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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:26:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:26:58 +0000 |
commit | 999ae6be3243c7b4a815247199447b53c39a3d65 (patch) | |
tree | 1f35b42b5e5f462d35ba452e4dcfa188ce0543fd /sftp-server.c | |
parent | Initial commit. (diff) | |
download | openssh-999ae6be3243c7b4a815247199447b53c39a3d65.tar.xz openssh-999ae6be3243c7b4a815247199447b53c39a3d65.zip |
Adding upstream version 1:7.9p1.upstream/1%7.9p1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | sftp-server.c | 1710 |
1 files changed, 1710 insertions, 0 deletions
diff --git a/sftp-server.c b/sftp-server.c new file mode 100644 index 0000000..ab1b063 --- /dev/null +++ b/sftp-server.c @@ -0,0 +1,1710 @@ +/* $OpenBSD: sftp-server.c,v 1.112 2018/06/01 03:33:53 djm Exp $ */ +/* + * Copyright (c) 2000-2004 Markus Friedl. All rights reserved. + * + * 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. + */ + +#include "includes.h" + +#include <sys/types.h> +#include <sys/stat.h> +#ifdef HAVE_SYS_TIME_H +# include <sys/time.h> +#endif +#ifdef HAVE_SYS_MOUNT_H +#include <sys/mount.h> +#endif +#ifdef HAVE_SYS_STATVFS_H +#include <sys/statvfs.h> +#endif + +#include <dirent.h> +#include <errno.h> +#include <fcntl.h> +#include <pwd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <time.h> +#include <unistd.h> +#include <stdarg.h> + +#include "xmalloc.h" +#include "sshbuf.h" +#include "ssherr.h" +#include "log.h" +#include "misc.h" +#include "match.h" +#include "uidswap.h" + +#include "sftp.h" +#include "sftp-common.h" + +/* Our verbosity */ +static LogLevel log_level = SYSLOG_LEVEL_ERROR; + +/* Our client */ +static struct passwd *pw = NULL; +static char *client_addr = NULL; + +/* input and output queue */ +struct sshbuf *iqueue; +struct sshbuf *oqueue; + +/* Version of client */ +static u_int version; + +/* SSH2_FXP_INIT received */ +static int init_done; + +/* Disable writes */ +static int readonly; + +/* Requests that are allowed/denied */ +static char *request_whitelist, *request_blacklist; + +/* portable attributes, etc. */ +typedef struct Stat Stat; + +struct Stat { + char *name; + char *long_name; + Attrib attrib; +}; + +/* Packet handlers */ +static void process_open(u_int32_t id); +static void process_close(u_int32_t id); +static void process_read(u_int32_t id); +static void process_write(u_int32_t id); +static void process_stat(u_int32_t id); +static void process_lstat(u_int32_t id); +static void process_fstat(u_int32_t id); +static void process_setstat(u_int32_t id); +static void process_fsetstat(u_int32_t id); +static void process_opendir(u_int32_t id); +static void process_readdir(u_int32_t id); +static void process_remove(u_int32_t id); +static void process_mkdir(u_int32_t id); +static void process_rmdir(u_int32_t id); +static void process_realpath(u_int32_t id); +static void process_rename(u_int32_t id); +static void process_readlink(u_int32_t id); +static void process_symlink(u_int32_t id); +static void process_extended_posix_rename(u_int32_t id); +static void process_extended_statvfs(u_int32_t id); +static void process_extended_fstatvfs(u_int32_t id); +static void process_extended_hardlink(u_int32_t id); +static void process_extended_fsync(u_int32_t id); +static void process_extended(u_int32_t id); + +struct sftp_handler { + const char *name; /* user-visible name for fine-grained perms */ + const char *ext_name; /* extended request name */ + u_int type; /* packet type, for non extended packets */ + void (*handler)(u_int32_t); + int does_write; /* if nonzero, banned for readonly mode */ +}; + +struct sftp_handler handlers[] = { + /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */ + { "open", NULL, SSH2_FXP_OPEN, process_open, 0 }, + { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 }, + { "read", NULL, SSH2_FXP_READ, process_read, 0 }, + { "write", NULL, SSH2_FXP_WRITE, process_write, 1 }, + { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 }, + { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 }, + { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 }, + { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 }, + { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 }, + { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 }, + { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 }, + { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 }, + { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 }, + { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 }, + { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 }, + { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 }, + { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 }, + { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 }, + { NULL, NULL, 0, NULL, 0 } +}; + +/* SSH2_FXP_EXTENDED submessages */ +struct sftp_handler extended_handlers[] = { + { "posix-rename", "posix-rename@openssh.com", 0, + process_extended_posix_rename, 1 }, + { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 }, + { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 }, + { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 }, + { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 }, + { NULL, NULL, 0, NULL, 0 } +}; + +static int +request_permitted(struct sftp_handler *h) +{ + char *result; + + if (readonly && h->does_write) { + verbose("Refusing %s request in read-only mode", h->name); + return 0; + } + if (request_blacklist != NULL && + ((result = match_list(h->name, request_blacklist, NULL))) != NULL) { + free(result); + verbose("Refusing blacklisted %s request", h->name); + return 0; + } + if (request_whitelist != NULL && + ((result = match_list(h->name, request_whitelist, NULL))) != NULL) { + free(result); + debug2("Permitting whitelisted %s request", h->name); + return 1; + } + if (request_whitelist != NULL) { + verbose("Refusing non-whitelisted %s request", h->name); + return 0; + } + return 1; +} + +static int +errno_to_portable(int unixerrno) +{ + int ret = 0; + + switch (unixerrno) { + case 0: + ret = SSH2_FX_OK; + break; + case ENOENT: + case ENOTDIR: + case EBADF: + case ELOOP: + ret = SSH2_FX_NO_SUCH_FILE; + break; + case EPERM: + case EACCES: + case EFAULT: + ret = SSH2_FX_PERMISSION_DENIED; + break; + case ENAMETOOLONG: + case EINVAL: + ret = SSH2_FX_BAD_MESSAGE; + break; + case ENOSYS: + ret = SSH2_FX_OP_UNSUPPORTED; + break; + default: + ret = SSH2_FX_FAILURE; + break; + } + return ret; +} + +static int +flags_from_portable(int pflags) +{ + int flags = 0; + + if ((pflags & SSH2_FXF_READ) && + (pflags & SSH2_FXF_WRITE)) { + flags = O_RDWR; + } else if (pflags & SSH2_FXF_READ) { + flags = O_RDONLY; + } else if (pflags & SSH2_FXF_WRITE) { + flags = O_WRONLY; + } + if (pflags & SSH2_FXF_APPEND) + flags |= O_APPEND; + if (pflags & SSH2_FXF_CREAT) + flags |= O_CREAT; + if (pflags & SSH2_FXF_TRUNC) + flags |= O_TRUNC; + if (pflags & SSH2_FXF_EXCL) + flags |= O_EXCL; + return flags; +} + +static const char * +string_from_portable(int pflags) +{ + static char ret[128]; + + *ret = '\0'; + +#define PAPPEND(str) { \ + if (*ret != '\0') \ + strlcat(ret, ",", sizeof(ret)); \ + strlcat(ret, str, sizeof(ret)); \ + } + + if (pflags & SSH2_FXF_READ) + PAPPEND("READ") + if (pflags & SSH2_FXF_WRITE) + PAPPEND("WRITE") + if (pflags & SSH2_FXF_APPEND) + PAPPEND("APPEND") + if (pflags & SSH2_FXF_CREAT) + PAPPEND("CREATE") + if (pflags & SSH2_FXF_TRUNC) + PAPPEND("TRUNCATE") + if (pflags & SSH2_FXF_EXCL) + PAPPEND("EXCL") + + return ret; +} + +/* handle handles */ + +typedef struct Handle Handle; +struct Handle { + int use; + DIR *dirp; + int fd; + int flags; + char *name; + u_int64_t bytes_read, bytes_write; + int next_unused; +}; + +enum { + HANDLE_UNUSED, + HANDLE_DIR, + HANDLE_FILE +}; + +Handle *handles = NULL; +u_int num_handles = 0; +int first_unused_handle = -1; + +static void handle_unused(int i) +{ + handles[i].use = HANDLE_UNUSED; + handles[i].next_unused = first_unused_handle; + first_unused_handle = i; +} + +static int +handle_new(int use, const char *name, int fd, int flags, DIR *dirp) +{ + int i; + + if (first_unused_handle == -1) { + if (num_handles + 1 <= num_handles) + return -1; + num_handles++; + handles = xreallocarray(handles, num_handles, sizeof(Handle)); + handle_unused(num_handles - 1); + } + + i = first_unused_handle; + first_unused_handle = handles[i].next_unused; + + handles[i].use = use; + handles[i].dirp = dirp; + handles[i].fd = fd; + handles[i].flags = flags; + handles[i].name = xstrdup(name); + handles[i].bytes_read = handles[i].bytes_write = 0; + + return i; +} + +static int +handle_is_ok(int i, int type) +{ + return i >= 0 && (u_int)i < num_handles && handles[i].use == type; +} + +static int +handle_to_string(int handle, u_char **stringp, int *hlenp) +{ + if (stringp == NULL || hlenp == NULL) + return -1; + *stringp = xmalloc(sizeof(int32_t)); + put_u32(*stringp, handle); + *hlenp = sizeof(int32_t); + return 0; +} + +static int +handle_from_string(const u_char *handle, u_int hlen) +{ + int val; + + if (hlen != sizeof(int32_t)) + return -1; + val = get_u32(handle); + if (handle_is_ok(val, HANDLE_FILE) || + handle_is_ok(val, HANDLE_DIR)) + return val; + return -1; +} + +static char * +handle_to_name(int handle) +{ + if (handle_is_ok(handle, HANDLE_DIR)|| + handle_is_ok(handle, HANDLE_FILE)) + return handles[handle].name; + return NULL; +} + +static DIR * +handle_to_dir(int handle) +{ + if (handle_is_ok(handle, HANDLE_DIR)) + return handles[handle].dirp; + return NULL; +} + +static int +handle_to_fd(int handle) +{ + if (handle_is_ok(handle, HANDLE_FILE)) + return handles[handle].fd; + return -1; +} + +static int +handle_to_flags(int handle) +{ + if (handle_is_ok(handle, HANDLE_FILE)) + return handles[handle].flags; + return 0; +} + +static void +handle_update_read(int handle, ssize_t bytes) +{ + if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0) + handles[handle].bytes_read += bytes; +} + +static void +handle_update_write(int handle, ssize_t bytes) +{ + if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0) + handles[handle].bytes_write += bytes; +} + +static u_int64_t +handle_bytes_read(int handle) +{ + if (handle_is_ok(handle, HANDLE_FILE)) + return (handles[handle].bytes_read); + return 0; +} + +static u_int64_t +handle_bytes_write(int handle) +{ + if (handle_is_ok(handle, HANDLE_FILE)) + return (handles[handle].bytes_write); + return 0; +} + +static int +handle_close(int handle) +{ + int ret = -1; + + if (handle_is_ok(handle, HANDLE_FILE)) { + ret = close(handles[handle].fd); + free(handles[handle].name); + handle_unused(handle); + } else if (handle_is_ok(handle, HANDLE_DIR)) { + ret = closedir(handles[handle].dirp); + free(handles[handle].name); + handle_unused(handle); + } else { + errno = ENOENT; + } + return ret; +} + +static void +handle_log_close(int handle, char *emsg) +{ + if (handle_is_ok(handle, HANDLE_FILE)) { + logit("%s%sclose \"%s\" bytes read %llu written %llu", + emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ", + handle_to_name(handle), + (unsigned long long)handle_bytes_read(handle), + (unsigned long long)handle_bytes_write(handle)); + } else { + logit("%s%sclosedir \"%s\"", + emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ", + handle_to_name(handle)); + } +} + +static void +handle_log_exit(void) +{ + u_int i; + + for (i = 0; i < num_handles; i++) + if (handles[i].use != HANDLE_UNUSED) + handle_log_close(i, "forced"); +} + +static int +get_handle(struct sshbuf *queue, int *hp) +{ + u_char *handle; + int r; + size_t hlen; + + *hp = -1; + if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0) + return r; + if (hlen < 256) + *hp = handle_from_string(handle, hlen); + free(handle); + return 0; +} + +/* send replies */ + +static void +send_msg(struct sshbuf *m) +{ + int r; + + if ((r = sshbuf_put_stringb(oqueue, m)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + sshbuf_reset(m); +} + +static const char * +status_to_message(u_int32_t status) +{ + const char *status_messages[] = { + "Success", /* SSH_FX_OK */ + "End of file", /* SSH_FX_EOF */ + "No such file", /* SSH_FX_NO_SUCH_FILE */ + "Permission denied", /* SSH_FX_PERMISSION_DENIED */ + "Failure", /* SSH_FX_FAILURE */ + "Bad message", /* SSH_FX_BAD_MESSAGE */ + "No connection", /* SSH_FX_NO_CONNECTION */ + "Connection lost", /* SSH_FX_CONNECTION_LOST */ + "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */ + "Unknown error" /* Others */ + }; + return (status_messages[MINIMUM(status,SSH2_FX_MAX)]); +} + +static void +send_status(u_int32_t id, u_int32_t status) +{ + 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)); + 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) { + 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); + sshbuf_free(msg); +} +static void +send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen) +{ + 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 u_char *data, int dlen) +{ + debug("request %u: sent data len %d", id, dlen); + send_data_or_handle(SSH2_FXP_DATA, id, data, dlen); +} + +static void +send_handle(u_int32_t id, int handle) +{ + u_char *string; + int hlen; + + handle_to_string(handle, &string, &hlen); + debug("request %u: sent handle handle %d", id, handle); + send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen); + free(string); +} + +static void +send_names(u_int32_t id, int count, const Stat *stats) +{ + 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++) { + 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); + sshbuf_free(msg); +} + +static void +send_attrib(u_int32_t id, const Attrib *a) +{ + struct sshbuf *msg; + int r; + + debug("request %u: sent attrib have 0x%x", id, a->flags); + 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) +{ + 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; + + 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 */ + +static void +process_init(void) +{ + struct sshbuf *msg; + int r; + + if ((r = sshbuf_get_u32(iqueue, &version)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + verbose("received client version %u", version); + 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; + char *name; + 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)); + + debug3("request %u: open flags %d", id, pflags); + flags = flags_from_portable(pflags); + 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_RDONLY || + (flags & (O_CREAT|O_TRUNC)) != 0)) { + verbose("Refusing open request in read-only mode"); + status = SSH2_FX_PERMISSION_DENIED; + } else { + fd = open(name, flags, mode); + if (fd < 0) { + status = errno_to_portable(errno); + } else { + handle = handle_new(HANDLE_FILE, name, fd, flags, NULL); + if (handle < 0) { + close(fd); + } else { + send_handle(id, handle); + status = SSH2_FX_OK; + } + } + } + if (status != SSH2_FX_OK) + send_status(id, status); + free(name); +} + +static void +process_close(u_int32_t id) +{ + int r, handle, ret, status = SSH2_FX_FAILURE; + + if ((r = get_handle(iqueue, &handle)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + debug3("request %u: close handle %u", id, handle); + handle_log_close(handle, NULL); + ret = handle_close(handle); + status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); +} + +static void +process_read(u_int32_t id) +{ + u_char buf[64*1024]; + u_int32_t len; + int r, handle, fd, ret, status = SSH2_FX_FAILURE; + u_int64_t off; + + 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); + if (len > sizeof buf) { + len = sizeof buf; + debug2("read change len %d", len); + } + fd = handle_to_fd(handle); + if (fd >= 0) { + if (lseek(fd, off, SEEK_SET) < 0) { + error("process_read: seek failed"); + status = errno_to_portable(errno); + } else { + ret = read(fd, buf, len); + if (ret < 0) { + status = errno_to_portable(errno); + } else if (ret == 0) { + status = SSH2_FX_EOF; + } else { + send_data(id, buf, ret); + status = SSH2_FX_OK; + handle_update_read(handle, ret); + } + } + } + if (status != SSH2_FX_OK) + send_status(id, status); +} + +static void +process_write(u_int32_t id) +{ + u_int64_t off; + size_t len; + int r, handle, fd, ret, status; + u_char *data; + + 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 %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 { + if (!(handle_to_flags(handle) & O_APPEND) && + lseek(fd, off, SEEK_SET) < 0) { + status = errno_to_portable(errno); + error("process_write: seek failed"); + } else { +/* XXX ATOMICIO ? */ + ret = write(fd, data, len); + if (ret < 0) { + error("process_write: write failed"); + status = errno_to_portable(errno); + } else if ((size_t)ret == len) { + status = SSH2_FX_OK; + handle_update_write(handle, ret); + } else { + debug2("nothing at all written"); + status = SSH2_FX_FAILURE; + } + } + } + send_status(id, status); + free(data); +} + +static void +process_do_stat(u_int32_t id, int do_lstat) +{ + Attrib a; + struct stat st; + char *name; + int r, status = SSH2_FX_FAILURE; + + if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + debug3("request %u: %sstat", id, do_lstat ? "l" : ""); + verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name); + r = do_lstat ? lstat(name, &st) : stat(name, &st); + if (r < 0) { + status = errno_to_portable(errno); + } else { + stat_to_attrib(&st, &a); + send_attrib(id, &a); + status = SSH2_FX_OK; + } + if (status != SSH2_FX_OK) + send_status(id, status); + free(name); +} + +static void +process_stat(u_int32_t id) +{ + process_do_stat(id, 0); +} + +static void +process_lstat(u_int32_t id) +{ + process_do_stat(id, 1); +} + +static void +process_fstat(u_int32_t id) +{ + Attrib a; + struct stat st; + int fd, r, handle, status = SSH2_FX_FAILURE; + + 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) { + r = fstat(fd, &st); + if (r < 0) { + status = errno_to_portable(errno); + } else { + stat_to_attrib(&st, &a); + send_attrib(id, &a); + status = SSH2_FX_OK; + } + } + if (status != SSH2_FX_OK) + send_status(id, status); +} + +static struct timeval * +attrib_to_tv(const Attrib *a) +{ + static struct timeval tv[2]; + + tv[0].tv_sec = a->atime; + tv[0].tv_usec = 0; + tv[1].tv_sec = a->mtime; + tv[1].tv_usec = 0; + return tv; +} + +static void +process_setstat(u_int32_t id) +{ + Attrib a; + char *name; + 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)); + + debug("request %u: setstat name \"%s\"", id, name); + if (a.flags & SSH2_FILEXFER_ATTR_SIZE) { + logit("set \"%s\" size %llu", + 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); + r = chmod(name, a.perm & 07777); + if (r == -1) + status = errno_to_portable(errno); + } + if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) { + char buf[64]; + time_t t = a.mtime; + + strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S", + localtime(&t)); + logit("set \"%s\" modtime %s", name, buf); + r = utimes(name, attrib_to_tv(&a)); + if (r == -1) + status = errno_to_portable(errno); + } + if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) { + logit("set \"%s\" owner %lu group %lu", name, + (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); + free(name); +} + +static void +process_fsetstat(u_int32_t id) +{ + Attrib a; + int handle, fd, r; + int status = SSH2_FX_OK; + + 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) + status = SSH2_FX_FAILURE; + else { + char *name = handle_to_name(handle); + + if (a.flags & SSH2_FILEXFER_ATTR_SIZE) { + logit("set \"%s\" size %llu", + 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); +#ifdef HAVE_FCHMOD + r = fchmod(fd, a.perm & 07777); +#else + r = chmod(name, a.perm & 07777); +#endif + if (r == -1) + status = errno_to_portable(errno); + } + if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) { + char buf[64]; + 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 + r = futimes(fd, attrib_to_tv(&a)); +#else + r = utimes(name, attrib_to_tv(&a)); +#endif + if (r == -1) + status = errno_to_portable(errno); + } + if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) { + logit("set \"%s\" owner %lu group %lu", name, + (u_long)a.uid, (u_long)a.gid); +#ifdef HAVE_FCHOWN + r = fchown(fd, a.uid, a.gid); +#else + r = chown(name, a.uid, a.gid); +#endif + if (r == -1) + status = errno_to_portable(errno); + } + } + send_status(id, status); +} + +static void +process_opendir(u_int32_t id) +{ + DIR *dirp = NULL; + char *path; + 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)); + + debug3("request %u: opendir", id); + logit("opendir \"%s\"", path); + dirp = opendir(path); + if (dirp == NULL) { + status = errno_to_portable(errno); + } else { + handle = handle_new(HANDLE_DIR, path, 0, 0, dirp); + if (handle < 0) { + closedir(dirp); + } else { + send_handle(id, handle); + status = SSH2_FX_OK; + } + + } + if (status != SSH2_FX_OK) + send_status(id, status); + free(path); +} + +static void +process_readdir(u_int32_t id) +{ + DIR *dirp; + struct dirent *dp; + char *path; + int r, handle; + + if ((r = get_handle(iqueue, &handle)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + debug("request %u: readdir \"%s\" (handle %d)", id, + handle_to_name(handle), handle); + dirp = handle_to_dir(handle); + path = handle_to_name(handle); + if (dirp == NULL || path == NULL) { + send_status(id, SSH2_FX_FAILURE); + } else { + struct stat st; + char pathname[PATH_MAX]; + Stat *stats; + int nstats = 10, count = 0, i; + + stats = xcalloc(nstats, sizeof(Stat)); + while ((dp = readdir(dirp)) != NULL) { + if (count >= nstats) { + nstats *= 2; + stats = xreallocarray(stats, nstats, sizeof(Stat)); + } +/* XXX OVERFLOW ? */ + snprintf(pathname, sizeof pathname, "%s%s%s", path, + strcmp(path, "/") ? "/" : "", dp->d_name); + if (lstat(pathname, &st) < 0) + continue; + stat_to_attrib(&st, &(stats[count].attrib)); + stats[count].name = xstrdup(dp->d_name); + stats[count].long_name = ls_file(dp->d_name, &st, 0, 0); + count++; + /* send up to 100 entries in one message */ + /* XXX check packet size instead */ + if (count == 100) + break; + } + if (count > 0) { + send_names(id, count, stats); + for (i = 0; i < count; i++) { + free(stats[i].name); + free(stats[i].long_name); + } + } else { + send_status(id, SSH2_FX_EOF); + } + free(stats); + } +} + +static void +process_remove(u_int32_t id) +{ + char *name; + int r, status = SSH2_FX_FAILURE; + + if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + debug3("request %u: remove", id); + logit("remove name \"%s\"", name); + r = unlink(name); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(name); +} + +static void +process_mkdir(u_int32_t id) +{ + Attrib a; + char *name; + int r, mode, status = SSH2_FX_FAILURE; + + 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); + r = mkdir(name, mode); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(name); +} + +static void +process_rmdir(u_int32_t id) +{ + char *name; + int r, status; + + if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + debug3("request %u: rmdir", id); + logit("rmdir name \"%s\"", name); + r = rmdir(name); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(name); +} + +static void +process_realpath(u_int32_t id) +{ + 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)); + + if (path[0] == '\0') { + free(path); + path = xstrdup("."); + } + debug3("request %u: realpath", id); + verbose("realpath \"%s\"", path); + if (realpath(path, resolvedname) == NULL) { + send_status(id, errno_to_portable(errno)); + } else { + Stat s; + attrib_clear(&s.attrib); + s.name = s.long_name = resolvedname; + send_names(id, 1, &s); + } + free(path); +} + +static void +process_rename(u_int32_t id) +{ + char *oldpath, *newpath; + int r, status; + struct stat sb; + + 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; + if (lstat(oldpath, &sb) == -1) + status = errno_to_portable(errno); + else if (S_ISREG(sb.st_mode)) { + /* Race-free rename of regular files */ + if (link(oldpath, newpath) == -1) { + if (errno == EOPNOTSUPP || errno == ENOSYS +#ifdef EXDEV + || errno == EXDEV +#endif +#ifdef LINK_OPNOTSUPP_ERRNO + || errno == LINK_OPNOTSUPP_ERRNO +#endif + ) { + struct stat st; + + /* + * fs doesn't support links, so fall back to + * stat+rename. This is racy. + */ + if (stat(newpath, &st) == -1) { + if (rename(oldpath, newpath) == -1) + status = + errno_to_portable(errno); + else + status = SSH2_FX_OK; + } + } else { + status = errno_to_portable(errno); + } + } else if (unlink(oldpath) == -1) { + status = errno_to_portable(errno); + /* clean spare link */ + unlink(newpath); + } else + status = SSH2_FX_OK; + } else if (stat(newpath, &sb) == -1) { + if (rename(oldpath, newpath) == -1) + status = errno_to_portable(errno); + else + status = SSH2_FX_OK; + } + send_status(id, status); + free(oldpath); + free(newpath); +} + +static void +process_readlink(u_int32_t id) +{ + int r, len; + char buf[PATH_MAX]; + char *path; + + 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) + send_status(id, errno_to_portable(errno)); + else { + Stat s; + + buf[len] = '\0'; + attrib_clear(&s.attrib); + s.name = s.long_name = buf; + send_names(id, 1, &s); + } + free(path); +} + +static void +process_symlink(u_int32_t id) +{ + char *oldpath, *newpath; + 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)); + + debug3("request %u: symlink", id); + logit("symlink old \"%s\" new \"%s\"", oldpath, newpath); + /* this will fail if 'newpath' exists */ + r = symlink(oldpath, newpath); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(oldpath); + free(newpath); +} + +static void +process_extended_posix_rename(u_int32_t id) +{ + char *oldpath, *newpath; + 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)); + + debug3("request %u: posix-rename", id); + logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath); + r = rename(oldpath, newpath); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(oldpath); + free(newpath); +} + +static void +process_extended_statvfs(u_int32_t id) +{ + char *path; + struct statvfs st; + int r; + + 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); + + if (statvfs(path, &st) != 0) + send_status(id, errno_to_portable(errno)); + else + send_statvfs(id, &st); + free(path); +} + +static void +process_extended_fstatvfs(u_int32_t id) +{ + int r, handle, fd; + struct statvfs st; + + 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) { + send_status(id, SSH2_FX_FAILURE); + return; + } + if (fstatvfs(fd, &st) != 0) + send_status(id, errno_to_portable(errno)); + else + send_statvfs(id, &st); +} + +static void +process_extended_hardlink(u_int32_t id) +{ + char *oldpath, *newpath; + 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)); + + debug3("request %u: hardlink", id); + logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath); + r = link(oldpath, newpath); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + send_status(id, status); + free(oldpath); + free(newpath); +} + +static void +process_extended_fsync(u_int32_t id) +{ + int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED; + + 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)) { + r = fsync(fd); + status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK; + } + send_status(id, status); +} + +static void +process_extended(u_int32_t id) +{ + char *request; + int i, r; + + 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])) + send_status(id, SSH2_FX_PERMISSION_DENIED); + else + extended_handlers[i].handler(id); + break; + } + } + if (extended_handlers[i].handler == NULL) { + error("Unknown extended request \"%.100s\"", request); + send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */ + } + free(request); +} + +/* stolen from ssh-agent */ + +static void +process(void) +{ + 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 = sshbuf_len(iqueue); + if (buf_len < 5) + return; /* Incomplete message. */ + cp = sshbuf_ptr(iqueue); + msg_len = get_u32(cp); + if (msg_len > SFTP_MAX_MSG_LENGTH) { + error("bad message from %s local user %s", + client_addr, pw->pw_name); + sftp_server_cleanup_exit(11); + } + if (buf_len < msg_len + 4) + return; + if ((r = sshbuf_consume(iqueue, 4)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + buf_len -= 4; + if ((r = sshbuf_get_u8(iqueue, &type)) != 0) + fatal("%s: buffer error: %s", __func__, ssh_err(r)); + + switch (type) { + case SSH2_FXP_INIT: + process_init(); + init_done = 1; + break; + case SSH2_FXP_EXTENDED: + if (!init_done) + fatal("Received extended request before init"); + 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); + 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])) { + send_status(id, + SSH2_FX_PERMISSION_DENIED); + } else { + handlers[i].handler(id); + } + break; + } + } + if (handlers[i].handler == NULL) + error("Unknown message %u", type); + } + /* discard the remaining bytes from the current packet */ + if (buf_len < sshbuf_len(iqueue)) { + error("iqueue grew unexpectedly"); + sftp_server_cleanup_exit(255); + } + 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 && + (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 */ +void +sftp_server_cleanup_exit(int i) +{ + if (pw != NULL && client_addr != NULL) { + handle_log_exit(); + logit("session closed for local user %s from [%s]", + pw->pw_name, client_addr); + } + _exit(i); +} + +static void +sftp_server_usage(void) +{ + extern char *__progname; + + fprintf(stderr, + "usage: %s [-ehR] [-d start_directory] [-f log_facility] " + "[-l log_level]\n\t[-P blacklisted_requests] " + "[-p whitelisted_requests] [-u umask]\n" + " %s -Q protocol_feature\n", + __progname, __progname); + exit(1); +} + +int +sftp_server_main(int argc, char **argv, struct passwd *user_pw) +{ + fd_set *rset, *wset; + 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, uidstr[32], buf[4*4096]; + long mask; + + extern char *optarg; + extern char *__progname; + + ssh_malloc_init(); /* must be called before any mallocs */ + __progname = ssh_get_progname(argv[0]); + log_init(__progname, log_level, log_facility, log_stderr); + + pw = pwcopy(user_pw); + + while (!skipargs && (ch = getopt(argc, argv, + "d:f:l:P:p:Q:u:cehR")) != -1) { + switch (ch) { + case 'Q': + if (strcasecmp(optarg, "requests") != 0) { + fprintf(stderr, "Invalid query type\n"); + exit(1); + } + for (i = 0; handlers[i].handler != NULL; i++) + printf("%s\n", handlers[i].name); + for (i = 0; extended_handlers[i].handler != NULL; i++) + printf("%s\n", extended_handlers[i].name); + exit(0); + break; + case 'R': + readonly = 1; + break; + case 'c': + /* + * Ignore all arguments if we are invoked as a + * shell using "sftp-server -c command" + */ + skipargs = 1; + break; + case 'e': + log_stderr = 1; + break; + case 'l': + log_level = log_level_number(optarg); + if (log_level == SYSLOG_LEVEL_NOT_SET) + error("Invalid log level \"%s\"", optarg); + break; + case 'f': + log_facility = log_facility_number(optarg); + if (log_facility == SYSLOG_FACILITY_NOT_SET) + error("Invalid log facility \"%s\"", optarg); + break; + case 'd': + cp = tilde_expand_filename(optarg, user_pw->pw_uid); + snprintf(uidstr, sizeof(uidstr), "%llu", + (unsigned long long)pw->pw_uid); + homedir = percent_expand(cp, "d", user_pw->pw_dir, + "u", user_pw->pw_name, "U", uidstr, (char *)NULL); + free(cp); + break; + case 'p': + if (request_whitelist != NULL) + fatal("Permitted requests already set"); + request_whitelist = xstrdup(optarg); + break; + case 'P': + if (request_blacklist != NULL) + fatal("Refused requests already set"); + request_blacklist = xstrdup(optarg); + break; + case 'u': + errno = 0; + mask = strtol(optarg, &cp, 8); + if (mask < 0 || mask > 0777 || *cp != '\0' || + cp == optarg || (mask == 0 && errno != 0)) + fatal("Invalid umask \"%s\"", optarg); + (void)umask((mode_t)mask); + break; + case 'h': + default: + sftp_server_usage(); + } + } + + log_init(__progname, log_level, log_facility, log_stderr); + + /* + * On platforms where we can, 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. + */ + platform_disable_tracing(1); /* strict */ + + /* Drop any fine-grained privileges we don't need */ + platform_pledge_sftp_server(); + + if ((cp = getenv("SSH_CONNECTION")) != NULL) { + client_addr = xstrdup(cp); + if ((cp = strchr(client_addr, ' ')) == NULL) { + error("Malformed SSH_CONNECTION variable: \"%s\"", + getenv("SSH_CONNECTION")); + sftp_server_cleanup_exit(255); + } + *cp = '\0'; + } else + client_addr = xstrdup("UNKNOWN"); + + logit("session opened for local user %s from [%s]", + pw->pw_name, client_addr); + + in = STDIN_FILENO; + out = STDOUT_FILENO; + +#ifdef HAVE_CYGWIN + setmode(in, O_BINARY); + setmode(out, O_BINARY); +#endif + + max = 0; + if (in > max) + max = in; + if (out > max) + max = out; + + if ((iqueue = sshbuf_new()) == NULL) + fatal("%s: sshbuf_new failed", __func__); + if ((oqueue = sshbuf_new()) == NULL) + fatal("%s: sshbuf_new failed", __func__); + + rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask)); + wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask)); + + if (homedir != NULL) { + if (chdir(homedir) != 0) { + error("chdir to \"%s\" failed: %s", homedir, + strerror(errno)); + } + } + + set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); + for (;;) { + memset(rset, 0, set_size); + memset(wset, 0, set_size); + + /* + * Ensure that we can read a full buffer and handle + * the worst-case length packet it can generate, + * otherwise apply backpressure by stopping reads. + */ + 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 = sshbuf_len(oqueue); + if (olen > 0) + FD_SET(out, wset); + + if (select(max+1, rset, wset, NULL, NULL) < 0) { + if (errno == EINTR) + continue; + error("select: %s", strerror(errno)); + sftp_server_cleanup_exit(2); + } + + /* copy stdin to iqueue */ + if (FD_ISSET(in, rset)) { + len = read(in, buf, sizeof buf); + if (len == 0) { + debug("read eof"); + sftp_server_cleanup_exit(0); + } else if (len < 0) { + error("read: %s", strerror(errno)); + sftp_server_cleanup_exit(1); + } 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, sshbuf_ptr(oqueue), olen); + if (len < 0) { + error("write: %s", strerror(errno)); + sftp_server_cleanup_exit(1); + } else if ((r = sshbuf_consume(oqueue, len)) != 0) { + fatal("%s: buffer error: %s", + __func__, ssh_err(r)); + } + } + + /* + * Process requests from client if we can fit the results + * into the output buffer, otherwise stop processing input + * and let the output queue drain. + */ + 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)); + } +} |