519 lines
13 KiB
C
519 lines
13 KiB
C
/*
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* Copyright 1987, 1988 by the Massachusetts Institute of Technology.
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*
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* For copying and distribution information, please see the file
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* <mit-copyright.h>.
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*
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* Kerberos database manipulation utility. This program allows you to
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* dump a kerberos database to an ascii readable file and load this
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* file into the database. Read locking of the database is done during a
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* dump operation. NO LOCKING is done during a load operation. Loads
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* should happen with other processes shutdown.
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*
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* Written July 9, 1987 by Jeffrey I. Schiller
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*/
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#include "adm_locl.h"
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RCSID("$Id: kdb_util.c,v 1.42 1999/09/16 20:37:21 assar Exp $");
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static des_cblock master_key, new_master_key;
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static des_key_schedule master_key_schedule, new_master_key_schedule;
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/* cv_key is a procedure which takes a principle and changes its key,
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either for a new method of encrypting the keys, or a new master key.
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if cv_key is null no transformation of key is done (other than net byte
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order). */
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struct callback_args {
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void (*cv_key)(Principal *);
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FILE *output_file;
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};
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static void
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print_time(FILE *file, time_t timeval)
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{
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struct tm *tm;
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tm = gmtime(&timeval);
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fprintf(file, " %04d%02d%02d%02d%02d",
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tm->tm_year + 1900,
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tm->tm_mon + 1,
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tm->tm_mday,
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tm->tm_hour,
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tm->tm_min);
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}
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static long
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time_explode(char *cp)
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{
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char wbuf[5];
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struct tm tp;
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int local;
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memset(&tp, 0, sizeof(tp)); /* clear out the struct */
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if (strlen(cp) > 10) { /* new format */
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strlcpy(wbuf, cp, sizeof(wbuf));
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tp.tm_year = atoi(wbuf) - 1900;
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cp += 4; /* step over the year */
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local = 0; /* GMT */
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} else { /* old format: local time,
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year is 2 digits, assuming 19xx */
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wbuf[0] = *cp++;
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wbuf[1] = *cp++;
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wbuf[2] = 0;
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tp.tm_year = atoi(wbuf);
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local = 1; /* local */
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}
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wbuf[0] = *cp++;
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wbuf[1] = *cp++;
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wbuf[2] = 0;
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tp.tm_mon = atoi(wbuf)-1;
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wbuf[0] = *cp++;
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wbuf[1] = *cp++;
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tp.tm_mday = atoi(wbuf);
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wbuf[0] = *cp++;
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wbuf[1] = *cp++;
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tp.tm_hour = atoi(wbuf);
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wbuf[0] = *cp++;
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wbuf[1] = *cp++;
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tp.tm_min = atoi(wbuf);
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return(tm2time(tp, local));
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}
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static int
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dump_db_1(void *arg,
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Principal *principal) /* replace null strings with "*" */
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{
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struct callback_args *a = (struct callback_args *)arg;
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if (principal->instance[0] == '\0') {
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principal->instance[0] = '*';
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principal->instance[1] = '\0';
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}
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if (principal->mod_name[0] == '\0') {
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principal->mod_name[0] = '*';
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principal->mod_name[1] = '\0';
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}
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if (principal->mod_instance[0] == '\0') {
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principal->mod_instance[0] = '*';
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principal->mod_instance[1] = '\0';
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}
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if (a->cv_key != NULL) {
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(*a->cv_key) (principal);
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}
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fprintf(a->output_file, "%s %s %d %d %d %d %x %x",
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principal->name,
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principal->instance,
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principal->max_life,
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principal->kdc_key_ver,
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principal->key_version,
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principal->attributes,
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(int)htonl (principal->key_low),
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(int)htonl (principal->key_high));
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print_time(a->output_file, principal->exp_date);
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print_time(a->output_file, principal->mod_date);
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fprintf(a->output_file, " %s %s\n",
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principal->mod_name,
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principal->mod_instance);
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return 0;
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}
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static int
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dump_db (char *db_file, FILE *output_file, void (*cv_key) (Principal *))
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{
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struct callback_args a;
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a.cv_key = cv_key;
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a.output_file = output_file;
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kerb_db_iterate (dump_db_1, &a);
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return fflush(output_file);
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}
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static int
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add_file(void *db, FILE *file)
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{
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int ret;
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int lineno = 0;
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char line[1024];
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unsigned long key[2]; /* yes, long */
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Principal pr;
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char exp_date[64], mod_date[64];
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int life, kkvno, kvno;
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while(1){
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memset(&pr, 0, sizeof(pr));
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errno = 0;
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if(fgets(line, sizeof(line), file) == NULL){
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if(errno != 0)
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err (1, "fgets");
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break;
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}
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lineno++;
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ret = sscanf(line, "%s %s %d %d %d %hd %lx %lx %s %s %s %s",
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pr.name, pr.instance,
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&life, &kkvno, &kvno,
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&pr.attributes,
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&key[0], &key[1],
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exp_date, mod_date,
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pr.mod_name, pr.mod_instance);
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if(ret != 12){
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warnx("Line %d malformed (ignored)", lineno);
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continue;
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}
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pr.key_low = ntohl (key[0]);
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pr.key_high = ntohl (key[1]);
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pr.max_life = life;
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pr.kdc_key_ver = kkvno;
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pr.key_version = kvno;
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pr.exp_date = time_explode(exp_date);
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pr.mod_date = time_explode(mod_date);
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if (pr.instance[0] == '*')
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pr.instance[0] = 0;
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if (pr.mod_name[0] == '*')
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pr.mod_name[0] = 0;
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if (pr.mod_instance[0] == '*')
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pr.mod_instance[0] = 0;
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if (kerb_db_update(db, &pr, 1) != 1) {
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warn ("store %s.%s aborted",
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pr.name, pr.instance);
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return 1;
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}
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}
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return 0;
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}
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static void
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load_db (char *db_file, FILE *input_file)
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{
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long *db;
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int code;
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char *temp_db_file;
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asprintf (&temp_db_file, "%s~", db_file);
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if(temp_db_file == NULL)
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errx (1, "out of memory");
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/* Create the database */
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if ((code = kerb_db_create(temp_db_file)) != 0)
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err (1, "creating temp database %s", temp_db_file);
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kerb_db_set_name(temp_db_file);
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db = kerb_db_begin_update();
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if (db == NULL)
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err (1, "opening temp database %s", temp_db_file);
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if(add_file(db, input_file))
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errx (1, "Load aborted");
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kerb_db_end_update(db);
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if ((code = kerb_db_rename(temp_db_file, db_file)) != 0)
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warn("database rename failed");
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fclose(input_file);
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free(temp_db_file);
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}
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static void
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merge_db(char *db_file, FILE *input_file)
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{
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void *db;
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db = kerb_db_begin_update();
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if(db == NULL)
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err (1, "Couldn't open database");
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if(add_file(db, input_file))
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errx (1, "Merge aborted");
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kerb_db_end_update(db);
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}
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static void
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update_ok_file (char *file_name)
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{
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/* handle slave locking/failure stuff */
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char *file_ok;
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int fd;
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asprintf (&file_ok, "%s.dump_ok", file_name);
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if (file_ok == NULL)
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errx (1, "out of memory");
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if ((fd = open(file_ok, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0)
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err (1, "Error creating %s", file_ok);
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free(file_ok);
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close(fd);
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/*
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* Some versions of BSD don't update the mtime in the above open so
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* we call utimes just in case.
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*/
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if (utime(file_name, NULL) < 0)
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err (1, "utime %s", file_name);
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}
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static void
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convert_key_new_master (Principal *p)
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{
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des_cblock key;
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/* leave null keys alone */
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if ((p->key_low == 0) && (p->key_high == 0)) return;
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/* move current key to des_cblock for encryption, special case master key
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since that's changing */
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if ((strncmp (p->name, KERB_M_NAME, ANAME_SZ) == 0) &&
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(strncmp (p->instance, KERB_M_INST, INST_SZ) == 0)) {
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memcpy (key, new_master_key, sizeof(des_cblock));
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(p->key_version)++;
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} else {
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copy_to_key(&p->key_low, &p->key_high, key);
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kdb_encrypt_key (&key, &key, &master_key,
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master_key_schedule, DES_DECRYPT);
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}
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kdb_encrypt_key (&key, &key, &new_master_key,
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new_master_key_schedule, DES_ENCRYPT);
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copy_from_key(key, &(p->key_low), &(p->key_high));
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memset(key, 0, sizeof (key)); /* a little paranoia ... */
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(p->kdc_key_ver)++;
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}
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static void
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clear_secrets (void)
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{
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memset(master_key, 0, sizeof (des_cblock));
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memset(master_key_schedule, 0, sizeof (des_key_schedule));
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memset(new_master_key, 0, sizeof (des_cblock));
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memset(new_master_key_schedule, 0, sizeof (des_key_schedule));
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}
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static void
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convert_new_master_key (char *db_file, FILE *out)
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{
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#ifdef RANDOM_MKEY
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errx (1, "Sorry, this function is not available with "
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"the new master key scheme.");
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#else
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printf ("\n\nEnter the CURRENT master key.");
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if (kdb_get_master_key (KDB_GET_PROMPT, &master_key,
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master_key_schedule) != 0) {
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clear_secrets ();
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errx (1, "Couldn't get master key.");
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}
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if (kdb_verify_master_key (&master_key, master_key_schedule, stderr) < 0) {
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clear_secrets ();
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exit (1);
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}
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printf ("\n\nNow enter the NEW master key. Do not forget it!!");
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if (kdb_get_master_key (KDB_GET_TWICE, &new_master_key,
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new_master_key_schedule) != 0) {
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clear_secrets ();
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errx (1, "Couldn't get new master key.");
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}
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dump_db (db_file, out, convert_key_new_master);
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{
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char *fname;
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asprintf(&fname, "%s.new", MKEYFILE);
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if(fname == NULL) {
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clear_secrets();
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errx(1, "malloc: failed");
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}
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kdb_kstash(&new_master_key, fname);
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free(fname);
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}
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#endif /* RANDOM_MKEY */
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}
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static void
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convert_key_old_db (Principal *p)
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{
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des_cblock key;
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/* leave null keys alone */
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if ((p->key_low == 0) && (p->key_high == 0)) return;
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copy_to_key(&p->key_low, &p->key_high, key);
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#ifndef NOENCRYPTION
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des_pcbc_encrypt((des_cblock *)key,(des_cblock *)key,
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(long)sizeof(des_cblock),master_key_schedule,
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(des_cblock *)master_key_schedule, DES_DECRYPT);
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#endif
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/* make new key, new style */
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kdb_encrypt_key (&key, &key, &master_key, master_key_schedule, DES_ENCRYPT);
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copy_from_key(key, &(p->key_low), &(p->key_high));
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memset(key, 0, sizeof (key)); /* a little paranoia ... */
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}
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static void
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convert_old_format_db (char *db_file, FILE *out)
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{
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des_cblock key_from_db;
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Principal principal_data[1];
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int n, more;
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if (kdb_get_master_key (KDB_GET_PROMPT, &master_key,
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master_key_schedule) != 0L) {
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clear_secrets();
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errx (1, "Couldn't get master key.");
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}
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/* can't call kdb_verify_master_key because this is an old style db */
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/* lookup the master key version */
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n = kerb_get_principal(KERB_M_NAME, KERB_M_INST, principal_data,
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1 /* only one please */, &more);
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if ((n != 1) || more)
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errx (1, "verify_master_key: Kerberos error on master key lookup, %d found.\n", n);
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/* set up the master key */
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fprintf(stderr, "Current Kerberos master key version is %d.\n",
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principal_data[0].kdc_key_ver);
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/*
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* now use the master key to decrypt (old style) the key in the db, had better
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* be the same!
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*/
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copy_to_key(&principal_data[0].key_low,
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&principal_data[0].key_high,
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key_from_db);
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#ifndef NOENCRYPTION
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des_pcbc_encrypt(&key_from_db,&key_from_db,(long)sizeof(key_from_db),
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master_key_schedule,(des_cblock *)master_key_schedule, DES_DECRYPT);
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#endif
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/* the decrypted database key had better equal the master key */
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n = memcmp(master_key, key_from_db, sizeof(master_key));
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memset(key_from_db, 0, sizeof(key_from_db));
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if (n) {
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fprintf(stderr, "\n\07\07verify_master_key: Invalid master key, ");
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fprintf(stderr, "does not match database.\n");
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exit (1);
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}
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fprintf(stderr, "Master key verified.\n");
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dump_db (db_file, out, convert_key_old_db);
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}
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int
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main(int argc, char **argv)
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{
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int ret;
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FILE *file;
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enum {
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OP_LOAD,
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OP_MERGE,
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OP_DUMP,
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OP_SLAVE_DUMP,
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OP_NEW_MASTER,
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OP_CONVERT_OLD_DB
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} op;
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char *file_name;
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char *db_name;
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set_progname (argv[0]);
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if (argc != 3 && argc != 4) {
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fprintf(stderr, "Usage: %s operation file [database name].\n",
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argv[0]);
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fprintf(stderr, "Operation is one of: "
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"load, merge, dump, slave_dump, new_master_key, "
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"convert_old_db\n");
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fprintf(stderr, "use file `-' for stdout\n");
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exit(1);
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}
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if (argc == 3)
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db_name = DBM_FILE;
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else
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db_name = argv[3];
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ret = kerb_db_set_name (db_name);
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/* this makes starting slave servers ~14.3 times easier */
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if(ret && strcmp(argv[1], "load") == 0)
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ret = kerb_db_create (db_name);
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if(ret)
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err (1, "Can't open database");
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if (!strcmp(argv[1], "load"))
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op = OP_LOAD;
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else if (!strcmp(argv[1], "merge"))
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op = OP_MERGE;
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else if (!strcmp(argv[1], "dump"))
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op = OP_DUMP;
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else if (!strcmp(argv[1], "slave_dump"))
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op = OP_SLAVE_DUMP;
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else if (!strcmp(argv[1], "new_master_key"))
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op = OP_NEW_MASTER;
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else if (!strcmp(argv[1], "convert_old_db"))
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op = OP_CONVERT_OLD_DB;
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else {
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warnx ("%s is an invalid operation.", argv[1]);
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warnx ("Valid operations are \"load\", \"merge\", "
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"\"dump\", \"slave_dump\", \"new_master_key\", "
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"and \"convert_old_db\"");
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return 1;
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}
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file_name = argv[2];
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if (strcmp (file_name, "-") == 0
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&& op != OP_LOAD
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&& op != OP_MERGE)
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file = stdout;
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else {
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char *mode;
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if (op == OP_LOAD || op == OP_MERGE)
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mode = "r";
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else
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mode = "w";
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file = fopen (file_name, mode);
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}
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if (file == NULL)
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err (1, "open %s", argv[2]);
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switch (op) {
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case OP_DUMP:
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if ((dump_db (db_name, file, (void (*)(Principal *)) 0) == EOF) ||
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(fclose(file) == EOF))
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err (1, "%s", file_name);
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break;
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case OP_SLAVE_DUMP:
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if ((dump_db (db_name, file, (void (*)(Principal *)) 0) == EOF) ||
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(fclose(file) == EOF))
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err (1, "%s", file_name);
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update_ok_file (file_name);
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break;
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case OP_LOAD:
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load_db (db_name, file);
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break;
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case OP_MERGE:
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merge_db (db_name, file);
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break;
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case OP_NEW_MASTER:
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convert_new_master_key (db_name, file);
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printf("Don't forget to do a `kdb_util load %s' to reload the database!\n", file_name);
|
|
break;
|
|
case OP_CONVERT_OLD_DB:
|
|
convert_old_format_db (db_name, file);
|
|
printf("Don't forget to do a `kdb_util load %s' to reload the database!\n", file_name);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|