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/* $Id: certproc.c,v 1.13 2020/09/14 15:58:50 florian Exp $ */
/*
* Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include "extern.h"
#define BEGIN_MARKER "-----BEGIN CERTIFICATE-----"
#define END_MARKER "-----END CERTIFICATE-----"
int
certproc(int netsock, int filesock)
{
char *csr = NULL, *chain = NULL, *url = NULL;
char *chaincp;
size_t csrsz, chainsz;
int rc = 0, cc;
enum certop op;
long lval;
if (pledge("stdio", NULL) == -1) {
warn("pledge");
goto out;
}
/* Read what the netproc wants us to do. */
op = CERT__MAX;
if ((lval = readop(netsock, COMM_CSR_OP)) == 0)
op = CERT_STOP;
else if (lval == CERT_REVOKE || lval == CERT_UPDATE)
op = lval;
if (CERT_STOP == op) {
rc = 1;
goto out;
} else if (CERT__MAX == op) {
warnx("unknown operation from netproc");
goto out;
}
/*
* Pass revocation right through to fileproc.
* If the reader is terminated, ignore it.
*/
if (CERT_REVOKE == op) {
if (writeop(filesock, COMM_CHAIN_OP, FILE_REMOVE) >= 0)
rc = 1;
goto out;
}
/*
* Wait until we receive the DER encoded (signed) certificate
* from the network process.
* Then convert the DER encoding into an X509 certificate.
*/
if ((csr = readbuf(netsock, COMM_CSR, &csrsz)) == NULL)
goto out;
if (csrsz < strlen(END_MARKER)) {
warnx("invalid cert");
goto out;
}
chaincp = strstr(csr, END_MARKER);
if (chaincp == NULL) {
warnx("invalid cert");
goto out;
}
chaincp += strlen(END_MARKER);
if ((chaincp = strstr(chaincp, BEGIN_MARKER)) == NULL) {
warnx("invalid certificate chain");
goto out;
}
if ((chain = strdup(chaincp)) == NULL) {
warn("strdup");
goto out;
}
*chaincp = '\0';
chainsz = strlen(chain);
csrsz = strlen(csr);
/* Allow reader termination to just push us out. */
if ((cc = writeop(filesock, COMM_CHAIN_OP, FILE_CREATE)) == 0)
rc = 1;
if (cc <= 0)
goto out;
if ((cc = writebuf(filesock, COMM_CHAIN, chain, chainsz)) == 0)
rc = 1;
if (cc <= 0)
goto out;
if (writebuf(filesock, COMM_CSR, csr, csrsz) < 0)
goto out;
rc = 1;
out:
close(netsock);
close(filesock);
free(csr);
free(url);
free(chain);
return rc;
}
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