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Date: Sat, 19 Oct 2013 16:39:07 +0200
From: Dominik Paulus <dominik.paulus@....de>
To: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Dominik Paulus <dominik.paulus@....de>,
Kurt Kanzenbach <ly80toro@....cs.fau.de>,
Tobias Polzer <tobias.polzer@....de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Anthony Foiani <anthony.foiani@...il.com>,
devel@...verdev.osuosl.org, linux-kernel@...cs.fau.de,
linux-kernel@...r.kernel.org, tobias.polzer@....de,
Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Subject: [PATCHv4 04/16] staging: usbip: Add ACL support to usbip bind
Add the command line argument -a (--allow) to usbip bind to specify
networks allowed to attach to the device and code to store the ACLs in
sysfs.
Signed-off-by: Kurt Kanzenbach <ly80toro@....cs.fau.de>
Signed-off-by: Dominik Paulus <dominik.paulus@....de>
Signed-off-by: Tobias Polzer <tobias.polzer@....de>
---
drivers/staging/usbip/userspace/doc/usbip.8 | 8 ++-
drivers/staging/usbip/userspace/src/usbip_bind.c | 74 ++++++++++++++++++++----
2 files changed, 69 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/usbip/userspace/doc/usbip.8 b/drivers/staging/usbip/userspace/doc/usbip.8
index 847aa40..c7ba36f 100644
--- a/drivers/staging/usbip/userspace/doc/usbip.8
+++ b/drivers/staging/usbip/userspace/doc/usbip.8
@@ -60,9 +60,15 @@ Detach an imported USB device.
.PP
.HP
-\fBbind\fR \-\-busid=<\fIbusid\fR>
+\fBbind\fR \-\-busid=<\fIbusid\fR> [\-\-allow=<\fICIDR mask\fR>...]
.IP
Make a device exportable.
+.br
+\-\-allow accepts CIDR masks like 127.0.0.0/8 or fd00::/64
+.br
+Only hosts in (at least) one of the allowed ranges are accepted. If
+\-\-allow is omitted, 0.0.0.0/0 and ::/0 are added to the list. The list can
+be read/written from corresponding \fBusbip_acl\fR file in sysfs after bind.
.PP
.HP
diff --git a/drivers/staging/usbip/userspace/src/usbip_bind.c b/drivers/staging/usbip/userspace/src/usbip_bind.c
index 9ecaf6e..d2739fc 100644
--- a/drivers/staging/usbip/userspace/src/usbip_bind.c
+++ b/drivers/staging/usbip/userspace/src/usbip_bind.c
@@ -37,8 +37,9 @@ enum unbind_status {
static const char usbip_bind_usage_string[] =
"usbip bind <args>\n"
- " -b, --busid=<busid> Bind " USBIP_HOST_DRV_NAME ".ko to device "
- "on <busid>\n";
+ " -b, --busid=<busid> Bind " USBIP_HOST_DRV_NAME ".ko to "
+ "device on <busid>\n"
+ " -a, --allow=<CIDR mask> Restrict device access to <CIDR mask>\n";
void usbip_bind_usage(void)
{
@@ -46,17 +47,19 @@ void usbip_bind_usage(void)
}
/* call at unbound state */
-static int bind_usbip(char *busid)
+static int bind_usbip(char *busid, char *allow)
{
char bus_type[] = "usb";
char attr_name[] = "bind";
char sysfs_mntpath[SYSFS_PATH_MAX];
char bind_attr_path[SYSFS_PATH_MAX];
char intf_busid[SYSFS_BUS_ID_SIZE];
+ char ip_attr_path[SYSFS_PATH_MAX];
struct sysfs_device *busid_dev;
struct sysfs_attribute *bind_attr;
struct sysfs_attribute *bConfValue;
struct sysfs_attribute *bNumIntfs;
+ struct sysfs_attribute *usbip_ip;
int i, failed = 0;
int rc, ret = -1;
@@ -101,8 +104,32 @@ static int bind_usbip(char *busid)
dbg("bind driver at %s failed", intf_busid);
failed = 1;
}
+
+ }
+
+ /*
+ * store allowed IP ranges
+ * specified by `usbip bind -b <busid> --allow <CIDR mask>`
+ */
+ snprintf(ip_attr_path, sizeof(ip_attr_path),
+ "%s/%s/%s/%s/%s/%s:%.1s.%d/%s",
+ sysfs_mntpath, SYSFS_BUS_NAME, bus_type,
+ SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, busid,
+ bConfValue->value, 0, "usbip_acl");
+
+ usbip_ip = sysfs_open_attribute(ip_attr_path);
+ if (!usbip_ip) {
+ err("sysfs_open_attribute failed: path=%s",
+ ip_attr_path);
+ goto err_close_busid_dev;
}
+ rc = sysfs_write_attribute(usbip_ip, allow, strlen(allow));
+ if (rc)
+ err("sysfs_write_attribute failed");
+
+ sysfs_close_attribute(usbip_ip);
+
if (!failed)
ret = 0;
@@ -213,7 +240,7 @@ out:
return status;
}
-static int bind_device(char *busid)
+static int bind_device(char *busid, char *allow)
{
int rc;
@@ -233,7 +260,7 @@ static int bind_device(char *busid)
return -1;
}
- rc = bind_usbip(busid);
+ rc = bind_usbip(busid, allow);
if (rc < 0) {
err("could not bind device to %s", USBIP_HOST_DRV_NAME);
modify_match_busid(busid, 0);
@@ -249,29 +276,52 @@ int usbip_bind(int argc, char *argv[])
{
static const struct option opts[] = {
{ "busid", required_argument, NULL, 'b' },
+ { "allow", required_argument, NULL, 'a' },
{ NULL, 0, NULL, 0 }
};
- int opt;
- int ret = -1;
+ int opt, rc;
+ char allow[4096];
+ char *device = NULL;
+ struct subnet subnet;
+
+ allow[0] = 0;
for (;;) {
- opt = getopt_long(argc, argv, "b:", opts, NULL);
+ opt = getopt_long(argc, argv, "a:b:", opts, NULL);
if (opt == -1)
break;
switch (opt) {
+ case 'a':
+ rc = parse_cidr(optarg, &subnet);
+ if (rc < 0) {
+ err("Invalid subnet specified: %s", optarg);
+ goto err_out;
+ }
+
+ if (strlen(allow) < sizeof(allow) - strlen(optarg) - 2)
+ sprintf(allow + strlen(allow), "%s\n", optarg);
+ else
+ err("ACL length too long.");
+ break;
case 'b':
- ret = bind_device(optarg);
- goto out;
+ device = optarg;
+ break;
default:
goto err_out;
}
}
+ /* By default, allow access from all IPs */
+ if (!allow[0])
+ strcpy(allow, "::/0\n0.0.0.0/0\n");
+
+ if (device)
+ return bind_device(device, allow);
+
err_out:
usbip_bind_usage();
-out:
- return ret;
+ return -1;
}
--
1.8.4.1
--
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