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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* 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 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "bounce.h"
// This basically exists to work around certbot's symlinks from "live" into
// "archive" under capsicum.
int certOpen(struct Cert *cert, const char *path) {
char buf[PATH_MAX];
snprintf(buf, sizeof(buf), "%s", path);
char *base = strrchr(buf, '/');
if (base) {
*base = '\0';
snprintf(cert->name, sizeof(cert->name), "%s", &base[1]);
cert->parent = open(buf, O_DIRECTORY);
} else {
snprintf(cert->name, sizeof(cert->name), "%s", path);
cert->parent = open(".", O_DIRECTORY);
}
if (cert->parent < 0) return -1;
cert->target = cert->parent;
ssize_t len = readlinkat(cert->parent, cert->name, buf, sizeof(buf) - 1);
if (len < 0 && errno == EINVAL) return 0;
if (len < 0) return -1;
buf[len] = '\0';
base = strrchr(buf, '/');
if (base) {
*base = '\0';
cert->target = openat(cert->parent, buf, O_DIRECTORY);
if (cert->target < 0) return -1;
}
return 0;
}
FILE *certFile(const struct Cert *cert) {
const char *name = cert->name;
char buf[PATH_MAX];
ssize_t len = readlinkat(cert->parent, cert->name, buf, sizeof(buf) - 1);
if (len < 0) {
if (errno != EINVAL) return NULL;
} else {
// XXX: Assume only the target base name has changed.
buf[len] = '\0';
name = strrchr(buf, '/');
if (name) {
name = &name[1];
} else {
name = buf;
}
}
int fd = openat(cert->target, name, O_RDONLY);
if (fd < 0) return NULL;
return fdopen(fd, "r");
}
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