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/* x509-parser.c -- print human readable info from an X.509 certificate
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "svn_pools.h"
#include "svn_cmdline.h"
#include "svn_string.h"
#include "svn_dirent_uri.h"
#include "svn_io.h"
#include "svn_base64.h"
#include "svn_x509.h"
#include "svn_time.h"
#include "svn_private_config.h"
#define PEM_BEGIN_CERT "-----BEGIN CERTIFICATE-----"
#define PEM_END_CERT "-----END CERTIFICATE-----"
static svn_error_t *
show_cert(const svn_string_t *der_cert, apr_pool_t *scratch_pool)
{
svn_x509_certinfo_t *certinfo;
const apr_array_header_t *hostnames;
SVN_ERR(svn_x509_parse_cert(&certinfo, der_cert->data, der_cert->len,
scratch_pool, scratch_pool));
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Subject: %s\n"),
svn_x509_certinfo_get_subject(certinfo, scratch_pool)));
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Valid from: %s\n"),
svn_time_to_human_cstring(
svn_x509_certinfo_get_valid_from(certinfo),
scratch_pool)));
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Valid until: %s\n"),
svn_time_to_human_cstring(
svn_x509_certinfo_get_valid_to(certinfo),
scratch_pool)));
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Issuer: %s\n"),
svn_x509_certinfo_get_issuer(certinfo, scratch_pool)));
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Fingerprint: %s\n"),
svn_checksum_to_cstring_display(
svn_x509_certinfo_get_digest(certinfo),
scratch_pool)));
hostnames = svn_x509_certinfo_get_hostnames(certinfo);
if (hostnames && !apr_is_empty_array(hostnames))
{
int i;
svn_stringbuf_t *buf = svn_stringbuf_create_empty(scratch_pool);
for (i = 0; i < hostnames->nelts; ++i)
{
const char *hostname = APR_ARRAY_IDX(hostnames, i, const char*);
if (i > 0)
svn_stringbuf_appendbytes(buf, ", ", 2);
svn_stringbuf_appendbytes(buf, hostname, strlen(hostname));
}
SVN_ERR(svn_cmdline_printf(scratch_pool, _("Hostnames: %s\n"),
buf->data));
}
return SVN_NO_ERROR;
}
static svn_boolean_t
is_der_cert(const svn_string_t *raw)
{
/* really simplistic fingerprinting of a DER. By definition it must
* start with an ASN.1 tag of a constructed (0x20) sequence (0x10).
* It's somewhat unfortunate that 0x30 happens to also come out to the
* ASCII for '0' which may mean this will create false positives. */
return raw->data[0] == 0x30 ? TRUE : FALSE;
}
static svn_error_t *
get_der_cert_from_stream(const svn_string_t **der_cert, svn_stream_t *in,
apr_pool_t *pool)
{
svn_string_t *raw;
SVN_ERR(svn_string_from_stream2(&raw, in, SVN__STREAM_CHUNK_SIZE,
pool));
*der_cert = NULL;
/* look for a DER cert */
if (is_der_cert(raw))
{
*der_cert = raw;
return SVN_NO_ERROR;
}
else
{
const svn_string_t *base64_decoded;
const char *start, *end;
/* Try decoding as base64 without headers */
base64_decoded = svn_base64_decode_string(raw, pool);
if (base64_decoded && is_der_cert(base64_decoded))
{
*der_cert = base64_decoded;
return SVN_NO_ERROR;
}
/* Try decoding as a PEM with begining and ending headers. */
start = strstr(raw->data, PEM_BEGIN_CERT);
end = strstr(raw->data, PEM_END_CERT);
if (start && end && end > start)
{
svn_string_t *encoded;
start += sizeof(PEM_BEGIN_CERT) - 1;
end -= 1;
encoded = svn_string_ncreate(start, end - start, pool);
base64_decoded = svn_base64_decode_string(encoded, pool);
if (is_der_cert(base64_decoded))
{
*der_cert = base64_decoded;
return SVN_NO_ERROR;
}
}
}
return svn_error_create(SVN_ERR_X509_CERT_INVALID_PEM, NULL,
_("Couldn't find certificate in input data"));
}
int main (int argc, const char *argv[])
{
apr_pool_t *pool = NULL;
svn_error_t *err;
svn_stream_t *in;
apr_initialize();
atexit(apr_terminate);
pool = svn_pool_create(NULL);
if (argc == 2)
{
const char *target = svn_dirent_canonicalize(argv[1], pool);
err = svn_stream_open_readonly(&in, target, pool, pool);
}
else if (argc == 1)
{
err = svn_stream_for_stdin2(&in, TRUE, pool);
}
else
err = svn_error_create(SVN_ERR_CL_ARG_PARSING_ERROR, NULL, _("Too many arguments"));
if (!err)
{
const svn_string_t *der_cert;
err = get_der_cert_from_stream(&der_cert, in, pool);
if (!err)
err = show_cert(der_cert, pool);
}
if (err)
return svn_cmdline_handle_exit_error(err, pool, "x509-parser: ");
return 0;
}
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