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#include <errno.h>
#include <gpgme.h>
#include <locale.h>
#include <stdio.h>
#include <string.h>
#include "libnpass/gpg.h"
#include "libnpass/util.h"
#include "util.h"
#define gpg_err_ret(err) \
do { \
int __gpg_err_ret = gpgme_err_code_to_errno(err); \
if (err != 0) \
__gpg_err_ret = EPERM; \
\
gpg_cleanup(); \
return_err(-__gpg_err_ret, "%s: %s", gpgme_strsource(err), \
gpgme_strerror(err)); \
} while (0)
static gpgme_ctx_t ctx = NULL;
static gpgme_key_t key[2] = {0};
static int gpg_init(void);
static void gpg_cleanup(void);
static int gpg_init(void)
{
gpgme_error_t err;
const char *local = setlocale(LC_ALL, "");
gpgme_check_version(NULL);
gpgme_set_locale(NULL, LC_CTYPE, local);
#ifdef LC_MESSAGES
gpgme_set_locale(NULL, LC_MESSAGES, local);
#endif
err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_new(&ctx);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
return 0;
}
static void gpg_cleanup(void)
{
if (ctx)
gpgme_release(ctx);
if (*key)
gpgme_key_release(*key);
}
int gpg_key_validate(const char *fpr)
{
gpgme_error_t err;
int r;
r = gpg_init();
if (r < 0)
return r;
err = gpgme_get_key(ctx, fpr, key, 1);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
return 0;
}
int gpg_decrypt(FILE *pass_out, const char *pass_path)
{
gpgme_data_t in, out;
gpgme_error_t err;
char buf[BUFSIZ];
int r;
r = gpg_init();
if (r < 0)
return r;
err = gpgme_data_new_from_file(&in, pass_path, 1);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_data_new(&out);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_op_decrypt(ctx, in, out);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
r = gpgme_data_seek(out, 0, SEEK_SET);
if (r < 0)
goto out_gpg_cleanup;
while ((r = gpgme_data_read(out, buf, sizeof(buf))))
fwrite(buf, r, 1, pass_out);
if (r < 0)
goto out_gpg_cleanup;
out_gpg_cleanup:
gpg_cleanup();
if (r < 0)
return_err(-errno, "%s", strerror(errno));
else
return 0;
}
int gpg_encrypt(FILE *stream, const char *fpr, const char *pass, size_t n)
{
int r;
char buf[BUFSIZ];
gpgme_data_t in, out;
gpgme_error_t err;
r = gpg_init();
if (r < 0)
return r;
err = gpgme_get_key(ctx, fpr, key, 1);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_data_new_from_mem(&in, pass, n, 0);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_data_new(&out);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
err = gpgme_op_encrypt(ctx, key, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
if (err != GPG_ERR_NO_ERROR)
gpg_err_ret(err);
r = gpgme_data_seek(out, 0, SEEK_SET);
if (r < 0)
goto out_gpg_cleanup;
while ((r = gpgme_data_read(out, buf, sizeof(buf))))
fwrite(buf, r, 1, stream);
if (r < 0)
goto out_gpg_cleanup;
out_gpg_cleanup:
gpg_cleanup();
if (r < 0)
return_err(-errno, "%s", strerror(errno));
else
return 0;
}
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