pe.c revision 279315
1279315Strasz/*- 2279315Strasz * Copyright (c) 2014 The FreeBSD Foundation 3279315Strasz * All rights reserved. 4279315Strasz * 5279315Strasz * This software was developed by Edward Tomasz Napierala under sponsorship 6279315Strasz * from the FreeBSD Foundation. 7279315Strasz * 8279315Strasz * Redistribution and use in source and binary forms, with or without 9279315Strasz * modification, are permitted provided that the following conditions 10279315Strasz * are met: 11279315Strasz * 1. Redistributions of source code must retain the above copyright 12279315Strasz * notice, this list of conditions and the following disclaimer. 13279315Strasz * 2. Redistributions in binary form must reproduce the above copyright 14279315Strasz * notice, this list of conditions and the following disclaimer in the 15279315Strasz * documentation and/or other materials provided with the distribution. 16279315Strasz * 17279315Strasz * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18279315Strasz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19279315Strasz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20279315Strasz * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21279315Strasz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22279315Strasz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23279315Strasz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24279315Strasz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25279315Strasz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26279315Strasz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27279315Strasz * SUCH DAMAGE. 28279315Strasz * 29279315Strasz */ 30279315Strasz 31279315Strasz/* 32279315Strasz * PE format reference: 33279315Strasz * http://www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx 34279315Strasz */ 35279315Strasz 36279315Strasz#include <sys/cdefs.h> 37279315Strasz__FBSDID("$FreeBSD: head/usr.sbin/uefisign/pe.c 279315 2015-02-26 09:15:24Z trasz $"); 38279315Strasz 39279315Strasz#include <assert.h> 40279315Strasz#include <err.h> 41279315Strasz#include <errno.h> 42279315Strasz#include <stddef.h> 43279315Strasz#include <stdio.h> 44279315Strasz#include <stdint.h> 45279315Strasz#include <stdlib.h> 46279315Strasz#include <string.h> 47279315Strasz#include <unistd.h> 48279315Strasz 49279315Strasz#include "uefisign.h" 50279315Strasz 51279315Strasz#ifndef CTASSERT 52279315Strasz#define CTASSERT(x) _CTASSERT(x, __LINE__) 53279315Strasz#define _CTASSERT(x, y) __CTASSERT(x, y) 54279315Strasz#define __CTASSERT(x, y) typedef char __assert_ ## y [(x) ? 1 : -1] 55279315Strasz#endif 56279315Strasz 57279315Straszstruct mz_header { 58279315Strasz uint8_t mz_signature[2]; 59279315Strasz uint8_t mz_dont_care[58]; 60279315Strasz uint16_t mz_lfanew; 61279315Strasz} __attribute__((packed)); 62279315Strasz 63279315Straszstruct coff_header { 64279315Strasz uint8_t coff_dont_care[2]; 65279315Strasz uint16_t coff_number_of_sections; 66279315Strasz uint8_t coff_dont_care_either[16]; 67279315Strasz} __attribute__((packed)); 68279315Strasz 69279315Strasz#define PE_SIGNATURE 0x00004550 70279315Strasz 71279315Straszstruct pe_header { 72279315Strasz uint32_t pe_signature; 73279315Strasz struct coff_header pe_coff; 74279315Strasz} __attribute__((packed)); 75279315Strasz 76279315Strasz#define PE_OPTIONAL_MAGIC_32 0x010B 77279315Strasz#define PE_OPTIONAL_MAGIC_32_PLUS 0x020B 78279315Strasz 79279315Strasz#define PE_OPTIONAL_SUBSYSTEM_EFI_APPLICATION 10 80279315Strasz#define PE_OPTIONAL_SUBSYSTEM_EFI_BOOT 11 81279315Strasz#define PE_OPTIONAL_SUBSYSTEM_EFI_RUNTIME 12 82279315Strasz 83279315Straszstruct pe_optional_header_32 { 84279315Strasz uint16_t po_magic; 85279315Strasz uint8_t po_dont_care[58]; 86279315Strasz uint32_t po_size_of_headers; 87279315Strasz uint32_t po_checksum; 88279315Strasz uint16_t po_subsystem; 89279315Strasz uint8_t po_dont_care_either[22]; 90279315Strasz uint32_t po_number_of_rva_and_sizes; 91279315Strasz} __attribute__((packed)); 92279315Strasz 93279315StraszCTASSERT(offsetof(struct pe_optional_header_32, po_size_of_headers) == 60); 94279315StraszCTASSERT(offsetof(struct pe_optional_header_32, po_checksum) == 64); 95279315StraszCTASSERT(offsetof(struct pe_optional_header_32, po_subsystem) == 68); 96279315StraszCTASSERT(offsetof(struct pe_optional_header_32, po_number_of_rva_and_sizes) == 92); 97279315Strasz 98279315Straszstruct pe_optional_header_32_plus { 99279315Strasz uint16_t po_magic; 100279315Strasz uint8_t po_dont_care[58]; 101279315Strasz uint32_t po_size_of_headers; 102279315Strasz uint32_t po_checksum; 103279315Strasz uint16_t po_subsystem; 104279315Strasz uint8_t po_dont_care_either[38]; 105279315Strasz uint32_t po_number_of_rva_and_sizes; 106279315Strasz} __attribute__((packed)); 107279315Strasz 108279315StraszCTASSERT(offsetof(struct pe_optional_header_32_plus, po_size_of_headers) == 60); 109279315StraszCTASSERT(offsetof(struct pe_optional_header_32_plus, po_checksum) == 64); 110279315StraszCTASSERT(offsetof(struct pe_optional_header_32_plus, po_subsystem) == 68); 111279315StraszCTASSERT(offsetof(struct pe_optional_header_32_plus, po_number_of_rva_and_sizes) == 108); 112279315Strasz 113279315Strasz#define PE_DIRECTORY_ENTRY_CERTIFICATE 4 114279315Strasz 115279315Straszstruct pe_directory_entry { 116279315Strasz uint32_t pde_rva; 117279315Strasz uint32_t pde_size; 118279315Strasz} __attribute__((packed)); 119279315Strasz 120279315Straszstruct pe_section_header { 121279315Strasz uint8_t psh_dont_care[16]; 122279315Strasz uint32_t psh_size_of_raw_data; 123279315Strasz uint32_t psh_pointer_to_raw_data; 124279315Strasz uint8_t psh_dont_care_either[16]; 125279315Strasz} __attribute__((packed)); 126279315Strasz 127279315StraszCTASSERT(offsetof(struct pe_section_header, psh_size_of_raw_data) == 16); 128279315StraszCTASSERT(offsetof(struct pe_section_header, psh_pointer_to_raw_data) == 20); 129279315Strasz 130279315Strasz#define PE_CERTIFICATE_REVISION 0x0200 131279315Strasz#define PE_CERTIFICATE_TYPE 0x0002 132279315Strasz 133279315Straszstruct pe_certificate { 134279315Strasz uint32_t pc_len; 135279315Strasz uint16_t pc_revision; 136279315Strasz uint16_t pc_type; 137279315Strasz char pc_signature[0]; 138279315Strasz} __attribute__((packed)); 139279315Strasz 140279315Straszvoid 141279315Straszrange_check(const struct executable *x, off_t off, size_t len, 142279315Strasz const char *name) 143279315Strasz{ 144279315Strasz 145279315Strasz if (off < 0) { 146279315Strasz errx(1, "%s starts at negative offset %jd", 147279315Strasz name, (intmax_t)off); 148279315Strasz } 149279315Strasz if (off >= (off_t)x->x_len) { 150279315Strasz errx(1, "%s starts at %jd, past the end of executable at %zd", 151279315Strasz name, (intmax_t)off, x->x_len); 152279315Strasz } 153279315Strasz if (len >= x->x_len) { 154279315Strasz errx(1, "%s size %zd is larger than the executable size %zd", 155279315Strasz name, len, x->x_len); 156279315Strasz } 157279315Strasz if (off + len > x->x_len) { 158279315Strasz errx(1, "%s extends to %jd, past the end of executable at %zd", 159279315Strasz name, (intmax_t)(off + len), x->x_len); 160279315Strasz } 161279315Strasz} 162279315Strasz 163279315Straszsize_t 164279315Straszsignature_size(const struct executable *x) 165279315Strasz{ 166279315Strasz const struct pe_directory_entry *pde; 167279315Strasz 168279315Strasz range_check(x, x->x_certificate_entry_off, 169279315Strasz x->x_certificate_entry_len, "Certificate Directory"); 170279315Strasz 171279315Strasz pde = (struct pe_directory_entry *) 172279315Strasz (x->x_buf + x->x_certificate_entry_off); 173279315Strasz 174279315Strasz if (pde->pde_rva != 0 && pde->pde_size == 0) 175279315Strasz warnx("signature size is 0, but its RVA is %d", pde->pde_rva); 176279315Strasz if (pde->pde_rva == 0 && pde->pde_size != 0) 177279315Strasz warnx("signature RVA is 0, but its size is %d", pde->pde_size); 178279315Strasz 179279315Strasz return (pde->pde_size); 180279315Strasz} 181279315Strasz 182279315Straszvoid 183279315Straszshow_certificate(const struct executable *x) 184279315Strasz{ 185279315Strasz struct pe_certificate *pc; 186279315Strasz const struct pe_directory_entry *pde; 187279315Strasz 188279315Strasz range_check(x, x->x_certificate_entry_off, 189279315Strasz x->x_certificate_entry_len, "Certificate Directory"); 190279315Strasz 191279315Strasz pde = (struct pe_directory_entry *) 192279315Strasz (x->x_buf + x->x_certificate_entry_off); 193279315Strasz 194279315Strasz if (signature_size(x) == 0) { 195279315Strasz printf("file not signed\n"); 196279315Strasz return; 197279315Strasz } 198279315Strasz 199279315Strasz#if 0 200279315Strasz printf("certificate chunk at offset %zd, size %zd\n", 201279315Strasz pde->pde_rva, pde->pde_size); 202279315Strasz#endif 203279315Strasz 204279315Strasz range_check(x, pde->pde_rva, pde->pde_size, "Certificate chunk"); 205279315Strasz 206279315Strasz pc = (struct pe_certificate *)(x->x_buf + pde->pde_rva); 207279315Strasz if (pc->pc_revision != PE_CERTIFICATE_REVISION) { 208279315Strasz errx(1, "wrong certificate chunk revision, is %d, should be %d", 209279315Strasz pc->pc_revision, PE_CERTIFICATE_REVISION); 210279315Strasz } 211279315Strasz if (pc->pc_type != PE_CERTIFICATE_TYPE) { 212279315Strasz errx(1, "wrong certificate chunk type, is %d, should be %d", 213279315Strasz pc->pc_type, PE_CERTIFICATE_TYPE); 214279315Strasz } 215279315Strasz printf("to dump PKCS7:\n " 216279315Strasz "dd if='%s' bs=1 skip=%zd | openssl pkcs7 -inform DER -print\n", 217279315Strasz x->x_path, pde->pde_rva + offsetof(struct pe_certificate, pc_signature)); 218279315Strasz printf("to dump raw ASN.1:\n " 219279315Strasz "openssl asn1parse -i -inform DER -offset %zd -in '%s'\n", 220279315Strasz pde->pde_rva + offsetof(struct pe_certificate, pc_signature), x->x_path); 221279315Strasz} 222279315Strasz 223279315Straszstatic void 224279315Straszparse_section_table(struct executable *x, off_t off, int number_of_sections) 225279315Strasz{ 226279315Strasz const struct pe_section_header *psh; 227279315Strasz int i; 228279315Strasz 229279315Strasz range_check(x, off, sizeof(*psh) * number_of_sections, 230279315Strasz "section table"); 231279315Strasz 232279315Strasz if (x->x_headers_len <= off + sizeof(*psh) * number_of_sections) 233279315Strasz errx(1, "section table outside of headers"); 234279315Strasz 235279315Strasz psh = (const struct pe_section_header *)(x->x_buf + off); 236279315Strasz 237279315Strasz if (number_of_sections >= MAX_SECTIONS) { 238279315Strasz errx(1, "too many sections: got %d, should be %d", 239279315Strasz number_of_sections, MAX_SECTIONS); 240279315Strasz } 241279315Strasz x->x_nsections = number_of_sections; 242279315Strasz 243279315Strasz for (i = 0; i < number_of_sections; i++) { 244279315Strasz if (psh->psh_pointer_to_raw_data < x->x_headers_len) 245279315Strasz errx(1, "section points inside the headers"); 246279315Strasz 247279315Strasz range_check(x, psh->psh_pointer_to_raw_data, 248279315Strasz psh->psh_size_of_raw_data, "section"); 249279315Strasz#if 0 250279315Strasz printf("section %d: start %d, size %d\n", 251279315Strasz i, psh->psh_pointer_to_raw_data, psh->psh_size_of_raw_data); 252279315Strasz#endif 253279315Strasz x->x_section_off[i] = psh->psh_pointer_to_raw_data; 254279315Strasz x->x_section_len[i] = psh->psh_size_of_raw_data; 255279315Strasz psh++; 256279315Strasz } 257279315Strasz} 258279315Strasz 259279315Straszstatic void 260279315Straszparse_directory(struct executable *x, off_t off, 261279315Strasz int number_of_rva_and_sizes, int number_of_sections) 262279315Strasz{ 263279315Strasz //int i; 264279315Strasz const struct pe_directory_entry *pde; 265279315Strasz 266279315Strasz //printf("Data Directory at offset %zd\n", off); 267279315Strasz 268279315Strasz if (number_of_rva_and_sizes <= PE_DIRECTORY_ENTRY_CERTIFICATE) { 269279315Strasz errx(1, "wrong NumberOfRvaAndSizes %d; should be at least %d", 270279315Strasz number_of_rva_and_sizes, PE_DIRECTORY_ENTRY_CERTIFICATE); 271279315Strasz } 272279315Strasz 273279315Strasz range_check(x, off, sizeof(*pde) * number_of_rva_and_sizes, 274279315Strasz "PE Data Directory"); 275279315Strasz if (x->x_headers_len <= off + sizeof(*pde) * number_of_rva_and_sizes) 276279315Strasz errx(1, "PE Data Directory outside of headers"); 277279315Strasz 278279315Strasz x->x_certificate_entry_off = 279279315Strasz off + sizeof(*pde) * PE_DIRECTORY_ENTRY_CERTIFICATE; 280279315Strasz x->x_certificate_entry_len = sizeof(*pde); 281279315Strasz#if 0 282279315Strasz printf("certificate directory entry at offset %zd, len %zd\n", 283279315Strasz x->x_certificate_entry_off, x->x_certificate_entry_len); 284279315Strasz 285279315Strasz pde = (struct pe_directory_entry *)(x->x_buf + off); 286279315Strasz for (i = 0; i < number_of_rva_and_sizes; i++) { 287279315Strasz printf("rva %zd, size %zd\n", pde->pde_rva, pde->pde_size); 288279315Strasz pde++; 289279315Strasz } 290279315Strasz#endif 291279315Strasz 292279315Strasz return (parse_section_table(x, 293279315Strasz off + sizeof(*pde) * number_of_rva_and_sizes, number_of_sections)); 294279315Strasz} 295279315Strasz 296279315Strasz/* 297279315Strasz * The PE checksum algorithm is undocumented; this code is mostly based on 298279315Strasz * http://forum.sysinternals.com/optional-header-checksum-calculation_topic24214.html 299279315Strasz * 300279315Strasz * "Sum the entire image file, excluding the CheckSum field in the optional 301279315Strasz * header, as an array of USHORTs, allowing any carry above 16 bits to be added 302279315Strasz * back onto the low 16 bits. Then add the file size to get a 32-bit value." 303279315Strasz * 304279315Strasz * Note that most software does not care about the checksum at all; perhaps 305279315Strasz * we could just set it to 0 instead. 306279315Strasz * 307279315Strasz * XXX: Endianess? 308279315Strasz */ 309279315Straszstatic uint32_t 310279315Straszcompute_checksum(const struct executable *x) 311279315Strasz{ 312279315Strasz uint32_t cksum = 0; 313279315Strasz uint16_t tmp; 314279315Strasz int i; 315279315Strasz 316279315Strasz range_check(x, x->x_checksum_off, x->x_checksum_len, "PE checksum"); 317279315Strasz 318279315Strasz assert(x->x_checksum_off % 2 == 0); 319279315Strasz 320279315Strasz for (i = 0; i + sizeof(tmp) < x->x_len; i += 2) { 321279315Strasz /* 322279315Strasz * Don't checksum the checksum. The +2 is because the checksum 323279315Strasz * is 4 bytes, and here we're iterating over 2 byte chunks. 324279315Strasz */ 325279315Strasz if (i == x->x_checksum_off || i == x->x_checksum_off + 2) { 326279315Strasz tmp = 0; 327279315Strasz } else { 328279315Strasz assert(i + sizeof(tmp) <= x->x_len); 329279315Strasz memcpy(&tmp, x->x_buf + i, sizeof(tmp)); 330279315Strasz } 331279315Strasz 332279315Strasz cksum += tmp; 333279315Strasz cksum += cksum >> 16; 334279315Strasz cksum &= 0xffff; 335279315Strasz } 336279315Strasz 337279315Strasz cksum += cksum >> 16; 338279315Strasz cksum &= 0xffff; 339279315Strasz 340279315Strasz cksum += x->x_len; 341279315Strasz 342279315Strasz return (cksum); 343279315Strasz} 344279315Strasz 345279315Straszstatic void 346279315Straszparse_optional_32_plus(struct executable *x, off_t off, 347279315Strasz int number_of_sections) 348279315Strasz{ 349279315Strasz uint32_t computed_checksum; 350279315Strasz const struct pe_optional_header_32_plus *po; 351279315Strasz 352279315Strasz range_check(x, off, sizeof(*po), "PE Optional Header"); 353279315Strasz 354279315Strasz po = (struct pe_optional_header_32_plus *)(x->x_buf + off); 355279315Strasz switch (po->po_subsystem) { 356279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_APPLICATION: 357279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_BOOT: 358279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_RUNTIME: 359279315Strasz break; 360279315Strasz default: 361279315Strasz errx(1, "wrong PE Optional Header subsystem 0x%x", 362279315Strasz po->po_subsystem); 363279315Strasz } 364279315Strasz 365279315Strasz#if 0 366279315Strasz printf("subsystem %d, checksum 0x%x, %d data directories\n", 367279315Strasz po->po_subsystem, po->po_checksum, po->po_number_of_rva_and_sizes); 368279315Strasz#endif 369279315Strasz 370279315Strasz x->x_checksum_off = off + 371279315Strasz offsetof(struct pe_optional_header_32_plus, po_checksum); 372279315Strasz x->x_checksum_len = sizeof(po->po_checksum); 373279315Strasz#if 0 374279315Strasz printf("checksum 0x%x at offset %zd, len %zd\n", 375279315Strasz po->po_checksum, x->x_checksum_off, x->x_checksum_len); 376279315Strasz#endif 377279315Strasz 378279315Strasz computed_checksum = compute_checksum(x); 379279315Strasz if (computed_checksum != po->po_checksum) { 380279315Strasz warnx("invalid PE+ checksum; is 0x%x, should be 0x%x", 381279315Strasz po->po_checksum, computed_checksum); 382279315Strasz } 383279315Strasz 384279315Strasz if (x->x_len < x->x_headers_len) 385279315Strasz errx(1, "invalid SizeOfHeaders %d", po->po_size_of_headers); 386279315Strasz x->x_headers_len = po->po_size_of_headers; 387279315Strasz //printf("Size of Headers: %d\n", po->po_size_of_headers); 388279315Strasz 389279315Strasz return (parse_directory(x, off + sizeof(*po), 390279315Strasz po->po_number_of_rva_and_sizes, number_of_sections)); 391279315Strasz} 392279315Strasz 393279315Straszstatic void 394279315Straszparse_optional_32(struct executable *x, off_t off, int number_of_sections) 395279315Strasz{ 396279315Strasz uint32_t computed_checksum; 397279315Strasz const struct pe_optional_header_32 *po; 398279315Strasz 399279315Strasz range_check(x, off, sizeof(*po), "PE Optional Header"); 400279315Strasz 401279315Strasz po = (struct pe_optional_header_32 *)(x->x_buf + off); 402279315Strasz switch (po->po_subsystem) { 403279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_APPLICATION: 404279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_BOOT: 405279315Strasz case PE_OPTIONAL_SUBSYSTEM_EFI_RUNTIME: 406279315Strasz break; 407279315Strasz default: 408279315Strasz errx(1, "wrong PE Optional Header subsystem 0x%x", 409279315Strasz po->po_subsystem); 410279315Strasz } 411279315Strasz 412279315Strasz#if 0 413279315Strasz printf("subsystem %d, checksum 0x%x, %d data directories\n", 414279315Strasz po->po_subsystem, po->po_checksum, po->po_number_of_rva_and_sizes); 415279315Strasz#endif 416279315Strasz 417279315Strasz x->x_checksum_off = off + 418279315Strasz offsetof(struct pe_optional_header_32, po_checksum); 419279315Strasz x->x_checksum_len = sizeof(po->po_checksum); 420279315Strasz#if 0 421279315Strasz printf("checksum at offset %zd, len %zd\n", 422279315Strasz x->x_checksum_off, x->x_checksum_len); 423279315Strasz#endif 424279315Strasz 425279315Strasz computed_checksum = compute_checksum(x); 426279315Strasz if (computed_checksum != po->po_checksum) { 427279315Strasz warnx("invalid PE checksum; is 0x%x, should be 0x%x", 428279315Strasz po->po_checksum, computed_checksum); 429279315Strasz } 430279315Strasz 431279315Strasz if (x->x_len < x->x_headers_len) 432279315Strasz errx(1, "invalid SizeOfHeaders %d", po->po_size_of_headers); 433279315Strasz x->x_headers_len = po->po_size_of_headers; 434279315Strasz //printf("Size of Headers: %d\n", po->po_size_of_headers); 435279315Strasz 436279315Strasz return (parse_directory(x, off + sizeof(*po), 437279315Strasz po->po_number_of_rva_and_sizes, number_of_sections)); 438279315Strasz} 439279315Strasz 440279315Straszstatic void 441279315Straszparse_optional(struct executable *x, off_t off, int number_of_sections) 442279315Strasz{ 443279315Strasz const struct pe_optional_header_32 *po; 444279315Strasz 445279315Strasz //printf("Optional header offset %zd\n", off); 446279315Strasz 447279315Strasz range_check(x, off, sizeof(*po), "PE Optional Header"); 448279315Strasz 449279315Strasz po = (struct pe_optional_header_32 *)(x->x_buf + off); 450279315Strasz 451279315Strasz switch (po->po_magic) { 452279315Strasz case PE_OPTIONAL_MAGIC_32: 453279315Strasz return (parse_optional_32(x, off, number_of_sections)); 454279315Strasz case PE_OPTIONAL_MAGIC_32_PLUS: 455279315Strasz return (parse_optional_32_plus(x, off, number_of_sections)); 456279315Strasz default: 457279315Strasz errx(1, "wrong PE Optional Header magic 0x%x", po->po_magic); 458279315Strasz } 459279315Strasz} 460279315Strasz 461279315Straszstatic void 462279315Straszparse_pe(struct executable *x, off_t off) 463279315Strasz{ 464279315Strasz const struct pe_header *pe; 465279315Strasz 466279315Strasz //printf("PE offset %zd, PE size %zd\n", off, sizeof(*pe)); 467279315Strasz 468279315Strasz range_check(x, off, sizeof(*pe), "PE header"); 469279315Strasz 470279315Strasz pe = (struct pe_header *)(x->x_buf + off); 471279315Strasz if (pe->pe_signature != PE_SIGNATURE) 472279315Strasz errx(1, "wrong PE signature 0x%x", pe->pe_signature); 473279315Strasz 474279315Strasz //printf("Number of sections: %d\n", pe->pe_coff.coff_number_of_sections); 475279315Strasz 476279315Strasz parse_optional(x, off + sizeof(*pe), 477279315Strasz pe->pe_coff.coff_number_of_sections); 478279315Strasz} 479279315Strasz 480279315Straszvoid 481279315Straszparse(struct executable *x) 482279315Strasz{ 483279315Strasz const struct mz_header *mz; 484279315Strasz 485279315Strasz range_check(x, 0, sizeof(*mz), "MZ header"); 486279315Strasz 487279315Strasz mz = (struct mz_header *)x->x_buf; 488279315Strasz if (mz->mz_signature[0] != 'M' || mz->mz_signature[1] != 'Z') 489279315Strasz errx(1, "MZ header not found"); 490279315Strasz 491279315Strasz return (parse_pe(x, mz->mz_lfanew)); 492279315Strasz} 493279315Strasz 494279315Straszstatic off_t 495279315Straszappend(struct executable *x, void *ptr, size_t len) 496279315Strasz{ 497279315Strasz off_t off; 498279315Strasz 499279315Strasz /* 500279315Strasz * XXX: Alignment. 501279315Strasz */ 502279315Strasz off = x->x_len; 503279315Strasz x->x_buf = realloc(x->x_buf, x->x_len + len); 504279315Strasz if (x->x_buf == NULL) 505279315Strasz err(1, "realloc"); 506279315Strasz memcpy(x->x_buf + x->x_len, ptr, len); 507279315Strasz x->x_len += len; 508279315Strasz 509279315Strasz return (off); 510279315Strasz} 511279315Strasz 512279315Straszvoid 513279315Straszupdate(struct executable *x) 514279315Strasz{ 515279315Strasz uint32_t checksum; 516279315Strasz struct pe_certificate *pc; 517279315Strasz struct pe_directory_entry pde; 518279315Strasz size_t pc_len; 519279315Strasz off_t pc_off; 520279315Strasz 521279315Strasz pc_len = sizeof(*pc) + x->x_signature_len; 522279315Strasz pc = calloc(1, pc_len); 523279315Strasz if (pc == NULL) 524279315Strasz err(1, "calloc"); 525279315Strasz 526279315Strasz#if 0 527279315Strasz /* 528279315Strasz * Note that pc_len is the length of pc_certificate, 529279315Strasz * not the whole structure. 530279315Strasz * 531279315Strasz * XXX: That's what the spec says - but it breaks at least 532279315Strasz * sbverify and "pesign -S", so the spec is probably wrong. 533279315Strasz */ 534279315Strasz pc->pc_len = x->x_signature_len; 535279315Strasz#else 536279315Strasz pc->pc_len = pc_len; 537279315Strasz#endif 538279315Strasz pc->pc_revision = PE_CERTIFICATE_REVISION; 539279315Strasz pc->pc_type = PE_CERTIFICATE_TYPE; 540279315Strasz memcpy(&pc->pc_signature, x->x_signature, x->x_signature_len); 541279315Strasz 542279315Strasz pc_off = append(x, pc, pc_len); 543279315Strasz#if 0 544279315Strasz printf("added signature chunk at offset %zd, len %zd\n", 545279315Strasz pc_off, pc_len); 546279315Strasz#endif 547279315Strasz 548279315Strasz free(pc); 549279315Strasz 550279315Strasz pde.pde_rva = pc_off; 551279315Strasz pde.pde_size = pc_len; 552279315Strasz memcpy(x->x_buf + x->x_certificate_entry_off, &pde, sizeof(pde)); 553279315Strasz 554279315Strasz checksum = compute_checksum(x); 555279315Strasz assert(sizeof(checksum) == x->x_checksum_len); 556279315Strasz memcpy(x->x_buf + x->x_checksum_off, &checksum, sizeof(checksum)); 557279315Strasz#if 0 558279315Strasz printf("new checksum 0x%x\n", checksum); 559279315Strasz#endif 560279315Strasz} 561