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/* CRL importer
*
* Copyright (C) 2015 Matt Rogers <mrogers@libreswan.org>
*
* 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 2 of the License, or (at your
* option) any later version. See <https://www.gnu.org/licenses/gpl2.txt>.
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h> /* for WIFEXITED() et.al. */
#include <cert.h>
#include "nss_crl_import.h"
#include <certdb.h>
#include "defs.h"
#include "log.h"
#include "lswalloc.h"
#include "lswnss.h" /* for llog_nss_error() */
static const char crl_name[] = "_import_crl";
/*
* Calls the _import_crl process to add a CRL to the NSS db.
*/
int send_crl_to_import(uint8_t *der, size_t len, const char *url, struct logger *logger)
{
CERTCertificate *cacert = NULL; /* must have function scope */
PLArenaPool *arena = NULL;
SECItem crl_si;
char *arg[4] = { NULL };
char lenarg[32];
char crl_path_space[4096]; /* plenty long? */
ssize_t n = 0;
int wstatus;
int ret = -1;
int pfd[2];
if (der == NULL || len < 1) {
DBG_log("CRL buffer error");
return -1;
}
snprintf(lenarg, sizeof(lenarg), "%zu", len);
arg[1] = (char *)url;
arg[2] = lenarg;
/* find a pathname to the CRL import helper */
#if !(defined(macintosh) || (defined(__MACH__) && defined(__APPLE__)))
/*
* The program will be in the same directory as Pluto,
* so we use the sympolic link /proc/self/exe to
* tell us of the path prefix.
*/
n = readlink("/proc/self/exe", crl_path_space,
sizeof(crl_path_space));
if (n < 0) {
# ifdef __uClibc__
/* on some nommu we have no proc/self/exe, try without path */
*crl_path_space = '\0';
n = 0;
# else
fatal_errno(PLUTO_EXIT_FAIL, logger, errno,
"readlink(\"/proc/self/exe\") failed for crl helper");
# endif
}
#else
arg[0] = clone_str("/usr/local/libexec/ipsec/_import_crl", "crl helper");
#endif
if ((size_t)n > sizeof(crl_path_space) - sizeof(crl_name)) {
fatal(PLUTO_EXIT_FAIL, logger, "path to %s is too long", crl_name);
}
while (n > 0 && crl_path_space[n - 1] != '/')
n--;
strcpy(crl_path_space + n, crl_name);
arg[0] = clone_str(crl_path_space, "crl path");
dbg("Calling %s to import CRL - url: %s, der size: %s",
arg[0],
arg[1],
arg[2]);
crl_si.len = len;
crl_si.data = der;
crl_si.type = siBuffer;
/*
* CERT_GetDefaultCertDB() simply returns the contents of a
* static variable set by NSS_Initialize(). It doesn't check
* the value and doesn't set PR error. Short of calling
* CERT_SetDefaultCertDB(NULL), the value can never be NULL.
*/
CERTCertDBHandle *handle = CERT_GetDefaultCertDB();
passert(handle != NULL);
/* do some pre-decoding, and check for the issuer.
* The issuer name is needed to flush the cache */
arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
/* arena owned by crl */
CERTSignedCrl *crl = CERT_DecodeDERCrl(arena, &crl_si, SEC_CRL_TYPE);
if (crl == NULL) {
ldbg_nss_error(logger, "decoding CRL using CERT_DecodeDERCrl() failed");
PORT_FreeArena(arena, false);
goto end;
}
cacert = CERT_FindCertByName(handle, &crl->crl.derName);
if (cacert == NULL) {
ldbg_nss_error(logger, "finding cert by name using CERT_FindCertByName() failed");
SEC_DestroyCrl(crl);
goto end;
}
if (pipe(pfd) == -1) {
dbg("pipe() error: %s", strerror(errno));
goto end;
}
pid_t child = fork();
switch (child) {
case -1:
dbg("fork() error: %s", strerror(errno));
break;
case 0: /*child*/
if (close(pfd[1]) == -1) {
dbg("close(pfd[1]) error: %s",
strerror(errno));
break;
}
if (pfd[0] != STDIN_FILENO) {
if (dup2(pfd[0], STDIN_FILENO) == -1) {
dbg("dup2() error: %s",
strerror(errno));
break;
}
if (close(pfd[0]) == -1) {
dbg("close() error: %s",
strerror(errno));
break;
}
}
execve(arg[0], arg, NULL);
dbg("execve() error: %s", strerror(errno));
break;
default: /*parent*/
if (close(pfd[0]) == -1) {
dbg("close(pfd[0]) error: %s",
strerror(errno));
break;
}
if (write(pfd[1], der, len) != (ssize_t)len) {
dbg("partial/failed write");
break;
}
if (close(pfd[1]) == -1) {
dbg("close(pfd[1]) error: %s",
strerror(errno));
break;
}
waitpid(child, &wstatus, 0);
if (WIFEXITED(wstatus)) {
dbg("CRL helper exited with status: %d",
WEXITSTATUS(wstatus));
ret = WEXITSTATUS(wstatus);
}
pfree(arg[0]);
break;
}
/* update CRL cache */
if (ret == 0) {
CERT_CRLCacheRefreshIssuer(handle, &cacert->derSubject);
}
end:
if (cacert != NULL)
CERT_DestroyCertificate(cacert);
return ret;
}
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