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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "rspamadm.h"
#include "printf.h"
#include "str_util.h"
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/pem.h>
static gchar *privkey_file = NULL;
static gchar *selector = NULL;
static gchar *domain = NULL;
static guint bits = 1024;
static void rspamadm_dkim_keygen (gint argc, gchar **argv);
static const char *rspamadm_dkim_keygen_help (gboolean full_help);
struct rspamadm_command dkim_keygen_command = {
.name = "dkim_keygen",
.flags = 0,
.help = rspamadm_dkim_keygen_help,
.run = rspamadm_dkim_keygen,
.lua_subrs = NULL,
};
static GOptionEntry entries[] = {
{"domain", 'd', 0, G_OPTION_ARG_STRING, &domain,
"Use the specified domain", NULL},
{"selector", 's', 0, G_OPTION_ARG_STRING, &selector,
"Use the specified selector", NULL},
{"privkey", 'k', 0, G_OPTION_ARG_STRING, &privkey_file,
"Save private key in the specified file", NULL},
{"bits", 'b', 0, G_OPTION_ARG_INT, &bits,
"Set key length to N bits (1024 by default)", NULL},
{NULL, 0, 0, G_OPTION_ARG_NONE, NULL, NULL, NULL}
};
static const char *
rspamadm_dkim_keygen_help (gboolean full_help)
{
const char *help_str;
if (full_help) {
help_str = "Create key pairs for dkim signing\n\n"
"Usage: rspamadm dkim_keygen -s selector -d domain [-k privkey] [-b bits]\n"
"Where options are:\n\n"
"-d: use the specified domain\n"
"-s: use the specified selector\n"
"-k: save private key to file instead of printing it to stdout\n"
"-b: set number of bits instead of 1024\n"
"--help: shows available options and commands";
}
else {
help_str = "Create dkim key pairs";
}
return help_str;
}
static void
rspamadm_dkim_keygen (gint argc, gchar **argv)
{
GOptionContext *context;
GError *error = NULL;
BIGNUM *e;
RSA *r;
BIO *pubout, *privout;
EVP_PKEY *pk;
gint rc;
glong publen;
gsize b64_len;
gchar *pubdata, *b64_data;
context = g_option_context_new (
"dkim_keygen - create dkim keys");
g_option_context_set_summary (context,
"Summary:\n Rspamd administration utility version "
RVERSION
"\n Release id: "
RID);
g_option_context_add_main_entries (context, entries, NULL);
if (!g_option_context_parse (context, &argc, &argv, &error)) {
fprintf (stderr, "option parsing failed: %s\n", error->message);
g_error_free (error);
exit (1);
}
if (bits > 4096 || bits < 512) {
fprintf (stderr, "Bits number must be in the interval 512...4096\n");
exit (EXIT_FAILURE);
}
e = BN_new ();
r = RSA_new ();
pk = EVP_PKEY_new ();
g_assert (BN_set_word (e, RSA_F4) == 1);
g_assert (RSA_generate_key_ex (r, bits, e, NULL) == 1);
g_assert (EVP_PKEY_set1_RSA (pk, r) == 1);
if (privkey_file) {
privout = BIO_new_file (privkey_file, "w");
if (privout == NULL) {
rspamd_fprintf (stderr, "cannot open output file %s: %s\n",
privkey_file, strerror (errno));
exit (EXIT_FAILURE);
}
}
else {
privout = BIO_new_fp (stdout, 0);
}
rc = PEM_write_bio_PrivateKey (privout, pk, NULL, NULL, 0, NULL, NULL);
if (rc != 1) {
rspamd_fprintf (stderr, "cannot write key to the output file %s: %s\n",
privkey_file ? privkey_file : "stdout", strerror (errno));
exit (EXIT_FAILURE);
}
BIO_free (privout);
fflush (stdout);
pubout = BIO_new (BIO_s_mem());
rc = i2d_RSA_PUBKEY_bio (pubout, r);
publen = BIO_get_mem_data (pubout, &pubdata);
g_assert (publen > 0);
b64_data = rspamd_encode_base64 (pubdata, publen, -1, &b64_len);
if (b64_len < 255 - 2) {
rspamd_printf ("%s._domainkey IN TXT ( \"v=DKIM1; k=rsa; \"\n"
"\t\"p=%s\" ) ;\n",
selector ? selector : "selector",
b64_data);
}
else {
guint i;
gint step = 253, remain = b64_len;
rspamd_printf ("%s._domainkey IN TXT ( \"v=DKIM1; k=rsa; \"\n",
selector ? selector : "selector");
for (i = 0; i < b64_len; i += step, remain -= step) {
if (i == 0) {
rspamd_printf ("\t\"p=%*s\"\n", MIN(step, remain), &b64_data[i]);
}
else {
step = 255;
rspamd_printf ("\t\"%*s\"\n", MIN(step, remain), &b64_data[i]);
}
}
rspamd_printf (") ; \n");
}
g_free (b64_data);
BIO_free (pubout);
EVP_PKEY_free (pk);
RSA_free (r);
BN_free (e);
}
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