diff options
Diffstat (limited to 'hw/tpm/tpm_util.c')
| -rw-r--r-- | hw/tpm/tpm_util.c | 377 |
1 files changed, 0 insertions, 377 deletions
diff --git a/hw/tpm/tpm_util.c b/hw/tpm/tpm_util.c deleted file mode 100644 index c0a0f3d71f..0000000000 --- a/hw/tpm/tpm_util.c +++ /dev/null @@ -1,377 +0,0 @@ -/* - * TPM utility functions - * - * Copyright (c) 2010 - 2015 IBM Corporation - * Authors: - * Stefan Berger <stefanb@us.ibm.com> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/> - */ - -#include "qemu/osdep.h" -#include "qemu/error-report.h" -#include "qapi/error.h" -#include "qapi/visitor.h" -#include "tpm_util.h" -#include "tpm_int.h" -#include "exec/memory.h" -#include "hw/qdev-properties.h" -#include "sysemu/tpm_backend.h" -#include "trace.h" - -/* tpm backend property */ - -static void get_tpm(Object *obj, Visitor *v, const char *name, void *opaque, - Error **errp) -{ - DeviceState *dev = DEVICE(obj); - TPMBackend **be = qdev_get_prop_ptr(dev, opaque); - char *p; - - p = g_strdup(*be ? (*be)->id : ""); - visit_type_str(v, name, &p, errp); - g_free(p); -} - -static void set_tpm(Object *obj, Visitor *v, const char *name, void *opaque, - Error **errp) -{ - DeviceState *dev = DEVICE(obj); - Error *local_err = NULL; - Property *prop = opaque; - TPMBackend *s, **be = qdev_get_prop_ptr(dev, prop); - char *str; - - if (dev->realized) { - qdev_prop_set_after_realize(dev, name, errp); - return; - } - - visit_type_str(v, name, &str, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return; - } - - s = qemu_find_tpm_be(str); - if (s == NULL) { - error_setg(errp, "Property '%s.%s' can't find value '%s'", - object_get_typename(obj), prop->name, str); - } else if (tpm_backend_init(s, TPM_IF(obj), errp) == 0) { - *be = s; /* weak reference, avoid cyclic ref */ - } - g_free(str); -} - -static void release_tpm(Object *obj, const char *name, void *opaque) -{ - DeviceState *dev = DEVICE(obj); - Property *prop = opaque; - TPMBackend **be = qdev_get_prop_ptr(dev, prop); - - if (*be) { - tpm_backend_reset(*be); - } -} - -const PropertyInfo qdev_prop_tpm = { - .name = "str", - .description = "ID of a tpm to use as a backend", - .get = get_tpm, - .set = set_tpm, - .release = release_tpm, -}; - -/* - * Write an error message in the given output buffer. - */ -void tpm_util_write_fatal_error_response(uint8_t *out, uint32_t out_len) -{ - if (out_len >= sizeof(struct tpm_resp_hdr)) { - tpm_cmd_set_tag(out, TPM_TAG_RSP_COMMAND); - tpm_cmd_set_size(out, sizeof(struct tpm_resp_hdr)); - tpm_cmd_set_error(out, TPM_FAIL); - } -} - -bool tpm_util_is_selftest(const uint8_t *in, uint32_t in_len) -{ - if (in_len >= sizeof(struct tpm_req_hdr)) { - return tpm_cmd_get_ordinal(in) == TPM_ORD_ContinueSelfTest; - } - - return false; -} - -/* - * Send request to a TPM device. We expect a response within one second. - */ -static int tpm_util_request(int fd, - const void *request, - size_t requestlen, - void *response, - size_t responselen) -{ - fd_set readfds; - int n; - struct timeval tv = { - .tv_sec = 1, - .tv_usec = 0, - }; - - n = write(fd, request, requestlen); - if (n < 0) { - return -errno; - } - if (n != requestlen) { - return -EFAULT; - } - - FD_ZERO(&readfds); - FD_SET(fd, &readfds); - - /* wait for a second */ - n = select(fd + 1, &readfds, NULL, NULL, &tv); - if (n != 1) { - return -errno; - } - - n = read(fd, response, responselen); - if (n < sizeof(struct tpm_resp_hdr)) { - return -EFAULT; - } - - /* check the header */ - if (tpm_cmd_get_size(response) != n) { - return -EMSGSIZE; - } - - return 0; -} - -/* - * A basic test of a TPM device. We expect a well formatted response header - * (error response is fine). - */ -static int tpm_util_test(int fd, - const void *request, - size_t requestlen, - uint16_t *return_tag) -{ - char buf[1024]; - ssize_t ret; - - ret = tpm_util_request(fd, request, requestlen, - buf, sizeof(buf)); - if (ret < 0) { - return ret; - } - - *return_tag = tpm_cmd_get_tag(buf); - - return 0; -} - -/* - * Probe for the TPM device in the back - * Returns 0 on success with the version of the probed TPM set, 1 on failure. - */ -int tpm_util_test_tpmdev(int tpm_fd, TPMVersion *tpm_version) -{ - /* - * Sending a TPM1.2 command to a TPM2 should return a TPM1.2 - * header (tag = 0xc4) and error code (TPM_BADTAG = 0x1e) - * - * Sending a TPM2 command to a TPM 2 will give a TPM 2 tag in the - * header. - * Sending a TPM2 command to a TPM 1.2 will give a TPM 1.2 tag - * in the header and an error code. - */ - const struct tpm_req_hdr test_req = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .len = cpu_to_be32(sizeof(test_req)), - .ordinal = cpu_to_be32(TPM_ORD_GetTicks), - }; - - const struct tpm_req_hdr test_req_tpm2 = { - .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), - .len = cpu_to_be32(sizeof(test_req_tpm2)), - .ordinal = cpu_to_be32(TPM2_CC_ReadClock), - }; - uint16_t return_tag; - int ret; - - /* Send TPM 2 command */ - ret = tpm_util_test(tpm_fd, &test_req_tpm2, - sizeof(test_req_tpm2), &return_tag); - /* TPM 2 would respond with a tag of TPM2_ST_NO_SESSIONS */ - if (!ret && return_tag == TPM2_ST_NO_SESSIONS) { - *tpm_version = TPM_VERSION_2_0; - return 0; - } - - /* Send TPM 1.2 command */ - ret = tpm_util_test(tpm_fd, &test_req, - sizeof(test_req), &return_tag); - if (!ret && return_tag == TPM_TAG_RSP_COMMAND) { - *tpm_version = TPM_VERSION_1_2; - /* this is a TPM 1.2 */ - return 0; - } - - *tpm_version = TPM_VERSION_UNSPEC; - - return 1; -} - -int tpm_util_get_buffer_size(int tpm_fd, TPMVersion tpm_version, - size_t *buffersize) -{ - int ret; - - switch (tpm_version) { - case TPM_VERSION_1_2: { - const struct tpm_req_get_buffer_size { - struct tpm_req_hdr hdr; - uint32_t capability; - uint32_t len; - uint32_t subcap; - } QEMU_PACKED tpm_get_buffer_size = { - .hdr = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .len = cpu_to_be32(sizeof(tpm_get_buffer_size)), - .ordinal = cpu_to_be32(TPM_ORD_GetCapability), - }, - .capability = cpu_to_be32(TPM_CAP_PROPERTY), - .len = cpu_to_be32(sizeof(uint32_t)), - .subcap = cpu_to_be32(TPM_CAP_PROP_INPUT_BUFFER), - }; - struct tpm_resp_get_buffer_size { - struct tpm_resp_hdr hdr; - uint32_t len; - uint32_t buffersize; - } QEMU_PACKED tpm_resp; - - ret = tpm_util_request(tpm_fd, &tpm_get_buffer_size, - sizeof(tpm_get_buffer_size), - &tpm_resp, sizeof(tpm_resp)); - if (ret < 0) { - return ret; - } - - if (be32_to_cpu(tpm_resp.hdr.len) != sizeof(tpm_resp) || - be32_to_cpu(tpm_resp.len) != sizeof(uint32_t)) { - trace_tpm_util_get_buffer_size_hdr_len( - be32_to_cpu(tpm_resp.hdr.len), - sizeof(tpm_resp)); - trace_tpm_util_get_buffer_size_len(be32_to_cpu(tpm_resp.len), - sizeof(uint32_t)); - error_report("tpm_util: Got unexpected response to " - "TPM_GetCapability; errcode: 0x%x", - be32_to_cpu(tpm_resp.hdr.errcode)); - return -EFAULT; - } - *buffersize = be32_to_cpu(tpm_resp.buffersize); - break; - } - case TPM_VERSION_2_0: { - const struct tpm2_req_get_buffer_size { - struct tpm_req_hdr hdr; - uint32_t capability; - uint32_t property; - uint32_t count; - } QEMU_PACKED tpm2_get_buffer_size = { - .hdr = { - .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS), - .len = cpu_to_be32(sizeof(tpm2_get_buffer_size)), - .ordinal = cpu_to_be32(TPM2_CC_GetCapability), - }, - .capability = cpu_to_be32(TPM2_CAP_TPM_PROPERTIES), - .property = cpu_to_be32(TPM2_PT_MAX_COMMAND_SIZE), - .count = cpu_to_be32(2), /* also get TPM2_PT_MAX_RESPONSE_SIZE */ - }; - struct tpm2_resp_get_buffer_size { - struct tpm_resp_hdr hdr; - uint8_t more; - uint32_t capability; - uint32_t count; - uint32_t property1; - uint32_t value1; - uint32_t property2; - uint32_t value2; - } QEMU_PACKED tpm2_resp; - - ret = tpm_util_request(tpm_fd, &tpm2_get_buffer_size, - sizeof(tpm2_get_buffer_size), - &tpm2_resp, sizeof(tpm2_resp)); - if (ret < 0) { - return ret; - } - - if (be32_to_cpu(tpm2_resp.hdr.len) != sizeof(tpm2_resp) || - be32_to_cpu(tpm2_resp.count) != 2) { - trace_tpm_util_get_buffer_size_hdr_len2( - be32_to_cpu(tpm2_resp.hdr.len), - sizeof(tpm2_resp)); - trace_tpm_util_get_buffer_size_len2( - be32_to_cpu(tpm2_resp.count), 2); - error_report("tpm_util: Got unexpected response to " - "TPM2_GetCapability; errcode: 0x%x", - be32_to_cpu(tpm2_resp.hdr.errcode)); - return -EFAULT; - } - *buffersize = MAX(be32_to_cpu(tpm2_resp.value1), - be32_to_cpu(tpm2_resp.value2)); - break; - } - case TPM_VERSION_UNSPEC: - return -EFAULT; - } - - trace_tpm_util_get_buffer_size(*buffersize); - - return 0; -} - -void tpm_sized_buffer_reset(TPMSizedBuffer *tsb) -{ - g_free(tsb->buffer); - tsb->buffer = NULL; - tsb->size = 0; -} - -void tpm_util_show_buffer(const unsigned char *buffer, - size_t buffer_size, const char *string) -{ - size_t len, i; - char *line_buffer, *p; - - len = MIN(tpm_cmd_get_size(buffer), buffer_size); - - /* - * allocate enough room for 3 chars per buffer entry plus a - * newline after every 16 chars and a final null terminator. - */ - line_buffer = g_malloc(len * 3 + (len / 16) + 1); - - for (i = 0, p = line_buffer; i < len; i++) { - if (i && !(i % 16)) { - p += sprintf(p, "\n"); - } - p += sprintf(p, "%.2X ", buffer[i]); - } - trace_tpm_util_show_buffer(string, len, line_buffer); - - g_free(line_buffer); -} |