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Diffstat (limited to 'crypto/openssh/sftp-server.c')
-rw-r--r--crypto/openssh/sftp-server.c611
1 files changed, 349 insertions, 262 deletions
diff --git a/crypto/openssh/sftp-server.c b/crypto/openssh/sftp-server.c
index b8eb59c36a20..d1831bf8d8a3 100644
--- a/crypto/openssh/sftp-server.c
+++ b/crypto/openssh/sftp-server.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sftp-server.c,v 1.103 2014/01/17 06:23:24 dtucker Exp $ */
+/* $OpenBSD: sftp-server.c,v 1.106 2015/04/24 01:36:01 deraadt Exp $ */
/*
* Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
*
@@ -17,8 +17,8 @@
#include "includes.h"
+#include <sys/param.h> /* MIN */
#include <sys/types.h>
-#include <sys/param.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
@@ -29,6 +29,9 @@
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#endif
#include <dirent.h>
#include <errno.h>
@@ -37,13 +40,13 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
-#include <pwd.h>
#include <time.h>
#include <unistd.h>
#include <stdarg.h>
#include "xmalloc.h"
-#include "buffer.h"
+#include "sshbuf.h"
+#include "ssherr.h"
#include "log.h"
#include "misc.h"
#include "match.h"
@@ -52,11 +55,6 @@
#include "sftp.h"
#include "sftp-common.h"
-/* helper */
-#define get_int64() buffer_get_int64(&iqueue);
-#define get_int() buffer_get_int(&iqueue);
-#define get_string(lenp) buffer_get_string(&iqueue, lenp);
-
/* Our verbosity */
static LogLevel log_level = SYSLOG_LEVEL_ERROR;
@@ -65,8 +63,8 @@ static struct passwd *pw = NULL;
static char *client_addr = NULL;
/* input and output queue */
-static Buffer iqueue;
-static Buffer oqueue;
+struct sshbuf *iqueue;
+struct sshbuf *oqueue;
/* Version of client */
static u_int version;
@@ -272,12 +270,6 @@ string_from_portable(int pflags)
return ret;
}
-static Attrib *
-get_attrib(void)
-{
- return decode_attrib(&iqueue);
-}
-
/* handle handles */
typedef struct Handle Handle;
@@ -317,7 +309,7 @@ handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
if (num_handles + 1 <= num_handles)
return -1;
num_handles++;
- handles = xrealloc(handles, num_handles, sizeof(Handle));
+ handles = xreallocarray(handles, num_handles, sizeof(Handle));
handle_unused(num_handles - 1);
}
@@ -341,7 +333,7 @@ handle_is_ok(int i, int type)
}
static int
-handle_to_string(int handle, char **stringp, int *hlenp)
+handle_to_string(int handle, u_char **stringp, int *hlenp)
{
if (stringp == NULL || hlenp == NULL)
return -1;
@@ -352,7 +344,7 @@ handle_to_string(int handle, char **stringp, int *hlenp)
}
static int
-handle_from_string(const char *handle, u_int hlen)
+handle_from_string(const u_char *handle, u_int hlen)
{
int val;
@@ -474,29 +466,31 @@ handle_log_exit(void)
}
static int
-get_handle(void)
+get_handle(struct sshbuf *queue, int *hp)
{
- char *handle;
- int val = -1;
- u_int hlen;
+ u_char *handle;
+ int r;
+ size_t hlen;
- handle = get_string(&hlen);
+ *hp = -1;
+ if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
+ return r;
if (hlen < 256)
- val = handle_from_string(handle, hlen);
+ *hp = handle_from_string(handle, hlen);
free(handle);
- return val;
+ return 0;
}
/* send replies */
static void
-send_msg(Buffer *m)
+send_msg(struct sshbuf *m)
{
- int mlen = buffer_len(m);
+ int r;
- buffer_put_int(&oqueue, mlen);
- buffer_append(&oqueue, buffer_ptr(m), mlen);
- buffer_consume(m, mlen);
+ if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ sshbuf_reset(m);
}
static const char *
@@ -520,38 +514,46 @@ status_to_message(u_int32_t status)
static void
send_status(u_int32_t id, u_int32_t status)
{
- Buffer msg;
+ struct sshbuf *msg;
+ int r;
debug3("request %u: sent status %u", id, status);
if (log_level > SYSLOG_LEVEL_VERBOSE ||
(status != SSH2_FX_OK && status != SSH2_FX_EOF))
logit("sent status %s", status_to_message(status));
- buffer_init(&msg);
- buffer_put_char(&msg, SSH2_FXP_STATUS);
- buffer_put_int(&msg, id);
- buffer_put_int(&msg, status);
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
+ (r = sshbuf_put_u32(msg, id)) != 0 ||
+ (r = sshbuf_put_u32(msg, status)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
if (version >= 3) {
- buffer_put_cstring(&msg, status_to_message(status));
- buffer_put_cstring(&msg, "");
+ if ((r = sshbuf_put_cstring(msg,
+ status_to_message(status))) != 0 ||
+ (r = sshbuf_put_cstring(msg, "")) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
- send_msg(&msg);
- buffer_free(&msg);
+ send_msg(msg);
+ sshbuf_free(msg);
}
static void
-send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
+send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
{
- Buffer msg;
-
- buffer_init(&msg);
- buffer_put_char(&msg, type);
- buffer_put_int(&msg, id);
- buffer_put_string(&msg, data, dlen);
- send_msg(&msg);
- buffer_free(&msg);
+ struct sshbuf *msg;
+ int r;
+
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, type)) != 0 ||
+ (r = sshbuf_put_u32(msg, id)) != 0 ||
+ (r = sshbuf_put_string(msg, data, dlen)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ send_msg(msg);
+ sshbuf_free(msg);
}
static void
-send_data(u_int32_t id, const char *data, int dlen)
+send_data(u_int32_t id, const u_char *data, int dlen)
{
debug("request %u: sent data len %d", id, dlen);
send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
@@ -560,7 +562,7 @@ send_data(u_int32_t id, const char *data, int dlen)
static void
send_handle(u_int32_t id, int handle)
{
- char *string;
+ u_char *string;
int hlen;
handle_to_string(handle, &string, &hlen);
@@ -572,62 +574,71 @@ send_handle(u_int32_t id, int handle)
static void
send_names(u_int32_t id, int count, const Stat *stats)
{
- Buffer msg;
- int i;
-
- buffer_init(&msg);
- buffer_put_char(&msg, SSH2_FXP_NAME);
- buffer_put_int(&msg, id);
- buffer_put_int(&msg, count);
+ struct sshbuf *msg;
+ int i, r;
+
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
+ (r = sshbuf_put_u32(msg, id)) != 0 ||
+ (r = sshbuf_put_u32(msg, count)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: sent names count %d", id, count);
for (i = 0; i < count; i++) {
- buffer_put_cstring(&msg, stats[i].name);
- buffer_put_cstring(&msg, stats[i].long_name);
- encode_attrib(&msg, &stats[i].attrib);
+ if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
+ (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
+ (r = encode_attrib(msg, &stats[i].attrib)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
- send_msg(&msg);
- buffer_free(&msg);
+ send_msg(msg);
+ sshbuf_free(msg);
}
static void
send_attrib(u_int32_t id, const Attrib *a)
{
- Buffer msg;
+ struct sshbuf *msg;
+ int r;
debug("request %u: sent attrib have 0x%x", id, a->flags);
- buffer_init(&msg);
- buffer_put_char(&msg, SSH2_FXP_ATTRS);
- buffer_put_int(&msg, id);
- encode_attrib(&msg, a);
- send_msg(&msg);
- buffer_free(&msg);
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
+ (r = sshbuf_put_u32(msg, id)) != 0 ||
+ (r = encode_attrib(msg, a)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ send_msg(msg);
+ sshbuf_free(msg);
}
static void
send_statvfs(u_int32_t id, struct statvfs *st)
{
- Buffer msg;
+ struct sshbuf *msg;
u_int64_t flag;
+ int r;
flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
- buffer_init(&msg);
- buffer_put_char(&msg, SSH2_FXP_EXTENDED_REPLY);
- buffer_put_int(&msg, id);
- buffer_put_int64(&msg, st->f_bsize);
- buffer_put_int64(&msg, st->f_frsize);
- buffer_put_int64(&msg, st->f_blocks);
- buffer_put_int64(&msg, st->f_bfree);
- buffer_put_int64(&msg, st->f_bavail);
- buffer_put_int64(&msg, st->f_files);
- buffer_put_int64(&msg, st->f_ffree);
- buffer_put_int64(&msg, st->f_favail);
- buffer_put_int64(&msg, FSID_TO_ULONG(st->f_fsid));
- buffer_put_int64(&msg, flag);
- buffer_put_int64(&msg, st->f_namemax);
- send_msg(&msg);
- buffer_free(&msg);
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
+ (r = sshbuf_put_u32(msg, id)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
+ (r = sshbuf_put_u64(msg, FSID_TO_ULONG(st->f_fsid))) != 0 ||
+ (r = sshbuf_put_u64(msg, flag)) != 0 ||
+ (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ send_msg(msg);
+ sshbuf_free(msg);
}
/* parse incoming */
@@ -635,53 +646,59 @@ send_statvfs(u_int32_t id, struct statvfs *st)
static void
process_init(void)
{
- Buffer msg;
+ struct sshbuf *msg;
+ int r;
- version = get_int();
+ if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
verbose("received client version %u", version);
- buffer_init(&msg);
- buffer_put_char(&msg, SSH2_FXP_VERSION);
- buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
- /* POSIX rename extension */
- buffer_put_cstring(&msg, "posix-rename@openssh.com");
- buffer_put_cstring(&msg, "1"); /* version */
- /* statvfs extension */
- buffer_put_cstring(&msg, "statvfs@openssh.com");
- buffer_put_cstring(&msg, "2"); /* version */
- /* fstatvfs extension */
- buffer_put_cstring(&msg, "fstatvfs@openssh.com");
- buffer_put_cstring(&msg, "2"); /* version */
- /* hardlink extension */
- buffer_put_cstring(&msg, "hardlink@openssh.com");
- buffer_put_cstring(&msg, "1"); /* version */
- /* fsync extension */
- buffer_put_cstring(&msg, "fsync@openssh.com");
- buffer_put_cstring(&msg, "1"); /* version */
- send_msg(&msg);
- buffer_free(&msg);
+ if ((msg = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
+ (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
+ /* POSIX rename extension */
+ (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
+ (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
+ /* statvfs extension */
+ (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
+ (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
+ /* fstatvfs extension */
+ (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
+ (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
+ /* hardlink extension */
+ (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
+ (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
+ /* fsync extension */
+ (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
+ (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ send_msg(msg);
+ sshbuf_free(msg);
}
static void
process_open(u_int32_t id)
{
u_int32_t pflags;
- Attrib *a;
+ Attrib a;
char *name;
- int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
+ int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
+
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
+ (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
+ (r = decode_attrib(iqueue, &a)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- name = get_string(NULL);
- pflags = get_int(); /* portable flags */
debug3("request %u: open flags %d", id, pflags);
- a = get_attrib();
flags = flags_from_portable(pflags);
- mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
+ mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
logit("open \"%s\" flags %s mode 0%o",
name, string_from_portable(pflags), mode);
if (readonly &&
((flags & O_ACCMODE) == O_WRONLY ||
(flags & O_ACCMODE) == O_RDWR)) {
verbose("Refusing open request in read-only mode");
- status = SSH2_FX_PERMISSION_DENIED;
+ status = SSH2_FX_PERMISSION_DENIED;
} else {
fd = open(name, flags, mode);
if (fd < 0) {
@@ -704,9 +721,11 @@ process_open(u_int32_t id)
static void
process_close(u_int32_t id)
{
- int handle, ret, status = SSH2_FX_FAILURE;
+ int r, handle, ret, status = SSH2_FX_FAILURE;
+
+ if ((r = get_handle(iqueue, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- handle = get_handle();
debug3("request %u: close handle %u", id, handle);
handle_log_close(handle, NULL);
ret = handle_close(handle);
@@ -717,14 +736,15 @@ process_close(u_int32_t id)
static void
process_read(u_int32_t id)
{
- char buf[64*1024];
+ u_char buf[64*1024];
u_int32_t len;
- int handle, fd, ret, status = SSH2_FX_FAILURE;
+ int r, handle, fd, ret, status = SSH2_FX_FAILURE;
u_int64_t off;
- handle = get_handle();
- off = get_int64();
- len = get_int();
+ if ((r = get_handle(iqueue, &handle)) != 0 ||
+ (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
+ (r = sshbuf_get_u32(iqueue, &len)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: read \"%s\" (handle %d) off %llu len %d",
id, handle_to_name(handle), handle, (unsigned long long)off, len);
@@ -758,18 +778,19 @@ static void
process_write(u_int32_t id)
{
u_int64_t off;
- u_int len;
- int handle, fd, ret, status;
- char *data;
+ size_t len;
+ int r, handle, fd, ret, status;
+ u_char *data;
- handle = get_handle();
- off = get_int64();
- data = get_string(&len);
+ if ((r = get_handle(iqueue, &handle)) != 0 ||
+ (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
+ (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- debug("request %u: write \"%s\" (handle %d) off %llu len %d",
+ debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
id, handle_to_name(handle), handle, (unsigned long long)off, len);
fd = handle_to_fd(handle);
-
+
if (fd < 0)
status = SSH2_FX_FAILURE;
else {
@@ -802,13 +823,15 @@ process_do_stat(u_int32_t id, int do_lstat)
Attrib a;
struct stat st;
char *name;
- int ret, status = SSH2_FX_FAILURE;
+ int r, status = SSH2_FX_FAILURE;
+
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- name = get_string(NULL);
debug3("request %u: %sstat", id, do_lstat ? "l" : "");
verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
- ret = do_lstat ? lstat(name, &st) : stat(name, &st);
- if (ret < 0) {
+ r = do_lstat ? lstat(name, &st) : stat(name, &st);
+ if (r < 0) {
status = errno_to_portable(errno);
} else {
stat_to_attrib(&st, &a);
@@ -837,15 +860,16 @@ process_fstat(u_int32_t id)
{
Attrib a;
struct stat st;
- int fd, ret, handle, status = SSH2_FX_FAILURE;
+ int fd, r, handle, status = SSH2_FX_FAILURE;
- handle = get_handle();
+ if ((r = get_handle(iqueue, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: fstat \"%s\" (handle %u)",
id, handle_to_name(handle), handle);
fd = handle_to_fd(handle);
if (fd >= 0) {
- ret = fstat(fd, &st);
- if (ret < 0) {
+ r = fstat(fd, &st);
+ if (r < 0) {
status = errno_to_portable(errno);
} else {
stat_to_attrib(&st, &a);
@@ -872,42 +896,44 @@ attrib_to_tv(const Attrib *a)
static void
process_setstat(u_int32_t id)
{
- Attrib *a;
+ Attrib a;
char *name;
- int status = SSH2_FX_OK, ret;
+ int r, status = SSH2_FX_OK;
+
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
+ (r = decode_attrib(iqueue, &a)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- name = get_string(NULL);
- a = get_attrib();
debug("request %u: setstat name \"%s\"", id, name);
- if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
+ if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
logit("set \"%s\" size %llu",
- name, (unsigned long long)a->size);
- ret = truncate(name, a->size);
- if (ret == -1)
+ name, (unsigned long long)a.size);
+ r = truncate(name, a.size);
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
- logit("set \"%s\" mode %04o", name, a->perm);
- ret = chmod(name, a->perm & 07777);
- if (ret == -1)
+ if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
+ logit("set \"%s\" mode %04o", name, a.perm);
+ r = chmod(name, a.perm & 07777);
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
+ if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
char buf[64];
- time_t t = a->mtime;
+ time_t t = a.mtime;
strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
localtime(&t));
logit("set \"%s\" modtime %s", name, buf);
- ret = utimes(name, attrib_to_tv(a));
- if (ret == -1)
+ r = utimes(name, attrib_to_tv(&a));
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
+ if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
logit("set \"%s\" owner %lu group %lu", name,
- (u_long)a->uid, (u_long)a->gid);
- ret = chown(name, a->uid, a->gid);
- if (ret == -1)
+ (u_long)a.uid, (u_long)a.gid);
+ r = chown(name, a.uid, a.gid);
+ if (r == -1)
status = errno_to_portable(errno);
}
send_status(id, status);
@@ -917,12 +943,14 @@ process_setstat(u_int32_t id)
static void
process_fsetstat(u_int32_t id)
{
- Attrib *a;
- int handle, fd, ret;
+ Attrib a;
+ int handle, fd, r;
int status = SSH2_FX_OK;
- handle = get_handle();
- a = get_attrib();
+ if ((r = get_handle(iqueue, &handle)) != 0 ||
+ (r = decode_attrib(iqueue, &a)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
debug("request %u: fsetstat handle %d", id, handle);
fd = handle_to_fd(handle);
if (fd < 0)
@@ -930,47 +958,47 @@ process_fsetstat(u_int32_t id)
else {
char *name = handle_to_name(handle);
- if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
+ if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
logit("set \"%s\" size %llu",
- name, (unsigned long long)a->size);
- ret = ftruncate(fd, a->size);
- if (ret == -1)
+ name, (unsigned long long)a.size);
+ r = ftruncate(fd, a.size);
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
- logit("set \"%s\" mode %04o", name, a->perm);
+ if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
+ logit("set \"%s\" mode %04o", name, a.perm);
#ifdef HAVE_FCHMOD
- ret = fchmod(fd, a->perm & 07777);
+ r = fchmod(fd, a.perm & 07777);
#else
- ret = chmod(name, a->perm & 07777);
+ r = chmod(name, a.perm & 07777);
#endif
- if (ret == -1)
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
+ if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
char buf[64];
- time_t t = a->mtime;
+ time_t t = a.mtime;
strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
localtime(&t));
logit("set \"%s\" modtime %s", name, buf);
#ifdef HAVE_FUTIMES
- ret = futimes(fd, attrib_to_tv(a));
+ r = futimes(fd, attrib_to_tv(&a));
#else
- ret = utimes(name, attrib_to_tv(a));
+ r = utimes(name, attrib_to_tv(&a));
#endif
- if (ret == -1)
+ if (r == -1)
status = errno_to_portable(errno);
}
- if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
+ if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
logit("set \"%s\" owner %lu group %lu", name,
- (u_long)a->uid, (u_long)a->gid);
+ (u_long)a.uid, (u_long)a.gid);
#ifdef HAVE_FCHOWN
- ret = fchown(fd, a->uid, a->gid);
+ r = fchown(fd, a.uid, a.gid);
#else
- ret = chown(name, a->uid, a->gid);
+ r = chown(name, a.uid, a.gid);
#endif
- if (ret == -1)
+ if (r == -1)
status = errno_to_portable(errno);
}
}
@@ -982,9 +1010,11 @@ process_opendir(u_int32_t id)
{
DIR *dirp = NULL;
char *path;
- int handle, status = SSH2_FX_FAILURE;
+ int r, handle, status = SSH2_FX_FAILURE;
+
+ if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- path = get_string(NULL);
debug3("request %u: opendir", id);
logit("opendir \"%s\"", path);
dirp = opendir(path);
@@ -1011,9 +1041,11 @@ process_readdir(u_int32_t id)
DIR *dirp;
struct dirent *dp;
char *path;
- int handle;
+ int r, handle;
+
+ if ((r = get_handle(iqueue, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- handle = get_handle();
debug("request %u: readdir \"%s\" (handle %d)", id,
handle_to_name(handle), handle);
dirp = handle_to_dir(handle);
@@ -1022,7 +1054,7 @@ process_readdir(u_int32_t id)
send_status(id, SSH2_FX_FAILURE);
} else {
struct stat st;
- char pathname[MAXPATHLEN];
+ char pathname[PATH_MAX];
Stat *stats;
int nstats = 10, count = 0, i;
@@ -1030,7 +1062,7 @@ process_readdir(u_int32_t id)
while ((dp = readdir(dirp)) != NULL) {
if (count >= nstats) {
nstats *= 2;
- stats = xrealloc(stats, nstats, sizeof(Stat));
+ stats = xreallocarray(stats, nstats, sizeof(Stat));
}
/* XXX OVERFLOW ? */
snprintf(pathname, sizeof pathname, "%s%s%s", path,
@@ -1063,14 +1095,15 @@ static void
process_remove(u_int32_t id)
{
char *name;
- int status = SSH2_FX_FAILURE;
- int ret;
+ int r, status = SSH2_FX_FAILURE;
+
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- name = get_string(NULL);
debug3("request %u: remove", id);
logit("remove name \"%s\"", name);
- ret = unlink(name);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = unlink(name);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(name);
}
@@ -1078,18 +1111,20 @@ process_remove(u_int32_t id)
static void
process_mkdir(u_int32_t id)
{
- Attrib *a;
+ Attrib a;
char *name;
- int ret, mode, status = SSH2_FX_FAILURE;
+ int r, mode, status = SSH2_FX_FAILURE;
- name = get_string(NULL);
- a = get_attrib();
- mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
- a->perm & 07777 : 0777;
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
+ (r = decode_attrib(iqueue, &a)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
+ a.perm & 07777 : 0777;
debug3("request %u: mkdir", id);
logit("mkdir name \"%s\" mode 0%o", name, mode);
- ret = mkdir(name, mode);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = mkdir(name, mode);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(name);
}
@@ -1098,13 +1133,15 @@ static void
process_rmdir(u_int32_t id)
{
char *name;
- int ret, status;
+ int r, status;
+
+ if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- name = get_string(NULL);
debug3("request %u: rmdir", id);
logit("rmdir name \"%s\"", name);
- ret = rmdir(name);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = rmdir(name);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(name);
}
@@ -1112,10 +1149,13 @@ process_rmdir(u_int32_t id)
static void
process_realpath(u_int32_t id)
{
- char resolvedname[MAXPATHLEN];
+ char resolvedname[PATH_MAX];
char *path;
+ int r;
+
+ if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- path = get_string(NULL);
if (path[0] == '\0') {
free(path);
path = xstrdup(".");
@@ -1137,11 +1177,13 @@ static void
process_rename(u_int32_t id)
{
char *oldpath, *newpath;
- int status;
+ int r, status;
struct stat sb;
- oldpath = get_string(NULL);
- newpath = get_string(NULL);
+ if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
debug3("request %u: rename", id);
logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
status = SSH2_FX_FAILURE;
@@ -1194,11 +1236,13 @@ process_rename(u_int32_t id)
static void
process_readlink(u_int32_t id)
{
- int len;
- char buf[MAXPATHLEN];
+ int r, len;
+ char buf[PATH_MAX];
char *path;
- path = get_string(NULL);
+ if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
debug3("request %u: readlink", id);
verbose("readlink \"%s\"", path);
if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
@@ -1218,15 +1262,17 @@ static void
process_symlink(u_int32_t id)
{
char *oldpath, *newpath;
- int ret, status;
+ int r, status;
+
+ if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- oldpath = get_string(NULL);
- newpath = get_string(NULL);
debug3("request %u: symlink", id);
logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
/* this will fail if 'newpath' exists */
- ret = symlink(oldpath, newpath);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = symlink(oldpath, newpath);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(oldpath);
free(newpath);
@@ -1236,14 +1282,16 @@ static void
process_extended_posix_rename(u_int32_t id)
{
char *oldpath, *newpath;
- int ret, status;
+ int r, status;
+
+ if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- oldpath = get_string(NULL);
- newpath = get_string(NULL);
debug3("request %u: posix-rename", id);
logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
- ret = rename(oldpath, newpath);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = rename(oldpath, newpath);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(oldpath);
free(newpath);
@@ -1254,8 +1302,10 @@ process_extended_statvfs(u_int32_t id)
{
char *path;
struct statvfs st;
+ int r;
- path = get_string(NULL);
+ if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("request %u: statvfs", id);
logit("statvfs \"%s\"", path);
@@ -1269,10 +1319,11 @@ process_extended_statvfs(u_int32_t id)
static void
process_extended_fstatvfs(u_int32_t id)
{
- int handle, fd;
+ int r, handle, fd;
struct statvfs st;
- handle = get_handle();
+ if ((r = get_handle(iqueue, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: fstatvfs \"%s\" (handle %u)",
id, handle_to_name(handle), handle);
if ((fd = handle_to_fd(handle)) < 0) {
@@ -1289,14 +1340,16 @@ static void
process_extended_hardlink(u_int32_t id)
{
char *oldpath, *newpath;
- int ret, status;
+ int r, status;
+
+ if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
- oldpath = get_string(NULL);
- newpath = get_string(NULL);
debug3("request %u: hardlink", id);
logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
- ret = link(oldpath, newpath);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = link(oldpath, newpath);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
free(oldpath);
free(newpath);
@@ -1305,16 +1358,17 @@ process_extended_hardlink(u_int32_t id)
static void
process_extended_fsync(u_int32_t id)
{
- int handle, fd, ret, status = SSH2_FX_OP_UNSUPPORTED;
+ int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
- handle = get_handle();
+ if ((r = get_handle(iqueue, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug3("request %u: fsync (handle %u)", id, handle);
verbose("fsync \"%s\"", handle_to_name(handle));
if ((fd = handle_to_fd(handle)) < 0)
status = SSH2_FX_NO_SUCH_FILE;
else if (handle_is_ok(handle, HANDLE_FILE)) {
- ret = fsync(fd);
- status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
+ r = fsync(fd);
+ status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
}
send_status(id, status);
}
@@ -1323,9 +1377,10 @@ static void
process_extended(u_int32_t id)
{
char *request;
- u_int i;
+ int i, r;
- request = get_string(NULL);
+ if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
for (i = 0; extended_handlers[i].handler != NULL; i++) {
if (strcmp(request, extended_handlers[i].ext_name) == 0) {
if (!request_permitted(&extended_handlers[i]))
@@ -1347,14 +1402,18 @@ process_extended(u_int32_t id)
static void
process(void)
{
- u_int msg_len, buf_len, consumed, type, i;
- u_char *cp;
+ u_int msg_len;
+ u_int buf_len;
+ u_int consumed;
+ u_char type;
+ const u_char *cp;
+ int i, r;
u_int32_t id;
- buf_len = buffer_len(&iqueue);
+ buf_len = sshbuf_len(iqueue);
if (buf_len < 5)
return; /* Incomplete message. */
- cp = buffer_ptr(&iqueue);
+ cp = sshbuf_ptr(iqueue);
msg_len = get_u32(cp);
if (msg_len > SFTP_MAX_MSG_LENGTH) {
error("bad message from %s local user %s",
@@ -1363,9 +1422,11 @@ process(void)
}
if (buf_len < msg_len + 4)
return;
- buffer_consume(&iqueue, 4);
+ if ((r = sshbuf_consume(iqueue, 4)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
buf_len -= 4;
- type = buffer_get_char(&iqueue);
+ if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
switch (type) {
case SSH2_FXP_INIT:
@@ -1375,13 +1436,15 @@ process(void)
case SSH2_FXP_EXTENDED:
if (!init_done)
fatal("Received extended request before init");
- id = get_int();
+ if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
process_extended(id);
break;
default:
if (!init_done)
fatal("Received %u request before init", type);
- id = get_int();
+ if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
for (i = 0; handlers[i].handler != NULL; i++) {
if (type == handlers[i].type) {
if (!request_permitted(&handlers[i])) {
@@ -1397,17 +1460,18 @@ process(void)
error("Unknown message %u", type);
}
/* discard the remaining bytes from the current packet */
- if (buf_len < buffer_len(&iqueue)) {
+ if (buf_len < sshbuf_len(iqueue)) {
error("iqueue grew unexpectedly");
sftp_server_cleanup_exit(255);
}
- consumed = buf_len - buffer_len(&iqueue);
+ consumed = buf_len - sshbuf_len(iqueue);
if (msg_len < consumed) {
error("msg_len %u < consumed %u", msg_len, consumed);
sftp_server_cleanup_exit(255);
}
- if (msg_len > consumed)
- buffer_consume(&iqueue, msg_len - consumed);
+ if (msg_len > consumed &&
+ (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
}
/* Cleanup handler that logs active handles upon normal exit */
@@ -1440,7 +1504,7 @@ int
sftp_server_main(int argc, char **argv, struct passwd *user_pw)
{
fd_set *rset, *wset;
- int i, in, out, max, ch, skipargs = 0, log_stderr = 0;
+ int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
ssize_t len, olen, set_size;
SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
char *cp, *homedir = NULL, buf[4*4096];
@@ -1523,6 +1587,17 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
log_init(__progname, log_level, log_facility, log_stderr);
+#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
+ /*
+ * On Linux, we should try to avoid making /proc/self/{mem,maps}
+ * available to the user so that sftp access doesn't automatically
+ * imply arbitrary code execution access that will break
+ * restricted configurations.
+ */
+ if (prctl(PR_SET_DUMPABLE, 0) != 0)
+ fatal("unable to make the process undumpable");
+#endif /* defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) */
+
if ((cp = getenv("SSH_CONNECTION")) != NULL) {
client_addr = xstrdup(cp);
if ((cp = strchr(client_addr, ' ')) == NULL) {
@@ -1551,8 +1626,10 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
if (out > max)
max = out;
- buffer_init(&iqueue);
- buffer_init(&oqueue);
+ if ((iqueue = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((oqueue = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
rset = (fd_set *)xmalloc(set_size);
@@ -1574,11 +1651,15 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
* the worst-case length packet it can generate,
* otherwise apply backpressure by stopping reads.
*/
- if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
- buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
+ if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
+ (r = sshbuf_check_reserve(oqueue,
+ SFTP_MAX_MSG_LENGTH)) == 0)
FD_SET(in, rset);
+ else if (r != SSH_ERR_NO_BUFFER_SPACE)
+ fatal("%s: sshbuf_check_reserve failed: %s",
+ __func__, ssh_err(r));
- olen = buffer_len(&oqueue);
+ olen = sshbuf_len(oqueue);
if (olen > 0)
FD_SET(out, wset);
@@ -1598,18 +1679,20 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
} else if (len < 0) {
error("read: %s", strerror(errno));
sftp_server_cleanup_exit(1);
- } else {
- buffer_append(&iqueue, buf, len);
+ } else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
+ fatal("%s: buffer error: %s",
+ __func__, ssh_err(r));
}
}
/* send oqueue to stdout */
if (FD_ISSET(out, wset)) {
- len = write(out, buffer_ptr(&oqueue), olen);
+ len = write(out, sshbuf_ptr(oqueue), olen);
if (len < 0) {
error("write: %s", strerror(errno));
sftp_server_cleanup_exit(1);
- } else {
- buffer_consume(&oqueue, len);
+ } else if ((r = sshbuf_consume(oqueue, len)) != 0) {
+ fatal("%s: buffer error: %s",
+ __func__, ssh_err(r));
}
}
@@ -1618,7 +1701,11 @@ sftp_server_main(int argc, char **argv, struct passwd *user_pw)
* into the output buffer, otherwise stop processing input
* and let the output queue drain.
*/
- if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
+ r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
+ if (r == 0)
process();
+ else if (r != SSH_ERR_NO_BUFFER_SPACE)
+ fatal("%s: sshbuf_check_reserve: %s",
+ __func__, ssh_err(r));
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 14:49:28 +0000