You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
651 lines
11 KiB
651 lines
11 KiB
/*
|
|
* cgi-io - LuCI non-RPC helper
|
|
*
|
|
* Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
|
|
*
|
|
* Permission to use, copy, modify, and/or 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 AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdbool.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <ctype.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include <libubus.h>
|
|
#include <libubox/blobmsg.h>
|
|
|
|
#include "multipart_parser.h"
|
|
|
|
|
|
enum part {
|
|
PART_UNKNOWN,
|
|
PART_SESSIONID,
|
|
PART_FILENAME,
|
|
PART_FILEMODE,
|
|
PART_FILEDATA
|
|
};
|
|
|
|
const char *parts[] = {
|
|
"(bug)",
|
|
"sessionid",
|
|
"filename",
|
|
"filemode",
|
|
"filedata",
|
|
};
|
|
|
|
struct state
|
|
{
|
|
bool is_content_disposition;
|
|
enum part parttype;
|
|
char *sessionid;
|
|
char *filename;
|
|
bool filedata;
|
|
int filemode;
|
|
int filefd;
|
|
int tempfd;
|
|
};
|
|
|
|
enum {
|
|
SES_ACCESS,
|
|
__SES_MAX,
|
|
};
|
|
|
|
static const struct blobmsg_policy ses_policy[__SES_MAX] = {
|
|
[SES_ACCESS] = { .name = "access", .type = BLOBMSG_TYPE_BOOL },
|
|
};
|
|
|
|
|
|
static struct state st;
|
|
|
|
static void
|
|
session_access_cb(struct ubus_request *req, int type, struct blob_attr *msg)
|
|
{
|
|
struct blob_attr *tb[__SES_MAX];
|
|
bool *allow = (bool *)req->priv;
|
|
|
|
if (!msg)
|
|
return;
|
|
|
|
blobmsg_parse(ses_policy, __SES_MAX, tb, blob_data(msg), blob_len(msg));
|
|
|
|
if (tb[SES_ACCESS])
|
|
*allow = blobmsg_get_bool(tb[SES_ACCESS]);
|
|
}
|
|
|
|
static bool
|
|
session_access(const char *sid, const char *obj, const char *func)
|
|
{
|
|
uint32_t id;
|
|
bool allow = false;
|
|
struct ubus_context *ctx;
|
|
static struct blob_buf req;
|
|
|
|
ctx = ubus_connect(NULL);
|
|
|
|
if (!ctx || ubus_lookup_id(ctx, "session", &id))
|
|
goto out;
|
|
|
|
blob_buf_init(&req, 0);
|
|
blobmsg_add_string(&req, "ubus_rpc_session", sid);
|
|
blobmsg_add_string(&req, "scope", "cgi-io");
|
|
blobmsg_add_string(&req, "object", obj);
|
|
blobmsg_add_string(&req, "function", func);
|
|
|
|
ubus_invoke(ctx, id, "access", req.head, session_access_cb, &allow, 500);
|
|
|
|
out:
|
|
if (ctx)
|
|
ubus_free(ctx);
|
|
|
|
return allow;
|
|
}
|
|
|
|
static char *
|
|
md5sum(const char *file)
|
|
{
|
|
pid_t pid;
|
|
int fds[2];
|
|
static char md5[33];
|
|
|
|
if (pipe(fds))
|
|
return NULL;
|
|
|
|
switch ((pid = fork()))
|
|
{
|
|
case -1:
|
|
return NULL;
|
|
|
|
case 0:
|
|
uloop_done();
|
|
|
|
dup2(fds[1], 1);
|
|
|
|
close(0);
|
|
close(2);
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
if (execl("/bin/busybox", "/bin/busybox", "md5sum", file, NULL))
|
|
return NULL;
|
|
|
|
break;
|
|
|
|
default:
|
|
memset(md5, 0, sizeof(md5));
|
|
read(fds[0], md5, 32);
|
|
waitpid(pid, NULL, 0);
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
}
|
|
|
|
return md5;
|
|
}
|
|
|
|
static char *
|
|
datadup(const void *in, size_t len)
|
|
{
|
|
char *out = malloc(len + 1);
|
|
|
|
if (!out)
|
|
return NULL;
|
|
|
|
memcpy(out, in, len);
|
|
|
|
*(out + len) = 0;
|
|
|
|
return out;
|
|
}
|
|
|
|
static bool
|
|
urldecode(char *buf)
|
|
{
|
|
char *c, *p;
|
|
|
|
if (!buf || !*buf)
|
|
return true;
|
|
|
|
#define hex(x) \
|
|
(((x) <= '9') ? ((x) - '0') : \
|
|
(((x) <= 'F') ? ((x) - 'A' + 10) : \
|
|
((x) - 'a' + 10)))
|
|
|
|
for (c = p = buf; *p; c++)
|
|
{
|
|
if (*p == '%')
|
|
{
|
|
if (!isxdigit(*(p + 1)) || !isxdigit(*(p + 2)))
|
|
return false;
|
|
|
|
*c = (char)(16 * hex(*(p + 1)) + hex(*(p + 2)));
|
|
|
|
p += 3;
|
|
}
|
|
else if (*p == '+')
|
|
{
|
|
*c = ' ';
|
|
p++;
|
|
}
|
|
else
|
|
{
|
|
*c = *p++;
|
|
}
|
|
}
|
|
|
|
*c = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
postdecode(char **fields, int n_fields)
|
|
{
|
|
char *p;
|
|
const char *var;
|
|
static char buf[1024];
|
|
int i, len, field, found = 0;
|
|
|
|
var = getenv("CONTENT_TYPE");
|
|
|
|
if (!var || strncmp(var, "application/x-www-form-urlencoded", 33))
|
|
return false;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
if ((len = read(0, buf, sizeof(buf) - 1)) > 0)
|
|
{
|
|
for (p = buf, i = 0; i <= len; i++)
|
|
{
|
|
if (buf[i] == '=')
|
|
{
|
|
buf[i] = 0;
|
|
|
|
for (field = 0; field < (n_fields * 2); field += 2)
|
|
{
|
|
if (!strcmp(p, fields[field]))
|
|
{
|
|
fields[field + 1] = buf + i + 1;
|
|
found++;
|
|
}
|
|
}
|
|
}
|
|
else if (buf[i] == '&' || buf[i] == '\0')
|
|
{
|
|
buf[i] = 0;
|
|
|
|
if (found >= n_fields)
|
|
break;
|
|
|
|
p = buf + i + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (field = 0; field < (n_fields * 2); field += 2)
|
|
if (!urldecode(fields[field + 1]))
|
|
return false;
|
|
|
|
return (found >= n_fields);
|
|
}
|
|
|
|
static int
|
|
response(bool success, const char *message)
|
|
{
|
|
char *md5;
|
|
struct stat s;
|
|
|
|
printf("Status: 200 OK\r\n");
|
|
printf("Content-Type: text/plain\r\n\r\n{\n");
|
|
|
|
if (success)
|
|
{
|
|
if (!stat(st.filename, &s) && (md5 = md5sum(st.filename)) != NULL)
|
|
printf("\t\"size\": %u,\n\t\"checksum\": \"%s\"\n",
|
|
(unsigned int)s.st_size, md5);
|
|
}
|
|
else
|
|
{
|
|
if (message)
|
|
printf("\t\"message\": \"%s\",\n", message);
|
|
|
|
printf("\t\"failure\": [ %u, \"%s\" ]\n", errno, strerror(errno));
|
|
|
|
if (st.filefd > -1)
|
|
unlink(st.filename);
|
|
}
|
|
|
|
printf("}\n");
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
failure(int e, const char *message)
|
|
{
|
|
printf("Status: 500 Internal Server failure\r\n");
|
|
printf("Content-Type: text/plain\r\n\r\n");
|
|
printf("%s", message);
|
|
|
|
if (e)
|
|
printf(": %s", strerror(e));
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
filecopy(void)
|
|
{
|
|
int len;
|
|
char buf[4096];
|
|
|
|
if (!st.filedata)
|
|
{
|
|
close(st.tempfd);
|
|
errno = EINVAL;
|
|
return response(false, "No file data received");
|
|
}
|
|
|
|
if (lseek(st.tempfd, 0, SEEK_SET) < 0)
|
|
{
|
|
close(st.tempfd);
|
|
return response(false, "Failed to rewind temp file");
|
|
}
|
|
|
|
st.filefd = open(st.filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
|
|
|
|
if (st.filefd < 0)
|
|
{
|
|
close(st.tempfd);
|
|
return response(false, "Failed to open target file");
|
|
}
|
|
|
|
while ((len = read(st.tempfd, buf, sizeof(buf))) > 0)
|
|
{
|
|
if (write(st.filefd, buf, len) != len)
|
|
{
|
|
close(st.tempfd);
|
|
close(st.filefd);
|
|
return response(false, "I/O failure while writing target file");
|
|
}
|
|
}
|
|
|
|
close(st.tempfd);
|
|
close(st.filefd);
|
|
|
|
if (chmod(st.filename, st.filemode))
|
|
return response(false, "Failed to chmod target file");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
header_field(multipart_parser *p, const char *data, size_t len)
|
|
{
|
|
st.is_content_disposition = !strncasecmp(data, "Content-Disposition", len);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
header_value(multipart_parser *p, const char *data, size_t len)
|
|
{
|
|
int i, j;
|
|
|
|
if (!st.is_content_disposition)
|
|
return 0;
|
|
|
|
if (len < 10 || strncasecmp(data, "form-data", 9))
|
|
return 0;
|
|
|
|
for (data += 9, len -= 9; *data == ' ' || *data == ';'; data++, len--);
|
|
|
|
if (len < 8 || strncasecmp(data, "name=\"", 6))
|
|
return 0;
|
|
|
|
for (data += 6, len -= 6, i = 0; i <= len; i++)
|
|
{
|
|
if (*(data + i) != '"')
|
|
continue;
|
|
|
|
for (j = 1; j < sizeof(parts) / sizeof(parts[0]); j++)
|
|
if (!strncmp(data, parts[j], i))
|
|
st.parttype = j;
|
|
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
data_begin_cb(multipart_parser *p)
|
|
{
|
|
char tmpname[24] = "/tmp/luci-upload.XXXXXX";
|
|
|
|
if (st.parttype == PART_FILEDATA)
|
|
{
|
|
if (!st.sessionid)
|
|
return response(false, "File data without session");
|
|
|
|
if (!st.filename)
|
|
return response(false, "File data without name");
|
|
|
|
st.tempfd = mkstemp(tmpname);
|
|
|
|
if (st.tempfd < 0)
|
|
return response(false, "Failed to create temporary file");
|
|
|
|
unlink(tmpname);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
data_cb(multipart_parser *p, const char *data, size_t len)
|
|
{
|
|
switch (st.parttype)
|
|
{
|
|
case PART_SESSIONID:
|
|
st.sessionid = datadup(data, len);
|
|
break;
|
|
|
|
case PART_FILENAME:
|
|
st.filename = datadup(data, len);
|
|
break;
|
|
|
|
case PART_FILEMODE:
|
|
st.filemode = strtoul(data, NULL, 8);
|
|
break;
|
|
|
|
case PART_FILEDATA:
|
|
if (write(st.tempfd, data, len) != len)
|
|
{
|
|
close(st.tempfd);
|
|
return response(false, "I/O failure while writing temporary file");
|
|
}
|
|
|
|
if (!st.filedata)
|
|
st.filedata = !!len;
|
|
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
data_end_cb(multipart_parser *p)
|
|
{
|
|
if (st.parttype == PART_SESSIONID)
|
|
{
|
|
if (!session_access(st.sessionid, "upload", "write"))
|
|
{
|
|
errno = EPERM;
|
|
return response(false, "Upload permission denied");
|
|
}
|
|
}
|
|
else if (st.parttype == PART_FILEDATA)
|
|
{
|
|
if (st.tempfd < 0)
|
|
return response(false, "Internal program failure");
|
|
|
|
#if 0
|
|
/* prepare directory */
|
|
for (ptr = st.filename; *ptr; ptr++)
|
|
{
|
|
if (*ptr == '/')
|
|
{
|
|
*ptr = 0;
|
|
|
|
if (mkdir(st.filename, 0755))
|
|
{
|
|
unlink(st.tmpname);
|
|
return response(false, "Failed to create destination directory");
|
|
}
|
|
|
|
*ptr = '/';
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (filecopy())
|
|
return -1;
|
|
|
|
return response(true, NULL);
|
|
}
|
|
|
|
st.parttype = PART_UNKNOWN;
|
|
return 0;
|
|
}
|
|
|
|
static multipart_parser *
|
|
init_parser(void)
|
|
{
|
|
char *boundary;
|
|
const char *var;
|
|
|
|
multipart_parser *p;
|
|
static multipart_parser_settings s = {
|
|
.on_part_data = data_cb,
|
|
.on_headers_complete = data_begin_cb,
|
|
.on_part_data_end = data_end_cb,
|
|
.on_header_field = header_field,
|
|
.on_header_value = header_value
|
|
};
|
|
|
|
var = getenv("CONTENT_TYPE");
|
|
|
|
if (!var || strncmp(var, "multipart/form-data;", 20))
|
|
return NULL;
|
|
|
|
for (var += 20; *var && *var != '='; var++);
|
|
|
|
if (*var++ != '=')
|
|
return NULL;
|
|
|
|
boundary = malloc(strlen(var) + 3);
|
|
|
|
if (!boundary)
|
|
return NULL;
|
|
|
|
strcpy(boundary, "--");
|
|
strcpy(boundary + 2, var);
|
|
|
|
st.tempfd = -1;
|
|
st.filefd = -1;
|
|
st.filemode = 0600;
|
|
|
|
p = multipart_parser_init(boundary, &s);
|
|
|
|
free(boundary);
|
|
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
main_upload(int argc, char *argv[])
|
|
{
|
|
int rem, len;
|
|
char buf[4096];
|
|
multipart_parser *p;
|
|
|
|
p = init_parser();
|
|
|
|
if (!p)
|
|
{
|
|
errno = EINVAL;
|
|
return response(false, "Invalid request");
|
|
}
|
|
|
|
while ((len = read(0, buf, sizeof(buf))) > 0)
|
|
{
|
|
rem = multipart_parser_execute(p, buf, len);
|
|
|
|
if (rem < len)
|
|
break;
|
|
}
|
|
|
|
multipart_parser_free(p);
|
|
|
|
/* read remaining post data */
|
|
while ((len = read(0, buf, sizeof(buf))) > 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
main_backup(int argc, char **argv)
|
|
{
|
|
pid_t pid;
|
|
time_t now;
|
|
int len;
|
|
int status;
|
|
int fds[2];
|
|
char buf[4096];
|
|
char datestr[16] = { 0 };
|
|
char hostname[64] = { 0 };
|
|
char *fields[] = { "sessionid", NULL };
|
|
|
|
if (!postdecode(fields, 1) || !session_access(fields[1], "backup", "read"))
|
|
return failure(0, "Backup permission denied");
|
|
|
|
if (pipe(fds))
|
|
return failure(errno, "Failed to spawn pipe");
|
|
|
|
switch ((pid = fork()))
|
|
{
|
|
case -1:
|
|
return failure(errno, "Failed to fork process");
|
|
|
|
case 0:
|
|
dup2(fds[1], 1);
|
|
|
|
close(0);
|
|
close(2);
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
chdir("/");
|
|
|
|
execl("/sbin/sysupgrade", "/sbin/sysupgrade",
|
|
"--create-backup", "-", NULL);
|
|
|
|
return -1;
|
|
|
|
default:
|
|
fcntl(fds[0], F_SETFL, fcntl(fds[0], F_GETFL) | O_NONBLOCK);
|
|
now = time(NULL);
|
|
strftime(datestr, sizeof(datestr) - 1, "%Y-%m-%d", localtime(&now));
|
|
|
|
if (gethostname(hostname, sizeof(hostname) - 1))
|
|
sprintf(hostname, "OpenWrt");
|
|
|
|
printf("Status: 200 OK\r\n");
|
|
printf("Content-Type: application/x-targz\r\n");
|
|
printf("Content-Disposition: attachment; "
|
|
"filename=\"backup-%s-%s.tar.gz\"\r\n\r\n", hostname, datestr);
|
|
|
|
do {
|
|
waitpid(pid, &status, 0);
|
|
|
|
while ((len = read(fds[0], buf, sizeof(buf))) > 0) {
|
|
fwrite(buf, len, 1, stdout);
|
|
fflush(stdout);
|
|
}
|
|
|
|
} while (!WIFEXITED(status));
|
|
|
|
close(fds[0]);
|
|
close(fds[1]);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if (strstr(argv[0], "cgi-upload"))
|
|
return main_upload(argc, argv);
|
|
else if (strstr(argv[0], "cgi-backup"))
|
|
return main_backup(argc, argv);
|
|
|
|
return -1;
|
|
}
|