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upstream: sftp client library support for 

users-groups-by-id@openssh.com; ok markus@

OpenBSD-Commit-ID: ddb2f33a2da6349a9a89a8b5bcb9ca7c999394de
This commit is contained in:
djm@openbsd.org 2022-09-19 10:43:12 +00:00 committed by Damien Miller
parent 488f6e1c58
commit 8ff680368b
No known key found for this signature in database
2 changed files with 140 additions and 11 deletions
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122
sftp-client.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sftp-client.c,v 1.164 2022/05/15 23:47:21 djm Exp $ */
/* $OpenBSD: sftp-client.c,v 1.165 2022/09/19 10:43:12 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
@ -104,6 +104,7 @@ struct sftp_conn {
#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;
@ -539,6 +540,11 @@ do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests,
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_COPY_DATA;
known = 1;
} else if (strcmp(name,
"users-groups-by-id@openssh.com") == 0 &&
strcmp((char *)value, "1") == 0) {
ret->exts |= SFTP_EXT_GETUSERSGROUPS_BY_ID;
known = 1;
}
if (known) {
debug2("Server supports extension \"%s\" revision %s",
@ -2752,6 +2758,120 @@ crossload_dir(struct sftp_conn *from, struct sftp_conn *to,
return ret;
}
int
can_get_users_groups_by_id(struct sftp_conn *conn)
{
return (conn->exts & SFTP_EXT_GETUSERSGROUPS_BY_ID) != 0;
}
int
do_get_users_groups_by_id(struct sftp_conn *conn,
const u_int *uids, u_int nuids,
const u_int *gids, u_int ngids,
char ***usernamesp, char ***groupnamesp)
{
struct sshbuf *msg, *uidbuf, *gidbuf;
u_int i, expected_id, id;
char *name, **usernames = NULL, **groupnames = NULL;
u_char type;
int r;
*usernamesp = *groupnamesp = NULL;
if (!can_get_users_groups_by_id(conn))
return SSH_ERR_FEATURE_UNSUPPORTED;
if ((msg = sshbuf_new()) == NULL ||
(uidbuf = sshbuf_new()) == NULL ||
(gidbuf = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
expected_id = id = conn->msg_id++;
debug2("Sending SSH2_FXP_EXTENDED(users-groups-by-id@openssh.com)");
for (i = 0; i < nuids; i++) {
if ((r = sshbuf_put_u32(uidbuf, uids[i])) != 0)
fatal_fr(r, "compose uids");
}
for (i = 0; i < ngids; i++) {
if ((r = sshbuf_put_u32(gidbuf, gids[i])) != 0)
fatal_fr(r, "compose gids");
}
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_cstring(msg,
"users-groups-by-id@openssh.com")) != 0 ||
(r = sshbuf_put_stringb(msg, uidbuf)) != 0 ||
(r = sshbuf_put_stringb(msg, gidbuf)) != 0)
fatal_fr(r, "compose");
send_msg(conn, msg);
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;
char *errmsg;
if ((r = sshbuf_get_u32(msg, &status)) != 0 ||
(r = sshbuf_get_cstring(msg, &errmsg, NULL)) != 0)
fatal_fr(r, "parse status");
error("users-groups-by-id %s",
*errmsg == '\0' ? fx2txt(status) : errmsg);
free(errmsg);
sshbuf_free(msg);
sshbuf_free(uidbuf);
sshbuf_free(gidbuf);
return -1;
} else if (type != SSH2_FXP_EXTENDED_REPLY)
fatal("Expected SSH2_FXP_EXTENDED_REPLY(%u) packet, got %u",
SSH2_FXP_EXTENDED_REPLY, type);
/* reuse */
sshbuf_free(uidbuf);
sshbuf_free(gidbuf);
uidbuf = gidbuf = NULL;
if ((r = sshbuf_froms(msg, &uidbuf)) != 0 ||
(r = sshbuf_froms(msg, &gidbuf)) != 0)
fatal_fr(r, "parse response");
if (nuids > 0) {
usernames = xcalloc(nuids, sizeof(*usernames));
for (i = 0; i < nuids; i++) {
if ((r = sshbuf_get_cstring(uidbuf, &name, NULL)) != 0)
fatal_fr(r, "parse user name");
/* Handle unresolved names */
if (*name == '\0') {
free(name);
name = NULL;
}
usernames[i] = name;
}
}
if (ngids > 0) {
groupnames = xcalloc(ngids, sizeof(*groupnames));
for (i = 0; i < ngids; i++) {
if ((r = sshbuf_get_cstring(gidbuf, &name, NULL)) != 0)
fatal_fr(r, "parse user name");
/* Handle unresolved names */
if (*name == '\0') {
free(name);
name = NULL;
}
groupnames[i] = name;
}
}
if (sshbuf_len(uidbuf) != 0)
fatal_f("unexpected extra username data");
if (sshbuf_len(gidbuf) != 0)
fatal_f("unexpected extra groupname data");
sshbuf_free(uidbuf);
sshbuf_free(gidbuf);
sshbuf_free(msg);
/* success */
*usernamesp = usernames;
*groupnamesp = groupnames;
return 0;
}
char *
path_append(const char *p1, const char *p2)
{

11
sftp-client.h
View File

@ -1,4 +1,4 @@
/* $OpenBSD: sftp-client.h,v 1.37 2022/05/13 06:31:50 djm Exp $ */
/* $OpenBSD: sftp-client.h,v 1.38 2022/09/19 10:43:12 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
@ -183,6 +183,15 @@ int crossload_dir(struct sftp_conn *from, struct sftp_conn *to,
Attrib *dirattrib, int preserve_flag, int print_flag,
int follow_link_flag);
/*
* User/group ID to name translation.
*/
int can_get_users_groups_by_id(struct sftp_conn *conn);
int do_get_users_groups_by_id(struct sftp_conn *conn,
const u_int *uids, u_int nuids,
const u_int *gids, u_int ngids,
char ***usernamesp, char ***groupnamesp);
/* Concatenate paths, taking care of slashes. Caller must free result. */
char *path_append(const char *, const char *);