Adding upstream version 1.12.0.upstream/1.12.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 391 insertions, 0 deletions

diff --git a/src/hid_linux.c b/src/hid_linux.c
new file mode 100644
index 0000000..841a95b
--- /dev/null
+++ b/src/hid_linux.c
@@ -0,0 +1,391 @@
+/*
+ * Copyright (c) 2019-2022 Yubico AB. All rights reserved.
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file.
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+
+#include <linux/hidraw.h>
+#include <linux/input.h>
+
+#include <errno.h>
+#include <libudev.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "fido.h"
+
+struct hid_linux {
+	int             fd;
+	size_t          report_in_len;
+	size_t          report_out_len;
+	sigset_t        sigmask;
+	const sigset_t *sigmaskp;
+};
+
+static int
+get_report_descriptor(int fd, struct hidraw_report_descriptor *hrd)
+{
+	int s = -1;
+
+	if (ioctl(fd, IOCTL_REQ(HIDIOCGRDESCSIZE), &s) == -1) {
+		fido_log_error(errno, "%s: ioctl HIDIOCGRDESCSIZE", __func__);
+		return (-1);
+	}
+
+	if (s < 0 || (unsigned)s > HID_MAX_DESCRIPTOR_SIZE) {
+		fido_log_debug("%s: HIDIOCGRDESCSIZE %d", __func__, s);
+		return (-1);
+	}
+
+	hrd->size = (unsigned)s;
+
+	if (ioctl(fd, IOCTL_REQ(HIDIOCGRDESC), hrd) == -1) {
+		fido_log_error(errno, "%s: ioctl HIDIOCGRDESC", __func__);
+		return (-1);
+	}
+
+	return (0);
+}
+
+static bool
+is_fido(const char *path)
+{
+	int				 fd = -1;
+	uint32_t			 usage_page = 0;
+	struct hidraw_report_descriptor	*hrd = NULL;
+
+	if ((hrd = calloc(1, sizeof(*hrd))) == NULL ||
+	    (fd = fido_hid_unix_open(path)) == -1)
+		goto out;
+	if (get_report_descriptor(fd, hrd) < 0 ||
+	    fido_hid_get_usage(hrd->value, hrd->size, &usage_page) < 0)
+		usage_page = 0;
+
+out:
+	free(hrd);
+
+	if (fd != -1 && close(fd) == -1)
+		fido_log_error(errno, "%s: close", __func__);
+
+	return (usage_page == 0xf1d0);
+}
+
+static int
+parse_uevent(const char *uevent, int *bus, int16_t *vendor_id,
+    int16_t *product_id)
+{
+	char			*cp;
+	char			*p;
+	char			*s;
+	int			 ok = -1;
+	short unsigned int	 x;
+	short unsigned int	 y;
+	short unsigned int	 z;
+
+	if ((s = cp = strdup(uevent)) == NULL)
+		return (-1);
+
+	while ((p = strsep(&cp, "\n")) != NULL && *p != '\0') {
+		if (strncmp(p, "HID_ID=", 7) == 0) {
+			if (sscanf(p + 7, "%hx:%hx:%hx", &x, &y, &z) == 3) {
+				*bus = (int)x;
+				*vendor_id = (int16_t)y;
+				*product_id = (int16_t)z;
+				ok = 0;
+				break;
+			}
+		}
+	}
+
+	free(s);
+
+	return (ok);
+}
+
+static char *
+get_parent_attr(struct udev_device *dev, const char *subsystem,
+    const char *devtype, const char *attr)
+{
+	struct udev_device	*parent;
+	const char		*value;
+
+	if ((parent = udev_device_get_parent_with_subsystem_devtype(dev,
+	    subsystem, devtype)) == NULL || (value =
+	    udev_device_get_sysattr_value(parent, attr)) == NULL)
+		return (NULL);
+
+	return (strdup(value));
+}
+
+static char *
+get_usb_attr(struct udev_device *dev, const char *attr)
+{
+	return (get_parent_attr(dev, "usb", "usb_device", attr));
+}
+
+static int
+copy_info(fido_dev_info_t *di, struct udev *udev,
+    struct udev_list_entry *udev_entry)
+{
+	const char		*name;
+	const char		*path;
+	char			*uevent = NULL;
+	struct udev_device	*dev = NULL;
+	int			 bus = 0;
+	int			 ok = -1;
+
+	memset(di, 0, sizeof(*di));
+
+	if ((name = udev_list_entry_get_name(udev_entry)) == NULL ||
+	    (dev = udev_device_new_from_syspath(udev, name)) == NULL ||
+	    (path = udev_device_get_devnode(dev)) == NULL ||
+	    is_fido(path) == 0)
+		goto fail;
+
+	if ((uevent = get_parent_attr(dev, "hid", NULL, "uevent")) == NULL ||
+	    parse_uevent(uevent, &bus, &di->vendor_id, &di->product_id) < 0) {
+		fido_log_debug("%s: uevent", __func__);
+		goto fail;
+	}
+
+#ifndef FIDO_HID_ANY
+	if (bus != BUS_USB) {
+		fido_log_debug("%s: bus", __func__);
+		goto fail;
+	}
+#endif
+
+	di->path = strdup(path);
+	if ((di->manufacturer = get_usb_attr(dev, "manufacturer")) == NULL)
+		di->manufacturer = strdup("");
+	if ((di->product = get_usb_attr(dev, "product")) == NULL)
+		di->product = strdup("");
+	if (di->path == NULL || di->manufacturer == NULL || di->product == NULL)
+		goto fail;
+
+	ok = 0;
+fail:
+	if (dev != NULL)
+		udev_device_unref(dev);
+
+	free(uevent);
+
+	if (ok < 0) {
+		free(di->path);
+		free(di->manufacturer);
+		free(di->product);
+		explicit_bzero(di, sizeof(*di));
+	}
+
+	return (ok);
+}
+
+int
+fido_hid_manifest(fido_dev_info_t *devlist, size_t ilen, size_t *olen)
+{
+	struct udev		*udev = NULL;
+	struct udev_enumerate	*udev_enum = NULL;
+	struct udev_list_entry	*udev_list;
+	struct udev_list_entry	*udev_entry;
+	int			 r = FIDO_ERR_INTERNAL;
+
+	*olen = 0;
+
+	if (ilen == 0)
+		return (FIDO_OK); /* nothing to do */
+
+	if (devlist == NULL)
+		return (FIDO_ERR_INVALID_ARGUMENT);
+
+	if ((udev = udev_new()) == NULL ||
+	    (udev_enum = udev_enumerate_new(udev)) == NULL)
+		goto fail;
+
+	if (udev_enumerate_add_match_subsystem(udev_enum, "hidraw") < 0 ||
+	    udev_enumerate_scan_devices(udev_enum) < 0)
+		goto fail;
+
+	if ((udev_list = udev_enumerate_get_list_entry(udev_enum)) == NULL) {
+		r = FIDO_OK; /* zero hidraw devices */
+		goto fail;
+	}
+
+	udev_list_entry_foreach(udev_entry, udev_list) {
+		if (copy_info(&devlist[*olen], udev, udev_entry) == 0) {
+			devlist[*olen].io = (fido_dev_io_t) {
+				fido_hid_open,
+				fido_hid_close,
+				fido_hid_read,
+				fido_hid_write,
+			};
+			if (++(*olen) == ilen)
+				break;
+		}
+	}
+
+	r = FIDO_OK;
+fail:
+	if (udev_enum != NULL)
+		udev_enumerate_unref(udev_enum);
+	if (udev != NULL)
+		udev_unref(udev);
+
+	return (r);
+}
+
+void *
+fido_hid_open(const char *path)
+{
+	struct hid_linux *ctx;
+	struct hidraw_report_descriptor *hrd;
+	struct timespec tv_pause;
+	long interval_ms, retries = 0;
+	bool looped;
+
+retry:
+	looped = false;
+
+	if ((ctx = calloc(1, sizeof(*ctx))) == NULL ||
+	    (ctx->fd = fido_hid_unix_open(path)) == -1) {
+		free(ctx);
+		return (NULL);
+	}
+
+	while (flock(ctx->fd, LOCK_EX|LOCK_NB) == -1) {
+		if (errno != EWOULDBLOCK) {
+			fido_log_error(errno, "%s: flock", __func__);
+			fido_hid_close(ctx);
+			return (NULL);
+		}
+		looped = true;
+		if (retries++ >= 20) {
+			fido_log_debug("%s: flock timeout", __func__);
+			fido_hid_close(ctx);
+			return (NULL);
+		}
+		interval_ms = retries * 100000000L;
+		tv_pause.tv_sec = interval_ms / 1000000000L;
+		tv_pause.tv_nsec = interval_ms % 1000000000L;
+		if (nanosleep(&tv_pause, NULL) == -1) {
+			fido_log_error(errno, "%s: nanosleep", __func__);
+			fido_hid_close(ctx);
+			return (NULL);
+		}
+	}
+
+	if (looped) {
+		fido_log_debug("%s: retrying", __func__);
+		fido_hid_close(ctx);
+		goto retry;
+	}
+
+	if ((hrd = calloc(1, sizeof(*hrd))) == NULL ||
+	    get_report_descriptor(ctx->fd, hrd) < 0 ||
+	    fido_hid_get_report_len(hrd->value, hrd->size, &ctx->report_in_len,
+	    &ctx->report_out_len) < 0 || ctx->report_in_len == 0 ||
+	    ctx->report_out_len == 0) {
+		fido_log_debug("%s: using default report sizes", __func__);
+		ctx->report_in_len = CTAP_MAX_REPORT_LEN;
+		ctx->report_out_len = CTAP_MAX_REPORT_LEN;
+	}
+
+	free(hrd);
+
+	return (ctx);
+}
+
+void
+fido_hid_close(void *handle)
+{
+	struct hid_linux *ctx = handle;
+
+	if (close(ctx->fd) == -1)
+		fido_log_error(errno, "%s: close", __func__);
+
+	free(ctx);
+}
+
+int
+fido_hid_set_sigmask(void *handle, const fido_sigset_t *sigmask)
+{
+	struct hid_linux *ctx = handle;
+
+	ctx->sigmask = *sigmask;
+	ctx->sigmaskp = &ctx->sigmask;
+
+	return (FIDO_OK);
+}
+
+int
+fido_hid_read(void *handle, unsigned char *buf, size_t len, int ms)
+{
+	struct hid_linux	*ctx = handle;
+	ssize_t			 r;
+
+	if (len != ctx->report_in_len) {
+		fido_log_debug("%s: len %zu", __func__, len);
+		return (-1);
+	}
+
+	if (fido_hid_unix_wait(ctx->fd, ms, ctx->sigmaskp) < 0) {
+		fido_log_debug("%s: fd not ready", __func__);
+		return (-1);
+	}
+
+	if ((r = read(ctx->fd, buf, len)) == -1) {
+		fido_log_error(errno, "%s: read", __func__);
+		return (-1);
+	}
+
+	if (r < 0 || (size_t)r != len) {
+		fido_log_debug("%s: %zd != %zu", __func__, r, len);
+		return (-1);
+	}
+
+	return ((int)r);
+}
+
+int
+fido_hid_write(void *handle, const unsigned char *buf, size_t len)
+{
+	struct hid_linux	*ctx = handle;
+	ssize_t			 r;
+
+	if (len != ctx->report_out_len + 1) {
+		fido_log_debug("%s: len %zu", __func__, len);
+		return (-1);
+	}
+
+	if ((r = write(ctx->fd, buf, len)) == -1) {
+		fido_log_error(errno, "%s: write", __func__);
+		return (-1);
+	}
+
+	if (r < 0 || (size_t)r != len) {
+		fido_log_debug("%s: %zd != %zu", __func__, r, len);
+		return (-1);
+	}
+
+	return ((int)r);
+}
+
+size_t
+fido_hid_report_in_len(void *handle)
+{
+	struct hid_linux *ctx = handle;
+
+	return (ctx->report_in_len);
+}
+
+size_t
+fido_hid_report_out_len(void *handle)
+{
+	struct hid_linux *ctx = handle;
+
+	return (ctx->report_out_len);
+}