This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/kerberos.h"
-#include "system/time.h"
-#include "system/network.h"
#include "auth/kerberos/kerberos.h"
-#include "auth/auth.h"
+#include "auth/credentials/credentials.h"
+#include "auth/credentials/credentials_proto.h"
+#include "auth/credentials/credentials_krb5.h"
+#include "auth/kerberos/kerberos_credentials.h"
+#include "ldb.h"
+#include "param/secrets.h"
struct principal_container {
struct smb_krb5_context *smb_krb5_context;
krb5_principal principal;
+ const char *string_form; /* Optional */
};
-static int free_principal(void *ptr) {
- struct principal_container *pc = ptr;
+static krb5_error_code free_principal(struct principal_container *pc)
+{
/* current heimdal - 0.6.3, which we need anyway, fixes segfaults here */
krb5_free_principal(pc->smb_krb5_context->krb5_context, pc->principal);
return 0;
}
-krb5_error_code salt_principal_from_credentials(TALLOC_CTX *parent_ctx,
- struct cli_credentials *machine_account,
- struct smb_krb5_context *smb_krb5_context,
- krb5_principal *salt_princ)
+
+static krb5_error_code parse_principal(TALLOC_CTX *parent_ctx,
+ const char *princ_string,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_principal *princ,
+ const char **error_string)
{
- krb5_error_code ret;
- char *machine_username;
- char *salt_body;
- char *lower_realm;
- struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
+ int ret;
+ struct principal_container *mem_ctx;
+ if (princ_string == NULL) {
+ *princ = NULL;
+ return 0;
+ }
+
+ ret = krb5_parse_name(smb_krb5_context->krb5_context,
+ princ_string, princ);
+
+ if (ret) {
+ (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
+ return ret;
+ }
+
+ mem_ctx = talloc(parent_ctx, struct principal_container);
if (!mem_ctx) {
+ (*error_string) = error_message(ENOMEM);
return ENOMEM;
}
-
- machine_username = talloc_strdup(mem_ctx, cli_credentials_get_username(machine_account));
- if (!machine_username) {
- talloc_free(mem_ctx);
+ /* This song-and-dance effectivly puts the principal
+ * into talloc, so we can't loose it. */
+ mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
+ mem_ctx->principal = *princ;
+ talloc_set_destructor(mem_ctx, free_principal);
+ return 0;
+}
+
+static krb5_error_code principals_from_msg(TALLOC_CTX *parent_ctx,
+ struct ldb_message *msg,
+ struct smb_krb5_context *smb_krb5_context,
+ struct principal_container ***principals_out,
+ const char **error_string)
+{
+ unsigned int i;
+ krb5_error_code ret;
+ char *upper_realm;
+ const char *realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
+ const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
+ struct ldb_message_element *spn_el = ldb_msg_find_element(msg, "servicePrincipalName");
+ TALLOC_CTX *tmp_ctx;
+ struct principal_container **principals;
+ tmp_ctx = talloc_new(parent_ctx);
+ if (!tmp_ctx) {
+ *error_string = "Cannot allocate tmp_ctx";
return ENOMEM;
}
- if (machine_username[strlen(machine_username)-1] == '$') {
- machine_username[strlen(machine_username)-1] = '\0';
+ if (!realm) {
+ *error_string = "Cannot have a kerberos secret in secrets.ldb without a realm";
+ return EINVAL;
}
- lower_realm = strlower_talloc(mem_ctx, cli_credentials_get_realm(machine_account));
- if (!lower_realm) {
- talloc_free(mem_ctx);
+
+ upper_realm = strupper_talloc(tmp_ctx, realm);
+ if (!upper_realm) {
+ talloc_free(tmp_ctx);
+ *error_string = "Cannot allocate full upper case realm";
return ENOMEM;
}
- salt_body = talloc_asprintf(mem_ctx, "%s.%s", machine_username,
- lower_realm);
- if (!salt_body) {
- talloc_free(mem_ctx);
- return ENOMEM;
+ principals = talloc_array(tmp_ctx, struct principal_container *, spn_el ? (spn_el->num_values + 2) : 2);
+
+ spn_el = ldb_msg_find_element(msg, "servicePrincipalName");
+ for (i=0; spn_el && i < spn_el->num_values; i++) {
+ principals[i] = talloc(principals, struct principal_container);
+ if (!principals[i]) {
+ talloc_free(tmp_ctx);
+ *error_string = "Cannot allocate mem_ctx";
+ return ENOMEM;
+ }
+
+ principals[i]->smb_krb5_context = talloc_reference(principals[i], smb_krb5_context);
+ principals[i]->string_form = talloc_asprintf(principals[i], "%*.*s@%s",
+ (int)spn_el->values[i].length,
+ (int)spn_el->values[i].length,
+ (const char *)spn_el->values[i].data, upper_realm);
+ if (!principals[i]->string_form) {
+ talloc_free(tmp_ctx);
+ *error_string = "Cannot allocate full samAccountName";
+ return ENOMEM;
+ }
+
+ ret = krb5_parse_name(smb_krb5_context->krb5_context,
+ principals[i]->string_form, &principals[i]->principal);
+
+ if (ret) {
+ talloc_free(tmp_ctx);
+ (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
+ return ret;
+ }
+
+ /* This song-and-dance effectivly puts the principal
+ * into talloc, so we can't loose it. */
+ talloc_set_destructor(principals[i], free_principal);
}
-
- ret = krb5_make_principal(smb_krb5_context->krb5_context, salt_princ,
- cli_credentials_get_realm(machine_account),
- "host", salt_body, NULL);
- if (ret == 0) {
- mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
- mem_ctx->principal = *salt_princ;
- talloc_set_destructor(mem_ctx, free_principal);
+ if (samAccountName) {
+ principals[i] = talloc(principals, struct principal_container);
+ if (!principals[i]) {
+ talloc_free(tmp_ctx);
+ *error_string = "Cannot allocate mem_ctx";
+ return ENOMEM;
+ }
+
+ principals[i]->smb_krb5_context = talloc_reference(principals[i], smb_krb5_context);
+ principals[i]->string_form = talloc_asprintf(parent_ctx, "%s@%s", samAccountName, upper_realm);
+ if (!principals[i]->string_form) {
+ talloc_free(tmp_ctx);
+ *error_string = "Cannot allocate full samAccountName";
+ return ENOMEM;
+ }
+
+ ret = krb5_make_principal(smb_krb5_context->krb5_context, &principals[i]->principal, upper_realm, samAccountName,
+ NULL);
+ if (ret) {
+ talloc_free(tmp_ctx);
+ (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
+ return ret;
+ }
+
+ /* This song-and-dance effectivly puts the principal
+ * into talloc, so we can't loose it. */
+ talloc_set_destructor(principals[i], free_principal);
+ i++;
}
+
+ principals[i] = NULL;
+ *principals_out = talloc_steal(parent_ctx, principals);
+
+ talloc_free(tmp_ctx);
return ret;
}
+static krb5_error_code salt_principal_from_msg(TALLOC_CTX *parent_ctx,
+ struct ldb_message *msg,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_principal *salt_princ,
+ const char **error_string)
+{
+ const char *salt_principal = ldb_msg_find_attr_as_string(msg, "saltPrincipal", NULL);
+ const char *samAccountName = ldb_msg_find_attr_as_string(msg, "samAccountName", NULL);
+ const char *realm = ldb_msg_find_attr_as_string(msg, "realm", NULL);
+ if (salt_principal) {
+ return parse_principal(parent_ctx, salt_principal, smb_krb5_context, salt_princ, error_string);
+ } else if (samAccountName) {
+ krb5_error_code ret;
+ char *machine_username;
+ char *salt_body;
+ char *lower_realm;
+ char *upper_realm;
+
+ TALLOC_CTX *tmp_ctx;
+ struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
+ if (!mem_ctx) {
+ *error_string = "Cannot allocate mem_ctx";
+ return ENOMEM;
+ }
+
+ tmp_ctx = talloc_new(mem_ctx);
+ if (!tmp_ctx) {
+ talloc_free(mem_ctx);
+ *error_string = "Cannot allocate tmp_ctx";
+ return ENOMEM;
+ }
+
+ if (!realm) {
+ *error_string = "Cannot have a kerberos secret in secrets.ldb without a realm";
+ return EINVAL;
+ }
+
+ machine_username = talloc_strdup(tmp_ctx, samAccountName);
+ if (!machine_username) {
+ talloc_free(mem_ctx);
+ *error_string = "Cannot duplicate samAccountName";
+ return ENOMEM;
+ }
+
+ if (machine_username[strlen(machine_username)-1] == '$') {
+ machine_username[strlen(machine_username)-1] = '\0';
+ }
+
+ lower_realm = strlower_talloc(tmp_ctx, realm);
+ if (!lower_realm) {
+ talloc_free(mem_ctx);
+ *error_string = "Cannot allocate to lower case realm";
+ return ENOMEM;
+ }
+
+ upper_realm = strupper_talloc(tmp_ctx, realm);
+ if (!upper_realm) {
+ talloc_free(mem_ctx);
+ *error_string = "Cannot allocate to upper case realm";
+ return ENOMEM;
+ }
+
+ salt_body = talloc_asprintf(tmp_ctx, "%s.%s", machine_username,
+ lower_realm);
+ talloc_free(lower_realm);
+ talloc_free(machine_username);
+ if (!salt_body) {
+ talloc_free(mem_ctx);
+ *error_string = "Cannot form salt principal body";
+ return ENOMEM;
+ }
+
+ ret = krb5_make_principal(smb_krb5_context->krb5_context, salt_princ,
+ upper_realm,
+ "host", salt_body, NULL);
+ if (ret == 0) {
+ /* This song-and-dance effectivly puts the principal
+ * into talloc, so we can't loose it. */
+ mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
+ mem_ctx->principal = *salt_princ;
+ talloc_set_destructor(mem_ctx, free_principal);
+ } else {
+ (*error_string) = smb_get_krb5_error_message(smb_krb5_context->krb5_context, ret, parent_ctx);
+ }
+ talloc_free(tmp_ctx);
+ return ret;
+ } else {
+ (*error_string) = "Cannot determine salt principal, no saltPrincipal or samAccountName specified";
+ return EINVAL;
+ }
+}
+
+/* Obtain the principal set on this context. Requires a
+ * smb_krb5_context because we are doing krb5 principal parsing with
+ * the library routines. The returned princ is placed in the talloc
+ * system by means of a destructor (do *not* free). */
+
krb5_error_code principal_from_credentials(TALLOC_CTX *parent_ctx,
- struct cli_credentials *credentials,
- struct smb_krb5_context *smb_krb5_context,
- krb5_principal *princ)
+ struct cli_credentials *credentials,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_principal *princ,
+ enum credentials_obtained *obtained,
+ const char **error_string)
{
krb5_error_code ret;
const char *princ_string;
- struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
+ TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
if (!mem_ctx) {
+ (*error_string) = error_message(ENOMEM);
return ENOMEM;
}
-
- princ_string = cli_credentials_get_principal(credentials, mem_ctx);
-
+ princ_string = cli_credentials_get_principal_and_obtained(credentials, mem_ctx, obtained);
if (!princ_string) {
- talloc_free(mem_ctx);
- princ = NULL;
- return 0;
+ (*error_string) = error_message(ENOMEM);
+ return ENOMEM;
}
- ret = krb5_parse_name(smb_krb5_context->krb5_context,
- princ_string, princ);
-
- if (ret == 0) {
- mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
- mem_ctx->principal = *princ;
- talloc_set_destructor(mem_ctx, free_principal);
- }
+ ret = parse_principal(parent_ctx, princ_string,
+ smb_krb5_context, princ, error_string);
+ talloc_free(mem_ctx);
return ret;
}
+/* Obtain the principal set on this context. Requires a
+ * smb_krb5_context because we are doing krb5 principal parsing with
+ * the library routines. The returned princ is placed in the talloc
+ * system by means of a destructor (do *not* free). */
+
+ krb5_error_code impersonate_principal_from_credentials(TALLOC_CTX *parent_ctx,
+ struct cli_credentials *credentials,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_principal *princ,
+ const char **error_string)
+{
+ return parse_principal(parent_ctx, cli_credentials_get_impersonate_principal(credentials),
+ smb_krb5_context, princ, error_string);
+}
+
/**
* Return a freshly allocated ccache (destroyed by destructor on child
* of parent_ctx), for a given set of client credentials
krb5_error_code kinit_to_ccache(TALLOC_CTX *parent_ctx,
struct cli_credentials *credentials,
struct smb_krb5_context *smb_krb5_context,
- krb5_ccache ccache)
+ krb5_ccache ccache,
+ enum credentials_obtained *obtained,
+ const char **error_string)
{
krb5_error_code ret;
- const char *password;
+ const char *password, *target_service;
time_t kdc_time = 0;
krb5_principal princ;
-
+ krb5_principal impersonate_principal;
+ int tries;
TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
+ krb5_get_init_creds_opt *krb_options;
if (!mem_ctx) {
+ (*error_string) = strerror(ENOMEM);
return ENOMEM;
}
- ret = principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &princ);
+ ret = principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &princ, obtained, error_string);
+ if (ret) {
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
+ ret = impersonate_principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &impersonate_principal, error_string);
if (ret) {
talloc_free(mem_ctx);
return ret;
}
+ target_service = cli_credentials_get_target_service(credentials);
+
password = cli_credentials_get_password(credentials);
-
- if (password) {
- ret = kerberos_kinit_password_cc(smb_krb5_context->krb5_context, ccache,
- princ,
- password, NULL, &kdc_time);
- } else {
- /* No password available, try to use a keyblock instead */
- krb5_keyblock keyblock;
- const struct samr_Password *mach_pwd;
- mach_pwd = cli_credentials_get_nt_hash(credentials, mem_ctx);
- if (!mach_pwd) {
- talloc_free(mem_ctx);
- DEBUG(1, ("kinit_to_ccache: No password available for kinit\n"));
+ /* setup the krb5 options we want */
+ if ((ret = krb5_get_init_creds_opt_alloc(smb_krb5_context->krb5_context, &krb_options))) {
+ (*error_string) = talloc_asprintf(credentials, "krb5_get_init_creds_opt_alloc failed (%s)\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
+ /* get the defaults */
+ krb5_get_init_creds_opt_set_default_flags(smb_krb5_context->krb5_context, NULL, NULL, krb_options);
+
+ /* set if we want a forwardable ticket */
+ switch (cli_credentials_get_krb_forwardable(credentials)) {
+ case CRED_AUTO_KRB_FORWARDABLE:
+ break;
+ case CRED_NO_KRB_FORWARDABLE:
+ krb5_get_init_creds_opt_set_forwardable(krb_options, FALSE);
+ break;
+ case CRED_FORCE_KRB_FORWARDABLE:
+ krb5_get_init_creds_opt_set_forwardable(krb_options, TRUE);
+ break;
+ }
+
+ tries = 2;
+ while (tries--) {
+ if (password) {
+ ret = kerberos_kinit_password_cc(smb_krb5_context->krb5_context, ccache,
+ princ, password,
+ impersonate_principal, target_service,
+ krb_options,
+ NULL, &kdc_time);
+ } else if (impersonate_principal) {
+ (*error_string) = "INTERNAL error: Cannot impersonate principal with just a keyblock. A password must be specified in the credentials";
return EINVAL;
+ } else {
+ /* No password available, try to use a keyblock instead */
+
+ krb5_keyblock keyblock;
+ const struct samr_Password *mach_pwd;
+ mach_pwd = cli_credentials_get_nt_hash(credentials, mem_ctx);
+ if (!mach_pwd) {
+ talloc_free(mem_ctx);
+ (*error_string) = "kinit_to_ccache: No password available for kinit\n";
+ krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
+ return EINVAL;
+ }
+ ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
+ ENCTYPE_ARCFOUR_HMAC,
+ mach_pwd->hash, sizeof(mach_pwd->hash),
+ &keyblock);
+
+ if (ret == 0) {
+ ret = kerberos_kinit_keyblock_cc(smb_krb5_context->krb5_context, ccache,
+ princ, &keyblock,
+ target_service, krb_options,
+ NULL, &kdc_time);
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &keyblock);
+ }
}
- ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
- ENCTYPE_ARCFOUR_HMAC,
- mach_pwd->hash, sizeof(mach_pwd->hash),
- &keyblock);
-
- if (ret == 0) {
- ret = kerberos_kinit_keyblock_cc(smb_krb5_context->krb5_context, ccache,
- princ,
- &keyblock, NULL, &kdc_time);
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &keyblock);
+
+ if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
+ /* Perhaps we have been given an invalid skew, so try again without it */
+ time_t t = time(NULL);
+ krb5_set_real_time(smb_krb5_context->krb5_context, t, 0);
+ } else {
+ /* not a skew problem */
+ break;
}
}
+ krb5_get_init_creds_opt_free(smb_krb5_context->krb5_context, krb_options);
+
+ if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
+ (*error_string) = talloc_asprintf(credentials, "kinit for %s failed (%s)\n",
+ cli_credentials_get_principal(credentials, mem_ctx),
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
/* cope with ticket being in the future due to clock skew */
if ((unsigned)kdc_time > time(NULL)) {
time_t t = time(NULL);
krb5_set_real_time(smb_krb5_context->krb5_context, t + time_offset + 1, 0);
}
- if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
- DEBUG(1,("kinit for %s failed (%s)\n",
- cli_credentials_get_principal(credentials, mem_ctx),
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
+ if (ret == KRB5KDC_ERR_PREAUTH_FAILED && cli_credentials_wrong_password(credentials)) {
+ ret = kinit_to_ccache(parent_ctx,
+ credentials,
+ smb_krb5_context,
+ ccache, obtained,
+ error_string);
+ }
+
+ if (ret) {
+ (*error_string) = talloc_asprintf(credentials, "kinit for %s failed (%s)\n",
+ cli_credentials_get_principal(credentials, mem_ctx),
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
talloc_free(mem_ctx);
return ret;
- }
+ }
+ talloc_free(mem_ctx);
+ return 0;
+}
+
+static krb5_error_code free_keytab(struct keytab_container *ktc)
+{
+ return krb5_kt_close(ktc->smb_krb5_context->krb5_context, ktc->keytab);
+}
+
+krb5_error_code smb_krb5_open_keytab(TALLOC_CTX *mem_ctx,
+ struct smb_krb5_context *smb_krb5_context,
+ const char *keytab_name, struct keytab_container **ktc)
+{
+ krb5_keytab keytab;
+ krb5_error_code ret;
+ ret = krb5_kt_resolve(smb_krb5_context->krb5_context, keytab_name, &keytab);
if (ret) {
- DEBUG(1,("kinit for %s failed (%s)\n",
- cli_credentials_get_principal(credentials, mem_ctx),
+ DEBUG(1,("failed to open krb5 keytab: %s\n",
smb_get_krb5_error_message(smb_krb5_context->krb5_context,
ret, mem_ctx)));
- talloc_free(mem_ctx);
return ret;
- }
+ }
+
+ *ktc = talloc(mem_ctx, struct keytab_container);
+ if (!*ktc) {
+ return ENOMEM;
+ }
+
+ (*ktc)->smb_krb5_context = talloc_reference(*ktc, smb_krb5_context);
+ (*ktc)->keytab = keytab;
+ talloc_set_destructor(*ktc, free_keytab);
+
return 0;
}
-static int free_keytab(void *ptr) {
- struct keytab_container *ktc = ptr;
- krb5_kt_close(ktc->smb_krb5_context->krb5_context, ktc->keytab);
+static krb5_error_code keytab_add_keys(TALLOC_CTX *parent_ctx,
+ const char *princ_string,
+ krb5_principal princ,
+ krb5_principal salt_princ,
+ int kvno,
+ const char *password_s,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_enctype *enctypes,
+ krb5_keytab keytab,
+ const char **error_string)
+{
+ int i;
+ krb5_error_code ret;
+ krb5_data password;
+ TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
+ if (!mem_ctx) {
+ return ENOMEM;
+ }
+
+ password.data = discard_const_p(char *, password_s);
+ password.length = strlen(password_s);
+
+ for (i=0; enctypes[i]; i++) {
+ krb5_keytab_entry entry;
+ ret = create_kerberos_key_from_string(smb_krb5_context->krb5_context,
+ salt_princ, &password, &entry.keyblock, enctypes[i]);
+ if (ret != 0) {
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
+ entry.principal = princ;
+ entry.vno = kvno;
+ ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
+ if (ret != 0) {
+ *error_string = talloc_asprintf(parent_ctx, "Failed to add enctype %d entry for %s(kvno %d) to keytab: %s\n",
+ (int)enctypes[i],
+ princ_string,
+ kvno,
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
+ talloc_free(mem_ctx);
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
+ return ret;
+ }
+ DEBUG(5, ("Added %s(kvno %d) to keytab (enctype %d)\n",
+ princ_string, kvno,
+ (int)enctypes[i]));
+
+ krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
+ }
+ talloc_free(mem_ctx);
return 0;
}
- int create_memory_keytab(TALLOC_CTX *parent_ctx,
- struct cli_credentials *machine_account,
- struct smb_krb5_context *smb_krb5_context,
- struct keytab_container **keytab_container)
+static krb5_error_code create_keytab(TALLOC_CTX *parent_ctx,
+ struct ldb_message *msg,
+ struct principal_container **principals,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_keytab keytab,
+ bool add_old,
+ const char **error_string)
{
+ unsigned int i;
krb5_error_code ret;
const char *password_s;
- char *old_secret;
- krb5_data password;
- int i, kvno;
- krb5_enctype *enctypes;
+ const char *old_secret;
+ int kvno;
+ uint32_t enctype_bitmap;
krb5_principal salt_princ;
- krb5_principal princ;
- krb5_keytab keytab;
-
+ krb5_enctype *enctypes;
TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
if (!mem_ctx) {
+ *error_string = "unable to allocate tmp_ctx for create_keytab";
return ENOMEM;
}
-
- *keytab_container = talloc(mem_ctx, struct keytab_container);
- ret = krb5_kt_resolve(smb_krb5_context->krb5_context, "MEMORY:", &keytab);
+ /* The salt used to generate these entries may be different however, fetch that */
+ ret = salt_principal_from_msg(mem_ctx, msg,
+ smb_krb5_context,
+ &salt_princ, error_string);
if (ret) {
- DEBUG(1,("failed to generate a new krb5 keytab: %s\n",
- error_message(ret)));
talloc_free(mem_ctx);
return ret;
}
- (*keytab_container)->smb_krb5_context = talloc_reference(*keytab_container, smb_krb5_context);
- (*keytab_container)->keytab = keytab;
+ kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
- talloc_set_destructor(*keytab_container, free_keytab);
+ /* Finally, do the dance to get the password to put in the entry */
+ password_s = ldb_msg_find_attr_as_string(msg, "secret", NULL);
- ret = salt_principal_from_credentials(mem_ctx, machine_account,
- smb_krb5_context,
- &salt_princ);
- if (ret) {
- DEBUG(1,("create_memory_keytab: maksing salt principal failed (%s)\n",
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
+ if (!password_s) {
+ /* There is no password here, so nothing to do */
talloc_free(mem_ctx);
- return ret;
+ return 0;
+ }
+
+ if (add_old && kvno != 0) {
+ old_secret = ldb_msg_find_attr_as_string(msg, "priorSecret", NULL);
+ } else {
+ old_secret = NULL;
}
- ret = principal_from_credentials(mem_ctx, machine_account, smb_krb5_context, &princ);
+ enctype_bitmap = (uint32_t)ldb_msg_find_attr_as_int(msg, "msDS-SupportedEncryptionTypes", ENC_ALL_TYPES);
+
+ ret = kerberos_enctype_bitmap_to_enctypes(mem_ctx, enctype_bitmap, &enctypes);
if (ret) {
- DEBUG(1,("create_memory_keytab: maksing krb5 principal failed (%s)\n",
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
+ *error_string = talloc_asprintf(parent_ctx, "create_keytab: generating list of encryption types failed (%s)\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
talloc_free(mem_ctx);
return ret;
}
- password_s = cli_credentials_get_password(machine_account);
- if (!password_s) {
- /* If we don't have the plaintext password, try for
- * the MD4 password hash */
-
- krb5_keytab_entry entry;
- const struct samr_Password *mach_pwd;
- mach_pwd = cli_credentials_get_nt_hash(machine_account, mem_ctx);
- if (!mach_pwd) {
- talloc_free(mem_ctx);
- DEBUG(1, ("create_memory_keytab: Domain trust informaton for account %s not available\n",
- cli_credentials_get_principal(machine_account, mem_ctx)));
- return EINVAL;
- }
- ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
- ENCTYPE_ARCFOUR_HMAC,
- mach_pwd->hash, sizeof(mach_pwd->hash),
- &entry.keyblock);
+ /* Walk over the principals */
+ for (i=0; principals[i]; i++) {
+ ret = keytab_add_keys(mem_ctx, principals[i]->string_form, principals[i]->principal,
+ salt_princ,
+ kvno, password_s, smb_krb5_context,
+ enctypes, keytab, error_string);
if (ret) {
- DEBUG(1, ("create_memory_keytab: krb5_keyblock_init failed: %s\n",
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
+ talloc_free(mem_ctx);
return ret;
}
- entry.principal = princ;
- entry.vno = cli_credentials_get_kvno(machine_account);
- ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
- if (ret) {
- DEBUG(1, ("Failed to add ARCFOUR_HMAC (only) entry for %s to keytab: %s",
- cli_credentials_get_principal(machine_account, mem_ctx),
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
- talloc_free(mem_ctx);
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
- return ret;
+ if (old_secret) {
+ ret = keytab_add_keys(mem_ctx, principals[i]->string_form, principals[i]->principal,
+ salt_princ,
+ kvno - 1, old_secret, smb_krb5_context,
+ enctypes, keytab, error_string);
+ if (ret) {
+ talloc_free(mem_ctx);
+ return ret;
+ }
}
-
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
+ }
- talloc_steal(parent_ctx, *keytab_container);
- talloc_free(mem_ctx);
- return 0;
+ talloc_free(mem_ctx);
+ return ret;
+}
+
+/*
+ * Walk the keytab, looking for entries of this principal name, with KVNO other than current kvno -1.
+ *
+ * These entries are now stale, we only keep the current, and previous entries around.
+ *
+ * Inspired by the code in Samba3 for 'use kerberos keytab'.
+ *
+ */
+
+static krb5_error_code remove_old_entries(TALLOC_CTX *parent_ctx,
+ struct ldb_message *msg,
+ struct principal_container **principals,
+ bool delete_all_kvno,
+ struct smb_krb5_context *smb_krb5_context,
+ krb5_keytab keytab, bool *found_previous,
+ const char **error_string)
+{
+ krb5_error_code ret, ret2;
+ krb5_kt_cursor cursor;
+ int kvno;
+ TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
+
+ if (!mem_ctx) {
+ return ENOMEM;
}
-
- /* good, we actually have the real plaintext */
- ret = get_kerberos_allowed_etypes(smb_krb5_context->krb5_context,
- &enctypes);
- if (ret) {
- DEBUG(1,("create_memory_keytab: getting encrption types failed (%s)\n",
- error_message(ret)));
+ *found_previous = false;
+
+ kvno = ldb_msg_find_attr_as_int(msg, "msDS-KeyVersionNumber", 0);
+
+ /* for each entry in the keytab */
+ ret = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
+ switch (ret) {
+ case 0:
+ break;
+ case HEIM_ERR_OPNOTSUPP:
+ case ENOENT:
+ case KRB5_KT_END:
+ /* no point enumerating if there isn't anything here */
+ talloc_free(mem_ctx);
+ return 0;
+ default:
+ *error_string = talloc_asprintf(parent_ctx, "failed to open keytab for read of old entries: %s\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
talloc_free(mem_ctx);
return ret;
}
- password.data = discard_const_p(char *, password_s);
- password.length = strlen(password_s);
- kvno = cli_credentials_get_kvno(machine_account);
-
- for (i=0; enctypes[i]; i++) {
+ while (!ret) {
+ unsigned int i;
+ bool matched = false;
krb5_keytab_entry entry;
- ret = create_kerberos_key_from_string(smb_krb5_context->krb5_context,
- salt_princ, &password, &entry.keyblock, enctypes[i]);
+ ret = krb5_kt_next_entry(smb_krb5_context->krb5_context, keytab, &entry, &cursor);
if (ret) {
- talloc_free(mem_ctx);
- return ret;
+ break;
+ }
+ for (i = 0; principals[i]; i++) {
+ /* if it matches our principal */
+ if (krb5_kt_compare(smb_krb5_context->krb5_context, &entry, principals[i]->principal, 0, 0)) {
+ matched = true;
+ break;
+ }
}
- entry.principal = princ;
- entry.vno = kvno;
- ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
- if (ret) {
- DEBUG(1, ("Failed to add entry for %s to keytab: %s",
- cli_credentials_get_principal(machine_account, mem_ctx),
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
- talloc_free(mem_ctx);
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
- return ret;
+ if (!matched) {
+ /* Free the entry, it wasn't the one we were looking for anyway */
+ krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
+ continue;
}
-
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
- }
- old_secret = cli_credentials_get_old_password(machine_account);
- if (kvno != 0 && old_secret) {
- password.data = discard_const_p(char *, old_secret);
- password.length = strlen(old_secret);
+ /* delete it, if it is not kvno -1 */
+ if (entry.vno != (kvno - 1 )) {
+ /* Release the enumeration. We are going to
+ * have to start this from the top again,
+ * because deletes during enumeration may not
+ * always be consistant.
+ *
+ * Also, the enumeration locks a FILE: keytab
+ */
- for (i=0; enctypes[i]; i++) {
- krb5_keytab_entry entry;
- ret = create_kerberos_key_from_string(smb_krb5_context->krb5_context,
- salt_princ, &password, &entry.keyblock, enctypes[i]);
- if (ret) {
+ krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
+
+ ret = krb5_kt_remove_entry(smb_krb5_context->krb5_context, keytab, &entry);
+ krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
+
+ /* Deleted: Restart from the top */
+ ret2 = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
+ if (ret2) {
+ krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
+ DEBUG(1,("failed to restart enumeration of keytab: %s\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx)));
+
talloc_free(mem_ctx);
- return ret;
+ return ret2;
}
-
- entry.principal = princ;
- entry.vno = kvno - 1;
- ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
+
if (ret) {
- DEBUG(1, ("Failed to add 'old password' entry for %s to keytab: %s",
- cli_credentials_get_principal(machine_account, mem_ctx),
- smb_get_krb5_error_message(smb_krb5_context->krb5_context,
- ret, mem_ctx)));
- talloc_free(mem_ctx);
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
- return ret;
+ break;
}
- krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
+ } else {
+ *found_previous = true;
}
+
+ /* Free the entry, we don't need it any more */
+ krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
+
+
+ }
+ krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
+
+ switch (ret) {
+ case 0:
+ break;
+ case ENOENT:
+ case KRB5_KT_END:
+ ret = 0;
+ break;
+ default:
+ *error_string = talloc_asprintf(parent_ctx, "failed in deleting old entries for principal: %s\n",
+ smb_get_krb5_error_message(smb_krb5_context->krb5_context,
+ ret, mem_ctx));
+ }
+ talloc_free(mem_ctx);
+ return ret;
+}
+
+krb5_error_code smb_krb5_update_keytab(TALLOC_CTX *parent_ctx,
+ struct smb_krb5_context *smb_krb5_context,
+ struct ldb_context *ldb,
+ struct ldb_message *msg,
+ bool delete_all_kvno,
+ const char **error_string)
+{
+ krb5_error_code ret;
+ bool found_previous;
+ TALLOC_CTX *mem_ctx = talloc_new(NULL);
+ struct keytab_container *keytab_container;
+ struct principal_container **principals;
+ const char *keytab_name;
+
+ if (!mem_ctx) {
+ return ENOMEM;
+ }
+
+ keytab_name = keytab_name_from_msg(mem_ctx, ldb, msg);
+ if (!keytab_name) {
+ return ENOENT;
+ }
+
+ ret = smb_krb5_open_keytab(mem_ctx, smb_krb5_context, keytab_name, &keytab_container);
+
+ if (ret != 0) {
+ talloc_free(mem_ctx);
+ return ret;
}
- free_kerberos_etypes(smb_krb5_context->krb5_context, enctypes);
+ DEBUG(5, ("Opened keytab %s\n", keytab_name));
+
+ /* Get the principal we will store the new keytab entries under */
+ ret = principals_from_msg(mem_ctx, msg, smb_krb5_context, &principals, error_string);
- talloc_steal(parent_ctx, *keytab_container);
+ if (ret != 0) {
+ *error_string = talloc_asprintf(parent_ctx, "Failed to load principals from ldb message: %s\n", *error_string);
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
+ ret = remove_old_entries(mem_ctx, msg, principals, delete_all_kvno,
+ smb_krb5_context, keytab_container->keytab, &found_previous, error_string);
+ if (ret != 0) {
+ *error_string = talloc_asprintf(parent_ctx, "Failed to remove old principals from keytab: %s\n", *error_string);
+ talloc_free(mem_ctx);
+ return ret;
+ }
+
+ if (!delete_all_kvno) {
+ /* Create a new keytab. If during the cleanout we found
+ * entires for kvno -1, then don't try and duplicate them.
+ * Otherwise, add kvno, and kvno -1 */
+
+ ret = create_keytab(mem_ctx, msg, principals,
+ smb_krb5_context,
+ keytab_container->keytab,
+ found_previous ? false : true, error_string);
+ }
talloc_free(mem_ctx);
- return 0;
+ return ret;
}
+krb5_error_code smb_krb5_create_memory_keytab(TALLOC_CTX *parent_ctx,
+ struct cli_credentials *machine_account,
+ struct smb_krb5_context *smb_krb5_context,
+ struct keytab_container **keytab_container)
+{
+ krb5_error_code ret;
+ TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
+ const char *rand_string;
+ const char *keytab_name;
+ struct ldb_message *msg;
+ const char *error_string;
+ if (!mem_ctx) {
+ return ENOMEM;
+ }
+
+ *keytab_container = talloc(mem_ctx, struct keytab_container);
+
+ rand_string = generate_random_str(mem_ctx, 16);
+ if (!rand_string) {
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+
+ keytab_name = talloc_asprintf(mem_ctx, "MEMORY:%s",
+ rand_string);
+ if (!keytab_name) {
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+
+ ret = smb_krb5_open_keytab(mem_ctx, smb_krb5_context, keytab_name, keytab_container);
+ if (ret) {
+ return ret;
+ }
+ msg = ldb_msg_new(mem_ctx);
+ if (!msg) {
+ talloc_free(mem_ctx);
+ return ENOMEM;
+ }
+ ldb_msg_add_string(msg, "krb5Keytab", keytab_name);
+ ldb_msg_add_string(msg, "secret", cli_credentials_get_password(machine_account));
+ ldb_msg_add_string(msg, "samAccountName", cli_credentials_get_username(machine_account));
+ ldb_msg_add_string(msg, "realm", cli_credentials_get_realm(machine_account));
+ ldb_msg_add_fmt(msg, "msDS-KeyVersionNumber", "%d", (int)cli_credentials_get_kvno(machine_account));
+
+ ret = smb_krb5_update_keytab(mem_ctx, smb_krb5_context, NULL, msg, false, &error_string);
+ if (ret == 0) {
+ talloc_steal(parent_ctx, *keytab_container);
+ } else {
+ DEBUG(0, ("Failed to create in-memory keytab: %s\n", error_string));
+ *keytab_container = NULL;
+ }
+ talloc_free(mem_ctx);
+ return ret;
+}
+/* Translate between the IETF encryption type values and the Microsoft msDS-SupportedEncryptionTypes values */
+uint32_t kerberos_enctype_to_bitmap(krb5_enctype enc_type_enum)
+{
+ switch (enc_type_enum) {
+ case ENCTYPE_DES_CBC_CRC:
+ return ENC_CRC32;
+ case ENCTYPE_DES_CBC_MD5:
+ return ENC_RSA_MD5;
+ case ENCTYPE_ARCFOUR_HMAC_MD5:
+ return ENC_RC4_HMAC_MD5;
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ return ENC_HMAC_SHA1_96_AES128;
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return ENC_HMAC_SHA1_96_AES256;
+ default:
+ return 0;
+ }
+}
+
+/* Translate between the Microsoft msDS-SupportedEncryptionTypes values and the IETF encryption type values */
+krb5_enctype kerberos_enctype_bitmap_to_enctype(uint32_t enctype_bitmap)
+{
+ switch (enctype_bitmap) {
+ case ENC_CRC32:
+ return ENCTYPE_DES_CBC_CRC;
+ case ENC_RSA_MD5:
+ return ENCTYPE_DES_CBC_MD5;
+ case ENC_RC4_HMAC_MD5:
+ return ENCTYPE_ARCFOUR_HMAC_MD5;
+ case ENC_HMAC_SHA1_96_AES128:
+ return ENCTYPE_AES128_CTS_HMAC_SHA1_96;
+ case ENC_HMAC_SHA1_96_AES256:
+ return ENCTYPE_AES256_CTS_HMAC_SHA1_96;
+ default:
+ return 0;
+ }
+}
+
+/* Return an array of krb5_enctype values */
+krb5_error_code kerberos_enctype_bitmap_to_enctypes(TALLOC_CTX *mem_ctx, uint32_t enctype_bitmap, krb5_enctype **enctypes)
+{
+ unsigned int i, j = 0;
+ *enctypes = talloc_zero_array(mem_ctx, krb5_enctype, (8*sizeof(enctype_bitmap))+1);
+ if (!*enctypes) {
+ return ENOMEM;
+ }
+ for (i=0; i<(8*sizeof(enctype_bitmap)); i++) {
+ uint32_t bit_value = (1 << i) & enctype_bitmap;
+ if (bit_value & enctype_bitmap) {
+ (*enctypes)[j] = kerberos_enctype_bitmap_to_enctype(bit_value);
+ if (!(*enctypes)[j]) {
+ continue;
+ }
+ j++;
+ }
+ }
+ (*enctypes)[j] = 0;
+ return 0;
+}
git.samba.org / samba.git / blobdiff