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 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 (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)
 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(dmarc_tld_file, NULL, NULL, NULL))
 118   {
 119   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
 120                        dmarc_tld_file, 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 (!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 int   c;
 161 uschar *recipient, *save_sender;
 162 BOOL  send_status = FALSE;
 163 error_block *eblock = NULL;
 164 FILE *message_file = NULL;
 165
 166 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 167 if (!dmarc_enable_forensic)
 168   return;
 169
 170 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 171    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 172    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 173    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 174    )
 175   if (ruf)
 176     {
 177     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 178     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 179     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 180     eblock = add_to_eblock(eblock, US"SPF Alignment",
 181                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 182     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 183                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 184     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 185     /* Set a sane default envelope sender */
 186     dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 187                dsn_from ? dsn_from :
 188                string_sprintf("do-not-reply@%s",primary_hostname);
 189     for (c = 0; ruf[c]; c++)
 190       {
 191       recipient = string_copylc(ruf[c]);
 192       if (Ustrncmp(recipient, "mailto:",7))
 193         continue;
 194       /* Move to first character past the colon */
 195       recipient += 7;
 196       DEBUG(D_receive)
 197         debug_printf("DMARC forensic report to %s%s\n", recipient,
 198              (host_checking || running_in_test_harness) ? " (not really)" : "");
 199       if (host_checking || running_in_test_harness)
 200         continue;
 201
 202       save_sender = sender_address;
 203       sender_address = recipient;
 204       send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 205                                    header_list, message_file, FALSE);
 206       sender_address = save_sender;
 207       if (!send_status)
 208         log_write(0, LOG_MAIN|LOG_PANIC,
 209           "failure to send DMARC forensic report to %s", recipient);
 210       }
 211     }
 212 }
 213
 214 /* dmarc_process adds the envelope sender address to the existing
 215 context (if any), retrieves the result, sets up expansion
 216 strings and evaluates the condition outcome. */
 217
 218 int
 219 dmarc_process()
 220 {
 221 int sr, origin;             /* used in SPF section */
 222 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 223 int tmp_ans, c;
 224 pdkim_signature * sig = dkim_signatures;
 225 BOOL has_dmarc_record = TRUE;
 226 u_char **ruf; /* forensic report addressees, if called for */
 227
 228 /* ACLs have "control=dmarc_disable_verify" */
 229 if (dmarc_disable_verify)
 230   return OK;
 231
 232 /* Store the header From: sender domain for this part of DMARC.
 233  * If there is no from_header struct, then it's likely this message
 234  * is locally generated and relying on fixups to add it.  Just skip
 235  * the entire DMARC system if we can't find a From: header....or if
 236  * there was a previous error.
 237  */
 238 if (!from_header)
 239   {
 240   DEBUG(D_receive) debug_printf("DMARC: no From: header\n");
 241   dmarc_abort = TRUE;
 242   }
 243 else if (!dmarc_abort)
 244   {
 245   uschar * errormsg;
 246   int dummy, domain;
 247   uschar * p;
 248   uschar saveend;
 249
 250   parse_allow_group = TRUE;
 251   p = parse_find_address_end(from_header->text, FALSE);
 252   saveend = *p; *p = '\0';
 253   if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 254                               &dummy, &dummy, &domain, FALSE)))
 255     header_from_sender += domain;
 256   *p = saveend;
 257
 258   /* The opendmarc library extracts the domain from the email address, but
 259    * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 260   if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 261     dmarc_abort = TRUE;
 262   libdm_status = dmarc_abort
 263     ? DMARC_PARSE_OKAY
 264     : opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 265   if (libdm_status != DMARC_PARSE_OKAY)
 266     {
 267     log_write(0, LOG_MAIN|LOG_PANIC,
 268               "failure to store header From: in DMARC: %s, header was '%s'",
 269               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 270     dmarc_abort = TRUE;
 271     }
 272   }
 273
 274 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 275  * instead do this in the ACLs.  */
 276 if (!dmarc_abort && !sender_host_authenticated)
 277   {
 278   uschar * dmarc_domain;
 279
 280   /* Use the envelope sender domain for this part of DMARC */
 281   spf_sender_domain = expand_string(US"$sender_address_domain");
 282   if (!spf_response)
 283     {
 284     /* No spf data means null envelope sender so generate a domain name
 285      * from the sender_helo_name  */
 286     if (!spf_sender_domain)
 287       {
 288       spf_sender_domain = sender_helo_name;
 289       log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 290                              spf_sender_domain);
 291       DEBUG(D_receive)
 292         debug_printf("DMARC using synthesized SPF sender domain = %s\n",
 293           spf_sender_domain);
 294       }
 295     dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 296     dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
 297     origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 298     spf_human_readable = US"";
 299     }
 300   else
 301     {
 302     sr = spf_response->result;
 303     dmarc_spf_result = sr == SPF_RESULT_NEUTRAL  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 304                        sr == SPF_RESULT_PASS     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 305                        sr == SPF_RESULT_FAIL     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 306                        sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 307                        DMARC_POLICY_SPF_OUTCOME_NONE;
 308     dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL   ? ARES_RESULT_NEUTRAL :
 309                             sr == SPF_RESULT_PASS      ? ARES_RESULT_PASS :
 310                             sr == SPF_RESULT_FAIL      ? ARES_RESULT_FAIL :
 311                             sr == SPF_RESULT_SOFTFAIL  ? ARES_RESULT_SOFTFAIL :
 312                             sr == SPF_RESULT_NONE      ? ARES_RESULT_NONE :
 313                             sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
 314                             sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
 315                             ARES_RESULT_UNKNOWN;
 316     origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 317     spf_human_readable = US spf_response->header_comment;
 318     DEBUG(D_receive)
 319       debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 320     }
 321   if (strcmp( CCS spf_sender_domain, "") == 0)
 322     dmarc_abort = TRUE;
 323   if (!dmarc_abort)
 324     {
 325     libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 326                                 dmarc_spf_result, origin, spf_human_readable);
 327     if (libdm_status != DMARC_PARSE_OKAY)
 328       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 329                            opendmarc_policy_status_to_str(libdm_status));
 330     }
 331
 332   /* Now we cycle through the dkim signature results and put into
 333    * the opendmarc context, further building the DMARC reply.  */
 334   dkim_history_buffer = US"";
 335   while (sig)
 336     {
 337     int dkim_result, dkim_ares_result, vs, ves;
 338
 339     vs  = sig->verify_status & ~PDKIM_VERIFY_POLICY;
 340     ves = sig->verify_ext_status;
 341     dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 342                   vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 343                   vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 344                   DMARC_POLICY_DKIM_OUTCOME_NONE;
 345     libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, US sig->domain,
 346                                                dkim_result, US"");
 347     DEBUG(D_receive)
 348       debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 349     if (libdm_status != DMARC_PARSE_OKAY)
 350       log_write(0, LOG_MAIN|LOG_PANIC,
 351                 "failure to store dkim (%s) for DMARC: %s",
 352                 sig->domain, opendmarc_policy_status_to_str(libdm_status));
 353
 354     dkim_ares_result =
 355       vs == PDKIM_VERIFY_PASS    ? ARES_RESULT_PASS :
 356       vs == PDKIM_VERIFY_FAIL    ? ARES_RESULT_FAIL :
 357       vs == PDKIM_VERIFY_NONE    ? ARES_RESULT_NONE :
 358       vs == PDKIM_VERIFY_INVALID ?
 359        ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
 360        ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE        ? ARES_RESULT_PERMERROR :
 361        ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD   ? ARES_RESULT_PERMERROR :
 362        ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT      ? ARES_RESULT_PERMERROR :
 363        ARES_RESULT_UNKNOWN :
 364       ARES_RESULT_UNKNOWN;
 365     dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 366                                          sig->domain, dkim_ares_result);
 367     sig = sig->next;
 368     }
 369   libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 370   switch (libdm_status)
 371     {
 372     case DMARC_DNS_ERROR_NXDOMAIN:
 373     case DMARC_DNS_ERROR_NO_RECORD:
 374       DEBUG(D_receive)
 375         debug_printf("DMARC no record found for %s\n", header_from_sender);
 376       has_dmarc_record = FALSE;
 377       break;
 378     case DMARC_PARSE_OKAY:
 379       DEBUG(D_receive)
 380         debug_printf("DMARC record found for %s\n", header_from_sender);
 381       break;
 382     case DMARC_PARSE_ERROR_BAD_VALUE:
 383       DEBUG(D_receive)
 384         debug_printf("DMARC record parse error for %s\n", header_from_sender);
 385       has_dmarc_record = FALSE;
 386       break;
 387     default:
 388       /* everything else, skip dmarc */
 389       DEBUG(D_receive)
 390         debug_printf("DMARC skipping (%d), unsure what to do with %s",
 391                       libdm_status, from_header->text);
 392       has_dmarc_record = FALSE;
 393       break;
 394     }
 395
 396 /* Store the policy string in an expandable variable. */
 397
 398   libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 399   for (c = 0; dmarc_policy_description[c].name; c++)
 400     if (tmp_ans == dmarc_policy_description[c].value)
 401       {
 402       dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
 403       break;
 404       }
 405
 406   /* Can't use exim's string manipulation functions so allocate memory
 407   for libopendmarc using its max hostname length definition. */
 408
 409   dmarc_domain = US calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 410   libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
 411     dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
 412   dmarc_used_domain = string_copy(dmarc_domain);
 413   free(dmarc_domain);
 414
 415   if (libdm_status != DMARC_PARSE_OKAY)
 416     log_write(0, LOG_MAIN|LOG_PANIC,
 417       "failure to read domainname used for DMARC lookup: %s",
 418       opendmarc_policy_status_to_str(libdm_status));
 419
 420   dmarc_policy = libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 421   switch(libdm_status)
 422     {
 423     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 424       dmarc_status = US"norecord";
 425       dmarc_pass_fail = US"none";
 426       dmarc_status_text = US"No DMARC record";
 427       action = DMARC_RESULT_ACCEPT;
 428       break;
 429     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 430       dmarc_status = US"nofrom";
 431       dmarc_pass_fail = US"temperror";
 432       dmarc_status_text = US"No From: domain found";
 433       action = DMARC_RESULT_ACCEPT;
 434       break;
 435     case DMARC_POLICY_NONE:       /* Accept and report */
 436       dmarc_status = US"none";
 437       dmarc_pass_fail = US"none";
 438       dmarc_status_text = US"None, Accept";
 439       action = DMARC_RESULT_ACCEPT;
 440       break;
 441     case DMARC_POLICY_PASS:       /* Explicit accept */
 442       dmarc_status = US"accept";
 443       dmarc_pass_fail = US"pass";
 444       dmarc_status_text = US"Accept";
 445       action = DMARC_RESULT_ACCEPT;
 446       break;
 447     case DMARC_POLICY_REJECT:       /* Explicit reject */
 448       dmarc_status = US"reject";
 449       dmarc_pass_fail = US"fail";
 450       dmarc_status_text = US"Reject";
 451       action = DMARC_RESULT_REJECT;
 452       break;
 453     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 454       dmarc_status = US"quarantine";
 455       dmarc_pass_fail = US"fail";
 456       dmarc_status_text = US"Quarantine";
 457       action = DMARC_RESULT_QUARANTINE;
 458       break;
 459     default:
 460       dmarc_status = US"temperror";
 461       dmarc_pass_fail = US"temperror";
 462       dmarc_status_text = US"Internal Policy Error";
 463       action = DMARC_RESULT_TEMPFAIL;
 464       break;
 465     }
 466
 467   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 468   if (libdm_status != DMARC_PARSE_OKAY)
 469     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 470                              opendmarc_policy_status_to_str(libdm_status));
 471
 472   if (has_dmarc_record)
 473     {
 474     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 475                            "spf_align=%s dkim_align=%s enforcement='%s'",
 476                            spf_sender_domain, dmarc_used_domain,
 477                            sa==DMARC_POLICY_SPF_ALIGNMENT_PASS  ?"yes":"no",
 478                            da==DMARC_POLICY_DKIM_ALIGNMENT_PASS ?"yes":"no",
 479                            dmarc_status_text);
 480     history_file_status = dmarc_write_history_file();
 481     /* Now get the forensic reporting addresses, if any */
 482     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 483     dmarc_send_forensic_report(ruf);
 484     }
 485   }
 486
 487 /* shut down libopendmarc */
 488 if (dmarc_pctx)
 489   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 490 if (!dmarc_disable_verify)
 491   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 492
 493 return OK;
 494 }
 495
 496 static int
 497 dmarc_write_history_file()
 498 {
 499 int history_file_fd;
 500 ssize_t written_len;
 501 int tmp_ans;
 502 u_char **rua; /* aggregate report addressees */
 503 uschar *history_buffer = NULL;
 504
 505 if (!dmarc_history_file)
 506   {
 507   DEBUG(D_receive) debug_printf("DMARC history file not set\n");
 508   return DMARC_HIST_DISABLED;
 509   }
 510 history_file_fd = log_create(dmarc_history_file);
 511
 512 if (history_file_fd < 0)
 513   {
 514   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 515                            dmarc_history_file);
 516   return DMARC_HIST_FILE_ERR;
 517   }
 518
 519 /* Generate the contents of the history file */
 520 history_buffer = string_sprintf(
 521   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 522   message_id, primary_hostname, time(NULL), sender_host_address,
 523   header_from_sender, expand_string(US"$sender_address_domain"));
 524
 525 if (spf_response)
 526   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 527   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 528
 529 history_buffer = string_sprintf(
 530   "%s%spdomain %s\npolicy %d\n",
 531   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 532
 533 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 534   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 535     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 536 else
 537   history_buffer = string_sprintf("%srua -\n", history_buffer);
 538
 539 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 540 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 541
 542 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 543 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 544
 545 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 546 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 547
 548 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 549 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 550
 551 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 552 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 553
 554 history_buffer = string_sprintf(
 555   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 556   history_buffer, da, sa, action);
 557
 558 /* Write the contents to the history file */
 559 DEBUG(D_receive)
 560   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 561              (host_checking || running_in_test_harness) ? " (not really)" : "");
 562 if (host_checking || running_in_test_harness)
 563   {
 564   DEBUG(D_receive)
 565     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 566   }
 567 else
 568   {
 569   written_len = write_to_fd_buf(history_file_fd,
 570                                 history_buffer,
 571                                 Ustrlen(history_buffer));
 572   if (written_len == 0)
 573     {
 574     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 575                            dmarc_history_file);
 576     return DMARC_HIST_WRITE_ERR;
 577     }
 578   (void)close(history_file_fd);
 579   }
 580 return DMARC_HIST_OK;
 581 }
 582
 583
 584 uschar *
 585 dmarc_exim_expand_query(int what)
 586 {
 587 if (dmarc_disable_verify || !dmarc_pctx)
 588   return dmarc_exim_expand_defaults(what);
 589
 590 if (what == DMARC_VERIFY_STATUS)
 591   return dmarc_status;
 592 return US"";
 593 }
 594
 595 uschar *
 596 dmarc_exim_expand_defaults(int what)
 597 {
 598 if (what == DMARC_VERIFY_STATUS)
 599   return dmarc_disable_verify ?  US"off" : US"none";
 600 return US"";
 601 }
 602
 603
 604 gstring *
 605 authres_dmarc(gstring * g)
 606 {
 607 if (dmarc_has_been_checked)
 608   {
 609   g = string_append(g, 2, US";\n\tdmarc=", dmarc_pass_fail);
 610   if (header_from_sender)
 611     g = string_append(g, 2, US" header.from=", header_from_sender);
 612   }
 613 return g;
 614 }
 615
 616 # endif /* SUPPORT_SPF */
 617 #endif /* EXPERIMENTAL_DMARC */
 618 /* vi: aw ai sw=2
 619  */