319 lines
11 KiB
C
319 lines
11 KiB
C
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#include "authn_plugin.h"
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#include "authn_plugin_util.h"
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#include "kube_config_util.h"
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#include "kube_config_common.h"
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#include "binary.h"
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#include "cJSON.h"
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#include <time.h>
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#include <errno.h>
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#define OIDC_ID_TOKEN_DELIM "."
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#define OIDC_ID_TOKEN_EXP "exp"
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#define OIDC_CONFIGURATION_URL_TEMPLATE "%s/.well-known/openid-configuration"
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#define OIDC_TOKEN_ENDPOINT "token_endpoint"
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#define OIDC_ID_TOKEN "id_token"
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#define OIDC_REFRESH_TOKEN "refresh_token"
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#define JWT_PART2_BUFFER_SIZE 1024
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#define BASE64_PADDING_STRING_SIZE 4
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#define BASE64_PADDING_CHAR "="
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#define REFRESH_TOKEN_CONTENT_TYPE "application/x-www-form-urlencoded"
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#define REFRESH_TOKEN_CREDENTIAL_TEMPLATE "%s:%s"
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#define REFRESH_TOKEN_POST_DATA_TEMPLATE "refresh_token=%s&grant_type=refresh_token"
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#define OIDC_CONFIGURATION_URL_BUFFER_SIZE 1024
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#define REFRESH_TOKEN_CREDENTIAL_BUFFER_SIZE 1024
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#define REFRESH_TOKEN_POST_DATA_BUFFER_SIZE 1024
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static time_t get_token_expiration_time(const char *token_string)
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{
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static char fname[] = "get_token_expiration_time()";
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time_t expiration_time = 0;
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if (!token_string || '\0' == token_string[0]) {
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return 0;
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}
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char *dup_token_string = strdup(token_string);
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if (!dup_token_string) {
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return 0;
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}
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char *p = NULL;
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p = strtok(dup_token_string, OIDC_ID_TOKEN_DELIM); /* jwt header */
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if (!p) {
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fprintf(stderr, "%s: The token <%s> is not a valid JWT token.\n", fname, token_string);
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goto end;
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}
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p = strtok(NULL, OIDC_ID_TOKEN_DELIM); /* jwt part2 */
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if (!p) {
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fprintf(stderr, "%s: The token <%s> is not a valid JWT token.\n", fname, token_string);
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goto end;
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}
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int base64_padding_length = 4 - strlen(p) % 4;
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char base64_padding_string[BASE64_PADDING_STRING_SIZE];
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memset(base64_padding_string, 0, sizeof(base64_padding_string));
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for (int i = 0; i < base64_padding_length; i++) {
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strncat(base64_padding_string, BASE64_PADDING_CHAR, 1);
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}
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char jwt_part2_string[JWT_PART2_BUFFER_SIZE];
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memset(jwt_part2_string, 0, sizeof(jwt_part2_string));
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snprintf(jwt_part2_string, sizeof(jwt_part2_string), "%s%s", p, base64_padding_string);
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int decoded_bytes = 0;
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char *b64decode = base64decode(jwt_part2_string, strlen(jwt_part2_string), &decoded_bytes);
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if (!b64decode || 0 == decoded_bytes) {
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fprintf(stderr, "%s: Base64 decodes failed.\n", fname);
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goto end;
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}
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cJSON *payload_JSON = cJSON_Parse(b64decode);
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if (!payload_JSON) {
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fprintf(stderr, "%s: Cannot create JSON from string.[%s].\n", fname, cJSON_GetErrorPtr());
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goto end;
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}
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cJSON *json_value = cJSON_GetObjectItem(payload_JSON, OIDC_ID_TOKEN_EXP);
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if (!json_value || json_value->type != cJSON_Number) {
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fprintf(stderr, "%s: Cannot get expiration time in id token.\n", fname);
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goto end;
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}
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expiration_time = json_value->valueint;
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end:
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if (payload_JSON) {
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cJSON_Delete(payload_JSON);
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payload_JSON = NULL;
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}
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if (b64decode) {
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free(b64decode);
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b64decode = NULL;
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}
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if (dup_token_string) {
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free(dup_token_string);
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dup_token_string = NULL;
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}
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return expiration_time;
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}
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char *get_token(kubeconfig_property_t * auth_provider)
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{
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return auth_provider->id_token;
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}
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bool is_expired(kubeconfig_property_t * auth_provider)
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{
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static char fname[] = "is_expired()";
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if (NULL == auth_provider->id_token) {
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fprintf(stderr, "%s: The id token is NULL.\n", fname);
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return true;
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} else if ('\0' == auth_provider->id_token[0]) {
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fprintf(stderr, "%s: The id token is empty.\n", fname);
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return true;
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}
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time_t exp_time = get_token_expiration_time(auth_provider->id_token);
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if (exp_time < time(NULL)) {
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return true;
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}
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return false;
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}
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char *get_token_endpoint(const char *idp_issuer_url, sslConfig_t * sc)
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{
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static char fname[] = "get_token_endpoint()";
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char *token_endpoint = NULL;
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if (!idp_issuer_url || '\0' == idp_issuer_url[0]) {
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fprintf(stderr, "%s: The parameters idp_issuer_url is NULL or empty.\n", fname);
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return NULL;
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}
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if (!sc) {
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fprintf(stderr, "%s: SSL configuration is required.\n", fname);
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return NULL;
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}
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char oidc_configuration_url[OIDC_CONFIGURATION_URL_BUFFER_SIZE];
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memset(oidc_configuration_url, 0, sizeof(oidc_configuration_url));
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snprintf(oidc_configuration_url, sizeof(oidc_configuration_url), OIDC_CONFIGURATION_URL_TEMPLATE, idp_issuer_url);
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char *http_response = NULL;
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int http_response_length = 0;
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int rc = shc_request(&http_response, &http_response_length, HTTP_REQUEST_GET, oidc_configuration_url, sc, NULL, NULL, NULL);
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if (HTTP_RC_OK != rc) {
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fprintf(stderr, "%s: Failed to get token endpoint.\n", fname);
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goto end;
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}
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token_endpoint = shc_get_string_from_json(http_response, OIDC_TOKEN_ENDPOINT);
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end:
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if (http_response) {
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free(http_response);
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http_response_length = 0;
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}
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return token_endpoint;
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}
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static int refresh_oidc_token(kubeconfig_property_t * auth_provider, const char *token_endpoint, sslConfig_t * sc)
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{
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static char fname[] = "refresh_oidc_token()";
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int rc = 0;
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if (!auth_provider || !token_endpoint || !sc) {
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fprintf(stderr, "%s: The parameters are not valid.\n", fname);
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return -1;
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}
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list_t *content_type = list_create();
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if (!content_type) {
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fprintf(stderr, "%s: Cannot create list for content type.[%s]\n", fname, strerror(errno));
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return -1;
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}
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list_addElement(content_type, strdup(REFRESH_TOKEN_CONTENT_TYPE));
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char refresh_token_credential[REFRESH_TOKEN_CREDENTIAL_BUFFER_SIZE];
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memset(refresh_token_credential, 0, sizeof(refresh_token_credential));
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snprintf(refresh_token_credential, sizeof(refresh_token_credential), REFRESH_TOKEN_CREDENTIAL_TEMPLATE, auth_provider->client_id, auth_provider->client_secret);
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char *base64_credential = base64encode(refresh_token_credential, strlen(refresh_token_credential));
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if (!base64_credential) {
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fprintf(stderr, "%s: Cannot encode refresh token with base64.\n", fname);
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rc = -1;
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goto end;
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}
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char basic_token_buffer[BASIC_TOKEN_BUFFER_SIZE];
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memset(basic_token_buffer, 0, sizeof(basic_token_buffer));
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snprintf(basic_token_buffer, sizeof(basic_token_buffer), BASIC_TOKEN_TEMPLATE, base64_credential);
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list_t *api_keys = list_create();
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if (!api_keys) {
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fprintf(stderr, "%s: Cannot create list for refresh token.[%s]\n", fname, strerror(errno));
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rc = -1;
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goto end;
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}
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keyValuePair_t *keyPairToken = keyValuePair_create(strdup(AUTH_TOKEN_KEY), strdup(basic_token_buffer));
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list_addElement(api_keys, keyPairToken);
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char refresh_token_post_data[REFRESH_TOKEN_POST_DATA_BUFFER_SIZE];
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memset(refresh_token_post_data, 0, sizeof(refresh_token_post_data));
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snprintf(refresh_token_post_data, sizeof(refresh_token_post_data), REFRESH_TOKEN_POST_DATA_TEMPLATE, auth_provider->refresh_token);
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char *http_response = NULL;
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int http_response_length = 0;
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rc = shc_request(&http_response, &http_response_length, HTTP_REQUEST_POST, token_endpoint, sc, api_keys, content_type, refresh_token_post_data);
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if (HTTP_RC_OK == rc) {
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rc = 0; // update return code
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} else {
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fprintf(stderr, "%s: Failed to refresh OIDC token.\n", fname);
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rc = -1;
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goto end;
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}
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char *new_id_token = shc_get_string_from_json(http_response, OIDC_ID_TOKEN);
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if (new_id_token) {
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if (auth_provider->id_token) {
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free(auth_provider->id_token);
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auth_provider->id_token = NULL;
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}
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auth_provider->id_token = new_id_token;
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} else {
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fprintf(stderr, "%s: Failed to get the new OIDC token from the response.\n", fname);
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rc = -1;
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goto end;
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}
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char *new_refresh_token = shc_get_string_from_json(http_response, OIDC_REFRESH_TOKEN);
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if (new_refresh_token) {
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if (auth_provider->refresh_token) {
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free(auth_provider->refresh_token);
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auth_provider->refresh_token = NULL;
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}
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auth_provider->refresh_token = new_refresh_token;
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} else {
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rc = -1;
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fprintf(stderr, "%s: Failed to get the new refresh token from the response.\n", fname);
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goto end;
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}
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end:
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if (http_response) {
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free(http_response);
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http_response = NULL;
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http_response_length = 0;
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}
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if (base64_credential) {
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free(base64_credential);
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base64_credential = NULL;
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}
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if (api_keys) {
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clear_and_free_string_pair_list(api_keys);
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api_keys = NULL;
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}
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if (content_type) {
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clear_and_free_string_list(content_type);
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content_type = NULL;
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}
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return rc;
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}
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int refresh(kubeconfig_property_t * auth_provider)
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{
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static char fname[] = "refresh()";
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int rc = 0;
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sslConfig_t *sc = NULL;
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if (auth_provider->idp_certificate_authority && '\0' != auth_provider->idp_certificate_authority[0]) {
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sc = sslConfig_create(NULL, NULL, auth_provider->idp_certificate_authority, 0);
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} else if (auth_provider->idp_certificate_authority_data && '\0' != auth_provider->idp_certificate_authority_data[0]) {
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char *idp_certificate_file = kubeconfig_mk_cert_key_tempfile(auth_provider->idp_certificate_authority_data);
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if (!idp_certificate_file) {
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fprintf(stderr, "%s: Failed to create the temporary file for certificate.\n", fname);
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return -1;
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}
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sc = sslConfig_create(NULL, NULL, idp_certificate_file, 0);
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free(idp_certificate_file);
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idp_certificate_file = NULL;
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} else {
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sc = sslConfig_create(NULL, NULL, NULL, 1);
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}
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if (!sc) {
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fprintf(stderr, "%s: Cannot create the SSL configuration.\n", fname);
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return -1;
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}
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char *token_endpoint = get_token_endpoint(auth_provider->idp_issuer_url, sc);
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if (!token_endpoint) {
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fprintf(stderr, "%s: Cannot get the token endpoint.\n", fname);
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rc = -1;
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goto end;
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}
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rc = refresh_oidc_token(auth_provider, token_endpoint, sc);
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if (-1 == rc) {
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fprintf(stderr, "%s: Failed to refresh OIDC token.\n", fname);
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goto end;
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}
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end:
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if (token_endpoint) {
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free(token_endpoint);
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token_endpoint = NULL;
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}
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if (sc) {
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if (NULL == auth_provider->idp_certificate_authority && auth_provider->idp_certificate_authority_data && '\0' != auth_provider->idp_certificate_authority_data[0]) {
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unsetSslConfig(sc);
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}
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sslConfig_free(sc);
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sc = NULL;
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}
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return rc;
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}
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