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/* daemon/keydb.c
*
* Entropy key keys database handling.
*
* Copyright 2009 Simtec Electronics
*
* For licence terms refer to the COPYING file.
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include "keydb.h"
#include "pem.h"
/** Keyring entry. */
struct snum_to_key_s {
struct snum_to_key_s *next; /**< Next entry. */
uint8_t snum[12]; /**< Serial number. */
uint8_t ltkey[32]; /**< Long term session key. */
};
static struct snum_to_key_s *ents = NULL;
/** Find a long term saession key from a serial number.
*
* @param snum The serial number to find the key for.
* @return The keyring entry or NULL if no matching serial number is found.
*/
static struct snum_to_key_s *
find_ltkey(const uint8_t *snum)
{
struct snum_to_key_s *ent = ents;
while (ent != NULL) {
if (memcmp(ent->snum, snum, 12) == 0)
break;
ent = ent->next;
}
return ent;
}
/* exported interface documented in keydb.h */
uint8_t *
snum_to_ltkey(const uint8_t *snum)
{
struct snum_to_key_s *ent;
uint8_t *key = NULL;
ent = find_ltkey(snum);
if (ent != NULL) {
key = malloc(32);
if (key != NULL) {
memcpy(key, ent->ltkey, 32);
}
}
return key;
}
/* exported interface documented in keydb.h */
int
output_key(FILE *fh, const uint8_t *snum, const uint8_t *ltkey)
{
uint8_t data[128];
pem64_encode_bytes(snum, 12, (char *)data);
data[16] = ' ';
pem64_encode_bytes(ltkey, 32, (char *)data + 17);
data[61] = 0;
return fprintf(fh, "%s\n", data);
}
/* exported interface documented in keydb.h */
int
add_ltkey(const uint8_t *snum, const uint8_t *ltkey)
{
struct snum_to_key_s *ent;
ent = find_ltkey(snum);
if (ent == NULL) {
/* no current entry for that serial number */
ent = calloc(1, sizeof(struct snum_to_key_s));
memcpy(ent->snum, snum, 12);
ent->next = ents;
ents = ent;
}
memcpy(ent->ltkey, ltkey, 32);
return 0;
}
/* exported interface documented in keydb.h */
int
write_keyring(const char *fname)
{
int fd;
FILE *fh;
struct snum_to_key_s *base = ents;
char *fname2 = malloc(strlen(fname) + 5);
strcpy(fname2, fname);
strcat(fname2, ".tmp");
fd = open(fname2, O_CREAT | O_EXCL | O_WRONLY, 0600);
if (fd == -1) {
/* Unable to open keyring */
perror("open");
free(fname2);
return -1;
}
fh = fdopen(fd, "w");
if (fh == NULL) {
free(fname2);
close(fd);
return -1;
}
fprintf(fh, "# Do not edit this directly, this file is managed by ekey-setkey\n");
while (base) {
output_key(fh, base->snum, base->ltkey);
base = base->next;
}
fflush(fh);
fclose(fh);
if (rename(fname2, fname) == -1) {
perror("rename");
free(fname2);
unlink(fname2);
return -1;
}
free(fname2);
return 0;
}
/* exported interface documented in keydb.h */
int
read_keyring(const char *fname)
{
FILE *fh;
char line[512];
char snumpem[17];
char ltkeypem[45];
int res;
int keys = 0;
uint8_t snum[12];
uint8_t ltkey[33];
struct snum_to_key_s *base = ents;
fh = fopen(fname, "r");
if (fh == NULL) {
/* Unable to open keyring */
return -1;
}
/* Blow the old keyring out of the water */
while (base) {
struct snum_to_key_s *next = base->next;
free(base);
base = next;
}
ents = NULL;
while (fgets(line, 512, fh) != NULL) {
res = sscanf(line,
" %16[A-Za-z0-9+/=] %44[A-Za-z0-9+/=]",
snumpem,
ltkeypem);
if (res == 2) {
pem64_decode_bytes(snumpem, 16, snum);
pem64_decode_bytes(ltkeypem, 44, ltkey);
add_ltkey(snum, ltkey);
keys++;
}
}
fclose(fh);
return keys;
}
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