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#include <errno.h>
#include <stdio.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include "apk_defines.h"
#include "apk_trust.h"
#include "apk_io.h"
/* Trust */
int apk_pkey_init(struct apk_pkey *pkey, EVP_PKEY *key)
{
unsigned char dig[EVP_MAX_MD_SIZE], *pub = NULL;
unsigned int dlen = sizeof dig;
int len;
if ((len = i2d_PublicKey(key, &pub)) < 0) return -EIO;
EVP_Digest(pub, len, dig, &dlen, EVP_sha512(), NULL);
memcpy(pkey->id, dig, sizeof pkey->id);
OPENSSL_free(pub);
pkey->key = key;
return 0;
}
void apk_pkey_free(struct apk_pkey *pkey)
{
EVP_PKEY_free(pkey->key);
}
int apk_pkey_load(struct apk_pkey *pkey, int dirfd, const char *fn)
{
EVP_PKEY *key;
BIO *bio;
int fd;
fd = openat(dirfd, fn, O_RDONLY|O_CLOEXEC);
if (fd < 0) return -errno;
bio = BIO_new_fp(fdopen(fd, "r"), BIO_CLOSE);
if (!bio) return -ENOMEM;
key = PEM_read_bio_PUBKEY(bio, NULL, NULL, NULL);
if (!key) {
BIO_reset(bio);
key = PEM_read_bio_PrivateKey(bio, NULL, NULL, NULL);
}
ERR_clear_error();
BIO_free(bio);
if (!key) return -EBADMSG;
apk_pkey_init(pkey, key);
return 0;
}
static struct apk_trust_key *apk_trust_load_key(int dirfd, const char *filename)
{
struct apk_trust_key *key;
int r;
key = calloc(1, sizeof *key);
if (!key) return ERR_PTR(-ENOMEM);
r = apk_pkey_load(&key->key, dirfd, filename);
if (r) {
free(key);
return ERR_PTR(-ENOKEY);
}
list_init(&key->key_node);
key->filename = strdup(filename);
return key;
}
static int __apk_trust_load_pubkey(void *pctx, int dirfd, const char *filename)
{
struct apk_trust *trust = pctx;
struct apk_trust_key *key = apk_trust_load_key(dirfd, filename);
if (!IS_ERR(key))
list_add_tail(&key->key_node, &trust->trusted_key_list);
return 0;
}
int apk_trust_init(struct apk_trust *trust, int dirfd, struct apk_string_array *pkey_files)
{
char **fn;
*trust = (struct apk_trust){
.mdctx = EVP_MD_CTX_new(),
};
if (!trust->mdctx) return -ENOMEM;
EVP_MD_CTX_set_flags(trust->mdctx, EVP_MD_CTX_FLAG_FINALISE);
list_init(&trust->trusted_key_list);
list_init(&trust->private_key_list);
apk_dir_foreach_file(dirfd, __apk_trust_load_pubkey, trust);
foreach_array_item(fn, pkey_files) {
struct apk_trust_key *key = apk_trust_load_key(AT_FDCWD, *fn);
if (IS_ERR(key)) return PTR_ERR(key);
list_add_tail(&key->key_node, &trust->private_key_list);
}
return 0;
}
static void __apk_trust_free_keys(struct list_head *h)
{
struct apk_trust_key *tkey, *n;
list_for_each_entry_safe(tkey, n, h, key_node) {
list_del(&tkey->key_node);
apk_pkey_free(&tkey->key);
free(tkey->filename);
free(tkey);
}
}
void apk_trust_free(struct apk_trust *trust)
{
if (!trust->mdctx) return;
__apk_trust_free_keys(&trust->trusted_key_list);
__apk_trust_free_keys(&trust->private_key_list);
EVP_MD_CTX_free(trust->mdctx);
}
struct apk_pkey *apk_trust_key_by_name(struct apk_trust *trust, const char *filename)
{
struct apk_trust_key *tkey;
list_for_each_entry(tkey, &trust->trusted_key_list, key_node)
if (tkey->filename && strcmp(tkey->filename, filename) == 0)
return &tkey->key;
return NULL;
}
/* Command group for signing */
#include "apk_applet.h"
#define SIGNING_OPTIONS(OPT) \
OPT(OPT_SIGN_sign_key, APK_OPT_ARG "sign-key")
APK_OPT_GROUP(options_signing, "Signing", SIGNING_OPTIONS);
static int option_parse_signing(void *ctx, struct apk_ctx *ac, int optch, const char *optarg)
{
switch (optch) {
case OPT_SIGN_sign_key:
*apk_string_array_add(&ac->private_keys) = (char*) optarg;
break;
default:
return -ENOTSUP;
}
return 0;
}
const struct apk_option_group optgroup_signing = {
.desc = options_signing,
.parse = option_parse_signing,
};
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