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 extern pdkim_signature  *dkim_signatures;
  32 header_line *from_header   = NULL;
  33 extern SPF_response_t   *spf_response;
  34 int dmarc_spf_ares_result  = 0;
  35 uschar *spf_sender_domain  = NULL;
  36 uschar *spf_human_readable = NULL;
  37 u_char *header_from_sender = NULL;
  38 int history_file_status    = DMARC_HIST_OK;
  39 uschar *dkim_history_buffer= NULL;
  40
  41 typedef struct dmarc_exim_p {
  42   uschar *name;
  43   int    value;
  44 } dmarc_exim_p;
  45
  46 static dmarc_exim_p dmarc_policy_description[] = {
  47   /* name               value */
  48   { US"",           DMARC_RECORD_P_UNSPECIFIED },
  49   { US"none",       DMARC_RECORD_P_NONE },
  50   { US"quarantine", DMARC_RECORD_P_QUARANTINE },
  51   { US"reject",     DMARC_RECORD_P_REJECT },
  52   { NULL,           0 }
  53 };
  54 /* Accept an error_block struct, initialize if empty, parse to the
  55  * end, and append the two strings passed to it.  Used for adding
  56  * variable amounts of value:pair data to the forensic emails. */
  57
  58 static error_block *
  59 add_to_eblock(error_block *eblock, uschar *t1, uschar *t2)
  60 {
  61 error_block *eb = store_malloc(sizeof(error_block));
  62 if (eblock == NULL)
  63   eblock = eb;
  64 else
  65   {
  66   /* Find the end of the eblock struct and point it at eb */
  67   error_block *tmp = eblock;
  68   while(tmp->next != NULL)
  69     tmp = tmp->next;
  70   tmp->next = eb;
  71   }
  72 eb->text1 = t1;
  73 eb->text2 = t2;
  74 eb->next  = NULL;
  75 return eblock;
  76 }
  77
  78 /* dmarc_init sets up a context that can be re-used for several
  79    messages on the same SMTP connection (that come from the
  80    same host with the same HELO string) */
  81
  82 int
  83 dmarc_init()
  84 {
  85 int *netmask   = NULL;   /* Ignored */
  86 int is_ipv6    = 0;
  87 char *tld_file = dmarc_tld_file ? CS dmarc_tld_file : DMARC_TLD_FILE;
  88
  89 /* Set some sane defaults.  Also clears previous results when
  90  * multiple messages in one connection. */
  91 dmarc_pctx         = NULL;
  92 dmarc_status       = US"none";
  93 dmarc_abort        = FALSE;
  94 dmarc_pass_fail    = US"skipped";
  95 dmarc_used_domain  = US"";
  96 dmarc_has_been_checked = FALSE;
  97 header_from_sender = NULL;
  98 spf_sender_domain  = NULL;
  99 spf_human_readable = NULL;
 100
 101 /* ACLs have "control=dmarc_disable_verify" */
 102 if (dmarc_disable_verify == TRUE)
 103   return OK;
 104
 105 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
 106 dmarc_ctx.nscount = 0;
 107 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
 108 if (libdm_status != DMARC_PARSE_OKAY)
 109   {
 110   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
 111                        opendmarc_policy_status_to_str(libdm_status));
 112   dmarc_abort = TRUE;
 113   }
 114 if (dmarc_tld_file == NULL)
 115   dmarc_abort = TRUE;
 116 else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
 117   {
 118   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
 119                        tld_file, errno);
 120   dmarc_abort = TRUE;
 121   }
 122 if (sender_host_address == NULL)
 123   dmarc_abort = TRUE;
 124 /* This catches locally originated email and startup errors above. */
 125 if (!dmarc_abort)
 126   {
 127   is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6;
 128   dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
 129   if (dmarc_pctx == NULL)
 130     {
 131     log_write(0, LOG_MAIN|LOG_PANIC,
 132       "DMARC failure creating policy context: ip=%s", sender_host_address);
 133     dmarc_abort = TRUE;
 134     }
 135   }
 136
 137 return OK;
 138 }
 139
 140
 141 /* dmarc_store_data stores the header data so that subsequent
 142 dmarc_process can access the data */
 143
 144 int
 145 dmarc_store_data(header_line *hdr)
 146 {
 147 /* No debug output because would change every test debug output */
 148 if (!dmarc_disable_verify)
 149   from_header = hdr;
 150 return OK;
 151 }
 152
 153
 154 static void
 155 dmarc_send_forensic_report(u_char **ruf)
 156 {
 157 int   c;
 158 uschar *recipient, *save_sender;
 159 BOOL  send_status = FALSE;
 160 error_block *eblock = NULL;
 161 FILE *message_file = NULL;
 162
 163 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 164 if (!dmarc_enable_forensic)
 165   return;
 166
 167 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 168    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 169    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 170    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 171    )
 172   if (ruf)
 173     {
 174     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 175     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 176     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 177     eblock = add_to_eblock(eblock, US"SPF Alignment",
 178                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 179     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 180                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 181     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 182     /* Set a sane default envelope sender */
 183     dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 184                dsn_from ? dsn_from :
 185                string_sprintf("do-not-reply@%s",primary_hostname);
 186     for (c = 0; ruf[c]; c++)
 187       {
 188       recipient = string_copylc(ruf[c]);
 189       if (Ustrncmp(recipient, "mailto:",7))
 190         continue;
 191       /* Move to first character past the colon */
 192       recipient += 7;
 193       DEBUG(D_receive)
 194         debug_printf("DMARC forensic report to %s%s\n", recipient,
 195              (host_checking || running_in_test_harness) ? " (not really)" : "");
 196       if (host_checking || running_in_test_harness)
 197         continue;
 198
 199       save_sender = sender_address;
 200       sender_address = recipient;
 201       send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 202                                    header_list, message_file, FALSE);
 203       sender_address = save_sender;
 204       if (!send_status)
 205         log_write(0, LOG_MAIN|LOG_PANIC,
 206           "failure to send DMARC forensic report to %s", recipient);
 207       }
 208     }
 209 }
 210
 211 /* dmarc_process adds the envelope sender address to the existing
 212 context (if any), retrieves the result, sets up expansion
 213 strings and evaluates the condition outcome. */
 214
 215 int
 216 dmarc_process()
 217 {
 218 int sr, origin;             /* used in SPF section */
 219 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 220 int tmp_ans, c;
 221 pdkim_signature *sig  = NULL;
 222 BOOL has_dmarc_record = TRUE;
 223 u_char **ruf; /* forensic report addressees, if called for */
 224
 225 /* ACLs have "control=dmarc_disable_verify" */
 226 if (dmarc_disable_verify)
 227   return OK;
 228
 229 /* Store the header From: sender domain for this part of DMARC.
 230  * If there is no from_header struct, then it's likely this message
 231  * is locally generated and relying on fixups to add it.  Just skip
 232  * the entire DMARC system if we can't find a From: header....or if
 233  * there was a previous error.
 234  */
 235 if (!from_header || dmarc_abort)
 236   dmarc_abort = TRUE;
 237 else
 238   {
 239     uschar * errormsg;
 240     int dummy, domain;
 241     uschar * p;
 242     uschar saveend;
 243
 244     parse_allow_group = TRUE;
 245     p = parse_find_address_end(from_header->text, FALSE);
 246     saveend = *p; *p = '\0';
 247     if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 248                                 &dummy, &dummy, &domain, FALSE)))
 249       header_from_sender += domain;
 250     *p = saveend;
 251
 252     /* The opendmarc library extracts the domain from the email address, but
 253      * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 254     if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 255       dmarc_abort = TRUE;
 256     libdm_status = dmarc_abort ?
 257       DMARC_PARSE_OKAY :
 258       opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 259     if (libdm_status != DMARC_PARSE_OKAY)
 260     {
 261     log_write(0, LOG_MAIN|LOG_PANIC,
 262               "failure to store header From: in DMARC: %s, header was '%s'",
 263               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 264     dmarc_abort = TRUE;
 265     }
 266   }
 267
 268 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 269  * instead do this in the ACLs.  */
 270 if (!dmarc_abort && !sender_host_authenticated)
 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   sig = dkim_signatures;
 327   dkim_history_buffer = US"";
 328   while (sig)
 329     {
 330     int dkim_result, dkim_ares_result, vs, ves;
 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   uschar *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   libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 413   dmarc_policy = libdm_status;
 414   switch(libdm_status)
 415     {
 416     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 417       dmarc_status = US"norecord";
 418       dmarc_pass_fail = US"none";
 419       dmarc_status_text = US"No DMARC record";
 420       action = DMARC_RESULT_ACCEPT;
 421       break;
 422     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 423       dmarc_status = US"nofrom";
 424       dmarc_pass_fail = US"temperror";
 425       dmarc_status_text = US"No From: domain found";
 426       action = DMARC_RESULT_ACCEPT;
 427       break;
 428     case DMARC_POLICY_NONE:       /* Accept and report */
 429       dmarc_status = US"none";
 430       dmarc_pass_fail = US"none";
 431       dmarc_status_text = US"None, Accept";
 432       action = DMARC_RESULT_ACCEPT;
 433       break;
 434     case DMARC_POLICY_PASS:       /* Explicit accept */
 435       dmarc_status = US"accept";
 436       dmarc_pass_fail = US"pass";
 437       dmarc_status_text = US"Accept";
 438       action = DMARC_RESULT_ACCEPT;
 439       break;
 440     case DMARC_POLICY_REJECT:       /* Explicit reject */
 441       dmarc_status = US"reject";
 442       dmarc_pass_fail = US"fail";
 443       dmarc_status_text = US"Reject";
 444       action = DMARC_RESULT_REJECT;
 445       break;
 446     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 447       dmarc_status = US"quarantine";
 448       dmarc_pass_fail = US"fail";
 449       dmarc_status_text = US"Quarantine";
 450       action = DMARC_RESULT_QUARANTINE;
 451       break;
 452     default:
 453       dmarc_status = US"temperror";
 454       dmarc_pass_fail = US"temperror";
 455       dmarc_status_text = US"Internal Policy Error";
 456       action = DMARC_RESULT_TEMPFAIL;
 457       break;
 458     }
 459
 460   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 461   if (libdm_status != DMARC_PARSE_OKAY)
 462     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 463                              opendmarc_policy_status_to_str(libdm_status));
 464
 465   if (has_dmarc_record)
 466     {
 467     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 468                            "spf_align=%s dkim_align=%s enforcement='%s'",
 469                            spf_sender_domain, dmarc_used_domain,
 470                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
 471                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
 472                            dmarc_status_text);
 473     history_file_status = dmarc_write_history_file();
 474     /* Now get the forensic reporting addresses, if any */
 475     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 476     dmarc_send_forensic_report(ruf);
 477     }
 478   }
 479
 480 /* shut down libopendmarc */
 481 if (dmarc_pctx)
 482   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 483 if (!dmarc_disable_verify)
 484   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 485
 486 return OK;
 487 }
 488
 489 int
 490 dmarc_write_history_file()
 491 {
 492 int history_file_fd;
 493 ssize_t written_len;
 494 int tmp_ans;
 495 u_char **rua; /* aggregate report addressees */
 496 uschar *history_buffer = NULL;
 497
 498 if (!dmarc_history_file)
 499   return DMARC_HIST_DISABLED;
 500 history_file_fd = log_create(dmarc_history_file);
 501
 502 if (history_file_fd < 0)
 503   {
 504   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 505                            dmarc_history_file);
 506   return DMARC_HIST_FILE_ERR;
 507   }
 508
 509 /* Generate the contents of the history file */
 510 history_buffer = string_sprintf(
 511   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 512   message_id, primary_hostname, time(NULL), sender_host_address,
 513   header_from_sender, expand_string(US"$sender_address_domain"));
 514
 515 if (spf_response)
 516   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 517   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 518
 519 history_buffer = string_sprintf(
 520   "%s%spdomain %s\npolicy %d\n",
 521   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 522
 523 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 524   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 525     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 526 else
 527   history_buffer = string_sprintf("%srua -\n", history_buffer);
 528
 529 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 530 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 531
 532 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 533 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 534
 535 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 536 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 537
 538 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 539 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 540
 541 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 542 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 543
 544 history_buffer = string_sprintf(
 545   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 546   history_buffer, da, sa, action);
 547
 548 /* Write the contents to the history file */
 549 DEBUG(D_receive)
 550   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 551              (host_checking || running_in_test_harness) ? " (not really)" : "");
 552 if (host_checking || running_in_test_harness)
 553   {
 554   DEBUG(D_receive)
 555     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 556   }
 557 else
 558   {
 559   written_len = write_to_fd_buf(history_file_fd,
 560                                 history_buffer,
 561                                 Ustrlen(history_buffer));
 562   if (written_len == 0)
 563     {
 564     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 565                            dmarc_history_file);
 566     return DMARC_HIST_WRITE_ERR;
 567     }
 568   (void)close(history_file_fd);
 569   }
 570 return DMARC_HIST_OK;
 571 }
 572
 573
 574 uschar *
 575 dmarc_exim_expand_query(int what)
 576 {
 577 if (dmarc_disable_verify || !dmarc_pctx)
 578   return dmarc_exim_expand_defaults(what);
 579
 580 if (what == DMARC_VERIFY_STATUS)
 581   return dmarc_status;
 582 return US"";
 583 }
 584
 585 uschar *
 586 dmarc_exim_expand_defaults(int what)
 587 {
 588 if (what == DMARC_VERIFY_STATUS)
 589   return dmarc_disable_verify ?  US"off" : US"none";
 590 return US"";
 591 }
 592
 593
 594 gstring *
 595 authres_dmarc(gstring * g)
 596 {
 597 g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail);
 598 if (header_from_sender)
 599   g = string_append(g, 2, US"header.from=", header_from_sender);
 600 return g;
 601 }
 602
 603 # endif /* SUPPORT_SPF */
 604 #endif /* EXPERIMENTAL_DMARC */
 605 /* vi: aw ai sw=2
 606  */