src/src/dmarc.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4 /* Experimental DMARC support.
   5    Copyright (c) Todd Lyons <tlyons@exim.org> 2012 - 2014
   6    License: GPL */
   7
   8 /* Portions Copyright (c) 2012, 2013, The Trusted Domain Project;
   9    All rights reserved, licensed for use per LICENSE.opendmarc. */
  10
  11 /* Code for calling dmarc checks via libopendmarc. Called from acl.c. */
  12
  13 #include "exim.h"
  14 #ifdef EXPERIMENTAL_DMARC
  15 # if !defined SUPPORT_SPF
  16 #  error SPF must also be enabled for DMARC
  17 # elif defined DISABLE_DKIM
  18 #  error DKIM must also be enabled for DMARC
  19 # else
  20
  21 #  include "functions.h"
  22 #  include "dmarc.h"
  23 #  include "pdkim/pdkim.h"
  24
  25 OPENDMARC_LIB_T     dmarc_ctx;
  26 DMARC_POLICY_T     *dmarc_pctx = NULL;
  27 OPENDMARC_STATUS_T  libdm_status, action, dmarc_policy;
  28 OPENDMARC_STATUS_T  da, sa, action;
  29 BOOL dmarc_abort  = FALSE;
  30 uschar *dmarc_pass_fail = US"skipped";
  31 header_line *from_header   = NULL;
  32 extern SPF_response_t   *spf_response;
  33 int dmarc_spf_ares_result  = 0;
  34 uschar *spf_sender_domain  = NULL;
  35 uschar *spf_human_readable = NULL;
  36 u_char *header_from_sender = NULL;
  37 int history_file_status    = DMARC_HIST_OK;
  38 uschar *dkim_history_buffer= NULL;
  39
  40 typedef struct dmarc_exim_p {
  41   uschar *name;
  42   int    value;
  43 } dmarc_exim_p;
  44
  45 static dmarc_exim_p dmarc_policy_description[] = {
  46   /* name               value */
  47   { US"",           DMARC_RECORD_P_UNSPECIFIED },
  48   { US"none",       DMARC_RECORD_P_NONE },
  49   { US"quarantine", DMARC_RECORD_P_QUARANTINE },
  50   { US"reject",     DMARC_RECORD_P_REJECT },
  51   { NULL,           0 }
  52 };
  53 /* Accept an error_block struct, initialize if empty, parse to the
  54  * end, and append the two strings passed to it.  Used for adding
  55  * variable amounts of value:pair data to the forensic emails. */
  56
  57 static error_block *
  58 add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
  59 {
  60 error_block *eb = store_malloc(sizeof(error_block));
  61 if (eblock == NULL)
  62   eblock = eb;
  63 else
  64   {
  65   /* Find the end of the eblock struct and point it at eb */
  66   error_block *tmp = eblock;
  67   while(tmp->next != NULL)
  68     tmp = tmp->next;
  69   tmp->next = eb;
  70   }
  71 eb->text1 = t1;
  72 eb->text2 = t2;
  73 eb->next  = NULL;
  74 return eblock;
  75 }
  76
  77 /* dmarc_init sets up a context that can be re-used for several
  78    messages on the same SMTP connection (that come from the
  79    same host with the same HELO string) */
  80
  81 int
  82 dmarc_init()
  83 {
  84 int *netmask   = NULL;   /* Ignored */
  85 int is_ipv6    = 0;
  86
  87 /* Set some sane defaults.  Also clears previous results when
  88  * multiple messages in one connection. */
  89 dmarc_pctx         = NULL;
  90 dmarc_status       = US"none";
  91 dmarc_abort        = FALSE;
  92 dmarc_pass_fail    = US"skipped";
  93 dmarc_used_domain  = US"";
  94 f.dmarc_has_been_checked = FALSE;
  95 header_from_sender = NULL;
  96 spf_sender_domain  = NULL;
  97 spf_human_readable = NULL;
  98
  99 /* ACLs have "control=dmarc_disable_verify" */
 100 if (f.dmarc_disable_verify == TRUE)
 101   return OK;
 102
 103 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
 104 dmarc_ctx.nscount = 0;
 105 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
 106 if (libdm_status != DMARC_PARSE_OKAY)
 107   {
 108   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
 109                        opendmarc_policy_status_to_str(libdm_status));
 110   dmarc_abort = TRUE;
 111   }
 112 if (!dmarc_tld_file || !*dmarc_tld_file)
 113   {
 114   DEBUG(D_receive) debug_printf("DMARC: no dmarc_tld_file\n");
 115   dmarc_abort = TRUE;
 116   }
 117 else if (opendmarc_tld_read_file(CS dmarc_tld_file, NULL, NULL, NULL))
 118   {
 119   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list '%s': %s",
 120                        dmarc_tld_file, strerror(errno));
 121   dmarc_abort = TRUE;
 122   }
 123 if (!sender_host_address)
 124   {
 125   DEBUG(D_receive) debug_printf("DMARC: no sender_host_address\n");
 126   dmarc_abort = TRUE;
 127   }
 128 /* This catches locally originated email and startup errors above. */
 129 if (!dmarc_abort)
 130   {
 131   is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6;
 132   if (!(dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6)))
 133     {
 134     log_write(0, LOG_MAIN|LOG_PANIC,
 135       "DMARC failure creating policy context: ip=%s", sender_host_address);
 136     dmarc_abort = TRUE;
 137     }
 138   }
 139
 140 return OK;
 141 }
 142
 143
 144 /* dmarc_store_data stores the header data so that subsequent
 145 dmarc_process can access the data */
 146
 147 int
 148 dmarc_store_data(header_line *hdr)
 149 {
 150 /* No debug output because would change every test debug output */
 151 if (!f.dmarc_disable_verify)
 152   from_header = hdr;
 153 return OK;
 154 }
 155
 156
 157 static void
 158 dmarc_send_forensic_report(u_char **ruf)
 159 {
 160 uschar *recipient, *save_sender;
 161 BOOL  send_status = FALSE;
 162 error_block *eblock = NULL;
 163 FILE *message_file = NULL;
 164
 165 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 166 if (!f.dmarc_enable_forensic)
 167   return;
 168
 169 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 170    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 171    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 172    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 173    )
 174   if (ruf)
 175     {
 176     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 177     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 178     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 179     eblock = add_to_eblock(eblock, US"SPF Alignment",
 180                      sa == DMARC_POLICY_SPF_ALIGNMENT_PASS ? US"yes" : US"no");
 181     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 182                      da == DMARC_POLICY_DKIM_ALIGNMENT_PASS ? US"yes" : US"no");
 183     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 184
 185     for (int c = 0; ruf[c]; c++)
 186       {
 187       recipient = string_copylc(ruf[c]);
 188       if (Ustrncmp(recipient, "mailto:",7))
 189         continue;
 190       /* Move to first character past the colon */
 191       recipient += 7;
 192       DEBUG(D_receive)
 193         debug_printf("DMARC forensic report to %s%s\n", recipient,
 194              (host_checking || f.running_in_test_harness) ? " (not really)" : "");
 195       if (host_checking || f.running_in_test_harness)
 196         continue;
 197
 198       if (!moan_send_message(recipient, ERRMESS_DMARC_FORENSIC, eblock,
 199                             header_list, message_file, NULL))
 200         log_write(0, LOG_MAIN|LOG_PANIC,
 201           "failure to send DMARC forensic report to %s", recipient);
 202       }
 203     }
 204 }
 205
 206 /* dmarc_process adds the envelope sender address to the existing
 207 context (if any), retrieves the result, sets up expansion
 208 strings and evaluates the condition outcome. */
 209
 210 int
 211 dmarc_process()
 212 {
 213 int sr, origin;             /* used in SPF section */
 214 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 215 int tmp_ans, c;
 216 pdkim_signature * sig = dkim_signatures;
 217 BOOL has_dmarc_record = TRUE;
 218 u_char **ruf; /* forensic report addressees, if called for */
 219
 220 /* ACLs have "control=dmarc_disable_verify" */
 221 if (f.dmarc_disable_verify)
 222   return OK;
 223
 224 /* Store the header From: sender domain for this part of DMARC.
 225  * If there is no from_header struct, then it's likely this message
 226  * is locally generated and relying on fixups to add it.  Just skip
 227  * the entire DMARC system if we can't find a From: header....or if
 228  * there was a previous error.
 229  */
 230 if (!from_header)
 231   {
 232   DEBUG(D_receive) debug_printf("DMARC: no From: header\n");
 233   dmarc_abort = TRUE;
 234   }
 235 else if (!dmarc_abort)
 236   {
 237   uschar * errormsg;
 238   int dummy, domain;
 239   uschar * p;
 240   uschar saveend;
 241
 242   f.parse_allow_group = TRUE;
 243   p = parse_find_address_end(from_header->text, FALSE);
 244   saveend = *p; *p = '\0';
 245   if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 246                               &dummy, &dummy, &domain, FALSE)))
 247     header_from_sender += domain;
 248   *p = saveend;
 249
 250   /* The opendmarc library extracts the domain from the email address, but
 251    * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 252   if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 253     dmarc_abort = TRUE;
 254   libdm_status = dmarc_abort
 255     ? DMARC_PARSE_OKAY
 256     : opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 257   if (libdm_status != DMARC_PARSE_OKAY)
 258     {
 259     log_write(0, LOG_MAIN|LOG_PANIC,
 260               "failure to store header From: in DMARC: %s, header was '%s'",
 261               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 262     dmarc_abort = TRUE;
 263     }
 264   }
 265
 266 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 267  * instead do this in the ACLs.  */
 268 if (!dmarc_abort && !sender_host_authenticated)
 269   {
 270   uschar * dmarc_domain;
 271
 272   /* Use the envelope sender domain for this part of DMARC */
 273   spf_sender_domain = expand_string(US"$sender_address_domain");
 274   if (!spf_response)
 275     {
 276     /* No spf data means null envelope sender so generate a domain name
 277      * from the sender_helo_name  */
 278     if (!spf_sender_domain)
 279       {
 280       spf_sender_domain = sender_helo_name;
 281       log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 282                              spf_sender_domain);
 283       DEBUG(D_receive)
 284         debug_printf("DMARC using synthesized SPF sender domain = %s\n",
 285           spf_sender_domain);
 286       }
 287     dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 288     dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
 289     origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 290     spf_human_readable = US"";
 291     }
 292   else
 293     {
 294     sr = spf_response->result;
 295     dmarc_spf_result = sr == SPF_RESULT_NEUTRAL  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 296                        sr == SPF_RESULT_PASS     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 297                        sr == SPF_RESULT_FAIL     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 298                        sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 299                        DMARC_POLICY_SPF_OUTCOME_NONE;
 300     dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL   ? ARES_RESULT_NEUTRAL :
 301                             sr == SPF_RESULT_PASS      ? ARES_RESULT_PASS :
 302                             sr == SPF_RESULT_FAIL      ? ARES_RESULT_FAIL :
 303                             sr == SPF_RESULT_SOFTFAIL  ? ARES_RESULT_SOFTFAIL :
 304                             sr == SPF_RESULT_NONE      ? ARES_RESULT_NONE :
 305                             sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
 306                             sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
 307                             ARES_RESULT_UNKNOWN;
 308     origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 309     spf_human_readable = US spf_response->header_comment;
 310     DEBUG(D_receive)
 311       debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 312     }
 313   if (strcmp( CCS spf_sender_domain, "") == 0)
 314     dmarc_abort = TRUE;
 315   if (!dmarc_abort)
 316     {
 317     libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 318                                 dmarc_spf_result, origin, spf_human_readable);
 319     if (libdm_status != DMARC_PARSE_OKAY)
 320       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 321                            opendmarc_policy_status_to_str(libdm_status));
 322     }
 323
 324   /* Now we cycle through the dkim signature results and put into
 325    * the opendmarc context, further building the DMARC reply.  */
 326   dkim_history_buffer = US"";
 327   while (sig)
 328     {
 329     int dkim_result, dkim_ares_result, vs, ves;
 330
 331     vs  = sig->verify_status & ~PDKIM_VERIFY_POLICY;
 332     ves = sig->verify_ext_status;
 333     dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 334                   vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 335                   vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 336                   DMARC_POLICY_DKIM_OUTCOME_NONE;
 337     libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain,
 338                                                dkim_result, US"");
 339     DEBUG(D_receive)
 340       debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 341     if (libdm_status != DMARC_PARSE_OKAY)
 342       log_write(0, LOG_MAIN|LOG_PANIC,
 343                 "failure to store dkim (%s) for DMARC: %s",
 344                 sig->domain, opendmarc_policy_status_to_str(libdm_status));
 345
 346     dkim_ares_result =
 347       vs == PDKIM_VERIFY_PASS    ? ARES_RESULT_PASS :
 348       vs == PDKIM_VERIFY_FAIL    ? ARES_RESULT_FAIL :
 349       vs == PDKIM_VERIFY_NONE    ? ARES_RESULT_NONE :
 350       vs == PDKIM_VERIFY_INVALID ?
 351        ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
 352        ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE        ? ARES_RESULT_PERMERROR :
 353        ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD   ? ARES_RESULT_PERMERROR :
 354        ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT      ? ARES_RESULT_PERMERROR :
 355        ARES_RESULT_UNKNOWN :
 356       ARES_RESULT_UNKNOWN;
 357     dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 358                                          sig->domain, dkim_ares_result);
 359     sig = sig->next;
 360     }
 361   libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 362   switch (libdm_status)
 363     {
 364     case DMARC_DNS_ERROR_NXDOMAIN:
 365     case DMARC_DNS_ERROR_NO_RECORD:
 366       DEBUG(D_receive)
 367         debug_printf("DMARC no record found for %s\n", header_from_sender);
 368       has_dmarc_record = FALSE;
 369       break;
 370     case DMARC_PARSE_OKAY:
 371       DEBUG(D_receive)
 372         debug_printf("DMARC record found for %s\n", header_from_sender);
 373       break;
 374     case DMARC_PARSE_ERROR_BAD_VALUE:
 375       DEBUG(D_receive)
 376         debug_printf("DMARC record parse error for %s\n", header_from_sender);
 377       has_dmarc_record = FALSE;
 378       break;
 379     default:
 380       /* everything else, skip dmarc */
 381       DEBUG(D_receive)
 382         debug_printf("DMARC skipping (%d), unsure what to do with %s",
 383                       libdm_status, from_header->text);
 384       has_dmarc_record = FALSE;
 385       break;
 386     }
 387
 388 /* Store the policy string in an expandable variable. */
 389
 390   libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 391   for (c = 0; dmarc_policy_description[c].name; c++)
 392     if (tmp_ans == dmarc_policy_description[c].value)
 393       {
 394       dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
 395       break;
 396       }
 397
 398   /* Can't use exim's string manipulation functions so allocate memory
 399   for libopendmarc using its max hostname length definition. */
 400
 401   dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 402   libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
 403     dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
 404   dmarc_used_domain = string_copy(dmarc_domain);
 405   free(dmarc_domain);
 406
 407   if (libdm_status != DMARC_PARSE_OKAY)
 408     log_write(0, LOG_MAIN|LOG_PANIC,
 409       "failure to read domainname used for DMARC lookup: %s",
 410       opendmarc_policy_status_to_str(libdm_status));
 411
 412   dmarc_policy = libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 413   switch(libdm_status)
 414     {
 415     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 416       dmarc_status = US"norecord";
 417       dmarc_pass_fail = US"none";
 418       dmarc_status_text = US"No DMARC record";
 419       action = DMARC_RESULT_ACCEPT;
 420       break;
 421     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 422       dmarc_status = US"nofrom";
 423       dmarc_pass_fail = US"temperror";
 424       dmarc_status_text = US"No From: domain found";
 425       action = DMARC_RESULT_ACCEPT;
 426       break;
 427     case DMARC_POLICY_NONE:       /* Accept and report */
 428       dmarc_status = US"none";
 429       dmarc_pass_fail = US"none";
 430       dmarc_status_text = US"None, Accept";
 431       action = DMARC_RESULT_ACCEPT;
 432       break;
 433     case DMARC_POLICY_PASS:       /* Explicit accept */
 434       dmarc_status = US"accept";
 435       dmarc_pass_fail = US"pass";
 436       dmarc_status_text = US"Accept";
 437       action = DMARC_RESULT_ACCEPT;
 438       break;
 439     case DMARC_POLICY_REJECT:       /* Explicit reject */
 440       dmarc_status = US"reject";
 441       dmarc_pass_fail = US"fail";
 442       dmarc_status_text = US"Reject";
 443       action = DMARC_RESULT_REJECT;
 444       break;
 445     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 446       dmarc_status = US"quarantine";
 447       dmarc_pass_fail = US"fail";
 448       dmarc_status_text = US"Quarantine";
 449       action = DMARC_RESULT_QUARANTINE;
 450       break;
 451     default:
 452       dmarc_status = US"temperror";
 453       dmarc_pass_fail = US"temperror";
 454       dmarc_status_text = US"Internal Policy Error";
 455       action = DMARC_RESULT_TEMPFAIL;
 456       break;
 457     }
 458
 459   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 460   if (libdm_status != DMARC_PARSE_OKAY)
 461     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 462                              opendmarc_policy_status_to_str(libdm_status));
 463
 464   if (has_dmarc_record)
 465     {
 466     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 467                            "spf_align=%s dkim_align=%s enforcement='%s'",
 468                            spf_sender_domain, dmarc_used_domain,
 469                            sa==DMARC_POLICY_SPF_ALIGNMENT_PASS  ?"yes":"no",
 470                            da==DMARC_POLICY_DKIM_ALIGNMENT_PASS ?"yes":"no",
 471                            dmarc_status_text);
 472     history_file_status = dmarc_write_history_file();
 473     /* Now get the forensic reporting addresses, if any */
 474     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 475     dmarc_send_forensic_report(ruf);
 476     }
 477   }
 478
 479 /* shut down libopendmarc */
 480 if (dmarc_pctx)
 481   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 482 if (!f.dmarc_disable_verify)
 483   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 484
 485 return OK;
 486 }
 487
 488 static int
 489 dmarc_write_history_file()
 490 {
 491 int history_file_fd;
 492 ssize_t written_len;
 493 int tmp_ans;
 494 u_char **rua; /* aggregate report addressees */
 495 uschar *history_buffer = NULL;
 496
 497 if (!dmarc_history_file)
 498   {
 499   DEBUG(D_receive) debug_printf("DMARC history file not set\n");
 500   return DMARC_HIST_DISABLED;
 501   }
 502 history_file_fd = log_create(dmarc_history_file);
 503
 504 if (history_file_fd < 0)
 505   {
 506   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 507                            dmarc_history_file);
 508   return DMARC_HIST_FILE_ERR;
 509   }
 510
 511 /* Generate the contents of the history file */
 512 history_buffer = string_sprintf(
 513   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 514   message_id, primary_hostname, time(NULL), sender_host_address,
 515   header_from_sender, expand_string(US"$sender_address_domain"));
 516
 517 if (spf_response)
 518   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 519   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 520
 521 history_buffer = string_sprintf(
 522   "%s%spdomain %s\npolicy %d\n",
 523   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 524
 525 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 526   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 527     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 528 else
 529   history_buffer = string_sprintf("%srua -\n", history_buffer);
 530
 531 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 532 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 533
 534 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 535 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 536
 537 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 538 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 539
 540 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 541 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 542
 543 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 544 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 545
 546 history_buffer = string_sprintf(
 547   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 548   history_buffer, da, sa, action);
 549
 550 /* Write the contents to the history file */
 551 DEBUG(D_receive)
 552   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 553              (host_checking || f.running_in_test_harness) ? " (not really)" : "");
 554 if (host_checking || f.running_in_test_harness)
 555   {
 556   DEBUG(D_receive)
 557     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 558   }
 559 else
 560   {
 561   written_len = write_to_fd_buf(history_file_fd,
 562                                 history_buffer,
 563                                 Ustrlen(history_buffer));
 564   if (written_len == 0)
 565     {
 566     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 567                            dmarc_history_file);
 568     return DMARC_HIST_WRITE_ERR;
 569     }
 570   (void)close(history_file_fd);
 571   }
 572 return DMARC_HIST_OK;
 573 }
 574
 575
 576 uschar *
 577 dmarc_exim_expand_query(int what)
 578 {
 579 if (f.dmarc_disable_verify || !dmarc_pctx)
 580   return dmarc_exim_expand_defaults(what);
 581
 582 if (what == DMARC_VERIFY_STATUS)
 583   return dmarc_status;
 584 return US"";
 585 }
 586
 587 uschar *
 588 dmarc_exim_expand_defaults(int what)
 589 {
 590 if (what == DMARC_VERIFY_STATUS)
 591   return f.dmarc_disable_verify ?  US"off" : US"none";
 592 return US"";
 593 }
 594
 595
 596 gstring *
 597 authres_dmarc(gstring * g)
 598 {
 599 if (f.dmarc_has_been_checked)
 600   {
 601   g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail);
 602   if (header_from_sender)
 603     g = string_append(g, 2, US" header.from=", header_from_sender);
 604   }
 605 return g;
 606 }
 607
 608 # endif /* SUPPORT_SPF */
 609 #endif /* EXPERIMENTAL_DMARC */
 610 /* vi: aw ai sw=2
 611  */