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ksmbd: change security id to the one samba used for posix extension

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[ Upstream commit 5609bdd9ff ]

Samba set SIDOWNER and SIDUNIX_GROUP in create posix context and
set SIDUNIX_USER/GROUP in other sids for posix extension.
This patch change security id to the one samba used.

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon
2023-12-19 00:33:13 +09:00
committed by Greg Kroah-Hartman
parent 62e6846ee3
commit 813ef06ea2
3 changed files with 25 additions and 7 deletions
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17
fs/ksmbd/oplock.c
View File

@@ -1615,7 +1615,11 @@ void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
memset(buf, 0, sizeof(struct create_posix_rsp));
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_posix_rsp, nlink));
buf->ccontext.DataLength = cpu_to_le32(52);
/*
* DataLength = nlink(4) + reparse_tag(4) + mode(4) +
* domain sid(28) + unix group sid(16).
*/
buf->ccontext.DataLength = cpu_to_le32(56);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_posix_rsp, Name));
buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
@@ -1640,12 +1644,19 @@ void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
buf->nlink = cpu_to_le32(inode->i_nlink);
buf->reparse_tag = cpu_to_le32(fp->volatile_id);
buf->mode = cpu_to_le32(inode->i_mode);
/*
* SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)).
* Domain sid(28) = revision(1) + num_subauth(1) + authority(6) +
* sub_auth(4 * 4(num_subauth)) + RID(4).
* UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) +
* sub_auth(4 * 1(num_subauth)) + RID(4).
*/
id_to_sid(from_kuid_munged(&init_user_ns,
i_uid_into_mnt(user_ns, inode)),
SIDNFS_USER, (struct smb_sid *)&buf->SidBuffer[0]);
SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]);
id_to_sid(from_kgid_munged(&init_user_ns,
i_gid_into_mnt(user_ns, inode)),
SIDNFS_GROUP, (struct smb_sid *)&buf->SidBuffer[20]);
SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]);
}
/*

9
fs/ksmbd/smb2pdu.c
View File

@@ -3619,10 +3619,15 @@ static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level,
S_ISDIR(ksmbd_kstat->kstat->mode) ? ATTR_DIRECTORY_LE : ATTR_ARCHIVE_LE;
if (d_info->hide_dot_file && d_info->name[0] == '.')
posix_info->DosAttributes |= ATTR_HIDDEN_LE;
/*
* SidBuffer(32) contain two sids(Domain sid(16), UNIX group sid(16)).
* UNIX sid(16) = revision(1) + num_subauth(1) + authority(6) +
* sub_auth(4 * 1(num_subauth)) + RID(4).
*/
id_to_sid(from_kuid_munged(&init_user_ns, ksmbd_kstat->kstat->uid),
SIDNFS_USER, (struct smb_sid *)&posix_info->SidBuffer[0]);
SIDUNIX_USER, (struct smb_sid *)&posix_info->SidBuffer[0]);
id_to_sid(from_kgid_munged(&init_user_ns, ksmbd_kstat->kstat->gid),
SIDNFS_GROUP, (struct smb_sid *)&posix_info->SidBuffer[20]);
SIDUNIX_GROUP, (struct smb_sid *)&posix_info->SidBuffer[16]);
memcpy(posix_info->name, conv_name, conv_len);
posix_info->name_len = cpu_to_le32(conv_len);
posix_info->NextEntryOffset = cpu_to_le32(next_entry_offset);

6
fs/ksmbd/smb2pdu.h
View File

@@ -724,7 +724,8 @@ struct create_posix_rsp {
__le32 nlink;
__le32 reparse_tag;
__le32 mode;
u8 SidBuffer[40];
/* SidBuffer contain two sids(Domain sid(28), UNIX group sid(16)) */
u8 SidBuffer[44];
} __packed;
#define SMB2_LEASE_NONE_LE cpu_to_le32(0x00)
@@ -1617,7 +1618,8 @@ struct smb2_posix_info {
__le32 HardLinks;
__le32 ReparseTag;
__le32 Mode;
u8 SidBuffer[40];
/* SidBuffer contain two sids (UNIX user sid(16), UNIX group sid(16)) */
u8 SidBuffer[32];
__le32 name_len;
u8 name[1];
/*