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sftp-client.c
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/* $OpenBSD: sftp-client.c,v 1.176 2024/05/17 02:39:11 jsg Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <[email protected]>
*
* 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 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.
*/
/* XXX: memleaks */
/* XXX: signed vs unsigned */
/* XXX: remove all logging, only return status codes */
/* XXX: copy between two remote sites */
#include "includes.h"
#include <sys/types.h>
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#include "openbsd-compat/sys-queue.h"
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/uio.h>
#include <dirent.h>
#include <errno.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#endif
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "xmalloc.h"
#include "ssherr.h"
#include "sshbuf.h"
#include "log.h"
#include "atomicio.h"
#include "progressmeter.h"
#include "misc.h"
#include "utf8.h"
#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
extern volatile sig_atomic_t interrupted;
extern int showprogress;
/* Default size of buffer for up/download (fix sftp.1 scp.1 if changed) */
#define DEFAULT_COPY_BUFLEN 32768
/* Default number of concurrent xfer requests (fix sftp.1 scp.1 if changed) */
#define DEFAULT_NUM_REQUESTS 64
/* Minimum amount of data to read at a time */
#define MIN_READ_SIZE 512
/* Maximum depth to descend in directory trees */
#define MAX_DIR_DEPTH 64
/* Directory separator characters */
#ifdef HAVE_CYGWIN
# define SFTP_DIRECTORY_CHARS "/\\"
#else /* HAVE_CYGWIN */
# define SFTP_DIRECTORY_CHARS "/"
#endif /* HAVE_CYGWIN */
struct sftp_conn {
int fd_in;
int fd_out;
u_int download_buflen;
u_int upload_buflen;
u_int num_requests;
u_int version;
u_int msg_id;
#define SFTP_EXT_POSIX_RENAME 0x00000001
#define SFTP_EXT_STATVFS 0x00000002
#define SFTP_EXT_FSTATVFS 0x00000004
#define SFTP_EXT_HARDLINK 0x00000008
#define SFTP_EXT_FSYNC 0x00000010
#define SFTP_EXT_LSETSTAT 0x00000020
#define SFTP_EXT_LIMITS 0x00000040
#define SFTP_EXT_PATH_EXPAND 0x00000080
#define SFTP_EXT_COPY_DATA 0x00000100
#define SFTP_EXT_GETUSERSGROUPS_BY_ID 0x00000200
u_int exts;
u_int64_t limit_kbps;
struct bwlimit bwlimit_in, bwlimit_out;
};
/* Tracks in-progress requests during file transfers */
struct request {
u_int id;
size_t len;
u_int64_t offset;
TAILQ_ENTRY(request) tq;
};
TAILQ_HEAD(requests, request);
static u_char *
get_handle(struct sftp_conn *conn, u_int expected_id, size_t *len,
const char *errfmt, ...) __attribute__((format(printf, 4, 5)));
static struct request *
request_enqueue(struct requests *requests, u_int id, size_t len,
uint64_t offset)
{
struct request *req;
req = xcalloc(1, sizeof(*req));
req->id = id;
req->len = len;
req->offset = offset;
TAILQ_INSERT_TAIL(requests, req, tq);
return req;
}
static struct request *
request_find(struct requests *requests, u_int id)
{
struct request *req;
for (req = TAILQ_FIRST(requests);
req != NULL && req->id != id;
req = TAILQ_NEXT(req, tq))
;
return req;
}
static int
sftpio(void *_bwlimit, size_t amount)
{
struct bwlimit *bwlimit = (struct bwlimit *)_bwlimit;
refresh_progress_meter(0);
if (bwlimit != NULL)
bandwidth_limit(bwlimit, amount);
return 0;
}
static void
send_msg(struct sftp_conn *conn, struct sshbuf *m)
{
u_char mlen[4];
struct iovec iov[2];
if (sshbuf_len(m) > SFTP_MAX_MSG_LENGTH)
fatal("Outbound message too long %zu", sshbuf_len(m));
/* Send length first */
put_u32(mlen, sshbuf_len(m));
iov[0].iov_base = mlen;
iov[0].iov_len = sizeof(mlen);
iov[1].iov_base = (u_char *)sshbuf_ptr(m);
iov[1].iov_len = sshbuf_len(m);
if (atomiciov6(writev, conn->fd_out, iov, 2, sftpio,
conn->limit_kbps > 0 ? &conn->bwlimit_out : NULL) !=
sshbuf_len(m) + sizeof(mlen))
fatal("Couldn't send packet: %s", strerror(errno));
sshbuf_reset(m);
}
static void
get_msg_extended(struct sftp_conn *conn, struct sshbuf *m, int initial)
{
u_int msg_len;
u_char *p;
int r;
sshbuf_reset(m);
if ((r = sshbuf_reserve(m, 4, &p)) != 0)
fatal_fr(r, "reserve");
if (atomicio6(read, conn->fd_in, p, 4, sftpio,
conn->limit_kbps > 0 ? &conn->bwlimit_in : NULL) != 4) {
if (errno == EPIPE || errno == ECONNRESET)
fatal("Connection closed");
else
fatal("Couldn't read packet: %s", strerror(errno));
}
if ((r = sshbuf_get_u32(m, &msg_len)) != 0)
fatal_fr(r, "sshbuf_get_u32");
if (msg_len > SFTP_MAX_MSG_LENGTH) {
do_log2(initial ? SYSLOG_LEVEL_ERROR : SYSLOG_LEVEL_FATAL,
"Received message too long %u", msg_len);
fatal("Ensure the remote shell produces no output "
"for non-interactive sessions.");
}
if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
fatal_fr(r, "reserve");
if (atomicio6(read, conn->fd_in, p, msg_len, sftpio,
conn->limit_kbps > 0 ? &conn->bwlimit_in : NULL)
!= msg_len) {
if (errno == EPIPE)
fatal("Connection closed");
else
fatal("Read packet: %s", strerror(errno));
}
}
static void
get_msg(struct sftp_conn *conn, struct sshbuf *m)
{
get_msg_extended(conn, m, 0);
}
static void
send_string_request(struct sftp_conn *conn, u_int id, u_int code, const char *s,
u_int len)
{
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_put_u8(msg, code)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_string(msg, s, len)) != 0)
fatal_fr(r, "compose");
send_msg(conn, msg);
debug3("Sent message fd %d T:%u I:%u", conn->fd_out, code, id);
sshbuf_free(msg);
}
static void
send_string_attrs_request(struct sftp_conn *conn, u_int id, u_int code,
const void *s, u_int len, Attrib *a)
{
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_put_u8(msg, code)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_string(msg, s, len)) != 0 ||
(r = encode_attrib(msg, a)) != 0)
fatal_fr(r, "compose");
send_msg(conn, msg);
debug3("Sent message fd %d T:%u I:%u F:0x%04x M:%05o",
conn->fd_out, code, id, a->flags, a->perm);
sshbuf_free(msg);
}
static u_int
get_status(struct sftp_conn *conn, u_int expected_id)
{
struct sshbuf *msg;
u_char type;
u_int id, status;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &id)) != 0)
fatal_fr(r, "compose");
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type != SSH2_FXP_STATUS)
fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u",
SSH2_FXP_STATUS, type);
if ((r = sshbuf_get_u32(msg, &status)) != 0)
fatal_fr(r, "parse");
sshbuf_free(msg);
debug3("SSH2_FXP_STATUS %u", status);
return status;
}
static u_char *
get_handle(struct sftp_conn *conn, u_int expected_id, size_t *len,
const char *errfmt, ...)
{
struct sshbuf *msg;
u_int id, status;
u_char type;
u_char *handle;
char errmsg[256];
va_list args;
int r;
va_start(args, errfmt);
if (errfmt != NULL)
vsnprintf(errmsg, sizeof(errmsg), errfmt, args);
va_end(args);
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &id)) != 0)
fatal_fr(r, "parse");
if (id != expected_id)
fatal("%s: ID mismatch (%u != %u)",
errfmt == NULL ? __func__ : errmsg, id, expected_id);
if (type == SSH2_FXP_STATUS) {
if ((r = sshbuf_get_u32(msg, &status)) != 0)
fatal_fr(r, "parse status");
if (errfmt != NULL)
error("%s: %s", errmsg, fx2txt(status));
sshbuf_free(msg);
return(NULL);
} else if (type != SSH2_FXP_HANDLE)
fatal("%s: Expected SSH2_FXP_HANDLE(%u) packet, got %u",
errfmt == NULL ? __func__ : errmsg, SSH2_FXP_HANDLE, type);
if ((r = sshbuf_get_string(msg, &handle, len)) != 0)
fatal_fr(r, "parse handle");
sshbuf_free(msg);
return handle;
}
static int
get_decode_stat(struct sftp_conn *conn, u_int expected_id, int quiet, Attrib *a)
{
struct sshbuf *msg;
u_int id;
u_char type;
int r;
Attrib attr;
if (a != NULL)
memset(a, '\0', sizeof(*a));
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &id)) != 0)
fatal_fr(r, "parse");
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int status;
if ((r = sshbuf_get_u32(msg, &status)) != 0)
fatal_fr(r, "parse status");
if (quiet)
debug("stat remote: %s", fx2txt(status));
else
error("stat remote: %s", fx2txt(status));
sshbuf_free(msg);
return -1;
} else if (type != SSH2_FXP_ATTRS) {
fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u",
SSH2_FXP_ATTRS, type);
}
if ((r = decode_attrib(msg, &attr)) != 0) {
error_fr(r, "decode_attrib");
sshbuf_free(msg);
return -1;
}
/* success */
if (a != NULL)
*a = attr;
debug3("Received stat reply T:%u I:%u F:0x%04x M:%05o",
type, id, attr.flags, attr.perm);
sshbuf_free(msg);
return 0;
}
static int
get_decode_statvfs(struct sftp_conn *conn, struct sftp_statvfs *st,
u_int expected_id, int quiet)
{
struct sshbuf *msg;
u_char type;
u_int id;
u_int64_t flag;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &id)) != 0)
fatal_fr(r, "parse");
debug3("Received statvfs reply T:%u I:%u", type, id);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int status;
if ((r = sshbuf_get_u32(msg, &status)) != 0)
fatal_fr(r, "parse status");
if (quiet)
debug("remote statvfs: %s", fx2txt(status));
else
error("remote statvfs: %s", fx2txt(status));
sshbuf_free(msg);
return -1;
} else if (type != SSH2_FXP_EXTENDED_REPLY) {
fatal("Expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
SSH2_FXP_EXTENDED_REPLY, type);
}
memset(st, 0, sizeof(*st));
if ((r = sshbuf_get_u64(msg, &st->f_bsize)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_frsize)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_blocks)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_bfree)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_bavail)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_files)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_ffree)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_favail)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_fsid)) != 0 ||
(r = sshbuf_get_u64(msg, &flag)) != 0 ||
(r = sshbuf_get_u64(msg, &st->f_namemax)) != 0)
fatal_fr(r, "parse statvfs");
st->f_flag = (flag & SSH2_FXE_STATVFS_ST_RDONLY) ? ST_RDONLY : 0;
st->f_flag |= (flag & SSH2_FXE_STATVFS_ST_NOSUID) ? ST_NOSUID : 0;
sshbuf_free(msg);
return 0;
}
struct sftp_conn *
sftp_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests,
u_int64_t limit_kbps)
{
u_char type;
struct sshbuf *msg;
struct sftp_conn *ret;
int r;
ret = xcalloc(1, sizeof(*ret));
ret->msg_id = 1;
ret->fd_in = fd_in;
ret->fd_out = fd_out;
ret->download_buflen = ret->upload_buflen =
transfer_buflen ? transfer_buflen : DEFAULT_COPY_BUFLEN;
ret->num_requests =
num_requests ? num_requests : DEFAULT_NUM_REQUESTS;
ret->exts = 0;
ret->limit_kbps = 0;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_put_u8(msg, SSH2_FXP_INIT)) != 0 ||
(r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
fatal_fr(r, "parse");
send_msg(ret, msg);
get_msg_extended(ret, msg, 1);
/* Expecting a VERSION reply */
if ((r = sshbuf_get_u8(msg, &type)) != 0)
fatal_fr(r, "parse type");
if (type != SSH2_FXP_VERSION) {
error("Invalid packet back from SSH2_FXP_INIT (type %u)",
type);
sshbuf_free(msg);
free(ret);
return(NULL);
}
if ((r = sshbuf_get_u32(msg, &ret->version)) != 0)
fatal_fr(r, "parse version");
debug2("Remote version: %u", ret->version);
/* Check for extensions */
while (sshbuf_len(msg) > 0) {
char *name;
u_char *value;
size_t vlen;
int known = 0;
if ((r = sshbuf_get_cstring(msg, &name, NULL)) != 0 ||
(r = sshbuf_get_string(msg, &value, &vlen)) != 0)
fatal_fr(r, "parse extension");
if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_POSIX_RENAME;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "2") == 0) {
ret->exts |= SFTP_EXT_STATVFS;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "2") == 0) {
ret->exts |= SFTP_EXT_FSTATVFS;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_HARDLINK;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_FSYNC;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_LSETSTAT;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_LIMITS;
known = 1;
} else if (strcmp(name, "[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_PATH_EXPAND;
known = 1;
} else if (strcmp(name, "copy-data") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_COPY_DATA;
known = 1;
} else if (strcmp(name,
"[email protected]") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_GETUSERSGROUPS_BY_ID;
known = 1;
}
if (known) {
debug2("Server supports extension \"%s\" revision %s",
name, value);
} else {
debug2("Unrecognised server extension \"%s\"", name);
}
free(name);
free(value);
}
sshbuf_free(msg);
/* Query the server for its limits */
if (ret->exts & SFTP_EXT_LIMITS) {
struct sftp_limits limits;
if (sftp_get_limits(ret, &limits) != 0)
fatal_f("limits failed");
/* If the caller did not specify, find a good value */
if (transfer_buflen == 0) {
ret->download_buflen = MINIMUM(limits.read_length,
SFTP_MAX_MSG_LENGTH - 1024);
ret->upload_buflen = MINIMUM(limits.write_length,
SFTP_MAX_MSG_LENGTH - 1024);
ret->download_buflen = MAXIMUM(ret->download_buflen, 64);
ret->upload_buflen = MAXIMUM(ret->upload_buflen, 64);
debug3("server upload/download buffer sizes "
"%llu / %llu; using %u / %u",
(unsigned long long)limits.write_length,
(unsigned long long)limits.read_length,
ret->upload_buflen, ret->download_buflen);
}
/* Use the server limit to scale down our value only */
if (num_requests == 0 && limits.open_handles) {
ret->num_requests =
MINIMUM(DEFAULT_NUM_REQUESTS, limits.open_handles);
if (ret->num_requests == 0)
ret->num_requests = 1;
debug3("server handle limit %llu; using %u",
(unsigned long long)limits.open_handles,
ret->num_requests);
}
}
/* Some filexfer v.0 servers don't support large packets */
if (ret->version == 0) {
ret->download_buflen = MINIMUM(ret->download_buflen, 20480);
ret->upload_buflen = MINIMUM(ret->upload_buflen, 20480);
}
ret->limit_kbps = limit_kbps;
if (ret->limit_kbps > 0) {
bandwidth_limit_init(&ret->bwlimit_in, ret->limit_kbps,
ret->download_buflen);
bandwidth_limit_init(&ret->bwlimit_out, ret->limit_kbps,
ret->upload_buflen);
}
return ret;
}
u_int
sftp_proto_version(struct sftp_conn *conn)
{
return conn->version;
}
int
sftp_get_limits(struct sftp_conn *conn, struct sftp_limits *limits)
{
u_int id, msg_id;
u_char type;
struct sshbuf *msg;
int r;
if ((conn->exts & SFTP_EXT_LIMITS) == 0) {
error("Server does not support [email protected] extension");
return -1;
}
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
id = conn->msg_id++;
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_cstring(msg, "[email protected]")) != 0)
fatal_fr(r, "compose");
send_msg(conn, msg);
debug3("Sent message [email protected] I:%u", id);
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &msg_id)) != 0)
fatal_fr(r, "parse");
debug3("Received limits reply T:%u I:%u", type, msg_id);
if (id != msg_id)
fatal("ID mismatch (%u != %u)", msg_id, id);
if (type != SSH2_FXP_EXTENDED_REPLY) {
debug_f("expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
SSH2_FXP_EXTENDED_REPLY, type);
/* Disable the limits extension */
conn->exts &= ~SFTP_EXT_LIMITS;
sshbuf_free(msg);
return -1;
}
memset(limits, 0, sizeof(*limits));
if ((r = sshbuf_get_u64(msg, &limits->packet_length)) != 0 ||
(r = sshbuf_get_u64(msg, &limits->read_length)) != 0 ||
(r = sshbuf_get_u64(msg, &limits->write_length)) != 0 ||
(r = sshbuf_get_u64(msg, &limits->open_handles)) != 0)
fatal_fr(r, "parse limits");
sshbuf_free(msg);
return 0;
}
int
sftp_close(struct sftp_conn *conn, const u_char *handle, u_int handle_len)
{
u_int id, status;
struct sshbuf *msg;
int r;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
id = conn->msg_id++;
if ((r = sshbuf_put_u8(msg, SSH2_FXP_CLOSE)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_string(msg, handle, handle_len)) != 0)
fatal_fr(r, "parse");
send_msg(conn, msg);
debug3("Sent message SSH2_FXP_CLOSE I:%u", id);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("close remote: %s", fx2txt(status));
sshbuf_free(msg);
return status == SSH2_FX_OK ? 0 : -1;
}
static int
sftp_lsreaddir(struct sftp_conn *conn, const char *path, int print_flag,
SFTP_DIRENT ***dir)
{
struct sshbuf *msg;
u_int count, id, i, expected_id, ents = 0;
size_t handle_len;
u_char type, *handle;
int status = SSH2_FX_FAILURE;
int r;
if (dir)
*dir = NULL;
id = conn->msg_id++;
if ((msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_put_u8(msg, SSH2_FXP_OPENDIR)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_cstring(msg, path)) != 0)
fatal_fr(r, "compose OPENDIR");
send_msg(conn, msg);
handle = get_handle(conn, id, &handle_len,
"remote readdir(\"%s\")", path);
if (handle == NULL) {
sshbuf_free(msg);
return -1;
}
if (dir) {
ents = 0;
*dir = xcalloc(1, sizeof(**dir));
(*dir)[0] = NULL;
}
for (; !interrupted;) {
id = expected_id = conn->msg_id++;
debug3("Sending SSH2_FXP_READDIR I:%u", id);
sshbuf_reset(msg);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_READDIR)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_string(msg, handle, handle_len)) != 0)
fatal_fr(r, "compose READDIR");
send_msg(conn, msg);
sshbuf_reset(msg);
get_msg(conn, msg);
if ((r = sshbuf_get_u8(msg, &type)) != 0 ||
(r = sshbuf_get_u32(msg, &id)) != 0)
fatal_fr(r, "parse");
debug3("Received reply T:%u I:%u", type, id);
if (id != expected_id)
fatal("ID mismatch (%u != %u)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int rstatus;
if ((r = sshbuf_get_u32(msg, &rstatus)) != 0)
fatal_fr(r, "parse status");
debug3("Received SSH2_FXP_STATUS %d", rstatus);
if (rstatus == SSH2_FX_EOF)
break;
error("Couldn't read directory: %s", fx2txt(rstatus));
goto out;
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%u) packet, got %u",
SSH2_FXP_NAME, type);
if ((r = sshbuf_get_u32(msg, &count)) != 0)
fatal_fr(r, "parse count");
if (count > SSHBUF_SIZE_MAX)
fatal_f("nonsensical number of entries");
if (count == 0)
break;
debug3("Received %d SSH2_FXP_NAME responses", count);
for (i = 0; i < count; i++) {
char *filename, *longname;
Attrib a;
if ((r = sshbuf_get_cstring(msg, &filename,
NULL)) != 0 ||
(r = sshbuf_get_cstring(msg, &longname,
NULL)) != 0)
fatal_fr(r, "parse filenames");
if ((r = decode_attrib(msg, &a)) != 0) {
error_fr(r, "couldn't decode attrib");
free(filename);
free(longname);
goto out;
}
if (print_flag)
mprintf("%s\n", longname);
/*
* Directory entries should never contain '/'
* These can be used to attack recursive ops
* (e.g. send '../../../../etc/passwd')
*/
if (strpbrk(filename, SFTP_DIRECTORY_CHARS) != NULL) {
error("Server sent suspect path \"%s\" "
"during readdir of \"%s\"", filename, path);
} else if (dir) {
*dir = xreallocarray(*dir, ents + 2, sizeof(**dir));
(*dir)[ents] = xcalloc(1, sizeof(***dir));
(*dir)[ents]->filename = xstrdup(filename);
(*dir)[ents]->longname = xstrdup(longname);
memcpy(&(*dir)[ents]->a, &a, sizeof(a));
(*dir)[++ents] = NULL;
}
free(filename);
free(longname);
}
}
status = 0;
out:
sshbuf_free(msg);
sftp_close(conn, handle, handle_len);
free(handle);
if (status != 0 && dir != NULL) {
/* Don't return results on error */
sftp_free_dirents(*dir);
*dir = NULL;
} else if (interrupted && dir != NULL && *dir != NULL) {
/* Don't return partial matches on interrupt */
sftp_free_dirents(*dir);
*dir = xcalloc(1, sizeof(**dir));
**dir = NULL;
}
return status == SSH2_FX_OK ? 0 : -1;
}
int
sftp_readdir(struct sftp_conn *conn, const char *path, SFTP_DIRENT ***dir)
{
return sftp_lsreaddir(conn, path, 0, dir);
}
void sftp_free_dirents(SFTP_DIRENT **s)
{
int i;
if (s == NULL)
return;
for (i = 0; s[i]; i++) {
free(s[i]->filename);
free(s[i]->longname);
free(s[i]);
}
free(s);
}
int
sftp_rm(struct sftp_conn *conn, const char *path)
{
u_int status, id;
debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_REMOVE, path, strlen(path));
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("remote delete %s: %s", path, fx2txt(status));
return status == SSH2_FX_OK ? 0 : -1;
}
int
sftp_mkdir(struct sftp_conn *conn, const char *path, Attrib *a, int print_flag)
{
u_int status, id;
debug2("Sending SSH2_FXP_MKDIR \"%s\"", path);
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_MKDIR, path,
strlen(path), a);
status = get_status(conn, id);
if (status != SSH2_FX_OK && print_flag)
error("remote mkdir \"%s\": %s", path, fx2txt(status));
return status == SSH2_FX_OK ? 0 : -1;
}
int
sftp_rmdir(struct sftp_conn *conn, const char *path)
{
u_int status, id;
debug2("Sending SSH2_FXP_RMDIR \"%s\"", path);
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_RMDIR, path,
strlen(path));
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("remote rmdir \"%s\": %s", path, fx2txt(status));
return status == SSH2_FX_OK ? 0 : -1;
}
int
sftp_stat(struct sftp_conn *conn, const char *path, int quiet, Attrib *a)
{
u_int id;
debug2("Sending SSH2_FXP_STAT \"%s\"", path);
id = conn->msg_id++;
send_string_request(conn, id,
conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT,
path, strlen(path));
return get_decode_stat(conn, id, quiet, a);
}
int
sftp_lstat(struct sftp_conn *conn, const char *path, int quiet, Attrib *a)
{
u_int id;
if (conn->version == 0) {
do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
"Server version does not support lstat operation");
return sftp_stat(conn, path, quiet, a);
}
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_LSTAT, path,
strlen(path));
return get_decode_stat(conn, id, quiet, a);
}
#ifdef notyet
int
sftp_fstat(struct sftp_conn *conn, const u_char *handle, u_int handle_len,
int quiet, Attrib *a)
{
u_int id;
debug2("Sending SSH2_FXP_FSTAT \"%s\"");
id = conn->msg_id++;
send_string_request(conn, id, SSH2_FXP_FSTAT, handle,
handle_len);
return get_decode_stat(conn, id, quiet, a);
}
#endif
int
sftp_setstat(struct sftp_conn *conn, const char *path, Attrib *a)
{
u_int status, id;
debug2("Sending SSH2_FXP_SETSTAT \"%s\"", path);
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_SETSTAT, path,
strlen(path), a);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("remote setstat \"%s\": %s", path, fx2txt(status));
return status == SSH2_FX_OK ? 0 : -1;
}
int
sftp_fsetstat(struct sftp_conn *conn, const u_char *handle, u_int handle_len,
Attrib *a)
{
u_int status, id;
debug2("Sending SSH2_FXP_FSETSTAT");
id = conn->msg_id++;
send_string_attrs_request(conn, id, SSH2_FXP_FSETSTAT, handle,
handle_len, a);
status = get_status(conn, id);
if (status != SSH2_FX_OK)
error("remote fsetstat: %s", fx2txt(status));