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                  "/etc/exim/opendmarc.tlds" :
  87                  (char *)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_ar_header    = NULL;
  97 dmarc_has_been_checked = FALSE;
  98 header_from_sender = NULL;
  99 spf_sender_domain  = NULL;
 100 spf_human_readable = NULL;
 101
 102 /* ACLs have "control=dmarc_disable_verify" */
 103 if (dmarc_disable_verify == TRUE)
 104   return OK;
 105
 106 (void) memset(&dmarc_ctx, '\0', sizeof dmarc_ctx);
 107 dmarc_ctx.nscount = 0;
 108 libdm_status = opendmarc_policy_library_init(&dmarc_ctx);
 109 if (libdm_status != DMARC_PARSE_OKAY)
 110   {
 111   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to init library: %s",
 112                        opendmarc_policy_status_to_str(libdm_status));
 113   dmarc_abort = TRUE;
 114   }
 115 if (dmarc_tld_file == NULL)
 116   dmarc_abort = TRUE;
 117 else if (opendmarc_tld_read_file(tld_file, NULL, NULL, NULL))
 118   {
 119   log_write(0, LOG_MAIN|LOG_PANIC, "DMARC failure to load tld list %s: %d",
 120                        tld_file, errno);
 121   dmarc_abort = TRUE;
 122   }
 123 if (sender_host_address == NULL)
 124   dmarc_abort = TRUE;
 125 /* This catches locally originated email and startup errors above. */
 126 if (!dmarc_abort)
 127   {
 128   is_ipv6 = string_is_ip_address(sender_host_address, netmask) == 6;
 129   dmarc_pctx = opendmarc_policy_connect_init(sender_host_address, is_ipv6);
 130   if (dmarc_pctx == NULL)
 131     {
 132     log_write(0, LOG_MAIN|LOG_PANIC,
 133       "DMARC failure creating policy context: ip=%s", sender_host_address);
 134     dmarc_abort = TRUE;
 135     }
 136   }
 137
 138 return OK;
 139 }
 140
 141
 142 /* dmarc_store_data stores the header data so that subsequent
 143  * dmarc_process can access the data */
 144
 145 int dmarc_store_data(header_line *hdr) {
 146   /* No debug output because would change every test debug output */
 147   if (dmarc_disable_verify != TRUE)
 148     from_header = hdr;
 149   return OK;
 150 }
 151
 152
 153 static void
 154 dmarc_send_forensic_report(u_char **ruf)
 155 {
 156 int   c;
 157 uschar *recipient, *save_sender;
 158 BOOL  send_status = FALSE;
 159 error_block *eblock = NULL;
 160 FILE *message_file = NULL;
 161
 162 /* Earlier ACL does not have *required* control=dmarc_enable_forensic */
 163 if (!dmarc_enable_forensic)
 164   return;
 165
 166 if (  dmarc_policy == DMARC_POLICY_REJECT     && action == DMARC_RESULT_REJECT
 167    || dmarc_policy == DMARC_POLICY_QUARANTINE && action == DMARC_RESULT_QUARANTINE
 168    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_REJECT
 169    || dmarc_policy == DMARC_POLICY_NONE       && action == DMARC_RESULT_QUARANTINE
 170    )
 171   if (ruf)
 172     {
 173     eblock = add_to_eblock(eblock, US"Sender Domain", dmarc_used_domain);
 174     eblock = add_to_eblock(eblock, US"Sender IP Address", sender_host_address);
 175     eblock = add_to_eblock(eblock, US"Received Date", tod_stamp(tod_full));
 176     eblock = add_to_eblock(eblock, US"SPF Alignment",
 177                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?US"yes":US"no");
 178     eblock = add_to_eblock(eblock, US"DKIM Alignment",
 179                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?US"yes":US"no");
 180     eblock = add_to_eblock(eblock, US"DMARC Results", dmarc_status_text);
 181     /* Set a sane default envelope sender */
 182     dsn_from = dmarc_forensic_sender ? dmarc_forensic_sender :
 183                dsn_from ? dsn_from :
 184                string_sprintf("do-not-reply@%s",primary_hostname);
 185     for (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 || running_in_test_harness) ? " (not really)" : "");
 195       if (host_checking || running_in_test_harness)
 196         continue;
 197
 198       save_sender = sender_address;
 199       sender_address = recipient;
 200       send_status = moan_to_sender(ERRMESS_DMARC_FORENSIC, eblock,
 201                                    header_list, message_file, FALSE);
 202       sender_address = save_sender;
 203       if (!send_status)
 204         log_write(0, LOG_MAIN|LOG_PANIC,
 205           "failure to send DMARC forensic report to %s", recipient);
 206       }
 207     }
 208 }
 209
 210 /* dmarc_process adds the envelope sender address to the existing
 211    context (if any), retrieves the result, sets up expansion
 212    strings and evaluates the condition outcome. */
 213
 214 int
 215 dmarc_process()
 216 {
 217 int sr, origin;             /* used in SPF section */
 218 int dmarc_spf_result  = 0;  /* stores spf into dmarc conn ctx */
 219 int tmp_ans, c;
 220 pdkim_signature *sig  = NULL;
 221 BOOL has_dmarc_record = TRUE;
 222 u_char **ruf; /* forensic report addressees, if called for */
 223
 224 /* ACLs have "control=dmarc_disable_verify" */
 225 if (dmarc_disable_verify)
 226   {
 227   dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 228   return OK;
 229   }
 230
 231 /* Store the header From: sender domain for this part of DMARC.
 232  * If there is no from_header struct, then it's likely this message
 233  * is locally generated and relying on fixups to add it.  Just skip
 234  * the entire DMARC system if we can't find a From: header....or if
 235  * there was a previous error.
 236  */
 237 if (!from_header || dmarc_abort)
 238   dmarc_abort = TRUE;
 239 else
 240   {
 241     uschar * errormsg;
 242     int dummy, domain;
 243     uschar * p;
 244     uschar saveend;
 245
 246     parse_allow_group = TRUE;
 247     p = parse_find_address_end(from_header->text, FALSE);
 248     saveend = *p; *p = '\0';
 249     if ((header_from_sender = parse_extract_address(from_header->text, &errormsg,
 250                                 &dummy, &dummy, &domain, FALSE)))
 251       header_from_sender += domain;
 252     *p = saveend;
 253
 254     /* The opendmarc library extracts the domain from the email address, but
 255      * only try to store it if it's not empty.  Otherwise, skip out of DMARC. */
 256     if (!header_from_sender || (strcmp( CCS header_from_sender, "") == 0))
 257       dmarc_abort = TRUE;
 258     libdm_status = dmarc_abort ?
 259       DMARC_PARSE_OKAY :
 260       opendmarc_policy_store_from_domain(dmarc_pctx, header_from_sender);
 261     if (libdm_status != DMARC_PARSE_OKAY)
 262     {
 263     log_write(0, LOG_MAIN|LOG_PANIC,
 264               "failure to store header From: in DMARC: %s, header was '%s'",
 265               opendmarc_policy_status_to_str(libdm_status), from_header->text);
 266     dmarc_abort = TRUE;
 267     }
 268   }
 269
 270 /* Skip DMARC if connection is SMTP Auth. Temporarily, admin should
 271  * instead do this in the ACLs.  */
 272 if (!dmarc_abort && !sender_host_authenticated)
 273   {
 274   /* Use the envelope sender domain for this part of DMARC */
 275   spf_sender_domain = expand_string(US"$sender_address_domain");
 276   if (!spf_response)
 277     {
 278     /* No spf data means null envelope sender so generate a domain name
 279      * from the sender_helo_name  */
 280     if (!spf_sender_domain)
 281       {
 282       spf_sender_domain = sender_helo_name;
 283       log_write(0, LOG_MAIN, "DMARC using synthesized SPF sender domain = %s\n",
 284                              spf_sender_domain);
 285       DEBUG(D_receive)
 286         debug_printf("DMARC using synthesized SPF sender domain = %s\n",
 287           spf_sender_domain);
 288       }
 289     dmarc_spf_result = DMARC_POLICY_SPF_OUTCOME_NONE;
 290     dmarc_spf_ares_result = ARES_RESULT_UNKNOWN;
 291     origin = DMARC_POLICY_SPF_ORIGIN_HELO;
 292     spf_human_readable = US"";
 293     }
 294   else
 295     {
 296     sr = spf_response->result;
 297     dmarc_spf_result = sr == SPF_RESULT_NEUTRAL  ? DMARC_POLICY_SPF_OUTCOME_NONE :
 298                        sr == SPF_RESULT_PASS     ? DMARC_POLICY_SPF_OUTCOME_PASS :
 299                        sr == SPF_RESULT_FAIL     ? DMARC_POLICY_SPF_OUTCOME_FAIL :
 300                        sr == SPF_RESULT_SOFTFAIL ? DMARC_POLICY_SPF_OUTCOME_TMPFAIL :
 301                        DMARC_POLICY_SPF_OUTCOME_NONE;
 302     dmarc_spf_ares_result = sr == SPF_RESULT_NEUTRAL   ? ARES_RESULT_NEUTRAL :
 303                             sr == SPF_RESULT_PASS      ? ARES_RESULT_PASS :
 304                             sr == SPF_RESULT_FAIL      ? ARES_RESULT_FAIL :
 305                             sr == SPF_RESULT_SOFTFAIL  ? ARES_RESULT_SOFTFAIL :
 306                             sr == SPF_RESULT_NONE      ? ARES_RESULT_NONE :
 307                             sr == SPF_RESULT_TEMPERROR ? ARES_RESULT_TEMPERROR :
 308                             sr == SPF_RESULT_PERMERROR ? ARES_RESULT_PERMERROR :
 309                             ARES_RESULT_UNKNOWN;
 310     origin = DMARC_POLICY_SPF_ORIGIN_MAILFROM;
 311     spf_human_readable = (uschar *)spf_response->header_comment;
 312     DEBUG(D_receive)
 313       debug_printf("DMARC using SPF sender domain = %s\n", spf_sender_domain);
 314     }
 315   if (strcmp( CCS spf_sender_domain, "") == 0)
 316     dmarc_abort = TRUE;
 317   if (!dmarc_abort)
 318     {
 319     libdm_status = opendmarc_policy_store_spf(dmarc_pctx, spf_sender_domain,
 320                                 dmarc_spf_result, origin, spf_human_readable);
 321     if (libdm_status != DMARC_PARSE_OKAY)
 322       log_write(0, LOG_MAIN|LOG_PANIC, "failure to store spf for DMARC: %s",
 323                            opendmarc_policy_status_to_str(libdm_status));
 324     }
 325
 326   /* Now we cycle through the dkim signature results and put into
 327    * the opendmarc context, further building the DMARC reply.  */
 328   sig = dkim_signatures;
 329   dkim_history_buffer = US"";
 330   while (sig)
 331     {
 332     int dkim_result, dkim_ares_result, vs, ves;
 333     vs  = sig->verify_status;
 334     ves = sig->verify_ext_status;
 335     dkim_result = vs == PDKIM_VERIFY_PASS ? DMARC_POLICY_DKIM_OUTCOME_PASS :
 336                   vs == PDKIM_VERIFY_FAIL ? DMARC_POLICY_DKIM_OUTCOME_FAIL :
 337                   vs == PDKIM_VERIFY_INVALID ? DMARC_POLICY_DKIM_OUTCOME_TMPFAIL :
 338                   DMARC_POLICY_DKIM_OUTCOME_NONE;
 339     libdm_status = opendmarc_policy_store_dkim(dmarc_pctx, (uschar *)sig->domain,
 340                                                dkim_result, US"");
 341     DEBUG(D_receive)
 342       debug_printf("DMARC adding DKIM sender domain = %s\n", sig->domain);
 343     if (libdm_status != DMARC_PARSE_OKAY)
 344       log_write(0, LOG_MAIN|LOG_PANIC,
 345                 "failure to store dkim (%s) for DMARC: %s",
 346                 sig->domain, opendmarc_policy_status_to_str(libdm_status));
 347
 348     dkim_ares_result =
 349       vs == PDKIM_VERIFY_PASS    ? ARES_RESULT_PASS :
 350       vs == PDKIM_VERIFY_FAIL    ? ARES_RESULT_FAIL :
 351       vs == PDKIM_VERIFY_NONE    ? ARES_RESULT_NONE :
 352       vs == PDKIM_VERIFY_INVALID ?
 353        ves == PDKIM_VERIFY_INVALID_PUBKEY_UNAVAILABLE ? ARES_RESULT_PERMERROR :
 354        ves == PDKIM_VERIFY_INVALID_BUFFER_SIZE        ? ARES_RESULT_PERMERROR :
 355        ves == PDKIM_VERIFY_INVALID_PUBKEY_DNSRECORD   ? ARES_RESULT_PERMERROR :
 356        ves == PDKIM_VERIFY_INVALID_PUBKEY_IMPORT      ? ARES_RESULT_PERMERROR :
 357        ARES_RESULT_UNKNOWN :
 358       ARES_RESULT_UNKNOWN;
 359     dkim_history_buffer = string_sprintf("%sdkim %s %d\n", dkim_history_buffer,
 360                                          sig->domain, dkim_ares_result);
 361     sig = sig->next;
 362     }
 363   libdm_status = opendmarc_policy_query_dmarc(dmarc_pctx, US"");
 364   switch (libdm_status)
 365     {
 366     case DMARC_DNS_ERROR_NXDOMAIN:
 367     case DMARC_DNS_ERROR_NO_RECORD:
 368       DEBUG(D_receive)
 369         debug_printf("DMARC no record found for %s\n", header_from_sender);
 370       has_dmarc_record = FALSE;
 371       break;
 372     case DMARC_PARSE_OKAY:
 373       DEBUG(D_receive)
 374         debug_printf("DMARC record found for %s\n", header_from_sender);
 375       break;
 376     case DMARC_PARSE_ERROR_BAD_VALUE:
 377       DEBUG(D_receive)
 378         debug_printf("DMARC record parse error for %s\n", header_from_sender);
 379       has_dmarc_record = FALSE;
 380       break;
 381     default:
 382       /* everything else, skip dmarc */
 383       DEBUG(D_receive)
 384         debug_printf("DMARC skipping (%d), unsure what to do with %s",
 385                       libdm_status, from_header->text);
 386       has_dmarc_record = FALSE;
 387       break;
 388     }
 389
 390 /* Store the policy string in an expandable variable. */
 391
 392   libdm_status = opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 393   for (c = 0; dmarc_policy_description[c].name; c++)
 394     if (tmp_ans == dmarc_policy_description[c].value)
 395       {
 396       dmarc_domain_policy = string_sprintf("%s",dmarc_policy_description[c].name);
 397       break;
 398       }
 399
 400   /* Can't use exim's string manipulation functions so allocate memory
 401    * for libopendmarc using its max hostname length definition. */
 402
 403   uschar *dmarc_domain = (uschar *)calloc(DMARC_MAXHOSTNAMELEN, sizeof(uschar));
 404   libdm_status = opendmarc_policy_fetch_utilized_domain(dmarc_pctx,
 405     dmarc_domain, DMARC_MAXHOSTNAMELEN-1);
 406   dmarc_used_domain = string_copy(dmarc_domain);
 407   free(dmarc_domain);
 408
 409   if (libdm_status != DMARC_PARSE_OKAY)
 410     log_write(0, LOG_MAIN|LOG_PANIC,
 411       "failure to read domainname used for DMARC lookup: %s",
 412       opendmarc_policy_status_to_str(libdm_status));
 413
 414   libdm_status = opendmarc_get_policy_to_enforce(dmarc_pctx);
 415   dmarc_policy = libdm_status;
 416   switch(libdm_status)
 417     {
 418     case DMARC_POLICY_ABSENT:     /* No DMARC record found */
 419       dmarc_status = US"norecord";
 420       dmarc_pass_fail = US"none";
 421       dmarc_status_text = US"No DMARC record";
 422       action = DMARC_RESULT_ACCEPT;
 423       break;
 424     case DMARC_FROM_DOMAIN_ABSENT:    /* No From: domain */
 425       dmarc_status = US"nofrom";
 426       dmarc_pass_fail = US"temperror";
 427       dmarc_status_text = US"No From: domain found";
 428       action = DMARC_RESULT_ACCEPT;
 429       break;
 430     case DMARC_POLICY_NONE:       /* Accept and report */
 431       dmarc_status = US"none";
 432       dmarc_pass_fail = US"none";
 433       dmarc_status_text = US"None, Accept";
 434       action = DMARC_RESULT_ACCEPT;
 435       break;
 436     case DMARC_POLICY_PASS:       /* Explicit accept */
 437       dmarc_status = US"accept";
 438       dmarc_pass_fail = US"pass";
 439       dmarc_status_text = US"Accept";
 440       action = DMARC_RESULT_ACCEPT;
 441       break;
 442     case DMARC_POLICY_REJECT:       /* Explicit reject */
 443       dmarc_status = US"reject";
 444       dmarc_pass_fail = US"fail";
 445       dmarc_status_text = US"Reject";
 446       action = DMARC_RESULT_REJECT;
 447       break;
 448     case DMARC_POLICY_QUARANTINE:       /* Explicit quarantine */
 449       dmarc_status = US"quarantine";
 450       dmarc_pass_fail = US"fail";
 451       dmarc_status_text = US"Quarantine";
 452       action = DMARC_RESULT_QUARANTINE;
 453       break;
 454     default:
 455       dmarc_status = US"temperror";
 456       dmarc_pass_fail = US"temperror";
 457       dmarc_status_text = US"Internal Policy Error";
 458       action = DMARC_RESULT_TEMPFAIL;
 459       break;
 460     }
 461
 462   libdm_status = opendmarc_policy_fetch_alignment(dmarc_pctx, &da, &sa);
 463   if (libdm_status != DMARC_PARSE_OKAY)
 464     log_write(0, LOG_MAIN|LOG_PANIC, "failure to read DMARC alignment: %s",
 465                              opendmarc_policy_status_to_str(libdm_status));
 466
 467   if (has_dmarc_record == TRUE)
 468     {
 469     log_write(0, LOG_MAIN, "DMARC results: spf_domain=%s dmarc_domain=%s "
 470                            "spf_align=%s dkim_align=%s enforcement='%s'",
 471                            spf_sender_domain, dmarc_used_domain,
 472                            (sa==DMARC_POLICY_SPF_ALIGNMENT_PASS) ?"yes":"no",
 473                            (da==DMARC_POLICY_DKIM_ALIGNMENT_PASS)?"yes":"no",
 474                            dmarc_status_text);
 475     history_file_status = dmarc_write_history_file();
 476     /* Now get the forensic reporting addresses, if any */
 477     ruf = opendmarc_policy_fetch_ruf(dmarc_pctx, NULL, 0, 1);
 478     dmarc_send_forensic_report(ruf);
 479     }
 480   }
 481
 482 /* set some global variables here */
 483 dmarc_ar_header = dmarc_auth_results_header(from_header, NULL);
 484
 485 /* shut down libopendmarc */
 486 if ( dmarc_pctx != NULL )
 487   (void) opendmarc_policy_connect_shutdown(dmarc_pctx);
 488 if ( dmarc_disable_verify == FALSE )
 489   (void) opendmarc_policy_library_shutdown(&dmarc_ctx);
 490
 491 return OK;
 492 }
 493
 494 int
 495 dmarc_write_history_file()
 496 {
 497 int history_file_fd;
 498 ssize_t written_len;
 499 int tmp_ans;
 500 u_char **rua; /* aggregate report addressees */
 501 uschar *history_buffer = NULL;
 502
 503 if (!dmarc_history_file)
 504   return DMARC_HIST_DISABLED;
 505 history_file_fd = log_create(dmarc_history_file);
 506
 507 if (history_file_fd < 0)
 508 {
 509   log_write(0, LOG_MAIN|LOG_PANIC, "failure to create DMARC history file: %s",
 510                            dmarc_history_file);
 511   return DMARC_HIST_FILE_ERR;
 512 }
 513
 514 /* Generate the contents of the history file */
 515 history_buffer = string_sprintf(
 516   "job %s\nreporter %s\nreceived %ld\nipaddr %s\nfrom %s\nmfrom %s\n",
 517   message_id, primary_hostname, time(NULL), sender_host_address,
 518   header_from_sender, expand_string(US"$sender_address_domain"));
 519
 520 if (spf_response)
 521   history_buffer = string_sprintf("%sspf %d\n", history_buffer, dmarc_spf_ares_result);
 522   /* history_buffer = string_sprintf("%sspf -1\n", history_buffer); */
 523
 524 history_buffer = string_sprintf(
 525   "%s%spdomain %s\npolicy %d\n",
 526   history_buffer, dkim_history_buffer, dmarc_used_domain, dmarc_policy);
 527
 528 if ((rua = opendmarc_policy_fetch_rua(dmarc_pctx, NULL, 0, 1)))
 529   for (tmp_ans = 0; rua[tmp_ans]; tmp_ans++)
 530     history_buffer = string_sprintf("%srua %s\n", history_buffer, rua[tmp_ans]);
 531 else
 532   history_buffer = string_sprintf("%srua -\n", history_buffer);
 533
 534 opendmarc_policy_fetch_pct(dmarc_pctx, &tmp_ans);
 535 history_buffer = string_sprintf("%spct %d\n", history_buffer, tmp_ans);
 536
 537 opendmarc_policy_fetch_adkim(dmarc_pctx, &tmp_ans);
 538 history_buffer = string_sprintf("%sadkim %d\n", history_buffer, tmp_ans);
 539
 540 opendmarc_policy_fetch_aspf(dmarc_pctx, &tmp_ans);
 541 history_buffer = string_sprintf("%saspf %d\n", history_buffer, tmp_ans);
 542
 543 opendmarc_policy_fetch_p(dmarc_pctx, &tmp_ans);
 544 history_buffer = string_sprintf("%sp %d\n", history_buffer, tmp_ans);
 545
 546 opendmarc_policy_fetch_sp(dmarc_pctx, &tmp_ans);
 547 history_buffer = string_sprintf("%ssp %d\n", history_buffer, tmp_ans);
 548
 549 history_buffer = string_sprintf(
 550   "%salign_dkim %d\nalign_spf %d\naction %d\n",
 551   history_buffer, da, sa, action);
 552
 553 /* Write the contents to the history file */
 554 DEBUG(D_receive)
 555   debug_printf("DMARC logging history data for opendmarc reporting%s\n",
 556              (host_checking || running_in_test_harness) ? " (not really)" : "");
 557 if (host_checking || running_in_test_harness)
 558   {
 559   DEBUG(D_receive)
 560     debug_printf("DMARC history data for debugging:\n%s", history_buffer);
 561   }
 562 else
 563   {
 564   written_len = write_to_fd_buf(history_file_fd,
 565                                 history_buffer,
 566                                 Ustrlen(history_buffer));
 567   if (written_len == 0)
 568     {
 569     log_write(0, LOG_MAIN|LOG_PANIC, "failure to write to DMARC history file: %s",
 570                            dmarc_history_file);
 571     return DMARC_HIST_WRITE_ERR;
 572     }
 573   (void)close(history_file_fd);
 574   }
 575 return DMARC_HIST_OK;
 576 }
 577
 578 uschar *
 579 dmarc_exim_expand_query(int what)
 580 {
 581 if (dmarc_disable_verify || !dmarc_pctx)
 582   return dmarc_exim_expand_defaults(what);
 583
 584 switch(what)
 585   {
 586   case DMARC_VERIFY_STATUS:
 587     return(dmarc_status);
 588   default:
 589     return US"";
 590   }
 591 }
 592
 593 uschar *
 594 dmarc_exim_expand_defaults(int what)
 595 {
 596 switch(what)
 597   {
 598   case DMARC_VERIFY_STATUS:
 599     return dmarc_disable_verify ?  US"off" : US"none";
 600   default:
 601     return US"";
 602   }
 603 }
 604
 605 uschar *
 606 dmarc_auth_results_header(header_line *from_header, uschar *hostname)
 607 {
 608 uschar *hdr_tmp    = US"";
 609
 610 /* Allow a server hostname to be passed to this function, but is
 611  * currently unused */
 612 if (!hostname)
 613   hostname = primary_hostname;
 614 hdr_tmp = string_sprintf("%s %s;", DMARC_AR_HEADER, hostname);
 615
 616 #if 0
 617 /* I don't think this belongs here, but left it here commented out
 618  * because it was a lot of work to get working right. */
 619 if (spf_response != NULL) {
 620   uschar *dmarc_ar_spf = US"";
 621   int sr               = 0;
 622   sr = spf_response->result;
 623   dmarc_ar_spf = (sr == SPF_RESULT_NEUTRAL)  ? US"neutral" :
 624                  (sr == SPF_RESULT_PASS)     ? US"pass" :
 625                  (sr == SPF_RESULT_FAIL)     ? US"fail" :
 626                  (sr == SPF_RESULT_SOFTFAIL) ? US"softfail" :
 627                  US"none";
 628   hdr_tmp = string_sprintf("%s spf=%s (%s) smtp.mail=%s;",
 629                            hdr_tmp, dmarc_ar_spf_result,
 630                            spf_response->header_comment,
 631                            expand_string(US"$sender_address") );
 632 }
 633 #endif
 634
 635 hdr_tmp = string_sprintf("%s dmarc=%s", hdr_tmp, dmarc_pass_fail);
 636 if (header_from_sender)
 637   hdr_tmp = string_sprintf("%s header.from=%s",
 638                            hdr_tmp, header_from_sender);
 639 return hdr_tmp;
 640 }
 641
 642 # endif /* EXPERIMENTAL_SPF */
 643 #endif /* EXPERIMENTAL_DMARC */
 644 /* vi: aw ai sw=2
 645  */