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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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#ifdef __FreeBSD__
#include <sys/capsicum.h>
#endif
#include <kcgi.h>
#include <kcgihtml.h>
static int dir = -1;
static const char *Page = "up";
static const struct kvalid Key = { NULL, "file" };
static enum kcgi_err head(struct kreq *req, enum khttp http, enum kmime mime) {
return khttp_head(req, kresps[KRESP_STATUS], "%s", khttps[http])
|| khttp_head(req, kresps[KRESP_CONTENT_TYPE], "%s", kmimetypes[mime]);
}
static enum kcgi_err fail(struct kreq *req, enum khttp http) {
return head(req, http, KMIME_TEXT_PLAIN)
|| khttp_body(req)
|| khttp_printf(req, "%s\n", khttps[http]);
}
static const char *upload(const char *ext, void *ptr, size_t len) {
static char name[256];
snprintf(
name, sizeof(name), "%jx%08x%s%s",
(intmax_t)time(NULL), arc4random(),
(ext && ext[0] != '.' ? "." : ""), (ext ? ext : "")
);
int fd = openat(dir, name, O_CREAT | O_EXCL | O_WRONLY, 0644);
if (fd < 0) {
warn("%s", name);
return NULL;
}
ssize_t n = write(fd, ptr, len);
int error = close(fd);
if (n < 0 || error) {
warn("%s", name);
return NULL;
}
return name;
}
static enum kcgi_err handle(struct kreq *req) {
if (req->page) return fail(req, KHTTP_404);
if (req->method == KMETHOD_GET) {
struct khtmlreq html;
struct khtmlreq *h = &html;
return head(req, KHTTP_200, KMIME_TEXT_HTML)
|| khttp_body(req)
|| khtml_open(h, req, 0)
|| khtml_elem(h, KELEM_DOCTYPE)
|| khtml_elem(h, KELEM_TITLE)
|| khtml_puts(h, "Upload")
|| khtml_closeelem(h, 1)
|| khtml_attr(
h, KELEM_FORM,
KATTR_METHOD, "post",
KATTR_ACTION, "",
KATTR_ENCTYPE, "multipart/form-data",
KATTR__MAX
)
|| khtml_attr(
h, KELEM_INPUT,
KATTR_TYPE, "file",
KATTR_NAME, Key.name,
KATTR__MAX
)
|| khtml_attr(
h, KELEM_INPUT,
KATTR_TYPE, "submit",
KATTR_VALUE, "Upload",
KATTR__MAX
)
|| khtml_close(h);
} else if (req->method == KMETHOD_POST) {
struct kpair *field = req->fieldmap[0];
if (!field || !field->valsz) return fail(req, KHTTP_400);
const char *ext = strrchr(field->file, '.');
const char *name = upload(ext, field->val, field->valsz);
if (!name) return fail(req, KHTTP_507);
return head(req, KHTTP_303, KMIME_TEXT_PLAIN)
|| khttp_head(req, kresps[KRESP_LOCATION], "/%s", name)
|| khttp_body(req)
|| khttp_puts(req, name);
} else if (req->method == KMETHOD_PUT) {
struct kpair *field = req->fields;
if (!field || !field->valsz) return fail(req, KHTTP_400);
const char *ext = req->suffix;
if (!ext[0]) ext = strrchr(field->file, '.');
const char *name = upload(ext, field->val, field->valsz);
if (!name) return fail(req, KHTTP_507);
return head(req, KHTTP_200, KMIME_TEXT_PLAIN)
|| khttp_body(req)
|| khttp_printf(
req, "%s://%s/%s\n", kschemes[req->scheme], req->host, name
);
} else {
return fail(req, KHTTP_405);
}
}
static void cgi(void) {
#ifdef __OpenBSD__
if (pledge("stdio wpath cpath proc", NULL)) err(EX_OSERR, "pledge");
#endif
struct kreq req;
enum kcgi_err error = khttp_parse(&req, &Key, 1, &Page, 1, 0);
if (error) errx(EX_PROTOCOL, "khttp_parse: %s", kcgi_strerror(error));
#ifdef __OpenBSD__
if (pledge("stdio wpath cpath", NULL)) err(EX_OSERR, "pledge");
#endif
#ifdef __FreeBSD__
if (cap_enter()) err(EX_OSERR, "cap_enter");
#endif
error = handle(&req);
if (error) errx(EX_PROTOCOL, "%s", kcgi_strerror(error));
khttp_free(&req);
}
static void fcgi(void) {
#ifdef __OpenBSD__
if (pledge("stdio wpath cpath unix sendfd recvfd proc", NULL)) {
err(EX_OSERR, "pledge");
}
#endif
struct kfcgi *fcgi;
enum kcgi_err error = khttp_fcgi_init(&fcgi, &Key, 1, &Page, 1, 0);
if (error) errx(EX_CONFIG, "khttp_fcgi_init: %s", kcgi_strerror(error));
#ifdef __OpenBSD__
if (pledge("stdio wpath cpath recvfd", NULL)) err(EX_OSERR, "pledge");
#endif
#ifdef __FreeBSD__
if (cap_enter()) err(EX_OSERR, "cap_enter");
#endif
for (
struct kreq req;
KCGI_OK == (error = khttp_fcgi_parse(fcgi, &req));
khttp_free(&req)
) {
error = handle(&req);
if (error && error != KCGI_HUP) break;
}
if (error != KCGI_EXIT) {
errx(EX_PROTOCOL, "khttp_fcgi_parse: %s", kcgi_strerror(error));
}
khttp_fcgi_free(fcgi);
}
int main(int argc, char *argv[]) {
int error;
const char *path = (argc > 1 ? argv[1] : ".");
dir = open(path, O_DIRECTORY);
if (dir < 0) err(EX_NOINPUT, "%s", path);
#ifdef __OpenBSD__
error = unveil(path, "wc");
if (error) err(EX_OSERR, "unveil");
#endif
#ifdef __FreeBSD__
cap_rights_t rights;
cap_rights_init(&rights, CAP_LOOKUP, CAP_CREATE, CAP_PWRITE);
error = cap_rights_limit(dir, &rights);
if (error) err(EX_OSERR, "cap_rights_limit");
#endif
if (khttp_fcgi_test()) {
fcgi();
} else {
cgi();
}
}
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