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/* wydawca - FTP release synchronisation daemon
Copyright (C) 2007 Sergey Poznyakoff
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "wydawca.h"
#include "save-cwd.h"
#include <gpgme.h>
#define fail_if_err(expr) \
do \
{ \
int a = expr; \
if (a) \
{ \
logmsg (LOG_ERR, "%s: GPGME error: %s", #expr, gpgme_strerror (a)); \
return 1; \
} \
} \
while (0)
static char *homedir;
static int rmdir_r (const char *name);
static int
recursive_rmdir (const char *name)
{
int rc;
DIR *dir;
struct dirent *ent;
if (chdir (name))
{
logmsg (LOG_ERR, "cannot change to directory %s: %s",
name, strerror (errno));
return 1;
}
dir = opendir (".");
if (!dir)
{
logmsg (LOG_ERR, "cannot open directory %s: %s",
name, strerror (errno));
return 1;
}
for (rc = 0; rc == 0 && (ent = readdir (dir));)
{
struct stat st;
if (strcmp (ent->d_name, ".") == 0
|| strcmp (ent->d_name, "..") == 0)
continue;
if (stat (ent->d_name, &st) && errno != ENOENT)
{
logmsg (LOG_ERR, "cannot stat file `%s': %s",
name, strerror (errno));
rc = 1;
}
else if (S_ISDIR (st.st_mode))
rc = rmdir_r (ent->d_name);
else if ((rc = unlink (ent->d_name)) != 0 && errno != ENOENT)
logmsg (LOG_ERR, "cannot unlink %s: %s",
ent->d_name, strerror (errno));
}
closedir (dir);
return rc;
}
static int
rmdir_r (const char *name)
{
int rc;
struct saved_cwd cwd;
if (save_cwd (&cwd))
{
logmsg (LOG_ERR, "cannot save current directory: %s",
strerror (errno));
return 1;
}
rc = recursive_rmdir (name);
if (restore_cwd (&cwd))
{
logmsg (LOG_ERR, "cannot restore current directory: %s",
strerror (errno));
rc = 1;
}
if (rc == 0 && rmdir (name))
{
logmsg (LOG_ERR, "cannot remove directory %s: %s",
name, strerror (errno));
return 1;
}
return rc;
}
static void
remove_homedir ()
{
if (debug_level > 1)
logmsg (LOG_DEBUG, "Removing GNUPG home directory: %s", homedir);
if (rmdir_r (homedir))
logmsg (LOG_CRIT, "Failed to remove GPG directory %s", homedir);
}
int
wydawca_gpg_homedir ()
{
if (homedir)
return;
homedir = xstrdup ("/tmp/wydawca-XXXXXX");
if (!mkdtemp (homedir))
{
logmsg (LOG_CRIT, "cannot create GPG home directory (%s): %s",
homedir, strerror (errno));
return 1;
}
atexit (remove_homedir);
if (debug_level > 1)
logmsg (LOG_DEBUG, "GNUPG home directory: %s", homedir);
setenv ("GNUPGHOME", homedir, 1);
}
int
verify_signature (struct file_register *reg, struct directory_pair *dpair,
const char *pubkey)
{
gpgme_ctx_t ctx;
gpgme_data_t key_data, directive_data, plain;
off_t size;
size_t dcount, i;
char *p;
wydawca_gpg_homedir ();
fail_if_err (gpgme_new (&ctx));
fail_if_err (gpgme_data_new_from_mem (&key_data, pubkey, strlen (pubkey), 0));
fail_if_err (gpgme_op_import (ctx, key_data));
fail_if_err (gpgme_data_new_from_file (&directive_data,
reg->file[file_directive].name, 1));
gpgme_data_new (&plain);
fail_if_err (gpgme_op_verify (ctx, directive_data, NULL, plain));
gpgme_data_release (directive_data);
gpgme_data_release (key_data);
size = gpgme_data_seek (plain, 0, SEEK_END);
gpgme_data_seek (plain, 0, SEEK_SET);
reg->blurb = xmalloc (size + 1);
gpgme_data_read (plain, reg->blurb, size);
reg->blurb[size] = 0;
dcount = 1;
for (p = reg->blurb; *p; p++)
if (*p == '\n')
dcount++;
reg->directive = xcalloc (dcount, sizeof reg->directive[0]);
p = reg->blurb;
for (i = 0; i < dcount; i++)
{
reg->directive[i] = p;
p = strchr (p, '\n');
if (!p)
break;
*p++ = 0;
}
reg->directive[i] = NULL;
return 0;
}
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