. Also clears previous results when
+ * multiple messages in one connection. */
+ dmarc_pctx = NULL;
+ dmarc_status = US"none";
+ dmarc_abort = FALSE;
+ dmarc_pass_fail = US"skipped";
+ dmarc_used_domain = US"";
+ header_from_sender = NULL;
+#ifdef EXPERIMENTAL_SPF
+ spf_sender_domain = NULL;
+ spf_human_readable = NULL;
+#endif
+
+ /* ACLs have "control=dmarc_disable_verify" */
+ if (dmarc_disable_verify == TRUE)
+ return OK;
+
+ (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
+ dmarc_ctx.nscount = 0;
+ libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+ dmarc_abort = TRUE;
+ }
+ if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
+ tld_file, errno);
+ dmarc_abort = TRUE;
+ }
+ if (sender_host_address == NULL)
+ dmarc_abort = TRUE;
+ /* This catches locally originated email and startup errors above. */
+ if ( dmarc_abort == FALSE )
+ {
+ is_ipv6 = string_is_ip_address(sender_host_address, netmask);
+ is_ipv6 = (is_ipv6 == 6) ? TRUE :
+ (is_ipv6 == 4) ? FALSE : FALSE;
+ dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
+ if (dmarc_pctx == NULL )
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure creating policy context: ip=%s",
+ sender_host_address);
+ dmarc_abort = TRUE;
+ }
+ }
+
+ return OK;
+}
+
+
+/* dmarc_store_data stores the header data so that subsequent
+ * dmarc_process can access the data */
+
+int dmarc_store_data(header_line *hdr) {
+ /* No debug output because would change every test debug output */
+ if (dmarc_disable_verify != TRUE)
+ from_header = hdr;
+ return OK;
+}
+
+
+/* dmarc_process adds the envelope sender address to the existing
+ context (if any), retrieves the result, sets up expansion
+ strings and evaluates the condition outcome. */
+
+int dmarc_process() {
+ int sr, origin; /* used in SPF section */
+ pdkim_signature *sig = NULL;
+ BOOL has_dmarc_record = TRUE;
+ u_char **ruf; /* forensic report addressees, if called for */
+
+ /* ACLs have "control=dmarc_disable_verify" */
+ if (dmarc_disable_verify == TRUE)
+ {
+ dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
+ 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 (from_header == NULL || dmarc_abort == TRUE)
+ dmarc_abort = TRUE;
+ else
+ {
+ /* I strongly encourage anybody who can make this better to contact me directly!
+ * <cannonball> Is this an insane way to extract the email address from the From: header?
+ * <jgh_hm> it's sure a horrid layer-crossing....
+ * <cannonball> I'm not denying that :-/
+ * <jgh_hm> there may well be no better though
+ */
+ header_from_sender = expand_string(
+ string_sprintf("${domain:${extract{1}{:}{${addresses:%s}}}}",
+ from_header->text) );
+ /* The opendmarc library extracts the domain from the email address, but
+ * only try to store it if it's not empty. Otherwise, skip out of DMARC. */
+ if (strcmp( CCS header_from_sender, "") == 0)
+ dmarc_abort = TRUE;
+ libdm_status = (dmarc_abort == TRUE) ?
+ DMARC_PARSE_OKAY :
+ opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to store header From: in DMARC: %s, header was '%s'",
+ opendmarc_policy_status_to_str(libdm_status), from_header->text);
+ dmarc_abort = TRUE;
+ }
+ }
+
+ /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
+ * instead do this in the ACLs. */
+ if (dmarc_abort == FALSE && sender_host_authenticated == NULL)
+ {
+#ifdef EXPERIMENTAL_SPF
+ /* Use the envelope sender domain for this part of DMARC */
+ spf_sender_domain = expand_string(US"$sender_address_domain");
+ if ( spf_response == NULL )
+ {
+ /* No spf data means null envelope sender so generate a domain name
+ * from the sender_host_name || sender_helo_name */
+ if (spf_sender_domain == NULL)
+ {
+ spf_sender_domain = (sender_host_name == NULL) ? sender_helo_name : sender_host_name;
+ uschar *subdomain = spf_sender_domain;
+ int count = 0;
+ while (subdomain && *subdomain != '.')
+ {
+ subdomain++;
+ count++;
+ }
+ /* If parsed characters in temp var "subdomain" and is pointing to
+ * a period now, get rid of the period and use that. Otherwise
+ * will use whatever was first set in spf_sender_domain. Goal is to
+ * generate a sane answer, not necessarily the right/best answer b/c
+ * at this point with a null sender, it's a bounce message, making
+ * the spf domain be subjective. */
+ if (count > 0 && *subdomain == '.')
+ {
+ subdomain++;
+ spf_sender_domain = subdomain;
+ }
+ log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
+ spf_sender_domain);
+ DEBUG(D_receive)
+ debug_printf("DMARC using synthesized SPF sender domain = %s\n", spf_sender_domain);
+ }
+ dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
+ origin = DMARC_POLICY_SPF_ORIGIN_HELO;
+ spf_human_readable = US"";
+ }
+ else
+ {
+ sr = spf_response->result;
+ dmarc_spf_result = (sr == SPF_RESULT_NEUTRAL) ? DMARC_POLICY_SPF_OUTCOME_NONE :
+ (sr == SPF_RESULT_PASS) ? DMARC_POLICY_SPF_OUTCOME_PASS :
+ (sr == SPF_RESULT_FAIL) ? DMARC_POLICY_SPF_OUTCOME_FAIL :
+ (sr == SPF_RESULT_SOFTFAIL) ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
+ DMARC_POLICY_SPF_OUTCOME_NONE;
+ origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
+ spf_human_readable = (uschar *)spf_response->header_comment;
+ DEBUG(D_receive)
+ debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
+ }
+ if (strcmp( CCS spf_sender_domain, "") == 0)
+ dmarc_abort = TRUE;
+ if (dmarc_abort == FALSE)
+ {
+ libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
+ dmarc_spf_result, origin, spf_human_readable);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+ }
+#endif /* EXPERIMENTAL_SPF */
+
+ /* Now we cycle through the dkim signature results and put into
+ * the opendmarc context, further building the DMARC reply. */
+ sig = dkim_signatures;
+ dkim_history_buffer = US"";
+ while (sig != NULL)
+ {
+ int dkim_result, vs;
+ vs = sig->verify_status;
+ dkim_result = ( vs == PDKIM_VERIFY_PASS ) ? DMARC_POLICY_DKIM_OUTCOME_PASS :
+ ( vs == PDKIM_VERIFY_FAIL ) ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
+ ( vs == PDKIM_VERIFY_INVALID ) ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
+ DMARC_POLICY_DKIM_OUTCOME_NONE;
+ libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
+ dkim_result, US"");
+ DEBUG(D_receive)
+ debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to store dkim (%s) for DMARC: %s",
+ sig->domain, opendmarc_policy_status_to_str(libdm_status));
+
+ dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
+ sig->domain, dkim_result);
+ sig = sig->next;
+ }
+ libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
+ switch (libdm_status)
+ {
+ case DMARC_DNS_ERROR_NXDOMAIN:
+ case DMARC_DNS_ERROR_NO_RECORD:
+ DEBUG(D_receive)
+ debug_printf("DMARC no record found for %s\n", header_from_sender);
+ has_dmarc_record = FALSE;
+ break;
+ case DMARC_PARSE_OKAY:
+ DEBUG(D_receive)
+ debug_printf("DMARC record found for %s\n", header_from_sender);
+ break;
+ case DMARC_PARSE_ERROR_BAD_VALUE:
+ DEBUG(D_receive)
+ debug_printf("DMARC record parse error for %s\n", header_from_sender);
+ has_dmarc_record = FALSE;
+ break;
+ default:
+ /* everything else, skip dmarc */
+ DEBUG(D_receive)
+ debug_printf("DMARC skipping (%d), unsure what to do with %s",
+ libdm_status, from_header->text);
+ has_dmarc_record = FALSE;
+ break;
+ }
+ /* Can't use exim's string manipulation functions so allocate memory
+ * for libopendmarc using its max hostname length definition. */
+ uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
+ libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx, dmarc_domain,
+ DMARC_MAXHOSTNAMELEN-1);
+ dmarc_used_domain = string_copy(dmarc_domain);
+ free(dmarc_domain);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to read domainname used for DMARC lookup: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+ }
+ libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
+ dmarc_policy = libdm_status;
+ switch(libdm_status)
+ {
+ case DMARC_POLICY_ABSENT: /* No DMARC record found */
+ dmarc_status = US"norecord";
+ dmarc_pass_fail = US"temperror";
+ dmarc_status_text = US"No DMARC record";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_FROM_DOMAIN_ABSENT: /* No From: domain */
+ dmarc_status = US"nofrom";
+ dmarc_pass_fail = US"temperror";
+ dmarc_status_text = US"No From: domain found";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_NONE: /* Accept and report */
+ dmarc_status = US"none";
+ dmarc_pass_fail = US"none";
+ dmarc_status_text = US"None, Accept";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_PASS: /* Explicit accept */
+ dmarc_status = US"accept";
+ dmarc_pass_fail = US"pass";
+ dmarc_status_text = US"Accept";
+ action = DMARC_RESULT_ACCEPT;
+ break;
+ case DMARC_POLICY_REJECT: /* Explicit reject */
+ dmarc_status = US"reject";
+ dmarc_pass_fail = US"fail";
+ dmarc_status_text = US"Reject";
+ action = DMARC_RESULT_REJECT;
+ break;
+ case DMARC_POLICY_QUARANTINE: /* Explicit quarantine */
+ dmarc_status = US"quarantine";
+ dmarc_pass_fail = US"fail";
+ dmarc_status_text = US"Quarantine";
+ action = DMARC_RESULT_QUARANTINE;
+ break;
+ default:
+ dmarc_status = US"temperror";
+ dmarc_pass_fail = US"temperror";
+ dmarc_status_text = US"Internal Policy Error";
+ action = DMARC_RESULT_TEMPFAIL;
+ break;
+ }
+
+ libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
+ if (libdm_status != DMARC_PARSE_OKAY)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
+ opendmarc_policy_status_to_str(libdm_status));
+ }
+
+ if (has_dmarc_record == TRUE)
+ {
+ log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
+ "spf_align=%s dkim_align=%s enforcement='%s'",
+ spf_sender_domain, dmarc_used_domain,
+ (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
+ (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
+ dmarc_status_text);
+ history_file_status = dmarc_write_history_file();
+ /* Now get the forensic reporting addresses, if any */
+ ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
+ dmarc_send_forensic_report(ruf);
+ }
+ }
+
+ /* set some global variables here */
+ dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
+
+ /* shut down libopendmarc */
+ if ( dmarc_pctx != NULL )
+ (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
+ if ( dmarc_disable_verify == FALSE )
+ (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
+
+ return OK;
+}
+
+int dmarc_write_history_file()
+{
+ static int history_file_fd;
+ ssize_t written_len;
+ int tmp_ans;
+ u_char **rua; /* aggregate report addressees */
+
+ if (dmarc_history_file == NULL)
+ return DMARC_HIST_DISABLED;
+ history_file_fd = log_create(dmarc_history_file);
+
+ if (history_file_fd < 0)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
+ dmarc_history_file);
+ return DMARC_HIST_FILE_ERR;
+ }
+
+ /* Generate the contents of the history file */
+ history_buffer = string_sprintf("job %s\n", message_id);
+ history_buffer = string_sprintf("%sreporter %s\n", history_buffer, primary_hostname);
+ history_buffer = string_sprintf("%sreceived %ld\n", history_buffer, time(NULL));
+ history_buffer = string_sprintf("%sipaddr %s\n", history_buffer, sender_host_address);
+ history_buffer = string_sprintf("%sfrom %s\n", history_buffer, header_from_sender);
+ history_buffer = string_sprintf("%smfrom %s\n", history_buffer,
+ expand_string(US"$sender_address_domain"));
+
+#ifdef EXPERIMENTAL_SPF
+ if (spf_response != NULL)
+ history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_result);
+#else
+ history_buffer = string_sprintf("%sspf -1\n", history_buffer);
+#endif /* EXPERIMENTAL_SPF */
+
+ history_buffer = string_sprintf("%s%s", history_buffer, dkim_history_buffer);
+ history_buffer = string_sprintf("%spdomain %s\n", history_buffer, dmarc_used_domain);
+ history_buffer = string_sprintf("%spolicy %d\n", history_buffer, dmarc_policy);
+
+ rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1);
+ if (rua != NULL)
+ {
+ for (tmp_ans = 0; rua[tmp_ans] != NULL; tmp_ans++)
+ {
+ history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
+ }
+ }
+ else
+ history_buffer = string_sprintf("%srua -\n", history_buffer);
+
+ opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
+ history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
+
+ opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
+ history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
+
+ opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
+ history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
+
+ opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
+ history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
+
+ opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
+ history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
+
+ history_buffer = string_sprintf("%salign_dkim %d\n", history_buffer, da);
+ history_buffer = string_sprintf("%salign_spf %d\n", history_buffer, sa);
+ history_buffer = string_sprintf("%saction %d\n", history_buffer, action);
+
+ /* Write the contents to the history file */
+ DEBUG(D_receive)
+ debug_printf("DMARC logging history data for opendmarc reporting%s\n",
+ (host_checking || running_in_test_harness) ? " (not really)" : "");
+ if (host_checking || running_in_test_harness)
+ {
+ DEBUG(D_receive)
+ debug_printf("DMARC history data for debugging:\n%s", history_buffer);
+ }
+ else
+ {
+ written_len = write_to_fd_buf(history_file_fd,
+ history_buffer,
+ Ustrlen(history_buffer));
+ if (written_len == 0)
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
+ dmarc_history_file);
+ return DMARC_HIST_WRITE_ERR;
+ }
+ (void)close(history_file_fd);
+ }
+ return DMARC_HIST_OK;
+}
+
+void dmarc_send_forensic_report(u_char **ruf)
+{
+ int c;
+ uschar *recipient, *save_sender;
+ BOOL send_status = FALSE;
+ error_block *eblock = NULL;
+ FILE *message_file = NULL;
+
+ /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
+ if (dmarc_enable_forensic == FALSE)
+ return;
+
+ if ((dmarc_policy == DMARC_POLICY_REJECT && action == DMARC_RESULT_REJECT) ||
+ (dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE) )
+ {
+ if (ruf != NULL)
+ {
+ eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
+ eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
+ eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
+ eblock = add_to_eblock(eblock, US"SPF Alignment",
+ (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
+ eblock = add_to_eblock(eblock, US"DKIM Alignment",
+ (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
+ eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
+ /* Set a sane default envelope sender */
+ dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
+ dsn_from ? dsn_from :
+ string_sprintf("do-not-reply@%s",primary_hostname);
+ for (c = 0; ruf[c] != NULL; c++)
+ {
+ recipient = string_copylc(ruf[c]);
+ if (Ustrncmp(recipient, "mailto:",7))
+ continue;
+ /* Move to first character past the colon */
+ recipient += 7;
+ DEBUG(D_receive)
+ debug_printf("DMARC forensic report to %s%s\n", recipient,
+ (host_checking || running_in_test_harness) ? " (not really)" : "");
+ if (host_checking || running_in_test_harness)
+ continue;
+ save_sender = sender_address;
+ sender_address = recipient;
+ send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
+ header_list, message_file, FALSE);
+ sender_address = save_sender;
+ if (send_status == FALSE)
+ log_write(0, LOG_MAIN|LOG_PANIC, "failure to send DMARC forensic report to %s",
+ recipient);
+ }
+ }
+ }
+}
+
+uschar *dmarc_exim_expand_query(int what)
+{
+ if (dmarc_disable_verify || !dmarc_pctx)
+ return dmarc_exim_expand_defaults(what);
+
+ switch(what) {
+ case DMARC_VERIFY_STATUS:
+ return(dmarc_status);
+ default:
+ return US"";
+ }
+}
+
+uschar *dmarc_exim_expand_defaults(int what)
+{
+ switch(what) {
+ case DMARC_VERIFY_STATUS:
+ return (dmarc_disable_verify) ?
+ US"off" :
+ US"none";
+ default:
+ return US"";
+ }
+}
+
+uschar *dmarc_auth_results_header(header_line *from_header, uschar *hostname)
+{
+ uschar *hdr_tmp = US"";
+
+ /* Allow a server hostname to be passed to this function, but is
+ * currently unused */
+ if (hostname == NULL)
+ hostname = primary_hostname;
+ hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
+
+#if 0
+ /* I don't think this belongs here, but left it here commented out
+ * because it was a lot of work to get working right. */
+#ifdef EXPERIMENTAL_SPF
+ if (spf_response != NULL) {
+ uschar *dmarc_ar_spf = US"";
+ int sr = 0;
+ sr = spf_response->result;
+ dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL) ? US"neutral" :
+ (sr == SPF_RESULT_PASS) ? US"pass" :
+ (sr == SPF_RESULT_FAIL) ? US"fail" :
+ (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
+ US"none";
+ hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
+ hdr_tmp, dmarc_ar_spf_result,
+ spf_response->header_comment,
+ expand_string(US"$sender_address") );
+ }
+#endif
+#endif
+ hdr_tmp = string_sprintf("%s dmarc=%s",
+ hdr_tmp, dmarc_pass_fail);
+ if (header_from_sender)
+ hdr_tmp = string_sprintf("%s header.from=%s",
+ hdr_tmp, header_from_sender);
+ return hdr_tmp;
+}
+
+#endif
+
+// vim:sw=2 expandtab
git://git.exim.org / exim.git / commitdiff