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/* $Id: fileproc.c,v 1.4 2016/09/01 00:35:21 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 <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "extern.h"
static int
serialise(const char *tmp, const char *real,
const char *v, size_t vsz,
const char *v2, size_t v2sz)
{
int fd;
/*
* Write into backup location, overwriting.
* Then atomically (?) do the rename.
*/
fd = open(tmp, O_WRONLY|O_CREAT|O_TRUNC, 0444);
if (-1 == fd) {
warn("%s", tmp);
return (0);
} else if ((ssize_t)vsz != write(fd, v, vsz)) {
warnx("%s", tmp);
close(fd);
return (0);
} else if (NULL != v2 && (ssize_t)v2sz != write(fd, v2, v2sz)) {
warnx("%s", tmp);
close(fd);
return (0);
} else if (-1 == close(fd)) {
warn("%s", tmp);
return (0);
} else if (-1 == rename(tmp, real)) {
warn("%s", real);
return (0);
}
return (1);
}
int
fileproc(int certsock, int backup, const char *certdir)
{
char *csr, *ch;
size_t chsz, csz;
int rc;
long lval;
enum fileop op;
time_t t;
char file[PATH_MAX];
csr = ch = NULL;
rc = 0;
/* File-system and sandbox jailing. */
if (chroot(certdir) == -1) {
warn("chroot");
goto out;
}
if (chdir("/") == -1) {
warn("chdir");
goto out;
}
/*
* rpath and cpath for rename, wpath and cpath for
* writing to the temporary.
*/
if (pledge("stdio cpath wpath rpath", NULL) == -1) {
warn("pledge");
goto out;
}
/* Read our operation. */
op = FILE__MAX;
if (0 == (lval = readop(certsock, COMM_CHAIN_OP)))
op = FILE_STOP;
else if (FILE_CREATE == lval || FILE_REMOVE == lval)
op = lval;
if (FILE_STOP == op) {
rc = 1;
goto out;
} else if (FILE__MAX == op) {
warnx("unknown operation from certproc");
goto out;
}
/*
* If we're backing up, then copy all files (found) by linking
* them to the file followed by the epoch in seconds.
* If we're going to remove, the unlink(2) will cause the
* original to go away.
* If we're going to update, the rename(2) will replace the
* certificate, leaving the backup as the only one.
*/
if (backup) {
t = time(NULL);
snprintf(file, sizeof(file),
"cert-%llu.pem", (unsigned long long)t);
if (-1 == link(CERT_PEM, file) && ENOENT != errno) {
warnx("%s/%s", certdir, CERT_PEM);
goto out;
} else
dodbg("%s/%s: linked to %s",
certdir, CERT_PEM, file);
snprintf(file, sizeof(file),
"chain-%llu.pem", (unsigned long long)t);
if (-1 == link(CHAIN_PEM, file) && ENOENT != errno) {
warnx("%s/%s", certdir, CHAIN_PEM);
goto out;
} else
dodbg("%s/%s: linked to %s",
certdir, CHAIN_PEM, file);
snprintf(file, sizeof(file),
"fullchain-%llu.pem", (unsigned long long)t);
if (-1 == link(FCHAIN_PEM, file) && ENOENT != errno) {
warnx("%s/%s", certdir, FCHAIN_PEM);
goto out;
} else
dodbg("%s/%s: linked to %s",
certdir, FCHAIN_PEM, file);
}
/*
* If revoking certificates, just unlink the files.
* We return the special error code of 2 to indicate that the
* certificates were removed.
*/
if (FILE_REMOVE == op) {
if (-1 == unlink(CERT_PEM) && ENOENT != errno) {
warn("%s/%s", certdir, CERT_PEM);
goto out;
} else
dodbg("%s/%s: unlinked", certdir, CERT_PEM);
if (-1 == unlink(CHAIN_PEM) && ENOENT != errno) {
warn("%s/%s", certdir, CHAIN_PEM);
goto out;
} else
dodbg("%s/%s: unlinked", certdir, CHAIN_PEM);
if (-1 == unlink(FCHAIN_PEM) && ENOENT != errno) {
warn("%s/%s", certdir, FCHAIN_PEM);
goto out;
} else
dodbg("%s/%s: unlinked", certdir, FCHAIN_PEM);
rc = 2;
goto out;
}
/*
* Start by downloading the chain PEM as a buffer.
* This is not nil-terminated, but we're just going to guess
* that it's well-formed and not actually touch the data.
* Once downloaded, dump it into CHAIN_BAK.
*/
if (NULL == (ch = readbuf(certsock, COMM_CHAIN, &chsz)))
goto out;
if ( ! serialise(CHAIN_BAK, CHAIN_PEM, ch, chsz, NULL, 0))
goto out;
dodbg("%s/%s: created", certdir, CHAIN_PEM);
/*
* Next, wait until we receive the DER encoded (signed)
* certificate from the network process.
* This comes as a stream of bytes: we don't know how many, so
* just keep downloading.
*/
if (NULL == (csr = readbuf(certsock, COMM_CSR, &csz)))
goto out;
if ( ! serialise(CERT_BAK, CERT_PEM, csr, csz, NULL, 0))
goto out;
dodbg("%s/%s: created", certdir, CERT_PEM);
/*
* Finally, create the full-chain file.
* This is just the concatenation of the certificate and chain.
* We return the special error code 2 to indicate that the
* on-file certificates were changed.
*/
if ( ! serialise(FCHAIN_BAK, FCHAIN_PEM, csr, csz, ch, chsz))
goto out;
dodbg("%s/%s: created", certdir, FCHAIN_PEM);
rc = 2;
out:
close(certsock);
free(csr);
free(ch);
return (rc);
}
|
