diff options
Diffstat (limited to 'third_party/heimdal/kdc/token_validator.c')
| -rw-r--r-- | third_party/heimdal/kdc/token_validator.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/third_party/heimdal/kdc/token_validator.c b/third_party/heimdal/kdc/token_validator.c new file mode 100644 index 0000000..858fdfa --- /dev/null +++ b/third_party/heimdal/kdc/token_validator.c @@ -0,0 +1,122 @@ +/* + * Copyright (c) 2019 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "kdc_locl.h" +#include "token_validator_plugin.h" + +struct plctx { + const char *realm; + const char *token_kind; + krb5_data *token; + const char * const *audiences; + size_t naudiences; + krb5_boolean result; + krb5_principal actual_principal; + krb5_times token_times; +}; + +static krb5_error_code KRB5_LIB_CALL +plcallback(krb5_context context, const void *plug, void *plugctx, void *userctx) +{ + const krb5plugin_token_validator_ftable *validator = plug; + krb5_error_code ret; + struct plctx *plctx = userctx; + + ret = validator->validate(plugctx, context, plctx->realm, + plctx->token_kind, plctx->token, + plctx->audiences, plctx->naudiences, + &plctx->result, &plctx->actual_principal, + &plctx->token_times); + if (ret) { + krb5_free_principal(context, plctx->actual_principal); + plctx->actual_principal = NULL; + } + return ret; +} + +static const char *plugin_deps[] = { "krb5", NULL }; + +static struct heim_plugin_data token_validator_data = { + "kdc", + KDC_PLUGIN_BEARER, + 1, + plugin_deps, + krb5_get_instance +}; + +/* + * Invoke a plugin to validate a JWT/SAML/OIDC token and partially-evaluate + * access control. + */ +KDC_LIB_FUNCTION krb5_error_code KDC_LIB_CALL +kdc_validate_token(krb5_context context, + const char *realm, + const char *token_kind, + krb5_data *token, + const char * const *audiences, + size_t naudiences, + krb5_principal *actual_principal, + krb5_times *token_times) +{ + krb5_error_code ret; + struct plctx ctx; + + memset(&ctx, 0, sizeof(ctx)); + ctx.realm = realm; + ctx.token_kind = token_kind; + ctx.token = token; + ctx.audiences = audiences; + ctx.naudiences = naudiences; + ctx.result = FALSE; + ctx.actual_principal = NULL; + + krb5_clear_error_message(context); + ret = _krb5_plugin_run_f(context, &token_validator_data, 0, &ctx, + plcallback); + if (ret == 0 && ctx.result && actual_principal) { + *actual_principal = ctx.actual_principal; + ctx.actual_principal = NULL; + } + + if (token_times) + *token_times = ctx.token_times; + + krb5_free_principal(context, ctx.actual_principal); + if (ret) + krb5_prepend_error_message(context, ret, "bearer token validation " + "failed: "); + else if (!ctx.result) + krb5_set_error_message(context, ret = EACCES, + "bearer token validation failed"); + return ret; +} |