1/*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source.  A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12/*
13 * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
14 */
15
16/*
17 * Create context handler for "AAPL" extensions.
18 * See: smbsrv/smb2_aapl.h for documentation.
19 */
20
21#include <smbsrv/smb2_kproto.h>
22#include <smbsrv/smb2_aapl.h>
23#include <smbsrv/smb_fsops.h>
24
25/* SMB2 AAPL extensions: enabled? */
26int smb2_aapl_extensions = 1;
27
28/*
29 * smb2_aapl_server_caps is a flags word containing detailed
30 * capabilities as shown in smb2_aapl.h (kAPPL_...)
31 *
32 * We actually can support OSX_COPYFILE but modern MacOS clients
33 * work better using the plain old FSCTL_SRV_COPYCHUNK ioctl, which
34 * avoids our needing to handle all the meta-data and streams.
35 *
36 * We could turn on kAAPL_UNIX_BASED below and report UNIX modes in
37 * directory listings (see smb2_aapl_get_macinfo below) but we don't
38 * because the modes ZFS presents with non-trivial ACLs cause mac
39 * clients to misbehave when copying files from the share to local.
40 * For example, we may have a file that we can read, but which has
41 * mode 0200.  When the mac copies such a file to the local disk,
42 * the copy cannot be opened for read.  For now just turn off the
43 * kAAPL_UNIX_BASED flag.  Later we might set this flag and return
44 * modes only when we have a trivial ACL.
45 */
46uint64_t smb2_aapl_server_caps =
47	kAAPL_SUPPORTS_READ_DIR_ATTR;
48	/* | kAAPL_SUPPORTS_OSX_COPYFILE */
49	/* | kAAPL_UNIX_BASED; */
50
51uint64_t smb2_aapl_volume_caps = kAAPL_SUPPORTS_FULL_SYNC;
52
53/*
54 * Normally suppress file IDs for MacOS because it
55 * requires them to be unique per share, and ours
56 * can have duplicates under .zfs or sub-mounts.
57 */
58int smb2_aapl_use_file_ids = 0;
59
60static uint32_t smb2_aapl_srv_query(smb_request_t *,
61	mbuf_chain_t *, mbuf_chain_t *);
62
63static int smb_aapl_ext_maxlen = 512;
64
65/*
66 * Decode an AAPL create context (command code) and build the
67 * corresponding AAPL c.c. response.
68 */
69uint32_t
70smb2_aapl_crctx(smb_request_t *sr,
71    mbuf_chain_t *mbcin,
72    mbuf_chain_t *mbcout)
73{
74	uint32_t cmdcode;
75	uint32_t status;
76	int rc;
77
78	if (smb2_aapl_extensions == 0)
79		return (NT_STATUS_NOT_SUPPORTED);
80
81	rc = smb_mbc_decodef(mbcin, "l4.", &cmdcode);
82	if (rc != 0)
83		return (NT_STATUS_INFO_LENGTH_MISMATCH);
84	mbcout->max_bytes = smb_aapl_ext_maxlen;
85	(void) smb_mbc_encodef(mbcout, "ll", cmdcode, 0);
86
87	switch (cmdcode) {
88	case kAAPL_SERVER_QUERY:
89		status = smb2_aapl_srv_query(sr, mbcin, mbcout);
90		break;
91	case kAAPL_RESOLVE_ID:
92	default:
93		status = NT_STATUS_INVALID_INFO_CLASS;
94		break;
95	}
96
97	return (status);
98}
99
100/*
101 * Handle an AAPL c.c. kAAPL_SERVER_QUERY
102 * Return our Mac-ish capabilities.  We also need to remember
103 * that this client wants AAPL readdir etc.
104 * Typically see: client_bitmap=7, client_caps=7
105 */
106static uint32_t
107smb2_aapl_srv_query(smb_request_t *sr,
108    mbuf_chain_t *mbcin, mbuf_chain_t *mbcout)
109{
110	uint64_t client_bitmap;
111	uint64_t client_caps;
112	uint64_t server_bitmap;
113	int rc;
114
115	rc = smb_mbc_decodef(
116	    mbcin, "qq",
117	    &client_bitmap,
118	    &client_caps);
119	if (rc != 0)
120		return (NT_STATUS_INFO_LENGTH_MISMATCH);
121
122	smb_rwx_rwenter(&sr->session->s_lock, RW_WRITER);
123
124	/* Remember that this is a MacOS client. */
125	sr->session->native_os = NATIVE_OS_MACOS;
126	sr->session->s_flags |= SMB_SSN_AAPL_CCEXT;
127
128	/*
129	 * Select which parts of the bitmap we use.
130	 */
131	server_bitmap = client_bitmap &
132	    (kAAPL_SERVER_CAPS | kAAPL_VOLUME_CAPS);
133	(void) smb_mbc_encodef(mbcout, "q", server_bitmap);
134
135	if ((server_bitmap & kAAPL_SERVER_CAPS) != 0) {
136		uint64_t server_caps =
137		    smb2_aapl_server_caps & client_caps;
138		if (server_caps & kAAPL_SUPPORTS_READ_DIR_ATTR)
139			sr->session->s_flags |= SMB_SSN_AAPL_READDIR;
140		(void) smb_mbc_encodef(mbcout, "q", server_caps);
141	}
142	if ((server_bitmap & kAAPL_VOLUME_CAPS) != 0) {
143		(void) smb_mbc_encodef(mbcout, "q", smb2_aapl_volume_caps);
144	}
145
146	/* Pad2, null model string. */
147	(void) smb_mbc_encodef(mbcout, "ll", 0, 0);
148
149	smb_rwx_rwexit(&sr->session->s_lock);
150
151	return (0);
152}
153
154/*
155 * Get additional information about a directory entry
156 * needed when MacOS is using the AAPL extensions.
157 * This is called after smb_odir_read_fileinfo has
158 * filled in the fileinfo.  This fills in macinfo.
159 *
160 * This does a couple FS operations per directory entry.
161 * That has some cost, but if we don't do it for them here,
162 * the client has to make two more round trips for each
163 * directory entry, which is much worse.
164 */
165int
166smb2_aapl_get_macinfo(smb_request_t *sr, smb_odir_t *od,
167    smb_fileinfo_t *fileinfo, smb_macinfo_t *mi,
168    char *tbuf, size_t tbuflen)
169{
170	int		rc;
171	cred_t		*kcr = zone_kcred();
172	smb_node_t	*fnode, *snode;
173	smb_attr_t	attr;
174	uint32_t	AfpInfo[15];
175
176	bzero(mi, sizeof (*mi));
177
178	rc = smb_fsop_lookup(sr, od->d_cred, SMB_CASE_SENSITIVE,
179	    od->d_tree->t_snode, od->d_dnode, fileinfo->fi_name, &fnode);
180	if (rc != 0)
181		return (rc);
182	/* Note: hold ref on fnode, must release */
183
184	smb_fsop_eaccess(sr, od->d_cred, fnode, &mi->mi_maxaccess);
185
186	/*
187	 * mi_rforksize
188	 * Get length of stream: "AFP_Resource"
189	 * Return size=zero if not found.
190	 */
191	(void) snprintf(tbuf, tbuflen, "%s:AFP_Resource", fileinfo->fi_name);
192	rc = smb_fsop_lookup_name(sr, kcr, 0, sr->tid_tree->t_snode,
193	    od->d_dnode, tbuf, &snode);
194	if (rc == 0) {
195		bzero(&attr, sizeof (attr));
196		attr.sa_mask = SMB_AT_SIZE | SMB_AT_ALLOCSZ;
197		rc = smb_node_getattr(NULL, snode, kcr, NULL, &attr);
198		if (rc == 0) {
199			mi->mi_rforksize = attr.sa_vattr.va_size;
200		}
201		smb_node_release(snode);
202		snode = NULL;
203	}
204
205	/*
206	 * mi_finder
207	 * Get contents of stream: "AFP_AfpInfo"
208	 * read 60 bytes, copy 32 bytes at off 16
209	 */
210	(void) snprintf(tbuf, tbuflen, "%s:AFP_AfpInfo", fileinfo->fi_name);
211	rc = smb_fsop_lookup_name(sr, kcr, 0, sr->tid_tree->t_snode,
212	    od->d_dnode, tbuf, &snode);
213	if (rc == 0) {
214		iovec_t iov;
215		uio_t uio;
216
217		bzero(&AfpInfo, sizeof (AfpInfo));
218		bzero(&uio, sizeof (uio));
219
220		iov.iov_base = (void *) &AfpInfo;
221		iov.iov_len = sizeof (AfpInfo);
222		uio.uio_iov = &iov;
223		uio.uio_iovcnt = 1;
224		uio.uio_resid = sizeof (AfpInfo);
225		uio.uio_segflg = UIO_SYSSPACE;
226		uio.uio_extflg = UIO_COPY_DEFAULT;
227		rc = smb_fsop_read(sr, kcr, snode, NULL, &uio, 0);
228		if (rc == 0 && uio.uio_resid == 0) {
229			bcopy(&AfpInfo[4], &mi->mi_finderinfo,
230			    sizeof (mi->mi_finderinfo));
231		}
232		smb_node_release(snode);
233		snode = NULL;
234	}
235
236	/*
237	 * Later: Fill in the mode if we have a trivial ACL
238	 * (otherwise leaving it zero as we do now).
239	 */
240	if (smb2_aapl_server_caps & kAAPL_UNIX_BASED) {
241		bzero(&attr, sizeof (attr));
242		attr.sa_mask = SMB_AT_MODE;
243		rc = smb_node_getattr(NULL, fnode, kcr, NULL, &attr);
244		if (rc == 0) {
245			mi->mi_unixmode = (uint16_t)attr.sa_vattr.va_mode;
246		}
247	}
248
249	smb_node_release(fnode);
250	return (0);
251}
252