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Env vars SERVAL_KEYRING_PATH and SERVAL_KEYRING_READONLY

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To support release signing operations without having to copy the release
keyring from its USB stick (into an instance directory), and reducing
the risk of corrupting the release keyring file while using it in-place.
This commit is contained in:
Andrew Bettison 2013-08-29 17:33:39 +09:30
parent 7d30b3cce7
commit 3b1ae5cbb0
2 changed files with 49 additions and 28 deletions
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75
keyring.c
View File

@ -28,37 +28,47 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include "nacl.h"
#include "overlay_address.h"
static int _keyring_open(keyring_file *k, const char *path, const char *mode)
{
if (config.debug.keyring)
DEBUGF("opening %s in \"%s\" mode", alloca_str_toprint(path), mode);
k->file = fopen(path, mode);
if (!k->file) {
if (errno != EPERM && errno != ENOENT)
return WHYF_perror("fopen(%s, \"%s\")", alloca_str_toprint(path), mode);
if (config.debug.keyring)
DEBUGF("cannot open %s in \"%s\" mode", alloca_str_toprint(path), mode);
}
return 0;
}
/*
Open keyring file, read BAM and create initial context using the
stored salt. */
keyring_file *keyring_open(const char *path)
* Open keyring file, read BAM and create initial context using the stored salt.
*/
keyring_file *keyring_open(const char *path, int writeable)
{
/* Allocate structure */
keyring_file *k = emalloc_zero(sizeof(keyring_file));
if (!k)
return NULL;
/* Open keyring file read-write if we can, else use it read-only */
k->file = fopen(path, "r+");
if (!k->file) {
if (errno != EPERM && errno != ENOENT)
WHYF_perror("fopen(%s, \"r+\")", alloca_str_toprint(path));
if (config.debug.keyring)
DEBUGF("cannot open %s in \"r+\" mode, falling back to \"r\"", alloca_str_toprint(path));
k->file = fopen(path, "r");
if (!k->file) {
if (errno != EPERM && errno != ENOENT)
WHYF_perror("fopen(%s, \"r\")", alloca_str_toprint(path));
if (config.debug.keyring)
DEBUGF("cannot open %s in \"r\" mode, falling back to \"w+\"", alloca_str_toprint(path));
k->file = fopen(path, "w+");
if (!k->file) {
WHYF_perror("fopen(%s, \"w+\")", alloca_str_toprint(path));
keyring_free(k);
return NULL;
}
}
/* Open keyring file read-write if we can, else use it read-only, else create it. */
if (writeable && _keyring_open(k, path, "r+") == -1) {
keyring_free(k);
return NULL;
}
if (!k->file && _keyring_open(k, path, "r") == -1) {
keyring_free(k);
return NULL;
}
if (!k->file && writeable && _keyring_open(k, path, "w+") == -1) {
keyring_free(k);
return NULL;
}
if (!k->file) {
WHYF_perror("cannot open or create keyring file %s", alloca_str_toprint(path));
keyring_free(k);
return NULL;
}
assert(k->file != NULL);
if (fseeko(k->file, 0, SEEK_END)) {
WHYF_perror("fseeko(%s, 0, SEEK_END)", alloca_str_toprint(path));
keyring_free(k);
@ -1489,10 +1499,21 @@ keyring_file *keyring_open_instance()
IN();
if (create_serval_instance_dir() == -1)
RETURN(NULL);
// Work out the absolute path to the keyring file.
const char *keyringpath = getenv("SERVAL_KEYRING_PATH");
char keyringFile[1024];
if (!FORM_SERVAL_INSTANCE_PATH(keyringFile, "serval.keyring"))
RETURN(NULL);
if ((k = keyring_open(keyringFile)) == NULL)
if (!keyringpath) {
if (!FORM_SERVAL_INSTANCE_PATH(keyringFile, "serval.keyring"))
RETURN(NULL);
keyringpath = keyringFile;
}
// Work out if the keyring file is writeable.
int writeable = 0;
const char *readonly_env = getenv("SERVAL_KEYRING_READONLY");
bool_t readonly_b;
if (readonly_env == NULL || cf_opt_boolean(&readonly_b, readonly_env) != CFOK || !readonly_b)
writeable = 1;
if ((k = keyring_open(keyringpath, writeable)) == NULL)
RETURN(NULL);
RETURN(k);
OUT();

2
serval.h
View File

@ -267,7 +267,7 @@ int keyring_identity_mac(keyring_context *c,keyring_identity *id,
extern keyring_file *keyring;
/* Public calls to keyring management */
keyring_file *keyring_open(const char *path);
keyring_file *keyring_open(const char *path, int writeable);
keyring_file *keyring_open_instance();
keyring_file *keyring_open_instance_cli(const struct cli_parsed *parsed);
int keyring_enter_pin(keyring_file *k, const char *pin);