1 /* 2 * Copyright (c) 2009-2013, Google Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google, Inc. nor the names of its contributors 15 * may be used to endorse or promote products derived from this 16 * software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/stat.h> 33 #include <fcntl.h> 34 #include <inttypes.h> 35 #include <sys/mman.h> 36 37 #include "flash.h" 38 #include "protocol.h" 39 #include "debug.h" 40 #include "utils.h" 41 #include "commands/partitions.h" 42 43 #ifdef FLASH_CERT 44 #include "secure.h" 45 #endif 46 47 #define ALLOWED_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-." 48 #define BUFFER_SIZE 1024 * 1024 49 #define MIN(a, b) (a > b ? b : a) 50 51 52 int flash_find_entry(const char *name, char *out, size_t outlen) 53 { 54 //TODO: Assumption: All the partitions has they unique name 55 56 const char *path = fastboot_getvar("device-directory"); 57 size_t length; 58 if (strcmp(path, "") == 0) { 59 D(ERR, "device-directory: not defined in config file"); 60 return -1; 61 } 62 63 length = strspn(name, ALLOWED_CHARS); 64 if (length != strlen(name)) { 65 D(ERR, "Not allowed char in name: %c", name[length]); 66 return -1; 67 } 68 69 if (snprintf(out, outlen, "%s%s", path, name) >= (int) outlen) { 70 D(ERR, "Too long path to partition file"); 71 return -1; 72 } 73 74 if (access(out, F_OK ) == -1) { 75 D(ERR, "could not find partition file %s", name); 76 return -1; 77 } 78 79 return 0; 80 } 81 82 int flash_erase(int fd) 83 { 84 int64_t size; 85 size = get_block_device_size(fd); 86 D(DEBUG, "erase %"PRId64" data from %d\n", size, fd); 87 88 return wipe_block_device(fd, size); 89 } 90 91 int flash_write(int partition_fd, int data_fd, ssize_t size, ssize_t skip) 92 { 93 ssize_t written = 0; 94 struct GPT_mapping input; 95 struct GPT_mapping output; 96 97 while (written < size) { 98 int current_size = MIN(size - written, BUFFER_SIZE); 99 100 if (gpt_mmap(&input, written + skip, current_size, data_fd)) { 101 D(ERR, "Error in writing data, unable to map data file %zd at %zd size %d", size, skip, current_size); 102 return -1; 103 } 104 if (gpt_mmap(&output, written, current_size, partition_fd)) { 105 D(ERR, "Error in writing data, unable to map output partition"); 106 return -1; 107 } 108 109 memcpy(output.ptr, input.ptr, current_size); 110 111 gpt_unmap(&input); 112 gpt_unmap(&output); 113 114 written += current_size; 115 } 116 117 return 0; 118 } 119 120 #ifdef FLASH_CERT 121 122 int flash_validate_certificate(int signed_fd, int *data_fd) { 123 int ret = 0; 124 const char *cert_path; 125 X509_STORE *store = NULL; 126 CMS_ContentInfo *content_info; 127 BIO *content; 128 129 cert_path = fastboot_getvar("certificate-path"); 130 if (!strcmp(cert_path, "")) { 131 D(ERR, "could not find cert-key value in config file"); 132 goto finish; 133 } 134 135 store = cert_store_from_path(cert_path); 136 if (store == NULL) { 137 D(ERR, "unable to create certification store"); 138 goto finish; 139 } 140 141 if (cert_read(signed_fd, &content_info, &content)) { 142 D(ERR, "reading data failed"); 143 goto finish; 144 } 145 146 ret = cert_verify(content, content_info, store, data_fd); 147 cert_release(content, content_info); 148 149 return ret; 150 151 finish: 152 if (store != NULL) 153 cert_release_store(store); 154 155 return ret; 156 } 157 158 #else 159 int flash_validate_certificate(int signed_fd, int *data_fd) { 160 return 1; 161 } 162 #endif 163