50 #if HAVE_KRB5_MEMORY_KEYTAB
51 typedef struct _krb5_kt_list {
52 struct _krb5_kt_list *next;
53 krb5_keytab_entry *entry;
55 krb5_kt_list ktlist =
nullptr;
57 krb5_keytab memory_keytab;
59 krb5_error_code krb5_free_kt_list(krb5_context context, krb5_kt_list kt_list);
60 krb5_error_code krb5_write_keytab(krb5_context context,
63 krb5_error_code krb5_read_keytab(krb5_context context,
65 krb5_kt_list *kt_list);
69 check_k5_err(krb5_context context,
const char *
function, krb5_error_code code)
72 if (code && code != KRB5_KT_END) {
74 errmsg = krb5_get_error_message(context, code);
76 fprintf(stderr,
"%s| %s: ERROR: %s: %s\n",
LogTime(),
PROGRAM,
function, errmsg);
77 #if HAVE_KRB5_FREE_ERROR_MESSAGE
78 krb5_free_error_message(context, errmsg);
79 #elif HAVE_KRB5_FREE_ERROR_STRING
80 krb5_free_error_string(context, (
char *)errmsg);
95 struct addrinfo *hres =
nullptr, *hres_list;
100 debug((
char *)
"%s| %s: ERROR: resolving hostname '%s' failed\n",
LogTime(),
PROGRAM, hostname);
101 fprintf(stderr,
"%s| %s: ERROR: resolving hostname '%s' failed\n",
105 rc = getaddrinfo(hostname,
nullptr,
nullptr, &hres);
106 if (rc != 0 || hres ==
nullptr ) {
107 debug((
char *)
"%s| %s: ERROR: resolving hostname with getaddrinfo: %s failed\n",
110 "%s| %s: ERROR: resolving hostname with getaddrinfo: %s failed\n",
116 hres_list = hres_list->ai_next;
118 rc = getnameinfo(hres->ai_addr, hres->ai_addrlen, hostname,
119 sizeof(hostname),
nullptr, 0, 0);
121 debug((
char *)
"%s| %s: ERROR: resolving ip address with getnameinfo: %s failed\n",
124 "%s| %s: ERROR: resolving ip address with getnameinfo: %s failed\n",
130 hostname[
sizeof(hostname)-1] =
'\0';
135 check_gss_err(OM_uint32 major_status, OM_uint32 minor_status,
136 const char *
function,
int log,
int sout)
138 if (GSS_ERROR(major_status)) {
139 OM_uint32 maj_stat, min_stat;
140 OM_uint32 msg_ctx = 0;
141 gss_buffer_desc status_string;
149 maj_stat = gss_display_status(&min_stat, major_status,
150 GSS_C_GSS_CODE, GSS_C_NULL_OID, &msg_ctx, &status_string);
151 if (maj_stat == GSS_S_COMPLETE && status_string.length > 0) {
152 if (
sizeof(buf) > len + status_string.length + 1) {
153 snprintf(buf + len, (
sizeof(buf) - len),
"%s", (
char *) status_string.value);
154 len += status_string.length;
158 gss_release_buffer(&min_stat, &status_string);
160 if (
sizeof(buf) > len + 2) {
161 snprintf(buf + len, (
sizeof(buf) - len),
"%s",
". ");
167 maj_stat = gss_display_status(&min_stat, minor_status,
168 GSS_C_MECH_CODE, GSS_C_NULL_OID, &msg_ctx, &status_string);
169 if (maj_stat == GSS_S_COMPLETE && status_string.length > 0) {
170 if (
sizeof(buf) > len + status_string.length) {
171 snprintf(buf + len, (
sizeof(buf) - len),
"%s", (
char *) status_string.value);
172 len += status_string.length;
176 gss_release_buffer(&min_stat, &status_string);
180 fprintf(stdout,
"BH %s failed: %s\n",
function, buf);
182 fprintf(stderr,
"%s| %s: INFO: User not authenticated\n",
LogTime(),
189 #if HAVE_KRB5_MEMORY_KEYTAB
193 krb5_error_code krb5_free_kt_list(krb5_context context, krb5_kt_list list)
195 krb5_kt_list lp = list;
198 #if HAVE_LIBHEIMDAL_KRB5 || ( HAVE_KRB5_KT_FREE_ENTRY && HAVE_DECL_KRB5_KT_FREE_ENTRY )
199 krb5_error_code retval = krb5_kt_free_entry(context, lp->entry);
201 krb5_error_code retval = krb5_free_keytab_entry_contents(context, lp->entry);
204 if (
check_k5_err(context,
"krb5_kt_free_entry", retval))
206 krb5_kt_list prev = lp;
216 krb5_error_code krb5_read_keytab(krb5_context context,
char *name, krb5_kt_list *list)
218 krb5_kt_list lp =
nullptr, tail =
nullptr, back =
nullptr;
220 krb5_keytab_entry *entry;
221 krb5_kt_cursor cursor;
222 krb5_error_code retval = 0;
226 for (lp = *list; lp->next; lp = lp->next);
229 retval = krb5_kt_resolve(context, name, &kt);
232 retval = krb5_kt_start_seq_get(context, kt, &cursor);
233 if (
check_k5_err(context,
"krb5_kt_start_seq_get", retval))
236 entry = (krb5_keytab_entry *)
xcalloc(1,
sizeof (krb5_keytab_entry));
239 debug((
char *)
"%s| %s: ERROR: krb5_read_keytab failed: %s\n",
241 fprintf(stderr,
"%s| %s: ERROR: krb5_read_keytab: %s\n",
245 memset(entry, 0,
sizeof (*entry));
246 retval = krb5_kt_next_entry(context, kt, entry, &cursor);
247 if (
check_k5_err(context,
"krb5_kt_next_entry", retval))
251 lp = (krb5_kt_list)
xmalloc(
sizeof (*lp));
254 debug((
char *)
"%s| %s: ERROR: krb5_read_keytab failed: %s\n",
256 fprintf(stderr,
"%s| %s: ERROR: krb5_read_keytab: %s\n",
261 lp->next = (krb5_kt_list)
xmalloc(
sizeof (*lp));
264 debug((
char *)
"%s| %s: ERROR: krb5_read_keytab failed: %s\n",
266 fprintf(stderr,
"%s| %s: ERROR: krb5_read_keytab: %s\n",
279 if (retval == KRB5_KT_END)
282 krb5_free_kt_list(context, tail);
285 back->next =
nullptr;
290 krb5_kt_end_seq_get(context, kt, &cursor);
292 krb5_kt_close(context, kt);
299 krb5_error_code krb5_write_keytab(krb5_context context, krb5_kt_list list,
char *name)
302 krb5_error_code retval = 0;
304 snprintf(ktname,
sizeof(ktname),
"%s", name);
305 retval = krb5_kt_resolve(context, ktname, &memory_keytab);
308 for (krb5_kt_list lp = list; lp; lp = lp->next) {
309 retval = krb5_kt_add_entry(context, memory_keytab, lp->entry);
321 main(
int argc,
char *
const argv[])
325 char *user =
nullptr;
326 char *rfc_user =
nullptr;
328 char ad_groups[MAX_PAC_GROUP_SIZE];
331 #if HAVE_LIBHEIMDAL_KRB5
332 gss_buffer_desc data_set = GSS_C_EMPTY_BUFFER;
334 gss_buffer_desc type_id = GSS_C_EMPTY_BUFFER;
337 krb5_context context =
nullptr;
341 int opt,
log = 0, norealm = 0;
342 OM_uint32 ret_flags = 0, spnego_flag = 0;
343 char *
service_name = (
char *)
"HTTP", *host_name =
nullptr;
344 char *token =
nullptr;
345 char *service_principal =
nullptr;
346 char *keytab_name =
nullptr;
347 char *keytab_name_env =
nullptr;
349 #if HAVE_KRB5_MEMORY_KEYTAB
350 char *memory_keytab_name =
nullptr;
351 char *memory_keytab_name_env =
nullptr;
353 char *rcache_type =
nullptr;
354 char *rcache_type_env =
nullptr;
355 char *rcache_dir =
nullptr;
356 char *rcache_dir_env =
nullptr;
357 OM_uint32 major_status, minor_status;
358 gss_ctx_id_t gss_context = GSS_C_NO_CONTEXT;
359 gss_name_t client_name = GSS_C_NO_NAME;
360 gss_name_t server_name = GSS_C_NO_NAME;
361 gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
362 gss_buffer_desc service = GSS_C_EMPTY_BUFFER;
363 gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
364 gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
365 const unsigned char *kerberosToken =
nullptr;
366 const unsigned char *spnegoToken =
nullptr;
367 size_t spnegoTokenLength = 0;
369 setbuf(stdout,
nullptr);
370 setbuf(stdin,
nullptr);
372 while (-1 != (opt =
getopt(argc, argv,
"dirs:k:c:t:"))) {
391 fprintf(stderr,
"ERROR: keytab file not given\n");
398 if ((ktp=strchr(keytab_name,
':')))
402 if (stat((
const char*)ktp, &fstat)) {
404 fprintf(stderr,
"ERROR: keytab file %s does not exist\n",keytab_name);
406 fprintf(stderr,
"ERROR: Error %s during stat of keytab file %s\n",
strerror(errno),keytab_name);
408 }
else if (!S_ISREG(fstat.st_mode)) {
409 fprintf(stderr,
"ERROR: keytab file %s is not a file\n",keytab_name);
414 if (access(ktp, R_OK)) {
415 fprintf(stderr,
"ERROR: keytab file %s is not accessible\n",keytab_name);
427 fprintf(stderr,
"ERROR: replay cache directory not given\n");
434 if (stat((
const char*)rcache_dir, &dstat)) {
436 fprintf(stderr,
"ERROR: replay cache directory %s does not exist\n",rcache_dir);
438 fprintf(stderr,
"ERROR: Error %s during stat of replay cache directory %s\n",
strerror(errno),rcache_dir);
440 }
else if (!S_ISDIR(dstat.st_mode)) {
441 fprintf(stderr,
"ERROR: replay cache directory %s is not a directory\n",rcache_dir);
446 if (access(rcache_dir, W_OK)) {
447 fprintf(stderr,
"ERROR: replay cache directory %s is not accessible\n",rcache_dir);
456 fprintf(stderr,
"ERROR: replay cache type not given\n");
464 fprintf(stderr,
"ERROR: service principal not given\n");
469 fprintf(stderr,
"Usage: \n");
470 fprintf(stderr,
"squid_kerb_auth [-d] [-i] [-s SPN] [-k keytab] [-c rcdir] [-t rctype]\n");
471 fprintf(stderr,
"-d full debug\n");
472 fprintf(stderr,
"-i informational messages\n");
473 fprintf(stderr,
"-r remove realm from username\n");
474 fprintf(stderr,
"-s service principal name\n");
475 fprintf(stderr,
"-k keytab name\n");
476 fprintf(stderr,
"-c replay cache directory\n");
477 fprintf(stderr,
"-t replay cache type\n");
479 "The SPN can be set to GSS_C_NO_NAME to allow any entry from keytab\n");
480 fprintf(stderr,
"default SPN is HTTP/fqdn@DEFAULT_REALM\n");
486 if (service_principal && strcasecmp(service_principal,
"GSS_C_NO_NAME")) {
487 if (!strstr(service_principal,
"HTTP/")) {
488 debug((
char *)
"%s| %s: WARN: service_principal %s does not start with HTTP/\n",
491 service.value = service_principal;
492 service.length = strlen((
char *) service.value);
497 "%s| %s: FATAL: Local hostname could not be determined. Please specify the service principal\n",
499 fprintf(stdout,
"BH hostname error\n");
503 snprintf((
char *) service.value, strlen(
service_name) + strlen(host_name) + 2,
505 service.length = strlen((
char *) service.value);
510 rcache_type_env = (
char *)
xmalloc(strlen(
"KRB5RCACHETYPE=")+strlen(rcache_type)+1);
511 strcpy(rcache_type_env,
"KRB5RCACHETYPE=");
512 strcat(rcache_type_env, rcache_type);
513 putenv(rcache_type_env);
514 debug((
char *)
"%s| %s: INFO: Setting replay cache type to %s\n",
519 rcache_dir_env = (
char *)
xmalloc(strlen(
"KRB5RCACHEDIR=")+strlen(rcache_dir)+1);
520 strcpy(rcache_dir_env,
"KRB5RCACHEDIR=");
521 strcat(rcache_dir_env, rcache_dir);
522 putenv(rcache_dir_env);
523 debug((
char *)
"%s| %s: INFO: Setting replay cache directory to %s\n",
528 keytab_name_env = (
char *)
xmalloc(strlen(
"KRB5_KTNAME=")+strlen(keytab_name)+1);
529 strcpy(keytab_name_env,
"KRB5_KTNAME=");
530 strcat(keytab_name_env, keytab_name);
531 putenv(keytab_name_env);
533 keytab_name_env = getenv(
"KRB5_KTNAME");
534 if (!keytab_name_env) {
535 ret = krb5_init_context(&context);
537 krb5_kt_default_name(context, default_keytab,
MAXPATHLEN);
539 keytab_name =
xstrdup(default_keytab);
540 krb5_free_context(context);
542 keytab_name =
xstrdup(keytab_name_env);
545 #if HAVE_KRB5_MEMORY_KEYTAB
546 ret = krb5_init_context(&context);
548 memory_keytab_name = (
char *)
xmalloc(strlen(
"MEMORY:negotiate_kerberos_auth_")+16);
549 snprintf(memory_keytab_name, strlen(
"MEMORY:negotiate_kerberos_auth_")+16,
550 "MEMORY:negotiate_kerberos_auth_%d", (
unsigned int) getpid());
551 ret = krb5_read_keytab(context, keytab_name, &ktlist);
553 debug((
char *)
"%s| %s: ERROR: Reading keytab %s into list failed\n",
556 ret = krb5_write_keytab(context, ktlist, memory_keytab_name);
558 debug((
char *)
"%s| %s: ERROR: Writing list into keytab %s\n",
561 memory_keytab_name_env = (
char *)
xmalloc(strlen(
"KRB5_KTNAME=")+strlen(memory_keytab_name)+1);
562 strcpy(memory_keytab_name_env,
"KRB5_KTNAME=");
563 strcat(memory_keytab_name_env, memory_keytab_name);
564 putenv(memory_keytab_name_env);
566 keytab_name =
xstrdup(memory_keytab_name);
567 debug((
char *)
"%s| %s: INFO: Changed keytab to %s\n",
571 ret = krb5_free_kt_list(context,ktlist);
573 debug((
char *)
"%s| %s: ERROR: Freeing list failed\n",
577 krb5_free_context(context);
579 #ifdef HAVE_HEIMDAL_KERBEROS
580 gsskrb5_register_acceptor_identity(keytab_name);
583 if (fgets(buf,
sizeof(buf) - 1, stdin) ==
nullptr) {
585 debug((
char *)
"%s| %s: FATAL: fgets() failed! dying..... errno=%d (%s)\n",
589 fprintf(stdout,
"BH input error\n");
592 fprintf(stdout,
"BH input error\n");
595 c = (
char *) memchr(buf,
'\n',
sizeof(buf) - 1);
604 fprintf(stdout,
"BH Oversized message\n");
608 debug((
char *)
"%s| %s: DEBUG: Got '%s' from squid (length: %ld).\n",
LogTime(),
PROGRAM, buf, length);
610 if (buf[0] ==
'\0') {
612 fprintf(stdout,
"BH Invalid request\n");
615 if (strlen(buf) < 2) {
617 fprintf(stdout,
"BH Invalid request\n");
620 if (!strncmp(buf,
"QQ", 2)) {
621 gss_release_buffer(&minor_status, &input_token);
622 gss_release_buffer(&minor_status, &output_token);
623 gss_release_buffer(&minor_status, &service);
624 gss_release_cred(&minor_status, &server_creds);
626 gss_release_name(&minor_status, &server_name);
628 gss_release_name(&minor_status, &client_name);
629 if (gss_context != GSS_C_NO_CONTEXT)
630 gss_delete_sec_context(&minor_status, &gss_context,
nullptr);
634 xfree(kerberosToken);
642 xfree(rcache_type_env);
644 xfree(rcache_dir_env);
646 xfree(keytab_name_env);
647 #if HAVE_KRB5_MEMORY_KEYTAB
648 krb5_kt_close(context, memory_keytab);
649 xfree(memory_keytab_name);
650 xfree(memory_keytab_name_env);
653 fprintf(stdout,
"BH quit command\n");
656 if (strncmp(buf,
"YR", 2) && strncmp(buf,
"KK", 2)) {
658 fprintf(stdout,
"BH Invalid request\n");
661 if (!strncmp(buf,
"YR", 2)) {
662 if (gss_context != GSS_C_NO_CONTEXT)
663 gss_delete_sec_context(&minor_status, &gss_context,
nullptr);
664 gss_context = GSS_C_NO_CONTEXT;
666 if (strlen(buf) <= 3) {
667 debug((
char *)
"%s| %s: ERROR: Invalid negotiate request [%s]\n",
LogTime(),
PROGRAM, buf);
668 fprintf(stdout,
"BH Invalid negotiate request\n");
671 const char *b64Token = buf+3;
672 const size_t srcLen = strlen(buf+3);
674 debug((
char *)
"%s| %s: DEBUG: Decode '%s' (decoded length estimate: %d).\n",
676 input_token.value =
xmalloc(input_token.length);
681 if (!
base64_decode_update(&ctx, &dstLen,
static_cast<uint8_t*
>(input_token.value), srcLen, b64Token) ||
683 debug((
char *)
"%s| %s: ERROR: Invalid base64 token [%s]\n",
LogTime(),
PROGRAM, b64Token);
684 fprintf(stdout,
"BH Invalid negotiate request token\n");
687 input_token.length = dstLen;
691 debug((
char *)
"%s| %s: WARNING: received type %d NTLM token\n",
693 (
int) *((
unsigned char *) input_token.value +
695 fprintf(stdout,
"BH received type %d NTLM token\n",
696 (
int) *((
unsigned char *) input_token.value +
700 if (service_principal) {
701 if (strcasecmp(service_principal,
"GSS_C_NO_NAME")) {
702 major_status = gss_import_name(&minor_status, &service,
703 (gss_OID) GSS_C_NULL_OID, &server_name);
706 server_name = GSS_C_NO_NAME;
707 major_status = GSS_S_COMPLETE;
711 major_status = gss_import_name(&minor_status, &service,
719 gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
720 GSS_C_NO_OID_SET, GSS_C_ACCEPT, &server_creds,
nullptr,
nullptr);
721 if (
check_gss_err(major_status, minor_status,
"gss_acquire_cred()",
log, 1))
724 major_status = gss_accept_sec_context(&minor_status,
728 GSS_C_NO_CHANNEL_BINDINGS,
729 &client_name,
nullptr, &output_token, &ret_flags,
nullptr,
nullptr);
731 if (output_token.length) {
732 spnegoToken = (
const unsigned char *) output_token.value;
733 spnegoTokenLength = output_token.length;
735 if (token ==
nullptr) {
737 fprintf(stdout,
"BH Not enough memory\n");
742 size_t blen =
base64_encode_update(&tokCtx, token, spnegoTokenLength,
reinterpret_cast<const uint8_t*
>(spnegoToken));
746 if (
check_gss_err(major_status, minor_status,
"gss_accept_sec_context()",
log, 1))
748 if (major_status & GSS_S_CONTINUE_NEEDED) {
750 fprintf(stdout,
"TT token=%s\n", token);
753 gss_release_buffer(&minor_status, &output_token);
755 gss_display_name(&minor_status, client_name, &output_token,
758 if (
check_gss_err(major_status, minor_status,
"gss_display_name()",
log, 1))
760 user = (
char *)
xmalloc(output_token.length + 1);
761 if (user ==
nullptr) {
763 fprintf(stdout,
"BH Not enough memory\n");
766 memcpy(user, output_token.value, output_token.length);
767 user[output_token.length] =
'\0';
768 if (norealm && (p = strchr(user,
'@')) !=
nullptr) {
773 ret = krb5_init_context(&context);
775 #if HAVE_LIBHEIMDAL_KRB5
776 #define ADWIN2KPAC 128
777 major_status = gsskrb5_extract_authz_data_from_sec_context(&minor_status,
778 gss_context, ADWIN2KPAC, &data_set);
780 "gsskrb5_extract_authz_data_from_sec_context()",
log, 0)) {
781 ret = krb5_pac_parse(context, data_set.value, data_set.length, &pac);
782 gss_release_buffer(&minor_status, &data_set);
784 ag = get_ad_groups((
char *)&ad_groups, context, pac);
785 krb5_pac_free(context, pac);
787 krb5_free_context(context);
790 type_id.value = (
void *)
"mspac";
791 type_id.length = strlen((
char *)type_id.value);
792 #define KRB5PACLOGONINFO 1
793 major_status = gss_map_name_to_any(&minor_status, client_name, KRB5PACLOGONINFO, &type_id, (gss_any_t *)&pac);
794 if (!
check_gss_err(major_status, minor_status,
"gss_map_name_to_any()",
log, 0)) {
795 ag = get_ad_groups((
char *)&ad_groups,context, pac);
797 (void)gss_release_any_name_mapping(&minor_status, client_name, &type_id, (gss_any_t *)&pac);
798 krb5_free_context(context);
807 fprintf(stdout,
"OK token=%s user=%s %s\n", token, rfc_user, ag?ag:
"group=");
809 fprintf(stdout,
"OK token=%s user=%s\n", token, rfc_user);
811 debug((
char *)
"%s| %s: DEBUG: OK token=%s user=%s\n",
LogTime(),
PROGRAM, token, rfc_user);
813 fprintf(stderr,
"%s| %s: INFO: User %s authenticated\n",
LogTime(),
817 if (
check_gss_err(major_status, minor_status,
"gss_accept_sec_context()",
log, 1))
819 if (major_status & GSS_S_CONTINUE_NEEDED) {
822 fprintf(stdout,
"ERR\n");
825 gss_release_buffer(&minor_status, &output_token);
827 gss_display_name(&minor_status, client_name, &output_token,
830 if (
check_gss_err(major_status, minor_status,
"gss_display_name()",
log, 1))
835 user = (
char *)
xmalloc(output_token.length + 1);
836 if (user ==
nullptr) {
838 fprintf(stdout,
"BH Not enough memory\n");
841 memcpy(user, output_token.value, output_token.length);
842 user[output_token.length] =
'\0';
843 if (norealm && (p = strchr(user,
'@')) !=
nullptr) {
848 fprintf(stdout,
"OK token=%s user=%s %s\n",
"AA==", rfc_user, ag?ag:
"group=");
850 fprintf(stdout,
"OK token=%s user=%s\n",
"AA==", rfc_user);
852 debug((
char *)
"%s| %s: DEBUG: OK token=%s user=%s\n",
LogTime(),
PROGRAM,
"AA==", rfc_user);
854 fprintf(stderr,
"%s| %s: INFO: User %s authenticated\n",
LogTime(),
858 gss_release_buffer(&minor_status, &input_token);
859 gss_release_buffer(&minor_status, &output_token);
860 gss_release_cred(&minor_status, &server_creds);
862 gss_release_name(&minor_status, &server_name);
864 gss_release_name(&minor_status, &client_name);
882 #ifndef MAX_AUTHTOKEN_LEN
883 #define MAX_AUTHTOKEN_LEN 65535
886 main(
int argc,
char *
const argv[])
888 setbuf(stdout,
nullptr);
889 setbuf(stdin,
nullptr);
892 if (fgets(buf,
sizeof(buf) - 1, stdin) ==
NULL) {
893 fprintf(stdout,
"BH input error\n");
896 fprintf(stdout,
"BH Kerberos authentication not supported\n");