YARN-4245. Generalize config file handling in container-executor. Contributed by Sidharta Seethana.
This commit is contained in:
parent
e51a8c1056
commit
8ed2e060e8
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@ -34,34 +34,22 @@
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#define MAX_SIZE 10
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struct confentry {
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const char *key;
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const char *value;
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};
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struct configuration {
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int size;
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struct confentry **confdetails;
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};
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struct configuration config={.size=0, .confdetails=NULL};
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//clean up method for freeing configuration
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void free_configurations() {
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void free_configurations(struct configuration *cfg) {
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int i = 0;
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for (i = 0; i < config.size; i++) {
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if (config.confdetails[i]->key != NULL) {
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free((void *)config.confdetails[i]->key);
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for (i = 0; i < cfg->size; i++) {
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if (cfg->confdetails[i]->key != NULL) {
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free((void *)cfg->confdetails[i]->key);
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}
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if (config.confdetails[i]->value != NULL) {
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free((void *)config.confdetails[i]->value);
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if (cfg->confdetails[i]->value != NULL) {
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free((void *)cfg->confdetails[i]->value);
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}
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free(config.confdetails[i]);
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free(cfg->confdetails[i]);
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}
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if (config.size > 0) {
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free(config.confdetails);
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if (cfg->size > 0) {
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free(cfg->confdetails);
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}
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config.size = 0;
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cfg->size = 0;
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}
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/**
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@ -133,8 +121,8 @@ int check_configuration_permissions(const char* file_name) {
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return 0;
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}
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//function used to load the configurations present in the secure config
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void read_config(const char* file_name) {
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void read_config(const char* file_name, struct configuration *cfg) {
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FILE *conf_file;
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char *line;
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char *equaltok;
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@ -152,9 +140,9 @@ void read_config(const char* file_name) {
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#endif
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//allocate space for ten configuration items.
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config.confdetails = (struct confentry **) malloc(sizeof(struct confentry *)
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cfg->confdetails = (struct confentry **) malloc(sizeof(struct confentry *)
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* MAX_SIZE);
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config.size = 0;
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cfg->size = 0;
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conf_file = fopen(file_name, "r");
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if (conf_file == NULL) {
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fprintf(ERRORFILE, "Invalid conf file provided : %s \n", file_name);
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@ -196,9 +184,9 @@ void read_config(const char* file_name) {
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free(line);
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continue;
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}
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config.confdetails[config.size] = (struct confentry *) malloc(
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cfg->confdetails[cfg->size] = (struct confentry *) malloc(
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sizeof(struct confentry));
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if(config.confdetails[config.size] == NULL) {
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if(cfg->confdetails[cfg->size] == NULL) {
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fprintf(LOGFILE,
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"Failed allocating memory for single configuration item\n");
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goto cleanup;
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@ -208,10 +196,10 @@ void read_config(const char* file_name) {
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fprintf(LOGFILE, "read_config : Adding conf key : %s \n", equaltok);
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#endif
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memset(config.confdetails[config.size], 0, sizeof(struct confentry));
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config.confdetails[config.size]->key = (char *) malloc(
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memset(cfg->confdetails[cfg->size], 0, sizeof(struct confentry));
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cfg->confdetails[cfg->size]->key = (char *) malloc(
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sizeof(char) * (strlen(equaltok)+1));
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strcpy((char *)config.confdetails[config.size]->key, equaltok);
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strcpy((char *)cfg->confdetails[cfg->size]->key, equaltok);
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equaltok = strtok_r(NULL, "=", &temp_equaltok);
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if (equaltok == NULL) {
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fprintf(LOGFILE, "configuration tokenization failed \n");
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@ -220,8 +208,8 @@ void read_config(const char* file_name) {
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//means value is commented so don't store the key
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if(equaltok[0] == '#') {
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free(line);
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free((void *)config.confdetails[config.size]->key);
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free(config.confdetails[config.size]);
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free((void *)cfg->confdetails[cfg->size]->key);
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free(cfg->confdetails[cfg->size]);
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continue;
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}
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@ -229,27 +217,29 @@ void read_config(const char* file_name) {
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fprintf(LOGFILE, "read_config : Adding conf value : %s \n", equaltok);
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#endif
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config.confdetails[config.size]->value = (char *) malloc(
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cfg->confdetails[cfg->size]->value = (char *) malloc(
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sizeof(char) * (strlen(equaltok)+1));
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strcpy((char *)config.confdetails[config.size]->value, equaltok);
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if((config.size + 1) % MAX_SIZE == 0) {
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config.confdetails = (struct confentry **) realloc(config.confdetails,
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sizeof(struct confentry **) * (MAX_SIZE + config.size));
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if (config.confdetails == NULL) {
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strcpy((char *)cfg->confdetails[cfg->size]->value, equaltok);
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if((cfg->size + 1) % MAX_SIZE == 0) {
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cfg->confdetails = (struct confentry **) realloc(cfg->confdetails,
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sizeof(struct confentry **) * (MAX_SIZE + cfg->size));
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if (cfg->confdetails == NULL) {
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fprintf(LOGFILE,
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"Failed re-allocating memory for configuration items\n");
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goto cleanup;
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}
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}
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if(config.confdetails[config.size] )
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config.size++;
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if(cfg->confdetails[cfg->size]) {
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cfg->size++;
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}
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free(line);
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}
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//close the file
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fclose(conf_file);
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if (config.size == 0) {
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if (cfg->size == 0) {
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fprintf(ERRORFILE, "Invalid configuration provided in %s\n", file_name);
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exit(INVALID_CONFIG_FILE);
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}
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@ -262,7 +252,7 @@ void read_config(const char* file_name) {
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free(line);
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}
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fclose(conf_file);
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free_configurations();
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free_configurations(cfg);
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return;
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}
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@ -272,11 +262,11 @@ void read_config(const char* file_name) {
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* array, next time onwards used the populated array.
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*
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*/
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char * get_value(const char* key) {
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char * get_value(const char* key, struct configuration *cfg) {
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int count;
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for (count = 0; count < config.size; count++) {
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if (strcmp(config.confdetails[count]->key, key) == 0) {
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return strdup(config.confdetails[count]->value);
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for (count = 0; count < cfg->size; count++) {
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if (strcmp(cfg->confdetails[count]->key, key) == 0) {
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return strdup(cfg->confdetails[count]->value);
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}
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}
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return NULL;
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@ -286,11 +276,21 @@ char * get_value(const char* key) {
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* Function to return an array of values for a key.
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* Value delimiter is assumed to be a ','.
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*/
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char ** get_values(const char * key) {
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char *value = get_value(key);
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char ** get_values(const char * key, struct configuration *cfg) {
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char *value = get_value(key, cfg);
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return extract_values_delim(value, ",");
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}
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/**
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* Function to return an array of values for a key, using the specified
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delimiter.
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*/
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char ** get_values_delim(const char * key, struct configuration *cfg,
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const char *delim) {
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char *value = get_value(key, cfg);
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return extract_values_delim(value, delim);
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}
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char ** extract_values_delim(char *value, const char *delim) {
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char ** toPass = NULL;
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char *tempTok = NULL;
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@ -37,15 +37,33 @@ int check_configuration_permissions(const char* file_name);
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*/
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char *resolve_config_path(const char* file_name, const char *root);
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// read the given configuration file
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void read_config(const char* config_file);
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// Config data structures.
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struct confentry {
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const char *key;
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const char *value;
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};
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struct configuration {
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int size;
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struct confentry **confdetails;
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};
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// read the given configuration file into the specified config struct.
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void read_config(const char* config_file, struct configuration *cfg);
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//method exposed to get the configurations
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char *get_value(const char* key);
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char *get_value(const char* key, struct configuration *cfg);
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//function to return array of values pointing to the key. Values are
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//comma seperated strings.
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char ** get_values(const char* key);
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char ** get_values(const char* key, struct configuration *cfg);
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/**
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* Function to return an array of values for a key, using the specified
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delimiter.
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*/
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char ** get_values_delim(const char * key, struct configuration *cfg,
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const char *delim);
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// Extracts array of values from the comma separated list of values.
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char ** extract_values(char *value);
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@ -56,7 +74,7 @@ char ** extract_values_delim(char *value, const char *delim);
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void free_values(char** values);
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//method to free allocated configuration
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void free_configurations();
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void free_configurations(struct configuration *cfg);
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/**
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* If str is a string of the form key=val, find 'key'
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@ -59,6 +59,8 @@ FILE* ERRORFILE = NULL;
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static uid_t nm_uid = -1;
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static gid_t nm_gid = -1;
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struct configuration executor_cfg = {.size=0, .confdetails=NULL};
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char *concatenate(char *concat_pattern, char *return_path_name,
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int numArgs, ...);
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@ -67,6 +69,21 @@ void set_nm_uid(uid_t user, gid_t group) {
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nm_gid = group;
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}
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//function used to load the configurations present in the secure config
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void read_executor_config(const char* file_name) {
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read_config(file_name, &executor_cfg);
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}
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//function used to free executor configuration data
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void free_executor_configurations() {
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free_configurations(&executor_cfg);
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}
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//Lookup nodemanager group from container executor configuration.
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char *get_nodemanager_group() {
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return get_value(NM_GROUP_KEY, &executor_cfg);
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}
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/**
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* get the executable filename.
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*/
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@ -658,7 +675,7 @@ static struct passwd* get_user_info(const char* user) {
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}
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int is_whitelisted(const char *user) {
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char **whitelist = get_values(ALLOWED_SYSTEM_USERS_KEY);
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char **whitelist = get_values(ALLOWED_SYSTEM_USERS_KEY, &executor_cfg);
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char **users = whitelist;
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if (whitelist != NULL) {
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for(; *users; ++users) {
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@ -686,7 +703,7 @@ struct passwd* check_user(const char *user) {
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fflush(LOGFILE);
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return NULL;
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}
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char *min_uid_str = get_value(MIN_USERID_KEY);
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char *min_uid_str = get_value(MIN_USERID_KEY, &executor_cfg);
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int min_uid = DEFAULT_MIN_USERID;
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if (min_uid_str != NULL) {
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char *end_ptr = NULL;
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@ -713,7 +730,7 @@ struct passwd* check_user(const char *user) {
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free(user_info);
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return NULL;
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}
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char **banned_users = get_values(BANNED_USERS_KEY);
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char **banned_users = get_values(BANNED_USERS_KEY, &executor_cfg);
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banned_users = banned_users == NULL ?
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(char**) DEFAULT_BANNED_USERS : banned_users;
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char **banned_user = banned_users;
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@ -1062,7 +1079,7 @@ char* parse_docker_command_file(const char* command_file) {
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int run_docker(const char *command_file) {
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char* docker_command = parse_docker_command_file(command_file);
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char* docker_binary = get_value(DOCKER_BINARY_KEY);
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char* docker_binary = get_value(DOCKER_BINARY_KEY, &executor_cfg);
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char* docker_command_with_binary = calloc(sizeof(char), EXECUTOR_PATH_MAX);
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snprintf(docker_command_with_binary, EXECUTOR_PATH_MAX, "%s %s", docker_binary, docker_command);
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char **args = extract_values_delim(docker_command_with_binary, " ");
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@ -1224,7 +1241,7 @@ int launch_docker_container_as_user(const char * user, const char *app_id,
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char buffer[BUFFER_SIZE];
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char *docker_command = parse_docker_command_file(command_file);
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char *docker_binary = get_value(DOCKER_BINARY_KEY);
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char *docker_binary = get_value(DOCKER_BINARY_KEY, &executor_cfg);
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if (docker_binary == NULL) {
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docker_binary = "docker";
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}
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@ -95,10 +95,15 @@ extern FILE *LOGFILE;
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// the log file for error messages
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extern FILE *ERRORFILE;
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// get the executable's filename
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char* get_executable();
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//function used to load the configurations present in the secure config
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void read_executor_config(const char* file_name);
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//Lookup nodemanager group from container executor configuration.
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char *get_nodemanager_group();
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/**
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* Check the permissions on the container-executor to make sure that security is
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* permissible. For this, we need container-executor binary to
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@ -111,6 +116,12 @@ char* get_executable();
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*/
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int check_executor_permissions(char *executable_file);
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//function used to load the configurations present in the secure config.
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void read_executor_config(const char* file_name);
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//function used to free executor configuration data
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void free_executor_configurations();
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// initialize the application directory
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int initialize_app(const char *user, const char *app_id,
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const char *credentials, char* const* local_dirs,
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@ -112,11 +112,11 @@ static void assert_valid_setup(char *current_executable) {
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flush_and_close_log_files();
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exit(INVALID_CONFIG_FILE);
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}
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read_config(conf_file);
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read_executor_config(conf_file);
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free(conf_file);
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// look up the node manager group in the config file
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char *nm_group = get_value(NM_GROUP_KEY);
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char *nm_group = get_nodemanager_group();
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if (nm_group == NULL) {
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fprintf(ERRORFILE, "Can't get configured value for %s.\n", NM_GROUP_KEY);
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flush_and_close_log_files();
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@ -873,7 +873,7 @@ int main(int argc, char **argv) {
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if (write_config_file(TEST_ROOT "/test.cfg", 1) != 0) {
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exit(1);
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}
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read_config(TEST_ROOT "/test.cfg");
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read_executor_config(TEST_ROOT "/test.cfg");
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local_dirs = extract_values(strdup(NM_LOCAL_DIRS));
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log_dirs = extract_values(strdup(NM_LOG_DIRS));
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seteuid(0);
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// test_delete_user must run as root since that's how we use the delete_as_user
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test_delete_user();
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free_configurations();
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free_executor_configurations();
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printf("\nTrying banned default user()\n");
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if (write_config_file(TEST_ROOT "/test.cfg", 0) != 0) {
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exit(1);
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}
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read_config(TEST_ROOT "/test.cfg");
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read_executor_config(TEST_ROOT "/test.cfg");
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username = "bin";
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test_check_user(1);
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@ -963,6 +963,6 @@ int main(int argc, char **argv) {
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printf("\nFinished tests\n");
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free(current_username);
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free_configurations();
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free_executor_configurations();
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return 0;
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}
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