├── .gitignore ├── LICENSE ├── README.md ├── bin ├── jq-linux64 └── jq-osx-amd64 ├── run.sh └── snet-bin-parser.c /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | snet-1* 3 | snet-bin-parser 4 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Anestis Bechtsoudis 190 | Copyright 2017 by CENSUS S.A. All Rights Reserved. 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Snet-Extractor 2 | 3 | Command line tool to download and extract the latest version of the Google Play Services SafetyNet 4 | Jar file. 5 | 6 | To use simply execute the `run.sh` script and the latest version of the bytecode will be downloaded 7 | in the current directory, along with all the metadata. 8 | 9 | ```bash 10 | $ ./run.sh 11 | [*] Downloading SNET flags file 12 | ######################################################################## 100.0% 13 | [*] Successfully extracted 'metadata_flags.txt' 14 | [*] Successfully extracted 'payload.snet' 15 | [*] Detected snet version '10001000' 16 | [*] Downloading SNET Jar file 17 | ######################################################################## 100.0% 18 | [*] Successfully extracted 'metadata_flags.txt' 19 | [*] Successfully extracted 'payload.snet' 20 | [*] All files successfully extract at 'snet-10001000' 21 | 22 | $ tree snet-10001000/ 23 | snet-10001000/ 24 | ├── 03242017-10001000.snet 25 | ├── metadata_flags.txt 26 | ├── snet.flags 27 | ├── snet.jar 28 | └── snet_flags.json 29 | 30 | 0 directories, 5 files 31 | ``` 32 | 33 | 34 | ## License 35 | 36 | ``` 37 | Anestis Bechtsoudis 38 | Copyright 2017 by CENSUS S.A. All Rights Reserved. 39 | 40 | Licensed under the Apache License, Version 2.0 (the "License"); 41 | you may not use this file except in compliance with the License. 42 | You may obtain a copy of the License at 43 | 44 | http://www.apache.org/licenses/LICENSE-2.0 45 | 46 | Unless required by applicable law or agreed to in writing, software 47 | distributed under the License is distributed on an "AS IS" BASIS, 48 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 49 | See the License for the specific language governing permissions and 50 | limitations under the License. 51 | ``` 52 | -------------------------------------------------------------------------------- /bin/jq-linux64: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/anestisb/snet-extractor/30636675211ae7fe9abb9e98f9d5584c733c736a/bin/jq-linux64 -------------------------------------------------------------------------------- /bin/jq-osx-amd64: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/anestisb/snet-extractor/30636675211ae7fe9abb9e98f9d5584c733c736a/bin/jq-osx-amd64 -------------------------------------------------------------------------------- /run.sh: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | # 3 | # snet-extractor 4 | # ----------------------------------------- 5 | # 6 | # Anestis Bechtsoudis 7 | # Copyright 2017 by CENSUS S.A. All Rights Reserved. 8 | # 9 | # Licensed under the Apache License, Version 2.0 (the "License"); 10 | # you may not use this file except in compliance with the License. 11 | # You may obtain a copy of the License at 12 | # 13 | # http://www.apache.org/licenses/LICENSE-2.0 14 | # 15 | # Unless required by applicable law or agreed to in writing, software 16 | # distributed under the License is distributed on an "AS IS" BASIS, 17 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 | # See the License for the specific language governing permissions and 19 | # limitations under the License. 20 | # 21 | 22 | set -e # fail on unhandled error 23 | set -u # fail on undefined variable 24 | #set -x # debug 25 | 26 | readonly SNET_FLAGS="https://www.gstatic.com/android/snet/snet.flags" 27 | readonly TMP_WORK_DIR=$(mktemp -d /tmp/snet-extractor.XXXXXX) || exit 1 28 | readonly TOOL_ROOT="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" 29 | 30 | # JSON beautifier (https://stedolan.github.io/jq/) 31 | readonly JBEA_MAC="$TOOL_ROOT/bin/jq-osx-amd64" 32 | readonly JBEA_LINUX="$TOOL_ROOT/bin/jq-linux64" 33 | 34 | readonly kMetadataFile="metadata_flags.txt" 35 | readonly kPayloadFile="payload.snet" 36 | 37 | readonly FLAGS_FILE="snet_flags.json" 38 | readonly JAR_FILE="snet.jar" 39 | 40 | abort() { 41 | # If debug enabled, keep work directory for further investigation 42 | if [[ "$-" == *x* ]]; then 43 | echo "[!] Workspace available at '$TMP_WORK_DIR' - delete manually when done" 44 | else 45 | rm -rf "$TMP_WORK_DIR" 46 | fi 47 | exit "$1" 48 | } 49 | 50 | isMacOS() { 51 | if [[ "$(uname -s)" == "Darwin" ]]; then 52 | return 0 53 | fi 54 | return 1 55 | } 56 | 57 | # Main 58 | trap "abort 1" SIGHUP SIGINT SIGTERM 59 | 60 | if isMacOS; then 61 | JBEA="$JBEA_MAC" 62 | else 63 | JBEA="$JBEA_LINUX" 64 | fi 65 | 66 | echo "[*] Downloading SNET flags file" 67 | curl "$SNET_FLAGS" --output "$TMP_WORK_DIR/snet.flags" || { 68 | echo "[-] Failed to download snet flags data" 69 | abort 1 70 | } 71 | 72 | gcc -Wall -Wextra -Werror -o "$TOOL_ROOT/snet-bin-parser" "$TOOL_ROOT/snet-bin-parser.c" || { 73 | echo "[-] Failed to compile snet binary parser tool" 74 | abort 1 75 | } 76 | 77 | "$TOOL_ROOT/snet-bin-parser" "$TMP_WORK_DIR/snet.flags" "$TMP_WORK_DIR" || { 78 | echo "[-] Failed to parse snet.flags" 79 | abort 1 80 | } 81 | 82 | version=$(grep "^VERSION:" "$TMP_WORK_DIR/$kMetadataFile" | cut -d ":" -f2) 83 | echo "[*] Detected snet version '$version'" 84 | 85 | outputDir="snet-$version" 86 | mkdir -p "$outputDir" 87 | cp "$TMP_WORK_DIR/$kPayloadFile" "$outputDir/$FLAGS_FILE" 88 | cp "$TMP_WORK_DIR/$kMetadataFile" "$outputDir" 89 | cp "$TMP_WORK_DIR/snet.flags" "$outputDir" 90 | 91 | downloadUrl=$($JBEA .url "$outputDir/$FLAGS_FILE" | tr -d '"') 92 | fileName="${downloadUrl##*/}" 93 | 94 | echo "[*] Downloading SNET Jar file" 95 | curl "$downloadUrl" --output "$outputDir/$fileName" || { 96 | echo "[-] Failed to download snet jar data" 97 | abort 1 98 | } 99 | 100 | "$TOOL_ROOT/snet-bin-parser" "$outputDir/$fileName" "$TMP_WORK_DIR" || { 101 | echo "[-] Failed to parse $fileName" 102 | abort 1 103 | } 104 | cp "$TMP_WORK_DIR/$kPayloadFile" "$outputDir/$JAR_FILE" 105 | 106 | echo "[*] All files successfully extract at '$outputDir'" 107 | abort 0 108 | -------------------------------------------------------------------------------- /snet-bin-parser.c: -------------------------------------------------------------------------------- 1 | /* 2 | 3 | snet-extractor 4 | ----------------------------------------- 5 | 6 | Anestis Bechtsoudis 7 | Copyright 2017 by CENSUS S.A. All Rights Reserved. 8 | 9 | Licensed under the Apache License, Version 2.0 (the "License"); 10 | you may not use this file except in compliance with the License. 11 | You may obtain a copy of the License at 12 | 13 | http://www.apache.org/licenses/LICENSE-2.0 14 | 15 | Unless required by applicable law or agreed to in writing, software 16 | distributed under the License is distributed on an "AS IS" BASIS, 17 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 | See the License for the specific language governing permissions and 19 | limitations under the License. 20 | 21 | */ 22 | 23 | #include 24 | #include 25 | #include 26 | #include 27 | #include 28 | #include 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include 34 | 35 | static char *kMetadataFile = "metadata_flags.txt"; 36 | static char *kPayloadFile = "payload.snet"; 37 | 38 | static uint8_t *mapFile(char *fileName, off_t *fileSz, int *fd, bool enableWrite) { 39 | if ((*fd = open(fileName, enableWrite ? O_RDWR : O_RDONLY)) == -1) { 40 | printf("[-] Couldn't open() '%s' file in R/O mode (%s)", fileName, strerror(errno)); 41 | return NULL; 42 | } 43 | 44 | struct stat st; 45 | if (fstat(*fd, &st) == -1) { 46 | printf("[-] Couldn't stat() the '%s' file (%s)", fileName, strerror(errno)); 47 | close(*fd); 48 | return NULL; 49 | } 50 | 51 | uint8_t *buf; 52 | int flags = PROT_READ; 53 | if (enableWrite) { 54 | flags |= PROT_WRITE; 55 | } 56 | if ((buf = mmap(NULL, st.st_size, flags, MAP_PRIVATE, *fd, 0)) == MAP_FAILED) { 57 | printf("[-] Couldn't mmap() the '%s' file (%s)\n", fileName, strerror(errno)); 58 | close(*fd); 59 | return NULL; 60 | } 61 | 62 | *fileSz = st.st_size; 63 | return buf; 64 | } 65 | 66 | static bool writeToFd(int fd, const uint8_t * buf, size_t fileSz) { 67 | size_t writtenSz = 0; 68 | while (writtenSz < fileSz) { 69 | ssize_t sz = write(fd, &buf[writtenSz], fileSz - writtenSz); 70 | if (sz < 0 && errno == EINTR) 71 | continue; 72 | 73 | if (sz < 0) 74 | return false; 75 | 76 | writtenSz += sz; 77 | } 78 | return true; 79 | } 80 | 81 | static bool writeBufToFile(const char *fileName, const uint8_t * buf, size_t fileSz) { 82 | int fd = open(fileName, O_CREAT | O_WRONLY, 0644); 83 | if (fd == -1) { 84 | printf("[-] Couldn't open '%s' for write (%s)\n", fileName, strerror(errno)); 85 | return false; 86 | } 87 | 88 | if (writeToFd(fd, buf, fileSz) == false) { 89 | printf("[-] Couldn't write '%zu' bytes to file '%s' (fd='%d') (%s)\n", 90 | fileSz, fileName, fd, strerror(errno)); 91 | unlink(fileName); 92 | close(fd); 93 | return false; 94 | } 95 | 96 | return true; 97 | } 98 | 99 | uint32_t read4Bytes(uint8_t *cursor) { 100 | uint32_t x; 101 | x = 0xFF & cursor[3]; 102 | x |= (0xFF & cursor[2]) << 8; 103 | x |= (0xFF & cursor[1]) << 16; 104 | x |= (uint32_t)(0xFF & cursor[0]) << 24; 105 | return x; 106 | } 107 | 108 | int main(int argc, char **argv) { 109 | int ret = EXIT_FAILURE; 110 | 111 | if (argc != 3) { 112 | printf("%s \n", argv[0]); 113 | return ret; 114 | } 115 | 116 | off_t fileSz = 0; 117 | int srcfd = -1; 118 | uint8_t *buf = NULL; 119 | 120 | buf = mapFile(argv[1], &fileSz, &srcfd, false); 121 | if (buf == NULL) { 122 | printf("[-] Open & map failed\n"); 123 | return ret; 124 | } 125 | 126 | uint32_t sigBlobSize = read4Bytes(buf); 127 | 128 | char outputFile[PATH_MAX] = { 0 }; 129 | snprintf(outputFile, sizeof(outputFile), "%s/%s", argv[2], kMetadataFile); 130 | if (!writeBufToFile(outputFile, buf + 4, sigBlobSize)) { 131 | printf("[-] Failed to write snet metadata file"); 132 | goto fini; 133 | } 134 | printf("[*] Successfully extracted '%s'\n", kMetadataFile); 135 | 136 | memset(outputFile, 0, sizeof(outputFile)); 137 | snprintf(outputFile, sizeof(outputFile), "%s/%s", argv[2], kPayloadFile); 138 | if (!writeBufToFile(outputFile, buf + 4 + sigBlobSize, fileSz - 4 - sigBlobSize)) { 139 | printf("[-] Failed to write snet flags file"); 140 | goto fini; 141 | } 142 | printf("[*] Successfully extracted '%s'\n", kPayloadFile); 143 | 144 | ret = EXIT_SUCCESS; 145 | 146 | fini: 147 | close(srcfd); 148 | 149 | return ret; 150 | } 151 | --------------------------------------------------------------------------------