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 EXPERIMENTAL_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   { 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 dmarc_init()
  82 {
  83 int *netmask   = NULL;   /* Ignored */
  84 int is_ipv6    = 0;
  85 char *tld_file = (dmarc_tld_file == NULL) ?
  86                  DMARC_TLD_FILE : (char *)dmarc_tld_file;
  87
  88 /* Set some sane defaults.  Also clears previous results when
  89  * multiple messages in one connection. */
  90 dmarc_pctx         = NULL;
  91 dmarc_status       = US"none";
  92 dmarc_abort        = FALSE;
  93 dmarc_pass_fail    = US"skipped";
  94 dmarc_used_domain  = US"";
  95 dmarc_ar_header    = NULL;
  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 dmarc_store_data(header_line *hdr) {
 145   /* No debug output because would change every test debug output */
 146   if (dmarc_disable_verify != TRUE)
 147     from_header = hdr;
 148   return OK;
 149 }
 150
 151
 152 static void
 153 dmarc_send_forensic_report(u_char **ruf)
 154 {
 155 int   c;
 156 uschar *recipient, *save_sender;
 157 BOOL  send_status = FALSE;
 158 error_block *eblock = NULL;
 159 FILE *message_file = NULL;
 160
 161 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 162 if (!dmarc_enable_forensic)
 163   return;
 164
 165 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 166    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 167    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 168    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 169    )
 170   if (ruf)
 171     {
 172     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 173     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 174     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 175     eblock = add_to_eblock(eblock, US"SPF Alignment",
 176                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 177     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 178                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 179     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 180     /* Set a sane default envelope sender */
 181     dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 182                dsn_from ? dsn_from :
 183                string_sprintf("do-not-reply@%s",primary_hostname);
 184     for (c = 0; ruf[c]; c++)
 185       {
 186       recipient = string_copylc(ruf[c]);
 187       if (Ustrncmp(recipient, "mailto:",7))
 188         continue;
 189       /* Move to first character past the colon */
 190       recipient += 7;
 191       DEBUG(D_receive)
 192         debug_printf("DMARC forensic report to %s%s\n", recipient,
 193              (host_checking || running_in_test_harness) ? " (not really)" : "");
 194       if (host_checking || running_in_test_harness)
 195         continue;
 196
 197       save_sender = sender_address;
 198       sender_address = recipient;
 199       send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 200                                    header_list, message_file, FALSE);
 201       sender_address = save_sender;
 202       if (!send_status)
 203         log_write(0, LOG_MAIN|LOG_PANIC,
 204           "failure to send DMARC forensic report to %s", recipient);
 205       }
 206     }
 207 }
 208
 209 /* dmarc_process adds the envelope sender address to the existing
 210    context (if any), retrieves the result, sets up expansion
 211    strings and evaluates the condition outcome. */
 212
 213 int
 214 dmarc_process()
 215 {
 216 int sr, origin;             /* used in SPF section */
 217 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 218 int tmp_ans, c;
 219 pdkim_signature *sig  = NULL;
 220 BOOL has_dmarc_record = TRUE;
 221 u_char **ruf; /* forensic report addressees, if called for */
 222
 223 /* ACLs have "control=dmarc_disable_verify" */
 224 if (dmarc_disable_verify)
 225   {
 226   dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 227   return OK;
 228   }
 229
 230 /* Store the header From: sender domain for this part of DMARC.
 231  * If there is no from_header struct, then it's likely this message
 232  * is locally generated and relying on fixups to add it.  Just skip
 233  * the entire DMARC system if we can't find a From: header....or if
 234  * there was a previous error.
 235  */
 236 if (!from_header || dmarc_abort)
 237   dmarc_abort = TRUE;
 238 else
 239   {
 240     uschar * errormsg;
 241     int dummy, domain;
 242     uschar * p;
 243     uschar saveend;
 244
 245     parse_allow_group = TRUE;
 246     p = parse_find_address_end(from_header->text, FALSE);
 247     saveend = *p; *p = '\0';
 248     if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 249                                 &dummy, &dummy, &domain, FALSE)))
 250       header_from_sender += domain;
 251     *p = saveend;
 252
 253     /* The opendmarc library extracts the domain from the email address, but
 254      * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 255     if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 256       dmarc_abort = TRUE;
 257     libdm_status = dmarc_abort ?
 258       DMARC_PARSE_OKAY :
 259       opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 260     if (libdm_status != DMARC_PARSE_OKAY)
 261     {
 262     log_write(0, LOG_MAIN|LOG_PANIC,
 263               "failure to store header From: in DMARC: %s, header was '%s'",
 264               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 265     dmarc_abort = TRUE;
 266     }
 267   }
 268
 269 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 270  * instead do this in the ACLs.  */
 271 if (!dmarc_abort && !sender_host_authenticated)
 272   {
 273   /* Use the envelope sender domain for this part of DMARC */
 274   spf_sender_domain = expand_string(US"$sender_address_domain");
 275   if (!spf_response)
 276     {
 277     /* No spf data means null envelope sender so generate a domain name
 278      * from the sender_helo_name  */
 279     if (!spf_sender_domain)
 280       {
 281       spf_sender_domain = sender_helo_name;
 282       log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 283                              spf_sender_domain);
 284       DEBUG(D_receive)
 285         debug_printf("DMARC using synthesized SPF sender domain = %s\n",
 286           spf_sender_domain);
 287       }
 288     dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 289     dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
 290     origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 291     spf_human_readable = US"";
 292     }
 293   else
 294     {
 295     sr = spf_response->result;
 296     dmarc_spf_result = sr == SPF_RESULT_NEUTRAL  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 297                        sr == SPF_RESULT_PASS     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 298                        sr == SPF_RESULT_FAIL     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 299                        sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 300                        DMARC_POLICY_SPF_OUTCOME_NONE;
 301     dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL   ? ARES_RESULT_NEUTRAL :
 302                             sr == SPF_RESULT_PASS      ? ARES_RESULT_PASS :
 303                             sr == SPF_RESULT_FAIL      ? ARES_RESULT_FAIL :
 304                             sr == SPF_RESULT_SOFTFAIL  ? ARES_RESULT_SOFTFAIL :
 305                             sr == SPF_RESULT_NONE      ? ARES_RESULT_NONE :
 306                             sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
 307                             sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
 308                             ARES_RESULT_UNKNOWN;
 309     origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 310     spf_human_readable = (uschar *)spf_response->header_comment;
 311     DEBUG(D_receive)
 312       debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 313     }
 314   if (strcmp( CCS spf_sender_domain, "") == 0)
 315     dmarc_abort = TRUE;
 316   if (!dmarc_abort)
 317     {
 318     libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 319                                 dmarc_spf_result, origin, spf_human_readable);
 320     if (libdm_status != DMARC_PARSE_OKAY)
 321       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 322                            opendmarc_policy_status_to_str(libdm_status));
 323     }
 324
 325   /* Now we cycle through the dkim signature results and put into
 326    * the opendmarc context, further building the DMARC reply.  */
 327   sig = dkim_signatures;
 328   dkim_history_buffer = US"";
 329   while (sig)
 330     {
 331     int dkim_result, dkim_ares_result, vs, ves;
 332     vs  = sig->verify_status;
 333     ves = sig->verify_ext_status;
 334     dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 335                   vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 336                   vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 337                   DMARC_POLICY_DKIM_OUTCOME_NONE;
 338     libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
 339                                                dkim_result, US"");
 340     DEBUG(D_receive)
 341       debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 342     if (libdm_status != DMARC_PARSE_OKAY)
 343       log_write(0, LOG_MAIN|LOG_PANIC,
 344                 "failure to store dkim (%s) for DMARC: %s",
 345                 sig->domain, opendmarc_policy_status_to_str(libdm_status));
 346
 347     dkim_ares_result =
 348       vs == PDKIM_VERIFY_PASS    ? ARES_RESULT_PASS :
 349       vs == PDKIM_VERIFY_FAIL    ? ARES_RESULT_FAIL :
 350       vs == PDKIM_VERIFY_NONE    ? ARES_RESULT_NONE :
 351       vs == PDKIM_VERIFY_INVALID ?
 352        ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
 353        ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE        ? ARES_RESULT_PERMERROR :
 354        ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD   ? ARES_RESULT_PERMERROR :
 355        ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT      ? ARES_RESULT_PERMERROR :
 356        ARES_RESULT_UNKNOWN :
 357       ARES_RESULT_UNKNOWN;
 358     dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 359                                          sig->domain, dkim_ares_result);
 360     sig = sig->next;
 361     }
 362   libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 363   switch (libdm_status)
 364     {
 365     case DMARC_DNS_ERROR_NXDOMAIN:
 366     case DMARC_DNS_ERROR_NO_RECORD:
 367       DEBUG(D_receive)
 368         debug_printf("DMARC no record found for %s\n", header_from_sender);
 369       has_dmarc_record = FALSE;
 370       break;
 371     case DMARC_PARSE_OKAY:
 372       DEBUG(D_receive)
 373         debug_printf("DMARC record found for %s\n", header_from_sender);
 374       break;
 375     case DMARC_PARSE_ERROR_BAD_VALUE:
 376       DEBUG(D_receive)
 377         debug_printf("DMARC record parse error for %s\n", header_from_sender);
 378       has_dmarc_record = FALSE;
 379       break;
 380     default:
 381       /* everything else, skip dmarc */
 382       DEBUG(D_receive)
 383         debug_printf("DMARC skipping (%d), unsure what to do with %s",
 384                       libdm_status, from_header->text);
 385       has_dmarc_record = FALSE;
 386       break;
 387     }
 388
 389 /* Store the policy string in an expandable variable. */
 390
 391   libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 392   for (c = 0; dmarc_policy_description[c].name; c++)
 393     if (tmp_ans == dmarc_policy_description[c].value)
 394       {
 395       dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
 396       break;
 397       }
 398
 399   /* Can't use exim's string manipulation functions so allocate memory
 400    * for libopendmarc using its max hostname length definition. */
 401
 402   uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 403   libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
 404     dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
 405   dmarc_used_domain = string_copy(dmarc_domain);
 406   free(dmarc_domain);
 407
 408   if (libdm_status != DMARC_PARSE_OKAY)
 409     log_write(0, LOG_MAIN|LOG_PANIC,
 410       "failure to read domainname used for DMARC lookup: %s",
 411       opendmarc_policy_status_to_str(libdm_status));
 412
 413   libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 414   dmarc_policy = libdm_status;
 415   switch(libdm_status)
 416     {
 417     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 418       dmarc_status = US"norecord";
 419       dmarc_pass_fail = US"none";
 420       dmarc_status_text = US"No DMARC record";
 421       action = DMARC_RESULT_ACCEPT;
 422       break;
 423     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 424       dmarc_status = US"nofrom";
 425       dmarc_pass_fail = US"temperror";
 426       dmarc_status_text = US"No From: domain found";
 427       action = DMARC_RESULT_ACCEPT;
 428       break;
 429     case DMARC_POLICY_NONE:       /* Accept and report */
 430       dmarc_status = US"none";
 431       dmarc_pass_fail = US"none";
 432       dmarc_status_text = US"None, Accept";
 433       action = DMARC_RESULT_ACCEPT;
 434       break;
 435     case DMARC_POLICY_PASS:       /* Explicit accept */
 436       dmarc_status = US"accept";
 437       dmarc_pass_fail = US"pass";
 438       dmarc_status_text = US"Accept";
 439       action = DMARC_RESULT_ACCEPT;
 440       break;
 441     case DMARC_POLICY_REJECT:       /* Explicit reject */
 442       dmarc_status = US"reject";
 443       dmarc_pass_fail = US"fail";
 444       dmarc_status_text = US"Reject";
 445       action = DMARC_RESULT_REJECT;
 446       break;
 447     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 448       dmarc_status = US"quarantine";
 449       dmarc_pass_fail = US"fail";
 450       dmarc_status_text = US"Quarantine";
 451       action = DMARC_RESULT_QUARANTINE;
 452       break;
 453     default:
 454       dmarc_status = US"temperror";
 455       dmarc_pass_fail = US"temperror";
 456       dmarc_status_text = US"Internal Policy Error";
 457       action = DMARC_RESULT_TEMPFAIL;
 458       break;
 459     }
 460
 461   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 462   if (libdm_status != DMARC_PARSE_OKAY)
 463     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 464                              opendmarc_policy_status_to_str(libdm_status));
 465
 466   if (has_dmarc_record == TRUE)
 467     {
 468     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 469                            "spf_align=%s dkim_align=%s enforcement='%s'",
 470                            spf_sender_domain, dmarc_used_domain,
 471                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
 472                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
 473                            dmarc_status_text);
 474     history_file_status = dmarc_write_history_file();
 475     /* Now get the forensic reporting addresses, if any */
 476     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 477     dmarc_send_forensic_report(ruf);
 478     }
 479   }
 480
 481 /* set some global variables here */
 482 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 483
 484 /* shut down libopendmarc */
 485 if ( dmarc_pctx != NULL )
 486   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 487 if ( dmarc_disable_verify == FALSE )
 488   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 489
 490 return OK;
 491 }
 492
 493 int
 494 dmarc_write_history_file()
 495 {
 496 int history_file_fd;
 497 ssize_t written_len;
 498 int tmp_ans;
 499 u_char **rua; /* aggregate report addressees */
 500 uschar *history_buffer = NULL;
 501
 502 if (!dmarc_history_file)
 503   return DMARC_HIST_DISABLED;
 504 history_file_fd = log_create(dmarc_history_file);
 505
 506 if (history_file_fd < 0)
 507 {
 508   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 509                            dmarc_history_file);
 510   return DMARC_HIST_FILE_ERR;
 511 }
 512
 513 /* Generate the contents of the history file */
 514 history_buffer = string_sprintf(
 515   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 516   message_id, primary_hostname, time(NULL), sender_host_address,
 517   header_from_sender, expand_string(US"$sender_address_domain"));
 518
 519 if (spf_response)
 520   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 521   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 522
 523 history_buffer = string_sprintf(
 524   "%s%spdomain %s\npolicy %d\n",
 525   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 526
 527 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 528   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 529     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 530 else
 531   history_buffer = string_sprintf("%srua -\n", history_buffer);
 532
 533 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 534 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 535
 536 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 537 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 538
 539 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 540 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 541
 542 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 543 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 544
 545 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 546 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 547
 548 history_buffer = string_sprintf(
 549   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 550   history_buffer, da, sa, action);
 551
 552 /* Write the contents to the history file */
 553 DEBUG(D_receive)
 554   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 555              (host_checking || running_in_test_harness) ? " (not really)" : "");
 556 if (host_checking || running_in_test_harness)
 557   {
 558   DEBUG(D_receive)
 559     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 560   }
 561 else
 562   {
 563   written_len = write_to_fd_buf(history_file_fd,
 564                                 history_buffer,
 565                                 Ustrlen(history_buffer));
 566   if (written_len == 0)
 567     {
 568     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 569                            dmarc_history_file);
 570     return DMARC_HIST_WRITE_ERR;
 571     }
 572   (void)close(history_file_fd);
 573   }
 574 return DMARC_HIST_OK;
 575 }
 576
 577 uschar *
 578 dmarc_exim_expand_query(int what)
 579 {
 580 if (dmarc_disable_verify || !dmarc_pctx)
 581   return dmarc_exim_expand_defaults(what);
 582
 583 switch(what)
 584   {
 585   case DMARC_VERIFY_STATUS:
 586     return(dmarc_status);
 587   default:
 588     return US"";
 589   }
 590 }
 591
 592 uschar *
 593 dmarc_exim_expand_defaults(int what)
 594 {
 595 switch(what)
 596   {
 597   case DMARC_VERIFY_STATUS:
 598     return dmarc_disable_verify ?  US"off" : US"none";
 599   default:
 600     return US"";
 601   }
 602 }
 603
 604 uschar *
 605 dmarc_auth_results_header(header_line *from_header, uschar *hostname)
 606 {
 607 uschar *hdr_tmp    = US"";
 608
 609 /* Allow a server hostname to be passed to this function, but is
 610  * currently unused */
 611 if (!hostname)
 612   hostname = primary_hostname;
 613 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
 614
 615 #if 0
 616 /* I don't think this belongs here, but left it here commented out
 617  * because it was a lot of work to get working right. */
 618 if (spf_response != NULL) {
 619   uschar *dmarc_ar_spf = US"";
 620   int sr               = 0;
 621   sr = spf_response->result;
 622   dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL)  ? US"neutral" :
 623                  (sr == SPF_RESULT_PASS)     ? US"pass" :
 624                  (sr == SPF_RESULT_FAIL)     ? US"fail" :
 625                  (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
 626                  US"none";
 627   hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
 628                            hdr_tmp, dmarc_ar_spf_result,
 629                            spf_response->header_comment,
 630                            expand_string(US"$sender_address") );
 631 }
 632 #endif
 633
 634 hdr_tmp = string_sprintf("%s dmarc=%s", hdr_tmp, dmarc_pass_fail);
 635 if (header_from_sender)
 636   hdr_tmp = string_sprintf("%s header.from=%s",
 637                            hdr_tmp, header_from_sender);
 638 return hdr_tmp;
 639 }
 640
 641 # endif /* EXPERIMENTAL_SPF */
 642 #endif /* EXPERIMENTAL_DMARC */
 643 /* vi: aw ai sw=2
 644  */