#include "includes.h"
#include "system/filesys.h"
#include "krb5_samba.h"
-#include "lib/util/asn1.h"
#ifdef HAVE_COM_ERR_H
#include <com_err.h>
#define SMB_STRDUP(s) strdup(s)
#endif
+/**********************************************************
+ * MISSING FUNCTIONS
+ **********************************************************/
+
#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
+
+#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
+krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
+ krb5_auth_context auth_context,
+ krb5_keyblock *keyblock)
+{
+ return krb5_auth_con_setkey(context, auth_context, keyblock);
+}
+#endif
+
+#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
+void krb5_free_unparsed_name(krb5_context context, char *val)
+{
+ SAFE_FREE(val);
+}
+#endif
+
+#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
+const krb5_data *krb5_princ_component(krb5_context context,
+ krb5_principal principal, int i);
+
+const krb5_data *krb5_princ_component(krb5_context context,
+ krb5_principal principal, int i)
+{
+ static krb5_data kdata;
+
+ kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
+ kdata.length = strlen((const char *)kdata.data);
+ return &kdata;
+}
+#endif
+
+
+/**********************************************************
+ * WRAPPING FUNCTIONS
+ **********************************************************/
+
#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
/* HEIMDAL */
- bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
+
+/**
+ * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
+ *
+ * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
+ * address from.
+ *
+ * @param[out] pkaddr A Kerberos address to store tha address in.
+ *
+ * @return True on success, false if an error occured.
+ */
+bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
+ krb5_address *pkaddr)
{
memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
}
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
/* MIT */
-bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
+
+/**
+ * @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
+ *
+ * @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
+ * address from.
+ *
+ * @param[in] pkaddr A Kerberos address to store tha address in.
+ *
+ * @return True on success, false if an error occured.
+ */
+bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
+ krb5_address *pkaddr)
{
memset(pkaddr, '\0', sizeof(krb5_address));
#if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
#error UNKNOWN_ADDRTYPE
#endif
+krb5_error_code smb_krb5_mk_error(krb5_context context,
+ krb5_error_code error_code,
+ const char *e_text,
+ krb5_data *e_data,
+ const krb5_principal client,
+ const krb5_principal server,
+ krb5_data *enc_err)
+{
+ krb5_error_code code = EINVAL;
+#ifdef SAMBA4_USES_HEIMDAL
+ code = krb5_mk_error(context,
+ error_code,
+ e_text,
+ e_data,
+ client,
+ server,
+ NULL, /* client_time */
+ NULL, /* client_usec */
+ enc_err);
+#else
+ krb5_principal unspec_server = NULL;
+ krb5_error errpkt;
+
+ errpkt.ctime = 0;
+ errpkt.cusec = 0;
+
+ code = krb5_us_timeofday(context,
+ &errpkt.stime,
+ &errpkt.susec);
+ if (code != 0) {
+ return code;
+ }
+
+ errpkt.error = error_code;
+
+ errpkt.text.length = 0;
+ if (e_text != NULL) {
+ errpkt.text.length = strlen(e_text);
+ errpkt.text.data = discard_const_p(char, e_text);
+ }
+
+ errpkt.e_data.magic = KV5M_DATA;
+ errpkt.e_data.length = 0;
+ errpkt.e_data.data = NULL;
+ if (e_data != NULL) {
+ errpkt.e_data = *e_data;
+ }
+
+ errpkt.client = client;
+
+ if (server != NULL) {
+ errpkt.server = server;
+ } else {
+ code = smb_krb5_make_principal(context,
+ &unspec_server,
+ "<unspecified realm>",
+ NULL);
+ if (code != 0) {
+ return code;
+ }
+ errpkt.server = unspec_server;
+ }
+
+ code = krb5_mk_error(context,
+ &errpkt,
+ enc_err);
+ krb5_free_principal(context, unspec_server);
+#endif
+ return code;
+}
+
/**
* @brief Create a keyblock based on input parameters
*
* @param context The krb5_context
* @param host_princ The krb5_principal to use
-* @param salt The optional salt, if ommitted, salt is calculated with
+* @param salt The optional salt, if omitted, salt is calculated with
* the provided principal.
* @param password The krb5_data containing the password
* @param enctype The krb5_enctype to use for the keyblock generation
* @param host_princ The krb5_principal to create the salt for
* @param psalt A pointer to a krb5_data struct
*
-* caller has to free the contents of psalt with kerberos_free_data_contents
+* caller has to free the contents of psalt with smb_krb5_free_data_contents
* when function has succeeded
*
* @return krb5_error_code, returns 0 on success, error code otherwise
#endif
#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
- krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
+/**
+ * @brief Get a list of encryption types allowed for session keys
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] enctypes An allocated, zero-terminated list of encryption types
+ *
+ * This function returns an allocated list of encryption types allowed for
+ * session keys.
+ *
+ * Use free() to free the enctypes when it is no longer needed.
+ *
+ * @retval 0 Success; otherwise - Kerberos error codes
+ */
+krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
krb5_enctype **enctypes)
{
return krb5_get_permitted_enctypes(context, enctypes);
}
#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
- krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
+krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
krb5_enctype **enctypes)
{
#ifdef HAVE_KRB5_PDU_NONE_DECL
#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
#endif
-#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
- krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
- krb5_auth_context auth_context,
- krb5_keyblock *keyblock)
-{
- return krb5_auth_con_setkey(context, auth_context, keyblock);
-}
-#endif
-
-bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
- DATA_BLOB *edata,
- DATA_BLOB *edata_out)
-{
- DATA_BLOB edata_contents;
- ASN1_DATA *data;
- int edata_type;
-
- if (!edata->length) {
- return false;
- }
-
- data = asn1_init(mem_ctx);
- if (data == NULL) {
- return false;
- }
-
- if (!asn1_load(data, *edata)) goto err;
- if (!asn1_start_tag(data, ASN1_SEQUENCE(0))) goto err;
- if (!asn1_start_tag(data, ASN1_CONTEXT(1))) goto err;
- if (!asn1_read_Integer(data, &edata_type)) goto err;
-
- if (edata_type != KRB5_PADATA_PW_SALT) {
- DEBUG(0,("edata is not of required type %d but of type %d\n",
- KRB5_PADATA_PW_SALT, edata_type));
- goto err;
- }
-
- if (!asn1_start_tag(data, ASN1_CONTEXT(2))) goto err;
- if (!asn1_read_OctetString(data, talloc_tos(), &edata_contents)) goto err;
- if (!asn1_end_tag(data)) goto err;
- if (!asn1_end_tag(data)) goto err;
- if (!asn1_end_tag(data)) goto err;
- asn1_free(data);
-
- *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
-
- data_blob_free(&edata_contents);
-
- return true;
-
- err:
-
- asn1_free(data);
- return false;
-}
-
-
-static bool ads_cleanup_expired_creds(krb5_context context,
- krb5_ccache ccache,
- krb5_creds *credsp)
-{
- krb5_error_code retval;
- const char *cc_type = krb5_cc_get_type(context, ccache);
-
- DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
- cc_type, krb5_cc_get_name(context, ccache),
- http_timestring(talloc_tos(), credsp->times.endtime)));
-
- /* we will probably need new tickets if the current ones
- will expire within 10 seconds.
- */
- if (credsp->times.endtime >= (time(NULL) + 10))
- return false;
-
- /* heimdal won't remove creds from a file ccache, and
- perhaps we shouldn't anyway, since internally we
- use memory ccaches, and a FILE one probably means that
- we're using creds obtained outside of our exectuable
- */
- if (strequal(cc_type, "FILE")) {
- DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
- return false;
- }
-
- retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
- if (retval) {
- DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
- error_message(retval)));
- /* If we have an error in this, we want to display it,
- but continue as though we deleted it */
- }
- return true;
-}
-
-/* Allocate and setup the auth context into the state we need. */
-
-static krb5_error_code setup_auth_context(krb5_context context,
- krb5_auth_context *auth_context)
-{
- krb5_error_code retval;
-
- retval = krb5_auth_con_init(context, auth_context );
- if (retval) {
- DEBUG(1,("krb5_auth_con_init failed (%s)\n",
- error_message(retval)));
- return retval;
- }
-
- /* Ensure this is an addressless ticket. */
- retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
- if (retval) {
- DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
- error_message(retval)));
- }
-
- return retval;
-}
-
-#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
-static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
- uint32_t gss_flags)
-{
- unsigned int orig_length = in_data->length;
- unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
- char *gss_cksum = NULL;
-
- if (orig_length) {
- /* Extra length field for delgated ticket. */
- base_cksum_size += 4;
- }
-
- if ((unsigned int)base_cksum_size + orig_length <
- (unsigned int)base_cksum_size) {
- return EINVAL;
- }
-
- gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
- if (gss_cksum == NULL) {
- return ENOMEM;
- }
-
- memset(gss_cksum, '\0', base_cksum_size + orig_length);
- SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
-
- /*
- * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
- * This matches the behavior of heimdal and mit.
- *
- * And it is needed to work against some closed source
- * SMB servers.
- *
- * See bug #7883
- */
- memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
-
- SIVAL(gss_cksum, 20, gss_flags);
-
- if (orig_length) {
- SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
- SSVAL(gss_cksum, 26, orig_length);
- /* Copy the kerberos KRB_CRED data */
- memcpy(gss_cksum + 28, in_data->data, orig_length);
- free(in_data->data);
- in_data->data = NULL;
- in_data->length = 0;
- }
- in_data->data = gss_cksum;
- in_data->length = base_cksum_size + orig_length;
- return 0;
-}
-#endif
-
-/**************************************************************
- krb5_parse_name that takes a UNIX charset.
-**************************************************************/
+/**
+ * @brief Convert a string principal name to a Kerberos principal.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] name The principal as a unix charset string.
+ *
+ * @param[out] principal The newly allocated principal.
+ *
+ * Use krb5_free_principal() to free a principal when it is no longer needed.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
krb5_error_code smb_krb5_parse_name(krb5_context context,
- const char *name, /* in unix charset */
- krb5_principal *principal)
+ const char *name,
+ krb5_principal *principal)
{
krb5_error_code ret;
char *utf8_name;
return ret;
}
-#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
-void krb5_free_unparsed_name(krb5_context context, char *val)
-{
- SAFE_FREE(val);
-}
-#endif
-
-/**************************************************************
- krb5_parse_name that returns a UNIX charset name. Must
- be freed with talloc_free() call.
-**************************************************************/
-
+/**
+ * @brief Convert a Kerberos principal structure to a string representation.
+ *
+ * The resulting string representation will be a unix charset name and is
+ * talloc'ed.
+ *
+ * @param[in] mem_ctx The talloc context to allocate memory on.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] principal The principal.
+ *
+ * @param[out] unix_name A string representation of the princpial name as with
+ * unix charset.
+ *
+ * Use talloc_free() to free the string representation if it is no longer
+ * needed.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_const_principal principal,
return 0;
}
-krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
- const char *name,
- krb5_principal *principal)
-{
- /* we are cheating here because parse_name will in fact set the realm.
- * We don't care as the only caller of smb_krb5_parse_name_norealm
- * ignores the realm anyway when calling
- * smb_krb5_principal_compare_any_realm later - Guenther */
-
- return smb_krb5_parse_name(context, name, principal);
-}
-
-bool smb_krb5_principal_compare_any_realm(krb5_context context,
- krb5_const_principal princ1,
- krb5_const_principal princ2)
+/**
+ * @brief Free the contents of a krb5_data structure and zero the data field.
+ *
+ * @param[in] context The krb5 context
+ *
+ * @param[in] pdata The data structure to free contents of
+ *
+ * This function frees the contents, not the structure itself.
+ */
+void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
{
- return krb5_principal_compare_any_realm(context, princ1, princ2);
-}
-
-/*
- we can't use krb5_mk_req because w2k wants the service to be in a particular format
-*/
-static krb5_error_code ads_krb5_mk_req(krb5_context context,
- krb5_auth_context *auth_context,
- const krb5_flags ap_req_options,
- const char *principal,
- krb5_ccache ccache,
- krb5_data *outbuf,
- time_t *expire_time,
- const char *impersonate_princ_s)
-{
- krb5_error_code retval;
- krb5_principal server;
- krb5_principal impersonate_princ = NULL;
- krb5_creds * credsp;
- krb5_creds creds;
- krb5_data in_data;
- bool creds_ready = false;
- int i = 0, maxtries = 3;
-
- ZERO_STRUCT(in_data);
-
- retval = smb_krb5_parse_name(context, principal, &server);
- if (retval) {
- DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
- return retval;
- }
-
- if (impersonate_princ_s) {
- retval = smb_krb5_parse_name(context, impersonate_princ_s,
- &impersonate_princ);
- if (retval) {
- DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
- goto cleanup_princ;
- }
- }
-
- /* obtain ticket & session key */
- ZERO_STRUCT(creds);
- if ((retval = krb5_copy_principal(context, server, &creds.server))) {
- DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
- error_message(retval)));
- goto cleanup_princ;
- }
-
- if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
- /* This can commonly fail on smbd startup with no ticket in the cache.
- * Report at higher level than 1. */
- DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
- error_message(retval)));
- goto cleanup_creds;
- }
-
- while (!creds_ready && (i < maxtries)) {
-
- if ((retval = smb_krb5_get_credentials(context, ccache,
- creds.client,
- creds.server,
- impersonate_princ,
- &credsp))) {
- DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
- principal, error_message(retval)));
- goto cleanup_creds;
- }
-
- /* cope with ticket being in the future due to clock skew */
- if ((unsigned)credsp->times.starttime > time(NULL)) {
- time_t t = time(NULL);
- int time_offset =(int)((unsigned)credsp->times.starttime-t);
- DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
- krb5_set_real_time(context, t + time_offset + 1, 0);
- }
-
- if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
- creds_ready = true;
- }
-
- i++;
- }
-
- DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
- principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
- http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
- (unsigned)credsp->times.endtime));
-
- if (expire_time) {
- *expire_time = (time_t)credsp->times.endtime;
- }
-
- /* Allocate the auth_context. */
- retval = setup_auth_context(context, auth_context);
- if (retval) {
- DEBUG(1,("setup_auth_context failed (%s)\n",
- error_message(retval)));
- goto cleanup_creds;
- }
-
-#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
- {
- uint32_t gss_flags = 0;
-
- if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
- /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
- as part of the kerberos exchange. */
-
- DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
-
- retval = krb5_auth_con_setuseruserkey(context,
- *auth_context,
- &credsp->keyblock );
- if (retval) {
- DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
- error_message(retval)));
- goto cleanup_creds;
- }
-
- /* Must use a subkey for forwarded tickets. */
- retval = krb5_auth_con_setflags(context,
- *auth_context,
- KRB5_AUTH_CONTEXT_USE_SUBKEY);
- if (retval) {
- DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
- error_message(retval)));
- goto cleanup_creds;
- }
-
- retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
- *auth_context, /* Authentication context [in] */
- discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
- credsp->client, /* Client principal for the tgt [in] */
- credsp->server, /* Server principal for the tgt [in] */
- ccache, /* Credential cache to use for storage [in] */
- 1, /* Turn on for "Forwardable ticket" [in] */
- &in_data ); /* Resulting response [out] */
-
- if (retval) {
- DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
- error_message( retval ) ) );
-
- /*
- * This is not fatal. Delete the *auth_context and continue
- * with krb5_mk_req_extended to get a non-forwardable ticket.
- */
-
- if (in_data.data) {
- free( in_data.data );
- in_data.data = NULL;
- in_data.length = 0;
- }
- krb5_auth_con_free(context, *auth_context);
- *auth_context = NULL;
- retval = setup_auth_context(context, auth_context);
- if (retval) {
- DEBUG(1,("setup_auth_context failed (%s)\n",
- error_message(retval)));
- goto cleanup_creds;
- }
- } else {
- /* We got a delegated ticket. */
- gss_flags |= GSS_C_DELEG_FLAG;
- }
- }
-
- /* Frees and reallocates in_data into a GSS checksum blob. */
- retval = create_gss_checksum(&in_data, gss_flags);
- if (retval) {
- goto cleanup_data;
- }
-
- /* We always want GSS-checksum types. */
- retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
- if (retval) {
- DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
- error_message(retval)));
- goto cleanup_data;
- }
- }
-#endif
-
- retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
- &in_data, credsp, outbuf);
- if (retval) {
- DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
- error_message(retval)));
- }
-
-#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
-cleanup_data:
-#endif
-
- if (in_data.data) {
- free( in_data.data );
- in_data.length = 0;
- }
-
- krb5_free_creds(context, credsp);
-
-cleanup_creds:
- krb5_free_cred_contents(context, &creds);
-
-cleanup_princ:
- krb5_free_principal(context, server);
- if (impersonate_princ) {
- krb5_free_principal(context, impersonate_princ);
- }
-
- return retval;
-}
-
-void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
-{
-#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
- if (pdata->data) {
- krb5_free_data_contents(context, pdata);
- }
-#elif defined(HAVE_KRB5_DATA_FREE)
- krb5_data_free(context, pdata);
-#else
- SAFE_FREE(pdata->data);
-#endif
+#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
+ if (pdata->data) {
+ krb5_free_data_contents(context, pdata);
+ }
+#elif defined(HAVE_KRB5_DATA_FREE)
+ krb5_data_free(context, pdata);
+#else
+ SAFE_FREE(pdata->data);
+#endif
}
/*
* @param[in] length The length of the data to copy
* @return krb5_error_code
*
- * Caller has to free krb5_data with kerberos_free_data_contents().
+ * Caller has to free krb5_data with smb_krb5_free_data_contents().
*/
-
-krb5_error_code krb5_copy_data_contents(krb5_data *p,
- const void *data,
- size_t len)
+krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
+ const void *data,
+ size_t len)
{
#if defined(HAVE_KRB5_DATA_COPY)
return krb5_data_copy(p, data, len);
#endif
}
-/*
- get a kerberos5 ticket for the given service
-*/
-int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
- const char *principal, time_t time_offset,
- DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
- uint32_t extra_ap_opts, const char *ccname,
- time_t *tgs_expire,
- const char *impersonate_princ_s)
-
-{
- krb5_error_code retval;
- krb5_data packet;
- krb5_context context = NULL;
- krb5_ccache ccdef = NULL;
- krb5_auth_context auth_context = NULL;
- krb5_enctype enc_types[] = {
-#ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
- ENCTYPE_AES256_CTS_HMAC_SHA1_96,
-#endif
-#ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
- ENCTYPE_AES128_CTS_HMAC_SHA1_96,
-#endif
- ENCTYPE_ARCFOUR_HMAC,
- ENCTYPE_DES_CBC_MD5,
- ENCTYPE_DES_CBC_CRC,
- ENCTYPE_NULL};
-
- initialize_krb5_error_table();
- retval = krb5_init_context(&context);
- if (retval) {
- DEBUG(1, ("krb5_init_context failed (%s)\n",
- error_message(retval)));
- goto failed;
- }
-
- if (time_offset != 0) {
- krb5_set_real_time(context, time(NULL) + time_offset, 0);
- }
-
- if ((retval = krb5_cc_resolve(context, ccname ?
- ccname : krb5_cc_default_name(context), &ccdef))) {
- DEBUG(1, ("krb5_cc_default failed (%s)\n",
- error_message(retval)));
- goto failed;
- }
-
- if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
- DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
- error_message(retval)));
- goto failed;
- }
-
- retval = ads_krb5_mk_req(context, &auth_context,
- AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
- principal, ccdef, &packet,
- tgs_expire, impersonate_princ_s);
- if (retval) {
- goto failed;
- }
-
- get_krb5_smb_session_key(mem_ctx, context, auth_context,
- session_key_krb5, false);
-
- *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
-
- kerberos_free_data_contents(context, &packet);
-
-failed:
-
- if (context) {
- if (ccdef)
- krb5_cc_close(context, ccdef);
- if (auth_context)
- krb5_auth_con_free(context, auth_context);
- krb5_free_context(context);
- }
-
- return retval;
-}
-
-bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
- krb5_context context,
- krb5_auth_context auth_context,
- DATA_BLOB *session_key, bool remote)
+bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
+ krb5_context context,
+ krb5_auth_context auth_context,
+ DATA_BLOB *session_key,
+ bool remote)
{
krb5_keyblock *skey = NULL;
krb5_error_code err = 0;
bool ret = false;
if (remote) {
+#ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
+ err = krb5_auth_con_getrecvsubkey(context,
+ auth_context,
+ &skey);
+#else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
err = krb5_auth_con_getremotesubkey(context,
auth_context, &skey);
+#endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
} else {
+#ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
+ err = krb5_auth_con_getsendsubkey(context,
+ auth_context,
+ &skey);
+#else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
err = krb5_auth_con_getlocalsubkey(context,
auth_context, &skey);
+#endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
}
if (err || skey == NULL) {
}
-#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
- const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
-
- const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
-{
- static krb5_data kdata;
-
- kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
- kdata.length = strlen((const char *)kdata.data);
- return &kdata;
-}
-#endif
-
-/*
+/**
* @brief Get talloced string component of a principal
*
* @param[in] mem_ctx The TALLOC_CTX
* Caller must talloc_free if the return value is not NULL.
*
*/
-
-/* caller has to free returned string with talloc_free() */
char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_const_principal principal,
#endif
}
-/* Prototypes */
-
- krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
- const char *client_string, /* gd@BER.SUSE.DE */
- const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
- time_t *expire_time)
+/**
+ * @brief
+ *
+ * @param[in] ccache_string A string pointing to the cache to renew the ticket
+ * (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
+ * ccache has not been specified, the default ccache
+ * will be used.
+ *
+ * @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
+ * or NULL. If the principal string has not been
+ * specified, the principal from the ccache will be
+ * retrieved.
+ *
+ * @param[in] service_string The service ticket string
+ * (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
+ * the sevice ticket is specified, it is parsed (
+ * with the realm part ignored) and used as the
+ * server principal of the credential. Otherwise
+ * the ticket-granting service is used.
+ *
+ * @param[in] expire_time A pointer to store the credentials end time or
+ * NULL.
+ *
+ * @return 0 on Succes, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
+ const char *client_string,
+ const char *service_string,
+ time_t *expire_time)
{
krb5_error_code ret;
krb5_context context = NULL;
return ret;
}
- krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
+/**
+ * @brief Free the data stored in an smb_krb5_addresses structure.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] addr The address structure to free.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_free_addresses(krb5_context context,
+ smb_krb5_addresses *addr)
{
krb5_error_code ret = 0;
if (addr == NULL) {
}
#define MAX_NETBIOSNAME_LEN 16
- krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
+
+/**
+ * @brief Add a netbios name to the array of addresses
+ *
+ * @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
+ * netbios name to.
+ *
+ * @param[in] netbios_name The netbios name to add.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
const char *netbios_name)
{
krb5_error_code ret = 0;
return ret;
}
- void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
-{
-#ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
- krb5_free_error_contents(context, krberror);
-#else /* MIT */
- krb5_free_error(context, krberror);
-#endif
-}
-
- krb5_error_code handle_krberror_packet(krb5_context context,
- krb5_data *packet)
-{
- krb5_error_code ret;
- bool got_error_code = false;
-
- DEBUG(10,("handle_krberror_packet: got error packet\n"));
-
-#ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
- {
- krb5_error krberror;
-
- if ((ret = krb5_rd_error(context, packet, &krberror))) {
- DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
- error_message(ret)));
- return ret;
- }
-
- if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
- ret = (krb5_error_code) krberror.error_code;
- got_error_code = true;
- }
-
- smb_krb5_free_error(context, &krberror);
- }
-#else /* MIT */
- {
- krb5_error *krberror;
-
- if ((ret = krb5_rd_error(context, packet, &krberror))) {
- DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
- error_message(ret)));
- return ret;
- }
-
- if (krberror->e_data.data == NULL) {
-#if defined(ERROR_TABLE_BASE_krb5)
- ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
-#else
- ret = (krb5_error_code)krberror->error;
-#endif
- got_error_code = true;
- }
- smb_krb5_free_error(context, krberror);
- }
-#endif
- if (got_error_code) {
- DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
- error_message(ret), ret));
- }
- return ret;
-}
-
-krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
- krb5_get_init_creds_opt **opt)
-{
- /* Heimdal or modern MIT version */
- return krb5_get_init_creds_opt_alloc(context, opt);
-}
-
-void smb_krb5_get_init_creds_opt_free(krb5_context context,
- krb5_get_init_creds_opt *opt)
-{
- /* Modern MIT or Heimdal version */
- krb5_get_init_creds_opt_free(context, opt);
-}
-
-krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
+/**
+ * @brief Get the enctype from a key table entry
+ *
+ * @param[in] kt_entry Key table entry to get the enctype from.
+ *
+ * @return The enctype from the entry.
+ */
+krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
{
return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
}
+/**
+ * @brief Free the contents of a key table entry.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] kt_entry The key table entry to free the contents of.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ *
+ * The pointer itself is not freed.
+ */
krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
krb5_keytab_entry *kt_entry)
{
}
-/* caller needs to free etype_s */
+/**
+ * @brief Convert an encryption type to a string.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] enctype The encryption type.
+ *
+ * @param[in] etype_s A pointer to store the allocated encryption type as a
+ * string.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ *
+ * The caller needs to free the allocated string etype_s.
+ */
krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
- krb5_enctype enctype,
+ krb5_enctype enctype,
char **etype_s)
{
#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
#endif
}
-/**********************************************************************
- * Open a krb5 keytab with flags, handles readonly or readwrite access and
- * allows to process non-default keytab names.
- * @param context krb5_context
- * @param keytab_name_req string
- * @param write_access bool if writable keytab is required
- * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
- * @return krb5_error_code
-**********************************************************************/
-
/* This MAX_NAME_LEN is a constant defined in krb5.h */
#ifndef MAX_KEYTAB_NAME_LEN
#define MAX_KEYTAB_NAME_LEN 1100
#endif
-krb5_error_code smb_krb5_open_keytab(krb5_context context,
- const char *keytab_name_req,
- bool write_access,
- krb5_keytab *keytab)
+/**
+ * @brief Open a key table readonly or with readwrite access.
+ *
+ * Allows to use a different keytab than the default one using a relative
+ * path to the keytab.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] keytab_name_req The path to the key table.
+ *
+ * @param[in] write_access Open with readwrite access.
+ *
+ * @param[in] keytab A pointer o the opended key table.
+ *
+ * The keytab pointer should be freed using krb5_kt_close().
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
+ const char *keytab_name_req,
+ bool write_access,
+ krb5_keytab *keytab)
{
krb5_error_code ret = 0;
TALLOC_CTX *mem_ctx;
goto out;
}
- if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
- (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
- tmp = keytab_name_req;
+ if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
+ (strncmp(keytab_name_req, "FILE:", 5) == 0)) {
+ tmp = keytab_name_req;
goto resolve;
}
- if (keytab_name_req[0] != '/') {
- ret = KRB5_KT_BADNAME;
- goto out;
- }
-
tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
if (!tmp) {
ret = ENOMEM;
goto out;
}
- resolve:
- DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
+resolve:
+ DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
ret = krb5_kt_resolve(context, tmp, keytab);
- out:
- TALLOC_FREE(mem_ctx);
- return ret;
+out:
+ TALLOC_FREE(mem_ctx);
+ return ret;
+}
+
+/**
+ * @brief Open a key table readonly or with readwrite access.
+ *
+ * Allows to use a different keytab than the default one. The path needs to be
+ * an absolute path or an error will be returned.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] keytab_name_req The path to the key table.
+ *
+ * @param[in] write_access Open with readwrite access.
+ *
+ * @param[in] keytab A pointer o the opended key table.
+ *
+ * The keytab pointer should be freed using krb5_kt_close().
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kt_open(krb5_context context,
+ const char *keytab_name_req,
+ bool write_access,
+ krb5_keytab *keytab)
+{
+ int cmp;
+
+ if (keytab_name_req == NULL) {
+ return KRB5_KT_BADNAME;
+ }
+
+ if (keytab_name_req[0] == '/') {
+ goto open_keytab;
+ }
+
+ cmp = strncmp(keytab_name_req, "FILE:/", 6);
+ if (cmp == 0) {
+ goto open_keytab;
+ }
+
+ cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
+ if (cmp == 0) {
+ goto open_keytab;
+ }
+
+ return KRB5_KT_BADNAME;
+
+open_keytab:
+ return smb_krb5_kt_open_relative(context,
+ keytab_name_req,
+ write_access,
+ keytab);
}
-krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
+/**
+ * @brief Get a key table name.
+ *
+ * @param[in] mem_ctx The talloc context to use for allocation.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] keytab The key table to get the name from.
+ *
+ * @param[in] keytab_name A talloc'ed string of the key table name.
+ *
+ * The talloc'ed name string needs to be freed with talloc_free().
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
krb5_context context,
krb5_keytab keytab,
const char **keytab_name)
return ret;
}
+/**
+ * @brief Seek and delete old entries in a keytab based on the passed
+ * principal.
+ *
+ * @param[in] context The KRB5 context to use.
+ *
+ * @param[in] keytab The keytab to operate on.
+ *
+ * @param[in] kvno The kvnco to use.
+ *
+ * @param[in] princ_s The principal as a string to search for.
+ *
+ * @param[in] princ The principal as a krb5_principal to search for.
+ *
+ * @param[in] flush Weather to flush the complete keytab.
+ *
+ * @param[in] keep_old_entries Keep the entry with the previous kvno.
+ *
+ * @retval 0 on Sucess
+ *
+ * @return An appropriate KRB5 error code.
+ */
+krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
+ krb5_keytab keytab,
+ krb5_kvno kvno,
+ krb5_enctype enctype,
+ const char *princ_s,
+ krb5_principal princ,
+ bool flush,
+ bool keep_old_entries)
+{
+ krb5_error_code ret;
+ krb5_kt_cursor cursor;
+ krb5_keytab_entry kt_entry;
+ char *ktprinc = NULL;
+ krb5_kvno old_kvno = kvno - 1;
+ TALLOC_CTX *tmp_ctx;
+
+ ZERO_STRUCT(cursor);
+ ZERO_STRUCT(kt_entry);
+
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret == KRB5_KT_END || ret == ENOENT ) {
+ /* no entries */
+ return 0;
+ }
+
+ tmp_ctx = talloc_new(NULL);
+ if (tmp_ctx == NULL) {
+ return ENOMEM;
+ }
+
+ DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
+ while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
+ bool name_ok = false;
+ krb5_enctype kt_entry_enctype =
+ smb_krb5_kt_get_enctype_from_entry(&kt_entry);
+
+ if (!flush && (princ_s != NULL)) {
+ ret = smb_krb5_unparse_name(tmp_ctx, context,
+ kt_entry.principal,
+ &ktprinc);
+ if (ret) {
+ DEBUG(1, (__location__
+ ": smb_krb5_unparse_name failed "
+ "(%s)\n", error_message(ret)));
+ goto out;
+ }
+
+#ifdef HAVE_KRB5_KT_COMPARE
+ name_ok = krb5_kt_compare(context, &kt_entry,
+ princ, 0, 0);
+#else
+ name_ok = (strcmp(ktprinc, princ_s) == 0);
+#endif
+
+ if (!name_ok) {
+ DEBUG(10, (__location__ ": ignoring keytab "
+ "entry principal %s, kvno = %d\n",
+ ktprinc, kt_entry.vno));
+
+ /* Not a match,
+ * just free this entry and continue. */
+ ret = smb_krb5_kt_free_entry(context,
+ &kt_entry);
+ ZERO_STRUCT(kt_entry);
+ if (ret) {
+ DEBUG(1, (__location__
+ ": smb_krb5_kt_free_entry "
+ "failed (%s)\n",
+ error_message(ret)));
+ goto out;
+ }
+
+ TALLOC_FREE(ktprinc);
+ continue;
+ }
+
+ TALLOC_FREE(ktprinc);
+ }
+
+ /*------------------------------------------------------------
+ * Save the entries with kvno - 1. This is what microsoft does
+ * to allow people with existing sessions that have kvno - 1
+ * to still work. Otherwise, when the password for the machine
+ * changes, all kerberizied sessions will 'break' until either
+ * the client reboots or the client's session key expires and
+ * they get a new session ticket with the new kvno.
+ * Some keytab files only store the kvno in 8bits, limit
+ * the compare accordingly.
+ */
+
+ if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
+ DEBUG(5, (__location__ ": Saving previous (kvno %d) "
+ "entry for principal: %s.\n",
+ old_kvno, princ_s));
+ continue;
+ }
+
+ if (keep_old_entries) {
+ DEBUG(5, (__location__ ": Saving old (kvno %d) "
+ "entry for principal: %s.\n",
+ kvno, princ_s));
+ continue;
+ }
+
+ if (!flush &&
+ (kt_entry.vno == kvno) &&
+ (kt_entry_enctype != enctype))
+ {
+ DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
+ "enctype [%d] for principal: %s.\n",
+ kvno, kt_entry_enctype, princ_s));
+ continue;
+ }
+
+ DEBUG(5, (__location__ ": Found old entry for principal: %s "
+ "(kvno %d) - trying to remove it.\n",
+ princ_s, kt_entry.vno));
+
+ ret = krb5_kt_end_seq_get(context, keytab, &cursor);
+ ZERO_STRUCT(cursor);
+ if (ret) {
+ DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
+ if (ret) {
+ DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+
+ DEBUG(5, (__location__ ": removed old entry for principal: "
+ "%s (kvno %d).\n", princ_s, kt_entry.vno));
+
+ ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+ if (ret) {
+ DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
+ "(%s)\n", error_message(ret)));
+ goto out;
+ }
+ ret = smb_krb5_kt_free_entry(context, &kt_entry);
+ ZERO_STRUCT(kt_entry);
+ if (ret) {
+ DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+ }
+
+out:
+ talloc_free(tmp_ctx);
+ if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
+ smb_krb5_kt_free_entry(context, &kt_entry);
+ }
+ if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
+ krb5_kt_end_seq_get(context, keytab, &cursor);
+ }
+ return ret;
+}
+
+/**
+ * @brief Add a keytab entry for the given principal
+ *
+ * @param[in] context The krb5 context to use.
+ *
+ * @param[in] keytab The keytab to add the entry to.
+ *
+ * @param[in] kvno The kvno to use.
+ *
+ * @param[in] princ_s The principal as a string.
+ *
+ * @param[in] salt_principal The salt principal to salt the password with.
+ * Only needed for keys which support salting.
+ * If no salt is used set no_salt to false and
+ * pass NULL here.
+ *
+ * @param[in] enctype The encryption type of the keytab entry.
+ *
+ * @param[in] password The password of the keytab entry.
+ *
+ * @param[in] no_salt If the password should not be salted. Normally
+ * this is only set to false for encryption types
+ * which do not support salting like RC4.
+ *
+ * @param[in] keep_old_entries Wether to keep or delte old keytab entries.
+ *
+ * @retval 0 on Success
+ *
+ * @return A corresponding KRB5 error code.
+ *
+ * @see smb_krb5_kt_open()
+ */
+krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
+ krb5_keytab keytab,
+ krb5_kvno kvno,
+ const char *princ_s,
+ const char *salt_principal,
+ krb5_enctype enctype,
+ krb5_data *password,
+ bool no_salt,
+ bool keep_old_entries)
+{
+ krb5_error_code ret;
+ krb5_keytab_entry kt_entry;
+ krb5_principal princ = NULL;
+ krb5_keyblock *keyp;
+
+ ZERO_STRUCT(kt_entry);
+
+ ret = smb_krb5_parse_name(context, princ_s, &princ);
+ if (ret) {
+ DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
+ "failed (%s)\n", princ_s, error_message(ret)));
+ goto out;
+ }
+
+ /* Seek and delete old keytab entries */
+ ret = smb_krb5_kt_seek_and_delete_old_entries(context,
+ keytab,
+ kvno,
+ enctype,
+ princ_s,
+ princ,
+ false,
+ keep_old_entries);
+ if (ret) {
+ goto out;
+ }
+
+ /* If we get here, we have deleted all the old entries with kvno's
+ * not equal to the current kvno-1. */
+
+ keyp = KRB5_KT_KEY(&kt_entry);
+
+ if (no_salt) {
+ KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
+ if (KRB5_KEY_DATA(keyp) == NULL) {
+ ret = ENOMEM;
+ goto out;
+ }
+ memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
+ KRB5_KEY_LENGTH(keyp) = password->length;
+ KRB5_KEY_TYPE(keyp) = enctype;
+ } else {
+ krb5_principal salt_princ = NULL;
+
+ /* Now add keytab entries for all encryption types */
+ ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
+ if (ret) {
+ DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
+ salt_principal, error_message(ret));
+ goto out;
+ }
+
+ ret = smb_krb5_create_key_from_string(context,
+ salt_princ,
+ NULL,
+ password,
+ enctype,
+ keyp);
+ krb5_free_principal(context, salt_princ);
+ if (ret != 0) {
+ goto out;
+ }
+ }
+
+ kt_entry.principal = princ;
+ kt_entry.vno = kvno;
+
+ DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
+ "encryption type (%d) and version (%d)\n",
+ princ_s, enctype, kt_entry.vno));
+ ret = krb5_kt_add_entry(context, keytab, &kt_entry);
+ krb5_free_keyblock_contents(context, keyp);
+ ZERO_STRUCT(kt_entry);
+ if (ret) {
+ DEBUG(1, (__location__ ": adding entry to keytab "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
+
+out:
+ if (princ) {
+ krb5_free_principal(context, princ);
+ }
+
+ return ret;
+}
+
#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
defined(HAVE_KRB5_GET_CREDS)
return ret;
}
+/**
+ * @brief Initialize a krb5_keyblock with the given data.
+ *
+ * Initialized a new keyblock, allocates the contents fo the key and
+ * copies the data into the keyblock.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] enctype The encryption type.
+ *
+ * @param[in] data The date to initialize the keyblock with.
+ *
+ * @param[in] length The length of the keyblock.
+ *
+ * @param[in] key Newly allocated keyblock structure.
+ *
+ * The key date must be freed using krb5_free_keyblock_contents() when it is
+ * no longer needed.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
krb5_enctype enctype,
const void *data,
#endif
}
-/*
- simulate a kinit, putting the tgt in the given credentials cache.
- Orignally by remus@snapserver.com
-
- This version is built to use a keyblock, rather than needing the
- original password.
-
- The impersonate_principal is the principal if NULL, or the principal
- to impersonate
-
- The target_service defaults to the krbtgt if NULL, but could be
- kpasswd/realm or the local service (if we are doing s4u2self)
-*/
-krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
- krb5_principal principal,
- krb5_keyblock *keyblock,
- const char *target_service,
- krb5_get_init_creds_opt *krb_options,
- time_t *expire_time,
- time_t *kdc_time)
-{
- krb5_error_code code = 0;
- krb5_creds my_creds;
-
-#if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
+/**
+ * @brief Simulate a kinit by putting the tgt in the given credential cache.
+ *
+ * This function uses a keyblock rather than needingthe original password.
+ *
+ * @param[in] ctx The library context
+ *
+ * @param[in] cc The credential cache to put the tgt in.
+ *
+ * @param[in] principal The client princial
+ *
+ * @param[in] keyblock The keyblock to use.
+ *
+ * @param[in] target_service The service name of the initial credentials (or NULL).
+ *
+ * @param[in] krb_options Initial credential options.
+ *
+ * @param[in] expire_time A pointer to store the experation time of the
+ * credentials (or NULL).
+ *
+ * @param[in] kdc_time A pointer to store the time when the ticket becomes
+ * valid (or NULL).
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
+ krb5_ccache cc,
+ krb5_principal principal,
+ krb5_keyblock *keyblock,
+ const char *target_service,
+ krb5_get_init_creds_opt *krb_options,
+ time_t *expire_time,
+ time_t *kdc_time)
+{
+ krb5_error_code code = 0;
+ krb5_creds my_creds;
+
+#if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
keyblock, 0, target_service,
krb_options);
return code;
}
+#ifndef SAMBA4_USES_HEIMDAL /* MIT */
+ /*
+ * We need to store the principal as returned from the KDC to the
+ * credentials cache. If we don't do that the KRB5 library is not
+ * able to find the tickets it is looking for
+ */
+ principal = my_creds.client;
+#endif
code = krb5_cc_initialize(ctx, cc, principal);
if (code) {
goto done;
return code;
}
-krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
- krb5_principal principal,
- const char *password,
- const char *target_service,
- krb5_get_init_creds_opt *krb_options,
- time_t *expire_time,
- time_t *kdc_time)
+/**
+ * @brief Simulate a kinit by putting the tgt in the given credential cache.
+ *
+ * @param[in] ctx The library context
+ *
+ * @param[in] cc The credential cache to put the tgt in.
+ *
+ * @param[in] principal The client princial
+ *
+ * @param[in] password The password (or NULL).
+ *
+ * @param[in] target_service The service name of the initial credentials (or NULL).
+ *
+ * @param[in] krb_options Initial credential options.
+ *
+ * @param[in] expire_time A pointer to store the experation time of the
+ * credentials (or NULL).
+ *
+ * @param[in] kdc_time A pointer to store the time when the ticket becomes
+ * valid (or NULL).
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
+ krb5_ccache cc,
+ krb5_principal principal,
+ const char *password,
+ const char *target_service,
+ krb5_get_init_creds_opt *krb_options,
+ time_t *expire_time,
+ time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_creds my_creds;
return code;
}
+#ifndef SAMBA4_USES_HEIMDAL /* MIT */
+ /*
+ * We need to store the principal as returned from the KDC to the
+ * credentials cache. If we don't do that the KRB5 library is not
+ * able to find the tickets it is looking for
+ */
+ principal = my_creds.client;
+#endif
code = krb5_cc_initialize(ctx, cc, principal);
if (code) {
goto done;
}
#ifdef SAMBA4_USES_HEIMDAL
-/*
- simulate a kinit, putting the tgt in the given credentials cache.
- Orignally by remus@snapserver.com
-
- The impersonate_principal is the principal
-
- The self_service, should be the local service (for S4U2Self if
- impersonate_principal is given).
-
- The target_service defaults to the krbtgt if NULL, but could be
- kpasswd/realm or a remote service (for S4U2Proxy)
-
-*/
-krb5_error_code kerberos_kinit_s4u2_cc(krb5_context ctx,
- krb5_ccache store_cc,
- krb5_principal init_principal,
- const char *init_password,
- krb5_principal impersonate_principal,
- const char *self_service,
- const char *target_service,
- krb5_get_init_creds_opt *krb_options,
- time_t *expire_time,
- time_t *kdc_time)
+/**
+ * @brief Simulate a kinit by putting the tgt in the given credential cache.
+ *
+ * @param[in] ctx The library context
+ *
+ * @param[in] cc The credential cache to store the tgt in.
+ *
+ * @param[in] principal The initial client princial.
+ *
+ * @param[in] password The password (or NULL).
+ *
+ * @param[in] impersonate_principal The impersonatiion principal (or NULL).
+ *
+ * @param[in] self_service The local service for S4U2Self if
+ * impersonate_principal is specified).
+ *
+ * @param[in] target_service The service name of the initial credentials
+ * (kpasswd/REALM or a remote service). It defaults
+ * to the krbtgt if NULL.
+ *
+ * @param[in] krb_options Initial credential options.
+ *
+ * @param[in] expire_time A pointer to store the experation time of the
+ * credentials (or NULL).
+ *
+ * @param[in] kdc_time A pointer to store the time when the ticket becomes
+ * valid (or NULL).
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
+ krb5_ccache store_cc,
+ krb5_principal init_principal,
+ const char *init_password,
+ krb5_principal impersonate_principal,
+ const char *self_service,
+ const char *target_service,
+ krb5_get_init_creds_opt *krb_options,
+ time_t *expire_time,
+ time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_get_creds_opt options;
krb5_principal target_princ;
krb5_ccache tmp_cc;
const char *self_realm;
+ const char *client_realm = NULL;
krb5_principal blacklist_principal = NULL;
krb5_principal whitelist_principal = NULL;
if (code != 0) {
ip = NULL;
}
- DEBUG(1, ("kerberos_kinit_password_cc: "
+ DEBUG(1, ("smb_krb5_kinit_password_cache: "
"KDC returned self principal[%s] while impersonating [%s]\n",
sp?sp:"<no memory>",
ip?ip:"<no memory>"));
if (code != 0) {
ep = NULL;
}
- DEBUG(1, ("kerberos_kinit_password_cc: "
+ DEBUG(1, ("smb_krb5_kinit_password_cache: "
"KDC returned wrong principal[%s] we expected [%s]\n",
sp?sp:"<no memory>",
ep?ep:"<no memory>"));
return code;
}
+ client_realm = krb5_principal_get_realm(ctx, store_creds.client);
+ if (client_realm != NULL) {
+ /*
+ * Because the CANON flag doesn't have any impact
+ * on the impersonate_principal => store_creds.client
+ * realm mapping. We need to store the credentials twice,
+ * once with the returned realm and once with the
+ * realm of impersonate_principal.
+ */
+ code = krb5_principal_set_realm(ctx, store_creds.server,
+ client_realm);
+ if (code != 0) {
+ krb5_free_cred_contents(ctx, &store_creds);
+ return code;
+ }
+
+ code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
+ if (code != 0) {
+ krb5_free_cred_contents(ctx, &store_creds);
+ return code;
+ }
+ }
+
if (expire_time) {
*expire_time = (time_t) store_creds.times.endtime;
}
#endif
#if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
+/**
+ * @brief Create a principal name using a variable argument list.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[inout] principal A pointer to the principal structure.
+ *
+ * @param[in] _realm The realm to use. If NULL then the function will
+ * get the default realm name.
+ *
+ * @param[in] ... A list of 'char *' components, ending with NULL.
+ *
+ * Use krb5_free_principal() to free the principal when it is no longer needed.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
krb5_error_code smb_krb5_make_principal(krb5_context context,
krb5_principal *principal,
const char *_realm, ...)
va_list ap;
if (_realm) {
- realm = _realm;
+ realm = discard_const_p(char, _realm);
free_realm = false;
} else {
code = krb5_get_default_realm(context, &realm);
}
#endif
+/**
+ * @brief Compute a checksum operating on a keyblock.
+ *
+ * This function computes a checksum over a PAC using the keyblock for a keyed
+ * checksum.
+ *
+ * @param[in] mem_ctx A talloc context to alocate the signature on.
+ *
+ * @param[in] pac_data The PAC as input.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] keyblock Encryption key for a keyed checksum.
+ *
+ * @param[out] sig_type The checksum type
+ *
+ * @param[out] sig_blob The talloc'ed checksum
+ *
+ * The caller must free the sig_blob with talloc_free() when it is not needed
+ * anymore.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
DATA_BLOB *pac_data,
krb5_context context,
}
-/*
- * smb_krb5_principal_get_realm
- *
+/**
* @brief Get realm of a principal
*
- * @param[in] context The krb5_context
- * @param[in] principal The principal
- * @return pointer to the realm
+ * @param[in] context The library context
*
- * Caller must free if the return value is not NULL.
+ * @param[in] principal The principal to get the realm from.
*
+ * @return An allocated string with the realm or NULL if an error occured.
+ *
+ * The caller must free the realm string with free() if not needed anymore.
*/
-
char *smb_krb5_principal_get_realm(krb5_context context,
krb5_const_principal principal)
{
return strdup(discard_const_p(char, krb5_principal_get_realm(context, principal)));
#elif defined(krb5_princ_realm) /* MIT */
krb5_data *realm;
- realm = krb5_princ_realm(context, principal);
+ realm = discard_const_p(krb5_data,
+ krb5_princ_realm(context, principal));
return strndup(realm->data, realm->length);
#else
#error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
#endif
}
-/*
- * smb_krb5_principal_set_realm
- *
+/**
* @brief Get realm of a principal
*
- * @param[in] context The krb5_context
- * @param[in] principal The principal
- * @param[in] realm The realm
- * @return 0 on success, a krb5_error_code on error.
+ * @param[in] context The library context
+ *
+ * @param[in] principal The principal to set the realm
*
+ * @param[in] realm The realm as a string to set.
+ *
+ * @retur 0 on success, a Kerberos error code otherwise.
*/
-
krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
krb5_principal principal,
const char *realm)
old_data = krb5_princ_realm(context, principal);
- ret = krb5_copy_data_contents(&data,
- realm,
- strlen(realm));
+ ret = smb_krb5_copy_data_contents(&data,
+ realm,
+ strlen(realm));
if (ret) {
return ret;
}
"Trying to read krb5 cache: %s\n",
krb5_cc_default_name(ctx)));
if (krb5_cc_default(ctx, &cc)) {
- DEBUG(0,("kerberos_get_default_realm_from_ccache: "
+ DEBUG(5,("kerberos_get_default_realm_from_ccache: "
"failed to read default cache\n"));
goto out;
}
if (krb5_cc_get_principal(ctx, cc, &princ)) {
- DEBUG(0,("kerberos_get_default_realm_from_ccache: "
+ DEBUG(5,("kerberos_get_default_realm_from_ccache: "
"failed to get default principal\n"));
goto out;
}
return realm;
}
-char *kerberos_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
+/**
+ * @brief Get the principal as a string from the service hostname.
+ *
+ * @param[in] mem_ctx The talloc context
+ *
+ * @param[in] service The service name
+ *
+ * @param[in] remote_name The remote name
+ *
+ * @param[in] default_realm The default_realm if we cannot get it from the
+ * hostname or netbios name.
+ *
+ * @return A talloc'ed principal string or NULL if an error occured.
+ *
+ * The caller needs to free the principal with talloc_free() if it isn't needed
+ * anymore.
+ */
+char *smb_krb5_get_principal_from_service_hostname(TALLOC_CTX *mem_ctx,
const char *service,
const char *remote_name,
const char *default_realm)
if (!realm) {
return NULL;
}
- DEBUG(3,("kerberos_get_principal_from_service_hostname: "
- "cannot get realm from, "
+ DEBUG(3,("Cannot get realm from, "
"desthost %s or default ccache. Using default "
"smb.conf realm %s\n",
remote_name,
return principal;
}
+/**
+ * @brief Get an error string from a Kerberos error code.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] code The Kerberos error code.
+ *
+ * @param[in] mem_ctx The talloc context to allocate the error string on.
+ *
+ * @return A talloc'ed error string or NULL if an error occured.
+ *
+ * The caller must free the returned error string with talloc_free() if not
+ * needed anymore
+ */
char *smb_get_krb5_error_message(krb5_context context,
krb5_error_code code,
TALLOC_CTX *mem_ctx)
/**
-* @brief Return the kerberos library setting for "libdefaults:allow_weak_crypto"
-*
-* @param context The krb5_context
-*
-* @return krb5_boolean
-*
-* Function returns true if weak crypto is allowd, false if not
-*/
-
+ * @brief Return the kerberos library setting for: libdefaults:allow_weak_crypto
+ *
+ * @param[in] context The library context
+ *
+ * @return True if weak crypto is allowed, false if not.
+ */
krb5_boolean smb_krb5_get_allowed_weak_crypto(krb5_context context)
#if defined(HAVE_KRB5_CONFIG_GET_BOOL_DEFAULT)
{
#endif
/**
-* @brief Return the type of a krb5_principal
-*
-* @param context The krb5_context
-* @param principal The const krb5_principal
-*
-* @return integer type of the principal
-*/
+ * @brief Return the type of a krb5_principal
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] principal The principal to get the type from.
+ *
+ * @return The integer type of the principal.
+ */
int smb_krb5_principal_get_type(krb5_context context,
krb5_const_principal principal)
{
}
/**
-* @brief Set the type of a krb5_principal
-*
-* @param context The krb5_context
-* @param principal The const krb5_principal
-* @param type The principal type
-*
-*/
+ * @brief Set the type of a principal
+ *
+ * @param[in] context The library context
+ *
+ * @param[inout] principal The principal to set the type for.
+ *
+ * @param[in] type The principal type to set.
+ */
void smb_krb5_principal_set_type(krb5_context context,
krb5_principal principal,
int type)
#endif
}
-/**
-* @brief Generate a krb5 warning, forwarding to com_err
-*
-* @param context The krb5_context
-* @param fmt The message format
-* @param ... The message arguments
-*
-* @return
-*/
#if !defined(HAVE_KRB5_WARNX)
+/**
+ * @brief Log a Kerberos message
+ *
+ * It sends the message to com_err.
+ *
+ * @param[in] context The library context
+ *
+ * @param[in] fmt The message format
+ *
+ * @param[in] ... The message arguments
+ *
+ * @return 0 on success.
+ */
krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
- com_err_va("kdb_samba", errno, fmt, args);
+ com_err_va("samba-kdc", errno, fmt, args);
va_end(args);
return 0;
}
#endif
+/**
+ * @brief Copy a credential cache.
+ *
+ * @param[in] context The library context.
+ *
+ * @param[in] incc Credential cache to be copied.
+ *
+ * @param[inout] outcc Copy of credential cache to be filled in.
+ *
+ * @return 0 on success, a Kerberos error code otherwise.
+ */
+krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
+ krb5_ccache incc, krb5_ccache outcc)
+{
+#ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
+ return krb5_cc_copy_cache(context, incc, outcc);
+#elif defined(HAVE_KRB5_CC_COPY_CREDS)
+ krb5_error_code ret;
+ krb5_principal princ = NULL;
+
+ ret = krb5_cc_get_principal(context, incc, &princ);
+ if (ret != 0) {
+ return ret;
+ }
+ ret = krb5_cc_initialize(context, outcc, princ);
+ krb5_free_principal(context, princ);
+ if (ret != 0) {
+ return ret;
+ }
+ return krb5_cc_copy_creds(context, incc, outcc);
+#else
+#error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
+#endif
+}
+
+/**********************************************************
+ * ADS KRB5 CALLS
+ **********************************************************/
+
+static bool ads_cleanup_expired_creds(krb5_context context,
+ krb5_ccache ccache,
+ krb5_creds *credsp)
+{
+ krb5_error_code retval;
+ const char *cc_type = krb5_cc_get_type(context, ccache);
+
+ DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
+ cc_type, krb5_cc_get_name(context, ccache),
+ http_timestring(talloc_tos(), credsp->times.endtime)));
+
+ /* we will probably need new tickets if the current ones
+ will expire within 10 seconds.
+ */
+ if (credsp->times.endtime >= (time(NULL) + 10))
+ return false;
+
+ /* heimdal won't remove creds from a file ccache, and
+ perhaps we shouldn't anyway, since internally we
+ use memory ccaches, and a FILE one probably means that
+ we're using creds obtained outside of our exectuable
+ */
+ if (strequal(cc_type, "FILE")) {
+ DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
+ return false;
+ }
+
+ retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
+ if (retval) {
+ DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
+ error_message(retval)));
+ /* If we have an error in this, we want to display it,
+ but continue as though we deleted it */
+ }
+ return true;
+}
+
+/* Allocate and setup the auth context into the state we need. */
+
+static krb5_error_code ads_setup_auth_context(krb5_context context,
+ krb5_auth_context *auth_context)
+{
+ krb5_error_code retval;
+
+ retval = krb5_auth_con_init(context, auth_context );
+ if (retval) {
+ DEBUG(1,("krb5_auth_con_init failed (%s)\n",
+ error_message(retval)));
+ return retval;
+ }
+
+ /* Ensure this is an addressless ticket. */
+ retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
+ if (retval) {
+ DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
+ error_message(retval)));
+ }
+
+ return retval;
+}
+
+#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
+static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
+ uint32_t gss_flags)
+{
+ unsigned int orig_length = in_data->length;
+ unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
+ char *gss_cksum = NULL;
+
+ if (orig_length) {
+ /* Extra length field for delgated ticket. */
+ base_cksum_size += 4;
+ }
+
+ if ((unsigned int)base_cksum_size + orig_length <
+ (unsigned int)base_cksum_size) {
+ return EINVAL;
+ }
+
+ gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
+ if (gss_cksum == NULL) {
+ return ENOMEM;
+ }
+
+ memset(gss_cksum, '\0', base_cksum_size + orig_length);
+ SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
+
+ /*
+ * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
+ * This matches the behavior of heimdal and mit.
+ *
+ * And it is needed to work against some closed source
+ * SMB servers.
+ *
+ * See bug #7883
+ */
+ memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
+
+ SIVAL(gss_cksum, 20, gss_flags);
+
+ if (orig_length) {
+ SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
+ SSVAL(gss_cksum, 26, orig_length);
+ /* Copy the kerberos KRB_CRED data */
+ memcpy(gss_cksum + 28, in_data->data, orig_length);
+ free(in_data->data);
+ in_data->data = NULL;
+ in_data->length = 0;
+ }
+ in_data->data = gss_cksum;
+ in_data->length = base_cksum_size + orig_length;
+ return 0;
+}
+#endif
+
+/*
+ * We can't use krb5_mk_req because w2k wants the service to be in a particular
+ * format.
+ */
+static krb5_error_code ads_krb5_mk_req(krb5_context context,
+ krb5_auth_context *auth_context,
+ const krb5_flags ap_req_options,
+ const char *principal,
+ krb5_ccache ccache,
+ krb5_data *outbuf,
+ time_t *expire_time,
+ const char *impersonate_princ_s)
+{
+ krb5_error_code retval;
+ krb5_principal server;
+ krb5_principal impersonate_princ = NULL;
+ krb5_creds *credsp;
+ krb5_creds creds;
+ krb5_data in_data;
+ bool creds_ready = false;
+ int i = 0, maxtries = 3;
+ bool ok;
+
+ ZERO_STRUCT(in_data);
+
+ retval = smb_krb5_parse_name(context, principal, &server);
+ if (retval != 0) {
+ DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
+ return retval;
+ }
+
+ if (impersonate_princ_s) {
+ retval = smb_krb5_parse_name(context, impersonate_princ_s,
+ &impersonate_princ);
+ if (retval) {
+ DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
+ goto cleanup_princ;
+ }
+ }
+
+ /* obtain ticket & session key */
+ ZERO_STRUCT(creds);
+ if ((retval = krb5_copy_principal(context, server, &creds.server))) {
+ DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
+ error_message(retval)));
+ goto cleanup_princ;
+ }
+
+ retval = krb5_cc_get_principal(context, ccache, &creds.client);
+ if (retval != 0) {
+ /* This can commonly fail on smbd startup with no ticket in the cache.
+ * Report at higher level than 1. */
+ DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
+ error_message(retval)));
+ goto cleanup_creds;
+ }
+
+ while (!creds_ready && (i < maxtries)) {
+
+ retval = smb_krb5_get_credentials(context,
+ ccache,
+ creds.client,
+ creds.server,
+ impersonate_princ,
+ &credsp);
+ if (retval != 0) {
+ DBG_WARNING("smb_krb5_get_credentials failed for %s "
+ "(%s)\n",
+ principal,
+ error_message(retval));
+ goto cleanup_creds;
+ }
+
+ /* cope with ticket being in the future due to clock skew */
+ if ((unsigned)credsp->times.starttime > time(NULL)) {
+ time_t t = time(NULL);
+ int time_offset =(int)((unsigned)credsp->times.starttime-t);
+ DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
+ krb5_set_real_time(context, t + time_offset + 1, 0);
+ }
+
+ ok = ads_cleanup_expired_creds(context, ccache, credsp);
+ if (!ok) {
+ creds_ready = true;
+ }
+
+ i++;
+ }
+
+ DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
+ principal,
+ krb5_cc_get_type(context, ccache),
+ krb5_cc_get_name(context, ccache),
+ http_timestring(talloc_tos(),
+ (unsigned)credsp->times.endtime),
+ (unsigned)credsp->times.endtime);
+
+ if (expire_time) {
+ *expire_time = (time_t)credsp->times.endtime;
+ }
+
+ /* Allocate the auth_context. */
+ retval = ads_setup_auth_context(context, auth_context);
+ if (retval != 0) {
+ DBG_WARNING("ads_setup_auth_context failed (%s)\n",
+ error_message(retval));
+ goto cleanup_creds;
+ }
+
+#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
+ {
+ uint32_t gss_flags = 0;
+
+ if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
+ /*
+ * Fetch a forwarded TGT from the KDC so that we can
+ * hand off a 2nd ticket as part of the kerberos
+ * exchange.
+ */
+
+ DBG_INFO("Server marked as OK to delegate to, building "
+ "forwardable TGT\n");
+
+ retval = krb5_auth_con_setuseruserkey(context,
+ *auth_context,
+ &credsp->keyblock );
+ if (retval != 0) {
+ DBG_WARNING("krb5_auth_con_setuseruserkey "
+ "failed (%s)\n",
+ error_message(retval));
+ goto cleanup_creds;
+ }
+
+ /* Must use a subkey for forwarded tickets. */
+ retval = krb5_auth_con_setflags(context,
+ *auth_context,
+ KRB5_AUTH_CONTEXT_USE_SUBKEY);
+ if (retval != 0) {
+ DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
+ error_message(retval));
+ goto cleanup_creds;
+ }
+
+ retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
+ *auth_context, /* Authentication context [in] */
+ discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
+ credsp->client, /* Client principal for the tgt [in] */
+ credsp->server, /* Server principal for the tgt [in] */
+ ccache, /* Credential cache to use for storage [in] */
+ 1, /* Turn on for "Forwardable ticket" [in] */
+ &in_data ); /* Resulting response [out] */
+
+ if (retval) {
+ DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
+ error_message(retval));
+
+ /*
+ * This is not fatal. Delete the *auth_context and continue
+ * with krb5_mk_req_extended to get a non-forwardable ticket.
+ */
+
+ if (in_data.data) {
+ free( in_data.data );
+ in_data.data = NULL;
+ in_data.length = 0;
+ }
+ krb5_auth_con_free(context, *auth_context);
+ *auth_context = NULL;
+ retval = ads_setup_auth_context(context, auth_context);
+ if (retval != 0) {
+ DBG_WARNING("ads_setup_auth_context failed (%s)\n",
+ error_message(retval));
+ goto cleanup_creds;
+ }
+ } else {
+ /* We got a delegated ticket. */
+ gss_flags |= GSS_C_DELEG_FLAG;
+ }
+ }
+
+ /* Frees and reallocates in_data into a GSS checksum blob. */
+ retval = ads_create_gss_checksum(&in_data, gss_flags);
+ if (retval != 0) {
+ goto cleanup_data;
+ }
+
+ /* We always want GSS-checksum types. */
+ retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
+ if (retval != 0) {
+ DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
+ error_message(retval)));
+ goto cleanup_data;
+ }
+ }
+#endif
+
+ retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
+ &in_data, credsp, outbuf);
+ if (retval != 0) {
+ DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
+ error_message(retval));
+ }
+
+#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
+cleanup_data:
+#endif
+
+ if (in_data.data) {
+ free( in_data.data );
+ in_data.length = 0;
+ }
+
+ krb5_free_creds(context, credsp);
+
+cleanup_creds:
+ krb5_free_cred_contents(context, &creds);
+
+cleanup_princ:
+ krb5_free_principal(context, server);
+ if (impersonate_princ) {
+ krb5_free_principal(context, impersonate_princ);
+ }
+
+ return retval;
+}
+
+/*
+ get a kerberos5 ticket for the given service
+*/
+int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
+ const char *principal,
+ time_t time_offset,
+ DATA_BLOB *ticket,
+ DATA_BLOB *session_key_krb5,
+ uint32_t extra_ap_opts, const char *ccname,
+ time_t *tgs_expire,
+ const char *impersonate_princ_s)
+{
+ krb5_error_code retval;
+ krb5_data packet;
+ krb5_context context = NULL;
+ krb5_ccache ccdef = NULL;
+ krb5_auth_context auth_context = NULL;
+ krb5_enctype enc_types[] = {
+#ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
+ ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+#endif
+#ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
+ ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+#endif
+ ENCTYPE_ARCFOUR_HMAC,
+ ENCTYPE_DES_CBC_MD5,
+ ENCTYPE_DES_CBC_CRC,
+ ENCTYPE_NULL};
+ bool ok;
+
+ initialize_krb5_error_table();
+ retval = krb5_init_context(&context);
+ if (retval != 0) {
+ DBG_WARNING("krb5_init_context failed (%s)\n",
+ error_message(retval));
+ goto failed;
+ }
+
+ if (time_offset != 0) {
+ krb5_set_real_time(context, time(NULL) + time_offset, 0);
+ }
+
+ retval = krb5_cc_resolve(context,
+ ccname ? ccname : krb5_cc_default_name(context),
+ &ccdef);
+ if (retval != 0) {
+ DBG_WARNING("krb5_cc_default failed (%s)\n",
+ error_message(retval));
+ goto failed;
+ }
+
+ retval = krb5_set_default_tgs_ktypes(context, enc_types);
+ if (retval != 0) {
+ DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
+ error_message(retval));
+ goto failed;
+ }
+
+ retval = ads_krb5_mk_req(context,
+ &auth_context,
+ AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
+ principal,
+ ccdef,
+ &packet,
+ tgs_expire,
+ impersonate_princ_s);
+ if (retval != 0) {
+ goto failed;
+ }
+
+ ok = smb_krb5_get_smb_session_key(mem_ctx,
+ context,
+ auth_context,
+ session_key_krb5,
+ false);
+ if (!ok) {
+ retval = ENOMEM;
+ goto failed;
+ }
+
+ *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
+
+ smb_krb5_free_data_contents(context, &packet);
+
+failed:
+
+ if (context) {
+ if (ccdef) {
+ krb5_cc_close(context, ccdef);
+ }
+ if (auth_context) {
+ krb5_auth_con_free(context, auth_context);
+ }
+ krb5_free_context(context);
+ }
+
+ return retval;
+}
+
#else /* HAVE_KRB5 */
- /* this saves a few linking headaches */
- int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
- const char *principal, time_t time_offset,
- DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
- uint32_t extra_ap_opts,
- const char *ccname, time_t *tgs_expire,
- const char *impersonate_princ_s)
+/* This saves a few linking headaches */
+int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
+ const char *principal,
+ time_t time_offset,
+ DATA_BLOB *ticket,
+ DATA_BLOB *session_key_krb5,
+ uint32_t extra_ap_opts, const char *ccname,
+ time_t *tgs_expire,
+ const char *impersonate_princ_s)
{
DEBUG(0,("NO KERBEROS SUPPORT\n"));
return 1;
git.samba.org / samba.git / blobdiff