diff options
Diffstat (limited to 'crypto/openssh/sftp-server.c')
| -rw-r--r-- | crypto/openssh/sftp-server.c | 1337 |
1 files changed, 0 insertions, 1337 deletions
diff --git a/crypto/openssh/sftp-server.c b/crypto/openssh/sftp-server.c deleted file mode 100644 index c57958b..0000000 --- a/crypto/openssh/sftp-server.c +++ /dev/null @@ -1,1337 +0,0 @@ -/* $OpenBSD: sftp-server.c,v 1.70 2006/08/03 03:34:42 deraadt 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/param.h> -#include <sys/stat.h> -#ifdef HAVE_SYS_TIME_H -# include <sys/time.h> -#endif - -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <pwd.h> -#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 "log.h" -#include "misc.h" -#include "uidswap.h" - -#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 */ -LogLevel log_level = SYSLOG_LEVEL_ERROR; - -/* Our client */ -struct passwd *pw = NULL; -char *client_addr = NULL; - -/* input and output queue */ -Buffer iqueue; -Buffer oqueue; - -/* Version of client */ -int version; - -/* portable attributes, etc. */ - -typedef struct Stat Stat; - -struct Stat { - char *name; - char *long_name; - Attrib attrib; -}; - -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; - 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_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_CREAT) - PAPPEND("CREATE") - if (pflags & SSH2_FXF_TRUNC) - PAPPEND("TRUNCATE") - if (pflags & SSH2_FXF_EXCL) - PAPPEND("EXCL") - - return ret; -} - -static Attrib * -get_attrib(void) -{ - return decode_attrib(&iqueue); -} - -/* handle handles */ - -typedef struct Handle Handle; -struct Handle { - int use; - DIR *dirp; - int fd; - char *name; - u_int64_t bytes_read, bytes_write; -}; - -enum { - HANDLE_UNUSED, - HANDLE_DIR, - HANDLE_FILE -}; - -Handle handles[100]; - -static void -handle_init(void) -{ - u_int i; - - for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) - handles[i].use = HANDLE_UNUSED; -} - -static int -handle_new(int use, const char *name, int fd, DIR *dirp) -{ - u_int i; - - for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) { - if (handles[i].use == HANDLE_UNUSED) { - handles[i].use = use; - handles[i].dirp = dirp; - handles[i].fd = fd; - handles[i].name = xstrdup(name); - handles[i].bytes_read = handles[i].bytes_write = 0; - return i; - } - } - return -1; -} - -static int -handle_is_ok(int i, int type) -{ - return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) && - handles[i].use == type; -} - -static int -handle_to_string(int handle, 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 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 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); - handles[handle].use = HANDLE_UNUSED; - xfree(handles[handle].name); - } else if (handle_is_ok(handle, HANDLE_DIR)) { - ret = closedir(handles[handle].dirp); - handles[handle].use = HANDLE_UNUSED; - xfree(handles[handle].name); - } 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), - handle_bytes_read(handle), 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 < sizeof(handles)/sizeof(Handle); i++) - if (handles[i].use != HANDLE_UNUSED) - handle_log_close(i, "forced"); -} - -static int -get_handle(void) -{ - char *handle; - int val = -1; - u_int hlen; - - handle = get_string(&hlen); - if (hlen < 256) - val = handle_from_string(handle, hlen); - xfree(handle); - return val; -} - -/* send replies */ - -static void -send_msg(Buffer *m) -{ - int mlen = buffer_len(m); - - buffer_put_int(&oqueue, mlen); - buffer_append(&oqueue, buffer_ptr(m), mlen); - buffer_consume(m, mlen); -} - -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[MIN(status,SSH2_FX_MAX)]); -} - -static void -send_status(u_int32_t id, u_int32_t status) -{ - Buffer msg; - - 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 (version >= 3) { - buffer_put_cstring(&msg, status_to_message(status)); - buffer_put_cstring(&msg, ""); - } - send_msg(&msg); - buffer_free(&msg); -} -static void -send_data_or_handle(char type, u_int32_t id, const 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); -} - -static void -send_data(u_int32_t id, const 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) -{ - 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); - xfree(string); -} - -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); - 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); - } - send_msg(&msg); - buffer_free(&msg); -} - -static void -send_attrib(u_int32_t id, const Attrib *a) -{ - Buffer msg; - - 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); -} - -/* parse incoming */ - -static void -process_init(void) -{ - Buffer msg; - - version = get_int(); - verbose("received client version %d", version); - buffer_init(&msg); - buffer_put_char(&msg, SSH2_FXP_VERSION); - buffer_put_int(&msg, SSH2_FILEXFER_VERSION); - send_msg(&msg); - buffer_free(&msg); -} - -static void -process_open(void) -{ - u_int32_t id, pflags; - Attrib *a; - char *name; - int handle, fd, flags, mode, status = SSH2_FX_FAILURE; - - id = get_int(); - 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; - logit("open \"%s\" flags %s mode 0%o", - name, string_from_portable(pflags), mode); - fd = open(name, flags, mode); - if (fd < 0) { - status = errno_to_portable(errno); - } else { - handle = handle_new(HANDLE_FILE, name, fd, NULL); - if (handle < 0) { - close(fd); - } else { - send_handle(id, handle); - status = SSH2_FX_OK; - } - } - if (status != SSH2_FX_OK) - send_status(id, status); - xfree(name); -} - -static void -process_close(void) -{ - u_int32_t id; - int handle, ret, status = SSH2_FX_FAILURE; - - id = get_int(); - handle = get_handle(); - 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(void) -{ - char buf[64*1024]; - u_int32_t id, len; - int handle, fd, ret, status = SSH2_FX_FAILURE; - u_int64_t off; - - id = get_int(); - handle = get_handle(); - off = get_int64(); - len = get_int(); - - 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(void) -{ - u_int32_t id; - u_int64_t off; - u_int len; - int handle, fd, ret, status = SSH2_FX_FAILURE; - char *data; - - id = get_int(); - handle = get_handle(); - off = get_int64(); - data = get_string(&len); - - debug("request %u: write \"%s\" (handle %d) off %llu len %d", - id, handle_to_name(handle), handle, (unsigned long long)off, len); - fd = handle_to_fd(handle); - if (fd >= 0) { - if (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"); - } - } - } - send_status(id, status); - xfree(data); -} - -static void -process_do_stat(int do_lstat) -{ - Attrib a; - struct stat st; - u_int32_t id; - char *name; - int ret, status = SSH2_FX_FAILURE; - - id = get_int(); - 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) { - 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); - xfree(name); -} - -static void -process_stat(void) -{ - process_do_stat(0); -} - -static void -process_lstat(void) -{ - process_do_stat(1); -} - -static void -process_fstat(void) -{ - Attrib a; - struct stat st; - u_int32_t id; - int fd, ret, handle, status = SSH2_FX_FAILURE; - - id = get_int(); - handle = get_handle(); - 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) { - 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(void) -{ - Attrib *a; - u_int32_t id; - char *name; - int status = SSH2_FX_OK, ret; - - id = get_int(); - name = get_string(NULL); - a = get_attrib(); - debug("request %u: setstat name \"%s\"", id, name); - if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { - logit("set \"%s\" size %llu", name, a->size); - ret = truncate(name, a->size); - if (ret == -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 & 0777); - if (ret == -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); - ret = utimes(name, attrib_to_tv(a)); - if (ret == -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); - ret = chown(name, a->uid, a->gid); - if (ret == -1) - status = errno_to_portable(errno); - } - send_status(id, status); - xfree(name); -} - -static void -process_fsetstat(void) -{ - Attrib *a; - u_int32_t id; - int handle, fd, ret; - int status = SSH2_FX_OK; - - id = get_int(); - handle = get_handle(); - a = get_attrib(); - 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, a->size); - ret = ftruncate(fd, a->size); - if (ret == -1) - status = errno_to_portable(errno); - } - if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { - logit("set \"%s\" mode %04o", name, a->perm); -#ifdef HAVE_FCHMOD - ret = fchmod(fd, a->perm & 0777); -#else - ret = chmod(name, a->perm & 0777); -#endif - if (ret == -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 - ret = futimes(fd, attrib_to_tv(a)); -#else - ret = utimes(name, attrib_to_tv(a)); -#endif - if (ret == -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 - ret = fchown(fd, a->uid, a->gid); -#else - ret = chown(name, a->uid, a->gid); -#endif - if (ret == -1) - status = errno_to_portable(errno); - } - } - send_status(id, status); -} - -static void -process_opendir(void) -{ - DIR *dirp = NULL; - char *path; - int handle, status = SSH2_FX_FAILURE; - u_int32_t id; - - id = get_int(); - path = get_string(NULL); - 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, dirp); - if (handle < 0) { - closedir(dirp); - } else { - send_handle(id, handle); - status = SSH2_FX_OK; - } - - } - if (status != SSH2_FX_OK) - send_status(id, status); - xfree(path); -} - -static void -process_readdir(void) -{ - DIR *dirp; - struct dirent *dp; - char *path; - int handle; - u_int32_t id; - - id = get_int(); - handle = get_handle(); - 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[MAXPATHLEN]; - Stat *stats; - int nstats = 10, count = 0, i; - - stats = xcalloc(nstats, sizeof(Stat)); - while ((dp = readdir(dirp)) != NULL) { - if (count >= nstats) { - nstats *= 2; - stats = xrealloc(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); - 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++) { - xfree(stats[i].name); - xfree(stats[i].long_name); - } - } else { - send_status(id, SSH2_FX_EOF); - } - xfree(stats); - } -} - -static void -process_remove(void) -{ - char *name; - u_int32_t id; - int status = SSH2_FX_FAILURE; - int ret; - - id = get_int(); - 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; - send_status(id, status); - xfree(name); -} - -static void -process_mkdir(void) -{ - Attrib *a; - u_int32_t id; - char *name; - int ret, mode, status = SSH2_FX_FAILURE; - - id = get_int(); - name = get_string(NULL); - a = get_attrib(); - mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? - a->perm & 0777 : 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; - send_status(id, status); - xfree(name); -} - -static void -process_rmdir(void) -{ - u_int32_t id; - char *name; - int ret, status; - - id = get_int(); - 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; - send_status(id, status); - xfree(name); -} - -static void -process_realpath(void) -{ - char resolvedname[MAXPATHLEN]; - u_int32_t id; - char *path; - - id = get_int(); - path = get_string(NULL); - if (path[0] == '\0') { - xfree(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); - } - xfree(path); -} - -static void -process_rename(void) -{ - u_int32_t id; - char *oldpath, *newpath; - int status; - struct stat sb; - - id = get_int(); - oldpath = get_string(NULL); - newpath = get_string(NULL); - 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 -#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); - xfree(oldpath); - xfree(newpath); -} - -static void -process_readlink(void) -{ - u_int32_t id; - int len; - char buf[MAXPATHLEN]; - char *path; - - id = get_int(); - path = get_string(NULL); - 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); - } - xfree(path); -} - -static void -process_symlink(void) -{ - u_int32_t id; - char *oldpath, *newpath; - int ret, status; - - id = get_int(); - 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; - send_status(id, status); - xfree(oldpath); - xfree(newpath); -} - -static void -process_extended(void) -{ - u_int32_t id; - char *request; - - id = get_int(); - request = get_string(NULL); - send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */ - xfree(request); -} - -/* stolen from ssh-agent */ - -static void -process(void) -{ - u_int msg_len; - u_int buf_len; - u_int consumed; - u_int type; - u_char *cp; - - buf_len = buffer_len(&iqueue); - if (buf_len < 5) - return; /* Incomplete message. */ - cp = buffer_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); - cleanup_exit(11); - } - if (buf_len < msg_len + 4) - return; - buffer_consume(&iqueue, 4); - buf_len -= 4; - type = buffer_get_char(&iqueue); - switch (type) { - case SSH2_FXP_INIT: - process_init(); - break; - case SSH2_FXP_OPEN: - process_open(); - break; - case SSH2_FXP_CLOSE: - process_close(); - break; - case SSH2_FXP_READ: - process_read(); - break; - case SSH2_FXP_WRITE: - process_write(); - break; - case SSH2_FXP_LSTAT: - process_lstat(); - break; - case SSH2_FXP_FSTAT: - process_fstat(); - break; - case SSH2_FXP_SETSTAT: - process_setstat(); - break; - case SSH2_FXP_FSETSTAT: - process_fsetstat(); - break; - case SSH2_FXP_OPENDIR: - process_opendir(); - break; - case SSH2_FXP_READDIR: - process_readdir(); - break; - case SSH2_FXP_REMOVE: - process_remove(); - break; - case SSH2_FXP_MKDIR: - process_mkdir(); - break; - case SSH2_FXP_RMDIR: - process_rmdir(); - break; - case SSH2_FXP_REALPATH: - process_realpath(); - break; - case SSH2_FXP_STAT: - process_stat(); - break; - case SSH2_FXP_RENAME: - process_rename(); - break; - case SSH2_FXP_READLINK: - process_readlink(); - break; - case SSH2_FXP_SYMLINK: - process_symlink(); - break; - case SSH2_FXP_EXTENDED: - process_extended(); - break; - default: - error("Unknown message %d", type); - break; - } - /* discard the remaining bytes from the current packet */ - if (buf_len < buffer_len(&iqueue)) - fatal("iqueue grew unexpectedly"); - consumed = buf_len - buffer_len(&iqueue); - if (msg_len < consumed) - fatal("msg_len %d < consumed %d", msg_len, consumed); - if (msg_len > consumed) - buffer_consume(&iqueue, msg_len - consumed); -} - -/* Cleanup handler that logs active handles upon normal exit */ -void -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 -usage(void) -{ - extern char *__progname; - - fprintf(stderr, - "usage: %s [-he] [-l log_level] [-f log_facility]\n", __progname); - exit(1); -} - -int -main(int argc, char **argv) -{ - fd_set *rset, *wset; - int in, out, max, ch, skipargs = 0, log_stderr = 0; - ssize_t len, olen, set_size; - SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; - char *cp; - - extern char *optarg; - extern char *__progname; - - /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ - sanitise_stdfd(); - - __progname = ssh_get_progname(argv[0]); - log_init(__progname, log_level, log_facility, log_stderr); - - while (!skipargs && (ch = getopt(argc, argv, "C:f:l:che")) != -1) { - switch (ch) { - 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_level == SYSLOG_FACILITY_NOT_SET) - error("Invalid log facility \"%s\"", optarg); - break; - case 'h': - default: - usage(); - } - } - - log_init(__progname, log_level, log_facility, log_stderr); - - if ((cp = getenv("SSH_CONNECTION")) != NULL) { - client_addr = xstrdup(cp); - if ((cp = strchr(client_addr, ' ')) == NULL) - fatal("Malformed SSH_CONNECTION variable: \"%s\"", - getenv("SSH_CONNECTION")); - *cp = '\0'; - } else - client_addr = xstrdup("UNKNOWN"); - - if ((pw = getpwuid(getuid())) == NULL) - fatal("No user found for uid %lu", (u_long)getuid()); - pw = pwcopy(pw); - - logit("session opened for local user %s from [%s]", - pw->pw_name, client_addr); - - handle_init(); - - in = dup(STDIN_FILENO); - out = dup(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; - - buffer_init(&iqueue); - buffer_init(&oqueue); - - set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); - rset = (fd_set *)xmalloc(set_size); - wset = (fd_set *)xmalloc(set_size); - - for (;;) { - memset(rset, 0, set_size); - memset(wset, 0, set_size); - - FD_SET(in, rset); - olen = buffer_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)); - cleanup_exit(2); - } - - /* copy stdin to iqueue */ - if (FD_ISSET(in, rset)) { - char buf[4*4096]; - len = read(in, buf, sizeof buf); - if (len == 0) { - debug("read eof"); - cleanup_exit(0); - } else if (len < 0) { - error("read: %s", strerror(errno)); - cleanup_exit(1); - } else { - buffer_append(&iqueue, buf, len); - } - } - /* send oqueue to stdout */ - if (FD_ISSET(out, wset)) { - len = write(out, buffer_ptr(&oqueue), olen); - if (len < 0) { - error("write: %s", strerror(errno)); - cleanup_exit(1); - } else { - buffer_consume(&oqueue, len); - } - } - /* process requests from client */ - process(); - } -} |
