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freeipa/client/ipa-getkeytab.c
Martin Babinsky 0c68c27e51 extend ipa-getkeytab to support other LDAP bind methods 
ipa-getkeytab command was augmented in a way that allows more flexible
selection of bind mechanisms:

   * -H <LDAP_URI> option was added to specify full LDAP uri. By default the
     URI will be constructed from retrieved server name as is done now.
     Specifying this options precludes use of -s.

   * -Y <EXTERNAL|GSSAPI> specifes SASL bind mechanism if no bind DN
     was given (which implies simple bind)

This allows the command to be used also locally via LDAPI, eliminating the
need to provide any credentials at all as root (e.g. in installers)

https://fedorahosted.org/freeipa/ticket/6409

Reviewed-By: Simo Sorce <ssorce@redhat.com>
2016-11-08 17:02:44 +01:00

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/* Authors: Simo Sorce <ssorce@redhat.com>
*
* Copyright (C) 2007 Red Hat
* see file 'COPYING' for use and warranty information
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <krb5.h>
#include <ldap.h>
#include <sasl/sasl.h>
#include <popt.h>
#include <ini_configobj.h>
#include "config.h"
#include "ipa_krb5.h"
#include "ipa_asn1.h"
#include "ipa-client-common.h"
#define DEFAULT_CA_CERT_FILE "/etc/ipa/ca.crt"
#define LDAP_SASL_EXTERNAL "EXTERNAL"
#define LDAP_SASL_GSSAPI "GSSAPI"
#define SCHEMA_LDAP "ldap://"
#define SCHEMA_LDAPS "ldaps://"
static int check_sasl_mech(const char *mech)
{
int i;
int ret = 1;
const char *supported_sasl_mechs[] = {
LDAP_SASL_EXTERNAL,
LDAP_SASL_GSSAPI,
NULL
};
for (i=0; NULL != supported_sasl_mechs[i]; i++) {
if (strcmp(mech, supported_sasl_mechs[i]) == 0) {
return 0;
}
}
return ret;
}
static int ldap_sasl_interact(LDAP *ld, unsigned flags, void *priv_data, void *sit)
{
sasl_interact_t *in = NULL;
int ret = LDAP_OTHER;
krb5_principal princ = (krb5_principal)priv_data;
krb5_context krbctx;
char *outname = NULL;
krb5_error_code krberr;
if (!ld) return LDAP_PARAM_ERROR;
for (in = sit; in && in->id != SASL_CB_LIST_END; in++) {
switch(in->id) {
case SASL_CB_USER:
krberr = krb5_init_context(&krbctx);
if (krberr) {
fprintf(stderr, _("Kerberos context initialization failed: %1$s (%2$d)\n"),
error_message(krberr), krberr);
in->result = NULL;
in->len = 0;
ret = LDAP_LOCAL_ERROR;
break;
}
krberr = krb5_unparse_name(krbctx, princ, &outname);
if (krberr) {
fprintf(stderr, _("Unable to parse principal: %1$s (%2$d)\n"),
error_message(krberr), krberr);
in->result = NULL;
in->len = 0;
ret = LDAP_LOCAL_ERROR;
break;
}
in->result = outname;
in->len = strlen(outname);
ret = LDAP_SUCCESS;
krb5_free_context(krbctx);
break;
case SASL_CB_GETREALM:
in->result = princ->realm.data;
in->len = princ->realm.length;
ret = LDAP_SUCCESS;
break;
default:
in->result = NULL;
in->len = 0;
ret = LDAP_OTHER;
}
}
return ret;
}
int filter_keys(krb5_context krbctx, struct keys_container *keys,
ber_int_t *enctypes)
{
struct krb_key_salt *ksdata;
int i, j, n;
n = keys->nkeys;
ksdata = keys->ksdata;
for (i = 0; i < n; i++) {
if (ksdata[i].enctype == enctypes[i]) continue;
if (enctypes[i] == 0) {
/* remove unsupported one */
krb5_free_keyblock_contents(krbctx, &ksdata[i].key);
krb5_free_data_contents(krbctx, &ksdata[i].salt);
for (j = i; j < n-1; j++) {
ksdata[j] = ksdata[j + 1];
enctypes[j] = enctypes[j + 1];
}
n--;
/* new key has been moved to this position, make sure
* we do not skip it, by neutralizing next i increment */
i--;
}
}
if (n == 0) {
fprintf(stderr, _("No keys accepted by KDC\n"));
return 0;
}
keys->nkeys = n;
return n;
}
static int ipa_server_to_uri(const char *servername, const char *mech,
char **ldap_uri)
{
char *url = NULL;
int url_len = 0;
int port = 389;
url_len = asprintf(&url, "%s%s:%d", SCHEMA_LDAP, servername, port);
if (url_len == -1) {
fprintf(stderr, _("Out of memory \n"));
return LDAP_NO_MEMORY;
}
*ldap_uri = url;
return 0;
}
static int ipa_ldap_init(LDAP **ld, const char *ldap_uri)
{
int rc = 0;
rc = ldap_initialize(ld, ldap_uri);
return rc;
}
static int ipa_tls_ssl_init(LDAP *ld, const char *ldap_uri)
{
int ret = LDAP_SUCCESS;
int tls_hard = LDAP_OPT_X_TLS_HARD;
int tls_demand = LDAP_OPT_X_TLS_DEMAND;
if (strncmp(ldap_uri, SCHEMA_LDAP, sizeof(SCHEMA_LDAP) - 1) == 0) {
ret = ldap_set_option(ld, LDAP_OPT_X_TLS_REQUIRE_CERT, &tls_demand);
if (ret != LDAP_OPT_SUCCESS) {
fprintf(stderr, _("Unable to set LDAP_OPT_X_TLS_REQUIRE_CERT\n"));
return ret;
}
ret = ldap_start_tls_s(ld, NULL, NULL);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Unable to initialize STARTTLS session\n"));
return ret;
}
} else if (strncmp(ldap_uri, SCHEMA_LDAPS, sizeof(SCHEMA_LDAPS) - 1) == 0) {
ret = ldap_set_option(ld, LDAP_OPT_X_TLS, &tls_hard);
if (ret != LDAP_OPT_SUCCESS) {
fprintf(stderr, _("Unable to set LDAP_OPT_X_TLS\n"));
return ret;
}
}
return ret;
}
static int ipa_ldap_bind(const char *ldap_uri, krb5_principal bind_princ,
const char *bind_dn, const char *bind_pw,
const char *mech, const char *ca_cert_file,
LDAP **_ld)
{
char *msg = NULL;
struct berval bv;
int version;
LDAP *ld;
int ret;
/* TODO: support referrals ? */
ret = ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE, ca_cert_file);
if (ret != LDAP_OPT_SUCCESS) {
fprintf(stderr, _("Unable to set LDAP_OPT_X_TLS_CERTIFICATE\n"));
return ret;
}
ret = ipa_ldap_init(&ld, ldap_uri);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Unable to init connection to %s\n"), ldap_uri);
return ret;
}
if (ld == NULL) {
fprintf(stderr, _("Unable to initialize ldap library!\n"));
return LDAP_OPERATIONS_ERROR;
}
#ifdef LDAP_OPT_X_SASL_NOCANON
/* Don't do DNS canonicalization */
ret = ldap_set_option(ld, LDAP_OPT_X_SASL_NOCANON, LDAP_OPT_ON);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Unable to set LDAP_OPT_X_SASL_NOCANON\n"));
goto done;
}
#endif
version = LDAP_VERSION3;
ret = ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &version);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Unable to set LDAP_OPT_PROTOCOL_VERSION\n"));
goto done;
}
ret = ipa_tls_ssl_init(ld, ldap_uri);
if (ret != LDAP_OPT_SUCCESS) {
goto done;
}
if (bind_dn) {
bv.bv_val = discard_const(bind_pw);
bv.bv_len = strlen(bind_pw);
ret = ldap_sasl_bind_s(ld, bind_dn, LDAP_SASL_SIMPLE,
&bv, NULL, NULL, NULL);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Simple bind failed\n"));
goto done;
}
} else {
if (strcmp(mech, LDAP_SASL_EXTERNAL) == 0) {
ret = ldap_sasl_bind_s(ld, NULL, LDAP_SASL_EXTERNAL,
NULL, NULL, NULL, NULL);
} else {
ret = ldap_sasl_interactive_bind_s(ld, NULL, LDAP_SASL_GSSAPI,
NULL, NULL, LDAP_SASL_QUIET,
ldap_sasl_interact, bind_princ);
}
if (ret != LDAP_SUCCESS) {
#ifdef LDAP_OPT_DIAGNOSTIC_MESSAGE
ldap_get_option(ld, LDAP_OPT_DIAGNOSTIC_MESSAGE, (void*)&msg);
#endif
fprintf(stderr, "SASL Bind failed %s (%d) %s!\n",
ldap_err2string(ret), ret, msg ? msg : "");
goto done;
}
}
ret = LDAP_SUCCESS;
done:
if (ret != LDAP_SUCCESS) {
if (ld) ldap_unbind_ext(ld, NULL, NULL);
} else {
*_ld = ld;
}
return ret;
}
static int ipa_ldap_extended_op(LDAP *ld, const char *reqoid,
struct berval *control,
LDAPControl ***srvctrl)
{
struct berval *retdata = NULL;
LDAPMessage *res = NULL;
char *retoid = NULL;
struct timeval tv;
char *err = NULL;
int msgid;
int ret, rc;
ret = ldap_extended_operation(ld, reqoid, control,
NULL, NULL, &msgid);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Operation failed: %s\n"), ldap_err2string(ret));
return ret;
}
/* wait max 100 secs for the answer */
tv.tv_sec = 100;
tv.tv_usec = 0;
ret = ldap_result(ld, msgid, 1, &tv, &res);
if (ret == -1) {
fprintf(stderr, _("Failed to get result: %s\n"), ldap_err2string(ret));
goto done;
}
else if (res == NULL) {
fprintf(stderr, _("Timeout exceeded."));
goto done;
}
ret = ldap_parse_extended_result(ld, res, &retoid, &retdata, 0);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Failed to parse extended result: %s\n"),
ldap_err2string(ret));
goto done;
}
ret = ldap_parse_result(ld, res, &rc, NULL, &err, NULL, srvctrl, 0);
if (ret != LDAP_SUCCESS || rc != LDAP_SUCCESS) {
fprintf(stderr, _("Failed to parse result: %s\n"),
err ? err : ldap_err2string(ret));
if (ret == LDAP_SUCCESS) ret = rc;
goto done;
}
done:
if (err) ldap_memfree(err);
if (res) ldap_msgfree(res);
return ret;
}
static int find_control_data(LDAPControl **list, const char *repoid,
struct berval *data)
{
LDAPControl *control = NULL;
int i;
if (!list) {
fprintf(stderr, _("Missing reply control list!\n"));
return LDAP_OPERATIONS_ERROR;
}
for (i = 0; list[i]; i++) {
if (strcmp(list[i]->ldctl_oid, repoid) == 0) {
control = list[i];
}
}
if (!control) {
fprintf(stderr, _("Missing reply control!\n"));
return LDAP_OPERATIONS_ERROR;
}
*data = control->ldctl_value;
return LDAP_SUCCESS;
}
static BerElement *get_control_data(LDAPControl **list, const char *repoid)
{
struct berval data;
int ret;
ret = find_control_data(list, repoid, &data);
if (ret != LDAP_SUCCESS) return NULL;
return ber_init(&data);
}
static int ldap_set_keytab(krb5_context krbctx,
const char *ldap_uri,
const char *principal_name,
krb5_principal princ,
const char *binddn,
const char *bindpw,
const char *mech,
const char *ca_cert_file,
struct keys_container *keys)
{
LDAP *ld = NULL;
BerElement *sctrl = NULL;
struct berval *control = NULL;
LDAPControl **srvctrl = NULL;
int ret;
int kvno, i;
ber_tag_t rtag;
ber_int_t *encs = NULL;
int successful_keys = 0;
/* cant' return more than nkeys, sometimes less */
encs = calloc(keys->nkeys + 1, sizeof(ber_int_t));
if (!encs) {
fprintf(stderr, _("Out of Memory!\n"));
return 0;
}
/* build password change control */
control = create_key_control(keys, principal_name);
if (!control) {
fprintf(stderr, _("Failed to create control!\n"));
goto error_out;
}
ret = ipa_ldap_bind(ldap_uri, princ, binddn, bindpw, mech, ca_cert_file, &ld);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Failed to bind to server!\n"));
goto error_out;
}
/* perform password change */
ret = ipa_ldap_extended_op(ld, KEYTAB_SET_OID, control, &srvctrl);
if (ret != LDAP_SUCCESS) {
fprintf(stderr, _("Failed to get keytab!\n"));
goto error_out;
}
ber_bvfree(control);
control = NULL;
sctrl = get_control_data(srvctrl, KEYTAB_RET_OID);
if (!sctrl) {
fprintf(stderr, _("ber_init() failed, Invalid control ?!\n"));
goto error_out;
}
/* Format of response
*
* KeytabGetRequest ::= SEQUENCE {
* new_kvno Int32
* SEQUENCE OF KeyTypes
* }
*
* * List of accepted enctypes *
* KeyTypes ::= SEQUENCE {
* enctype Int32
* }
*/
rtag = ber_scanf(sctrl, "{i{", &kvno);
if (rtag == LBER_ERROR) {
fprintf(stderr, _("ber_scanf() failed, unable to find kvno ?!\n"));
goto error_out;
}
for (i = 0; i < keys->nkeys; i++) {
ret = ber_scanf(sctrl, "{i}", &encs[i]);
if (ret == LBER_ERROR) {
char enc[79]; /* fit std terminal or truncate */
krb5_error_code krberr;
krberr = krb5_enctype_to_string(
keys->ksdata[i].enctype, enc, 79);
if (krberr) {
fprintf(stderr, _("Failed to retrieve "
"encryption type type #%d\n"),
keys->ksdata[i].enctype);
} else {
fprintf(stderr, _("Failed to retrieve "
"encryption type %1$s (#%2$d)\n"),
enc, keys->ksdata[i].enctype);
}
} else {
successful_keys++;
}
}
if (successful_keys == 0) {
fprintf(stderr, _("Failed to retrieve any keys"));
goto error_out;
}
ret = filter_keys(krbctx, keys, encs);
if (ret == 0) goto error_out;
ber_free(sctrl, 1);
ldap_controls_free(srvctrl);
ldap_unbind_ext(ld, NULL, NULL);
free(encs);
return kvno;
error_out:
if (sctrl) ber_free(sctrl, 1);
if (srvctrl) ldap_controls_free(srvctrl);
if (ld) ldap_unbind_ext(ld, NULL, NULL);
if (control) ber_bvfree(control);
free(encs);
return -1;
}
/* use asn1c generated code to fill up control */
static struct berval *create_getkeytab_control(const char *svc_princ, bool gen,
const char *password,
struct krb_key_salt *encsalts,
int num_encsalts)
{
struct berval *result = NULL;
void *buffer = NULL;
size_t buflen;
long ets[num_encsalts];
bool ret;
int i;
if (gen) {
for (i = 0; i < num_encsalts; i++) {
ets[i] = encsalts[i].enctype;
}
}
ret = ipaasn1_enc_getkt(gen, svc_princ,
password, ets, num_encsalts,
&buffer, &buflen);
if (!ret) goto done;
result = malloc(sizeof(struct berval));
if (!result) goto done;
result->bv_val = buffer;
result->bv_len = buflen;
done:
if (result == NULL) {
if (buffer) {
free(buffer);
}
}
return result;
}
#define GK_REPLY_TAG (LBER_CLASS_CONTEXT | LBER_CONSTRUCTED | 2)
#define GKREP_KEY_TAG (LBER_CLASS_CONTEXT | LBER_CONSTRUCTED | 0)
#define GKREP_SALT_TAG (LBER_CLASS_CONTEXT | LBER_CONSTRUCTED | 1)
static int ldap_get_keytab(krb5_context krbctx, bool generate, char *password,
const char *enctypes, const char *ldap_uri,
const char *svc_princ, krb5_principal bind_princ,
const char *bind_dn, const char *bind_pw,
const char *mech,
const char *ca_cert_file,
struct keys_container *keys, int *kvno,
char **err_msg)
{
struct krb_key_salt *es = NULL;
int num_es = 0;
struct berval *control = NULL;
LDAP *ld = NULL;
LDAPControl **srvctrl = NULL;
struct berval data;
bool res;
int ret;
*err_msg = NULL;
if (enctypes) {
ret = ipa_string_to_enctypes(enctypes, &es, &num_es, err_msg);
if (ret || num_es == 0) {
return LDAP_OPERATIONS_ERROR;
}
}
control = create_getkeytab_control(svc_princ, generate,
password, es, num_es);
if (!control) {
*err_msg = _("Failed to create control!\n");
ret = LDAP_OPERATIONS_ERROR;
goto done;
}
ret = ipa_ldap_bind(ldap_uri, bind_princ, bind_dn, bind_pw, mech,
ca_cert_file, &ld);
if (ret != LDAP_SUCCESS) {
*err_msg = _("Failed to bind to server!\n");
goto done;
}
/* perform extedned opt to get keytab */
ret = ipa_ldap_extended_op(ld, KEYTAB_GET_OID, control, &srvctrl);
if (ret != LDAP_SUCCESS) {
goto done;
}
ret = find_control_data(srvctrl, KEYTAB_GET_OID, &data);
if (ret != LDAP_SUCCESS) goto done;
res = ipaasn1_dec_getktreply(data.bv_val, data.bv_len, kvno, keys);
if (!res) {
*err_msg = _("Failed to decode control reply!\n");
ret = LDAP_OPERATIONS_ERROR;
goto done;
}
ret = LDAP_SUCCESS;
done:
if (ld) ldap_unbind_ext(ld, NULL, NULL);
if (control) ber_bvfree(control);
free(es);
if (ret) {
free_keys_contents(krbctx, keys);
}
return ret;
}
static char *ask_password(krb5_context krbctx)
{
krb5_prompt ap_prompts[2];
krb5_data k5d_pw0;
krb5_data k5d_pw1;
char pw0[256];
char pw1[256];
char *password;
k5d_pw0.length = sizeof(pw0);
k5d_pw0.data = pw0;
ap_prompts[0].prompt = _("New Principal Password");
ap_prompts[0].hidden = 1;
ap_prompts[0].reply = &k5d_pw0;
k5d_pw1.length = sizeof(pw1);
k5d_pw1.data = pw1;
ap_prompts[1].prompt = _("Verify Principal Password");
ap_prompts[1].hidden = 1;
ap_prompts[1].reply = &k5d_pw1;
krb5_prompter_posix(krbctx, NULL,
NULL, NULL,
2, ap_prompts);
if (strcmp(pw0, pw1)) {
fprintf(stderr, _("Passwords do not match!"));
return NULL;
}
password = malloc(k5d_pw0.length + 1);
if (!password) return NULL;
memcpy(password, pw0, k5d_pw0.length);
password[k5d_pw0.length] = '\0';
return password;
}
struct ipa_config {
const char *server_name;
};
static int config_from_file(struct ini_cfgobj *cfgctx)
{
struct ini_cfgfile *fctx = NULL;
char **errors = NULL;
int ret;
ret = ini_config_file_open(IPACONFFILE, 0, &fctx);
if (ret) {
fprintf(stderr, _("Failed to open config file %s\n"), IPACONFFILE);
return ret;
}
ret = ini_config_parse(fctx,
INI_STOP_ON_ANY,
INI_MS_MERGE | INI_MV1S_ALLOW | INI_MV2S_ALLOW,
INI_PARSE_NOWRAP,
cfgctx);
if (ret) {
fprintf(stderr, _("Failed to parse config file %s\n"), IPACONFFILE);
if (ini_config_error_count(cfgctx)) {
ini_config_get_errors(cfgctx, &errors);
if (errors) {
ini_config_print_errors(stderr, errors);
ini_config_free_errors(errors);
}
}
ini_config_file_destroy(fctx);
return ret;
}
ini_config_file_destroy(fctx);
return 0;
}
int read_ipa_config(struct ipa_config **ipacfg)
{
struct ini_cfgobj *cfgctx = NULL;
struct value_obj *obj = NULL;
int ret;
*ipacfg = calloc(1, sizeof(struct ipa_config));
if (!*ipacfg) {
return ENOMEM;
}
ret = ini_config_create(&cfgctx);
if (ret) {
return ENOENT;
}
ret = config_from_file(cfgctx);
if (ret) {
ini_config_destroy(cfgctx);
return EINVAL;
}
ret = ini_get_config_valueobj("global", "server", cfgctx,
INI_GET_LAST_VALUE, &obj);
if (ret != 0 || obj == NULL) {
/* if called on an IPA server we need to look for 'host' instead */
ret = ini_get_config_valueobj("global", "host", cfgctx,
INI_GET_LAST_VALUE, &obj);
}
if (ret == 0 && obj != NULL) {
(*ipacfg)->server_name = ini_get_string_config_value(obj, &ret);
}
return 0;
}
int main(int argc, const char *argv[])
{
static const char *server = NULL;
static const char *principal = NULL;
static const char *keytab = NULL;
static const char *enctypes_string = NULL;
static const char *binddn = NULL;
static const char *bindpw = NULL;
char *ldap_uri = NULL;
static const char *sasl_mech = NULL;
static const char *ca_cert_file = NULL;
int quiet = 0;
int askpass = 0;
int permitted_enctypes = 0;
int retrieve = 0;
struct poptOption options[] = {
{ "quiet", 'q', POPT_ARG_NONE, &quiet, 0,
_("Print as little as possible"), _("Output only on errors")},
{ "server", 's', POPT_ARG_STRING, &server, 0,
_("Contact this specific KDC Server"),
_("Server Name") },
{ "principal", 'p', POPT_ARG_STRING, &principal, 0,
_("The principal to get a keytab for (ex: ftp/ftp.example.com@EXAMPLE.COM)"),
_("Kerberos Service Principal Name") },
{ "keytab", 'k', POPT_ARG_STRING, &keytab, 0,
_("File were to store the keytab information"),
_("Keytab File Name") },
{ "enctypes", 'e', POPT_ARG_STRING, &enctypes_string, 0,
_("Encryption types to request"),
_("Comma separated encryption types list") },
{ "permitted-enctypes", 0, POPT_ARG_NONE, &permitted_enctypes, 0,
_("Show the list of permitted encryption types and exit"),
_("Permitted Encryption Types") },
{ "password", 'P', POPT_ARG_NONE, &askpass, 0,
_("Asks for a non-random password to use for the principal"), NULL },
{ "binddn", 'D', POPT_ARG_STRING, &binddn, 0,
_("LDAP DN"), _("DN to bind as if not using kerberos") },
{ "bindpw", 'w', POPT_ARG_STRING, &bindpw, 0,
_("LDAP password"), _("password to use if not using kerberos") },
{ "cacert", 0, POPT_ARG_STRING, &ca_cert_file, 0,
_("Path to the IPA CA certificate"), _("IPA CA certificate")},
{ "ldapuri", 'H', POPT_ARG_STRING, &ldap_uri, 0,
_("LDAP uri to connect to. Mutually exclusive with --server"),
_("url")},
{ "mech", 'Y', POPT_ARG_STRING, &sasl_mech, 0,
_("LDAP SASL bind mechanism if no bindd/bindpw"),
_("GSSAPI|EXTERNAL") },
{ "retrieve", 'r', POPT_ARG_NONE, &retrieve, 0,
_("Retrieve current keys without changing them"), NULL },
POPT_AUTOHELP
POPT_TABLEEND
};
poptContext pc;
char *ktname;
char *password = NULL;
krb5_context krbctx;
krb5_ccache ccache;
krb5_principal uprinc = NULL;
krb5_principal sprinc;
krb5_error_code krberr;
struct keys_container keys = { 0 };
krb5_keytab kt;
int kvno;
int i, ret;
char *err_msg;
ret = init_gettext();
if (ret) {
fprintf(stderr, "Failed to load translations\n");
}
krberr = krb5_init_context(&krbctx);
if (krberr) {
fprintf(stderr, _("Kerberos context initialization failed\n"));
exit(1);
}
pc = poptGetContext("ipa-getkeytab", argc, (const char **)argv, options, 0);
ret = poptGetNextOpt(pc);
if (ret == -1 && permitted_enctypes &&
!(server || principal || keytab || quiet)) {
krb5_enctype *ktypes;
char enc[79]; /* fit std terminal or truncate */
krberr = krb5_get_permitted_enctypes(krbctx, &ktypes);
if (krberr) {
fprintf(stderr, _("No system preferred enctypes ?!\n"));
exit(1);
}
fprintf(stdout, _("Supported encryption types:\n"));
for (i = 0; ktypes[i]; i++) {
krberr = krb5_enctype_to_string(ktypes[i], enc, 79);
if (krberr) {
fprintf(stderr, _("Warning: "
"failed to convert type (#%d)\n"), i);
continue;
}
fprintf(stdout, "%s\n", enc);
}
ipa_krb5_free_ktypes(krbctx, ktypes);
exit (0);
}
if (ret != -1 || !principal || !keytab || permitted_enctypes) {
if (!quiet) {
poptPrintUsage(pc, stderr, 0);
}
exit(2);
}
if (NULL!=binddn && NULL==bindpw) {
fprintf(stderr,
_("Bind password required when using a bind DN.\n"));
if (!quiet)
poptPrintUsage(pc, stderr, 0);
exit(10);
}
if (NULL != binddn && NULL != sasl_mech) {
fprintf(stderr, _("Cannot specify both SASL mechanism "
"and bind DN simultaneously.\n"));
if (!quiet)
poptPrintUsage(pc, stderr, 0);
exit(2);
}
if (sasl_mech && check_sasl_mech(sasl_mech)) {
fprintf(stderr, _("Invalid SASL bind mechanism\n"));
if (!quiet)
poptPrintUsage(pc, stderr, 0);
exit(2);
}
if (!binddn && !sasl_mech) {
sasl_mech = LDAP_SASL_GSSAPI;
}
if (server && ldap_uri) {
fprintf(stderr, _("Cannot specify server and LDAP uri "
"simultaneously.\n"));
if (!quiet)
poptPrintUsage(pc, stderr, 0);
exit(2);
}
if (!server && !ldap_uri) {
struct ipa_config *ipacfg = NULL;
ret = read_ipa_config(&ipacfg);
if (ret == 0) {
server = ipacfg->server_name;
ipacfg->server_name = NULL;
}
free(ipacfg);
if (!server) {
fprintf(stderr, _("Server name not provided and unavailable\n"));
exit(2);
}
}
if (server) {
ret = ipa_server_to_uri(server, sasl_mech, &ldap_uri);
if (ret) {
exit(ret);
}
}
if (!ca_cert_file) {
ca_cert_file = DEFAULT_CA_CERT_FILE;
}
if (askpass && retrieve) {
fprintf(stderr, _("Incompatible options provided (-r and -P)\n"));
exit(2);
}
if (askpass) {
password = ask_password(krbctx);
if (!password) {
exit(2);
}
} else if (enctypes_string && strchr(enctypes_string, ':')) {
if (!quiet) {
fprintf(stderr, _("Warning: salt types are not honored"
" with randomized passwords (see opt. -P)\n"));
}
}
ret = asprintf(&ktname, "WRFILE:%s", keytab);
if (ret == -1) {
exit(3);
}
krberr = krb5_parse_name(krbctx, principal, &sprinc);
if (krberr) {
fprintf(stderr, _("Invalid Service Principal Name\n"));
exit(4);
}
if (NULL == bindpw && strcmp(sasl_mech, LDAP_SASL_GSSAPI) == 0) {
krberr = krb5_cc_default(krbctx, &ccache);
if (krberr) {
fprintf(stderr,
_("Kerberos Credential Cache not found. "
"Do you have a Kerberos Ticket?\n"));
exit(5);
}
krberr = krb5_cc_get_principal(krbctx, ccache, &uprinc);
if (krberr) {
fprintf(stderr,
_("Kerberos User Principal not found. "
"Do you have a valid Credential Cache?\n"));
exit(6);
}
}
krberr = krb5_kt_resolve(krbctx, ktname, &kt);
if (krberr) {
fprintf(stderr, _("Failed to open Keytab\n"));
exit(7);
}
kvno = -1;
ret = ldap_get_keytab(krbctx, (retrieve == 0), password, enctypes_string,
ldap_uri, principal, uprinc, binddn, bindpw,
sasl_mech, ca_cert_file,
&keys, &kvno, &err_msg);
if (ret) {
if (!quiet && err_msg != NULL) {
fprintf(stderr, "%s", err_msg);
}
}
if (retrieve == 0 && kvno == -1) {
if (!quiet) {
fprintf(stderr,
_("Retrying with pre-4.0 keytab retrieval method...\n"));
}
/* create key material */
ret = create_keys(krbctx, sprinc, password, enctypes_string, &keys, &err_msg);
if (!ret) {
if (err_msg != NULL) {
fprintf(stderr, "%s", err_msg);
}
fprintf(stderr, _("Failed to create key material\n"));
exit(8);
}
kvno = ldap_set_keytab(krbctx, ldap_uri, principal, uprinc, binddn,
bindpw, sasl_mech, ca_cert_file, &keys);
}
if (kvno == -1) {
fprintf(stderr, _("Failed to get keytab\n"));
exit(9);
}
for (i = 0; i < keys.nkeys; i++) {
krb5_keytab_entry kt_entry;
memset((char *)&kt_entry, 0, sizeof(kt_entry));
kt_entry.principal = sprinc;
kt_entry.key = keys.ksdata[i].key;
kt_entry.vno = kvno;
krberr = krb5_kt_add_entry(krbctx, kt, &kt_entry);
if (krberr) {
fprintf(stderr,
_("Failed to add key to the keytab\n"));
exit (11);
}
}
free_keys_contents(krbctx, &keys);
krberr = krb5_kt_close(krbctx, kt);
if (krberr) {
fprintf(stderr, _("Failed to close the keytab\n"));
exit (12);
}
if (!quiet) {
fprintf(stderr,
_("Keytab successfully retrieved and stored in: %s\n"),
keytab);
}
exit(0);
}
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