static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
const char *realm_str,
const char *princ_str,
const char *keytab_name,
const krb5_deltat lifetime,
const char **ccname_out,
time_t *expire_time_out)
{
char *ccname;
char *realm_name = NULL;
char *full_princ = NULL;
char *default_realm = NULL;
char *tmp_str = NULL;
krb5_context context = NULL;
krb5_keytab keytab = NULL;
krb5_ccache ccache = NULL;
krb5_principal kprinc;
krb5_creds my_creds;
krb5_get_init_creds_opt options;
krb5_error_code krberr;
krb5_timestamp kdc_time_offset;
int canonicalize = 0;
int kdc_time_offset_usec;
int ret;
krberr = krb5_init_context(&context);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to init kerberos context\n"));
return krberr;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("Kerberos context initialized\n"));
krberr = set_child_debugging(context);
if (krberr != EOK) {
DEBUG(SSSDBG_MINOR_FAILURE, ("Cannot set krb5_child debugging\n"));
}
if (!realm_str) {
krberr = krb5_get_default_realm(context, &default_realm);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to get default realm name: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
realm_name = talloc_strdup(memctx, default_realm);
krb5_free_default_realm(context, default_realm);
if (!realm_name) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
} else {
realm_name = talloc_strdup(memctx, realm_str);
if (!realm_name) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("got realm_name: [%s]\n", realm_name));
if (princ_str) {
if (!strchr(princ_str, '@')) {
full_princ = talloc_asprintf(memctx, "%s@%s",
princ_str, realm_name);
} else {
full_princ = talloc_strdup(memctx, princ_str);
}
} else {
char hostname[512];
ret = gethostname(hostname, 511);
if (ret == -1) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
hostname[511] = '\0';
DEBUG(SSSDBG_TRACE_LIBS, ("got hostname: [%s]\n", hostname));
ret = select_principal_from_keytab(memctx, hostname, realm_name,
keytab_name, &full_princ, NULL, NULL);
if (ret) {
krberr = KRB5_KT_IOERR;
goto done;
}
}
if (!full_princ) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
DEBUG(SSSDBG_CONF_SETTINGS, ("Principal name is: [%s]\n", full_princ));
krberr = krb5_parse_name(context, full_princ, &kprinc);
if (krberr) {
DEBUG(2, ("Unable to build principal: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
if (keytab_name) {
krberr = krb5_kt_resolve(context, keytab_name, &keytab);
} else {
krberr = krb5_kt_default(context, &keytab);
}
DEBUG(SSSDBG_CONF_SETTINGS, ("Using keytab [%s]\n", KEYTAB_CLEAN_NAME));
if (krberr) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Failed to read keytab file [%s]: %s\n",
KEYTAB_CLEAN_NAME,
sss_krb5_get_error_message(context, krberr)));
goto done;
}
/* Verify the keytab */
ret = sss_krb5_verify_keytab_ex(full_princ, keytab_name, context, keytab);
if (ret) {
DEBUG(SSSDBG_OP_FAILURE,
("Unable to verify principal is present in the keytab\n"));
krberr = KRB5_KT_IOERR;
goto done;
}
ccname = talloc_asprintf(memctx, "FILE:%s/ccache_%s", DB_PATH, realm_name);
if (!ccname) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("keytab ccname: [%s]\n", ccname));
krberr = krb5_cc_resolve(context, ccname, &ccache);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to set cache name: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
memset(&my_creds, 0, sizeof(my_creds));
memset(&options, 0, sizeof(options));
krb5_get_init_creds_opt_set_address_list(&options, NULL);
krb5_get_init_creds_opt_set_forwardable(&options, 0);
krb5_get_init_creds_opt_set_proxiable(&options, 0);
krb5_get_init_creds_opt_set_tkt_life(&options, lifetime);
tmp_str = getenv("KRB5_CANONICALIZE");
if (tmp_str != NULL && strcasecmp(tmp_str, "true") == 0) {
DEBUG(SSSDBG_CONF_SETTINGS, ("Will canonicalize principals\n"));
canonicalize = 1;
}
sss_krb5_get_init_creds_opt_set_canonicalize(&options, canonicalize);
krberr = krb5_get_init_creds_keytab(context, &my_creds, kprinc,
keytab, 0, NULL, &options);
if (krberr) {
DEBUG(SSSDBG_FATAL_FAILURE,
("Failed to init credentials: %s\n",
sss_krb5_get_error_message(context, krberr)));
sss_log(SSS_LOG_ERR,
"Failed to initialize credentials using keytab [%s]: %s. "
"Unable to create GSSAPI-encrypted LDAP connection.",
KEYTAB_CLEAN_NAME,
sss_krb5_get_error_message(context, krberr));
goto done;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("credentials initialized\n"));
/* Use updated principal if changed due to canonicalization. */
krberr = krb5_cc_initialize(context, ccache, my_creds.client);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to init ccache: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
krberr = krb5_cc_store_cred(context, ccache, &my_creds);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to store creds: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("credentials stored\n"));
#ifdef HAVE_KRB5_GET_TIME_OFFSETS
krberr = krb5_get_time_offsets(context, &kdc_time_offset,
&kdc_time_offset_usec);
if (krberr) {
DEBUG(SSSDBG_OP_FAILURE, ("Failed to get KDC time offset: %s\n",
sss_krb5_get_error_message(context, krberr)));
kdc_time_offset = 0;
} else {
if (kdc_time_offset_usec > 0) {
kdc_time_offset++;
}
}
DEBUG(SSSDBG_TRACE_INTERNAL, ("Got KDC time offset\n"));
#else
/* If we don't have this function, just assume no offset */
kdc_time_offset = 0;
#endif
krberr = 0;
*ccname_out = ccname;
*expire_time_out = my_creds.times.endtime - kdc_time_offset;
done:
if (krberr != 0) KRB5_SYSLOG(krberr);
if (keytab) krb5_kt_close(context, keytab);
if (context) krb5_free_context(context);
return krberr;
}
static krb5_error_code ldap_child_get_tgt_sync(TALLOC_CTX *memctx,
const char *realm_str,
const char *princ_str,
const char *keytab_name,
const krb5_deltat lifetime,
const char **ccname_out,
time_t *expire_time_out)
{
char *ccname;
char *realm_name = NULL;
char *full_princ = NULL;
char *default_realm = NULL;
krb5_context context = NULL;
krb5_keytab keytab = NULL;
krb5_ccache ccache = NULL;
krb5_principal kprinc;
krb5_creds my_creds;
krb5_get_init_creds_opt options;
krb5_error_code krberr;
krb5_timestamp kdc_time_offset;
int kdc_time_offset_usec;
int ret;
krberr = krb5_init_context(&context);
if (krberr) {
DEBUG(2, ("Failed to init kerberos context\n"));
return krberr;
}
if (!realm_str) {
krberr = krb5_get_default_realm(context, &default_realm);
if (krberr) {
DEBUG(2, ("Failed to get default realm name: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
realm_name = talloc_strdup(memctx, default_realm);
krb5_free_default_realm(context, default_realm);
if (!realm_name) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
} else {
realm_name = talloc_strdup(memctx, realm_str);
if (!realm_name) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
}
if (princ_str) {
if (!strchr(princ_str, '@')) {
full_princ = talloc_asprintf(memctx, "%s@%s",
princ_str, realm_name);
} else {
full_princ = talloc_strdup(memctx, princ_str);
}
} else {
char hostname[512];
ret = gethostname(hostname, 511);
if (ret == -1) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
hostname[511] = '\0';
ret = select_principal_from_keytab(memctx, hostname, realm_name,
keytab_name, &full_princ, NULL, NULL);
if (ret) goto done;
}
if (!full_princ) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
DEBUG(4, ("Principal name is: [%s]\n", full_princ));
krberr = krb5_parse_name(context, full_princ, &kprinc);
if (krberr) {
DEBUG(2, ("Unable to build principal: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
if (keytab_name) {
krberr = krb5_kt_resolve(context, keytab_name, &keytab);
} else {
krberr = krb5_kt_default(context, &keytab);
}
if (krberr) {
DEBUG(0, ("Failed to read keytab file: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
/* Verify the keytab */
ret = sss_krb5_verify_keytab_ex(full_princ, keytab_name, context, keytab);
if (ret) {
DEBUG(2, ("Unable to verify principal is present in the keytab\n"));
krberr = KRB5_KT_IOERR;
goto done;
}
ccname = talloc_asprintf(memctx, "FILE:%s/ccache_%s", DB_PATH, realm_name);
if (!ccname) {
krberr = KRB5KRB_ERR_GENERIC;
goto done;
}
krberr = krb5_cc_resolve(context, ccname, &ccache);
if (krberr) {
DEBUG(2, ("Failed to set cache name: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
memset(&my_creds, 0, sizeof(my_creds));
memset(&options, 0, sizeof(options));
krb5_get_init_creds_opt_set_address_list(&options, NULL);
krb5_get_init_creds_opt_set_forwardable(&options, 0);
krb5_get_init_creds_opt_set_proxiable(&options, 0);
krb5_get_init_creds_opt_set_tkt_life(&options, lifetime);
krberr = krb5_get_init_creds_keytab(context, &my_creds, kprinc,
keytab, 0, NULL, &options);
if (krberr) {
DEBUG(0, ("Failed to init credentials: %s\n",
sss_krb5_get_error_message(context, krberr)));
sss_log(SSS_LOG_ERR, "Failed to initialize credentials using keytab [%s]: %s. "
"Unable to create GSSAPI-encrypted LDAP connection.",
keytab_name, sss_krb5_get_error_message(context, krberr));
goto done;
}
krberr = krb5_cc_initialize(context, ccache, kprinc);
if (krberr) {
DEBUG(2, ("Failed to init ccache: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
krberr = krb5_cc_store_cred(context, ccache, &my_creds);
if (krberr) {
DEBUG(2, ("Failed to store creds: %s\n",
sss_krb5_get_error_message(context, krberr)));
goto done;
}
krberr = krb5_get_time_offsets(context, &kdc_time_offset, &kdc_time_offset_usec);
if (krberr) {
DEBUG(2, ("Failed to get KDC time offset: %s\n",
sss_krb5_get_error_message(context, krberr)));
kdc_time_offset = 0;
} else {
if (kdc_time_offset_usec > 0) {
kdc_time_offset++;
}
}
krberr = 0;
*ccname_out = ccname;
*expire_time_out = my_creds.times.endtime - kdc_time_offset;
done:
if (keytab) krb5_kt_close(context, keytab);
if (context) krb5_free_context(context);
return krberr;
}
