X-Git-Url: https://iam.tj/gitweb/gitweb.cgi?p=cfe_generate_password.git;a=blobdiff_plain;f=cfe_generate_password.c;h=f806b2c908eb3fdb93123a8950de8f14b66d9179;hp=8746cd1e5f98bd19cdd8c0f0f107b1850d812038;hb=90e959b83814234b2f38ec612e90c4c51c994b62;hpb=4d52cf071f1865a44f4ae8ad3cd9e58cef7a9dd7 diff --git a/cfe_generate_password.c b/cfe_generate_password.c index 8746cd1..f806b2c 100644 --- a/cfe_generate_password.c +++ b/cfe_generate_password.c @@ -1,84 +1,93 @@ -/* - Generate Broadcom CFE seeds and passwords for many popular modem/router devices +static const char *title = \ +"Generate Broadcom CFE seeds and passwords for many popular modem/router devices\n" +; +static const float VERSION = 1.3f; - Copyright 2015 TJ - Licenced on the terms of the GNU General Public Licence version 3 +static const char *copyright = \ +"Copyright 2015 TJ \n" +"Licenced on the terms of the GNU General Public Licence version 3\n" +; - To build: +static const char *help = \ +"This tool can generate passwords for use with many devices that contain Broadcom Common Firmware Environment (CFE) bootbase which has a debug mode that is enabled using the 'ATEN 1 XXXXXXXX' command, where XXXXXXXX is an eight digit hexadecimal 'password'.\n\n" - gcc -o cfe_gen_pass cfe_generate_password.c +"It is NOT necessary to have the device generate a 'seed' using 'ATSE [MODEL-ID]' because this tool can generate the seed from the device's first (base) MAC address.\n\n" - Or: +"When the device generates a seed it combines the number of seconds since 1970-01-01 00:00:00 with the router MAC address. Both are encoded in a single 6-byte hexadecimal number\n\n" - make +"Each value is truncated to its 3 least significant bytes so, for example:\n\n" - To use: +" $ date +%F.%T; echo \"obase=16;$(date +%s)\" | bc\n" +" 2016-03-26.23:06:32\n" +" 56F715F8\n\n" - ./cfe_gen_pass [options] +"and MAC Address: EC:43:F6:46:C0:80\n\n" - This tool can generate passwords for use with many devices that contain - Broadcom Common Firmware Environment (CFE) bootbase which has a debug mode - that is enabled using the "ATEN 1 XXXXXXXX" command, where XXXXXXXX is an - eight digit hexadecimal 'password'. +"becomes F715F8 concatenated with 46C080\n\n" - It is NOT necessary to have the device generate a 'seed' using "ATSE [MODEL-ID]" - because this tool can generate the seed from the device's first (base) MAC address - *provided* the "ATSE" command has NOT been executed since the device last booted. +" CFE> ATSE DSL-2492GNAU-B1BC\n" +" F715F846C080 <<<< last 3 bytes of MAC address\n" +" ^^^^^^\n" +" seconds since 1970-01-01 00:00:00 (2016-03-26 23:06:32)\n\n" - Access to the device's console via a serial UART port is required to enter the password. +"*NOTE: the default seed after power-up is 000000 so no time value needs to be specifed if 'ATSE ' has not been executed on the device.\n\n" - So, for a device with base MAC address (reported by the CFE during boot) E.g: +"Access to the device's console via a serial UART port, or a network telnet/ssh session, is required to enter the password.\n\n" - CFE version 1.0.38-112.118 for BCM963268 (32bit,SP,BE) - ... - Base MAC Address : ec:43:f6:46:c0:80 - ... - *** Press any key to stop auto run (1 seconds) *** - CFE> +"So, for a device with base MAC address (reported by the CFE during boot) E.g:\n\n" - Using this tool do: +" CFE version 1.0.38-112.118 for BCM963268 (32bit,SP,BE)\n" +" ...\n" +" Base MAC Address : ec:43:f6:46:c0:80\n" +" ...\n" +" *** Press any key to stop auto run (1 seconds) ***\n" +" CFE>\n\n" - ./cfe_gen_pass -s ec:43:f6:46:c0:80 -p +"Using this tool do:\n\n" - MAC address: ec:43:f6:46:c0:80 Timestamp: 000000 Seed: 00000046c080 Password: 10f0a563 +" ./cfe_gen_pass -s ec:43:f6:46:c0:80 -p\n\n" - And on the device do: +" MAC address: ec:43:f6:46:c0:80 Timestamp: 000000 Seed: 00000046c080 Password: 10f0a563\n\n" - CFE> ATEN 1 10f0a563 - OK - *** command status = 0 +"And on the device do:\n\n" - The tool can accept a timestamp as 6 hexadecimal characters (useful for testing the algorithm): +" CFE> ATEN 1 10f0a563\n" +" OK\n" +" *** command status = 0\n\n" - ./cfe_gen_pass -t 0FF020 -s ec:43:f6:46:c0:80 -p +"The tool can accept a timestamp as 8 hexadecimal characters (useful for testing the algorithm):\n\n" - MAC address: ec:43:f6:46:c0:80 Timestamp: 0FF020 Seed: 0FF02046c080 Password: 110f65a3 - */ +" ./cfe_gen_pass -t 0FF020 -s ec:43:f6:46:c0:80 -p\n\n" + +"MAC address: ec:43:f6:46:c0:80 Timestamp: 0FF020 Seed: 0FF02046c080 Password: 110f65a3\n\n" +; #include #include #include #include +#include -static const float VERSION = 1.1f; -static const size_t TIMESTAMP_SIZE = 6; +static const size_t TIMESTAMP_SIZE = 8; static const size_t SEED_SIZE = 12; static const size_t PASSWORD_SIZE = 8; static const size_t MESSAGE_SIZE = 128; static const size_t MAC_ADDR_SIZE = 17; +static const size_t DATESTRING_SIZE = 20; static void -pr_usage() +pr_usage(int verbose) { - fprintf(stderr, "%s\n", + fprintf(stderr, "Usage:\n" " -v show version\n" " -s 00:01:02:03:04:05 create seed from MAC address\n" - " -t 000000 millisecond timestamp since boot\n" - " -p [SEED] generate password (with optional seed)\n\n" - " E.g. -s 01:02:03:04:05 \n" - " -s 01:02:03:04:05 -p\n" - " -p 000000030405\n" + " -t [00000000] seconds since 1970-01-01 (defaults to NOW) \n" + " -p [SEED] generate password (with optional seed)\n" + " -h show additional help\n" + "\n" + "%s", + verbose ? help : "" ); } @@ -86,16 +95,16 @@ static void pr_error_exit(unsigned int usage, const char *error, ...) { va_list args; - char error_message[MESSAGE_SIZE]; + char error_message[MESSAGE_SIZE + 1]; if (!error) return; va_start(args, error); - (void) vsnprintf(error_message, MESSAGE_SIZE, error, args); + (void) vsnprintf(error_message, MESSAGE_SIZE + 1, error, args); va_end(args); fprintf(stderr, "Error: %s\n", error_message); - if (usage) pr_usage(); + if (usage) pr_usage(usage); exit(EXIT_FAILURE); } @@ -119,19 +128,21 @@ generate_seed(char *mac, char *timestamp, char *seed) size_t i; char *mac_ptr = mac + 9; size_t ts_len = strlen(timestamp); - for (i = 0; i <= SEED_SIZE; ++i) { - /* if no timestamp assume CFE get_time() returned 0 and CFE g_pw_timestamp == 0x00000000 */ - if (i < 6) - seed[i] = ts_len ? timestamp[i] : '0'; - else { - if (*mac_ptr == ':' || *mac_ptr == '-') - ++mac_ptr; - seed[i] = *mac_ptr++; + if (ts_len == TIMESTAMP_SIZE) { + for (i = 0; i < SEED_SIZE; ++i) { + if (i < 6) // first half of seed is the truncated timestamp + seed[i] = timestamp[i+2]; + else { // second half is the truncated MAC address + if (*mac_ptr == ':' || *mac_ptr == '-') + ++mac_ptr; + seed[i] = *mac_ptr++; + } } - } - result = 1; + result = 1; + } else + pr_error_exit(0, "Timestamp ('%s') should be %d hexadecimal characters e.g: 56F715F8", timestamp, TIMESTAMP_SIZE); } else - pr_error_exit(0, "MAC-ADDR should be 17 characters, e.g: 00:01:02:03:04:05"); + pr_error_exit(0, "MAC-ADDR should be %d characters, e.g: 00:01:02:03:04:05", MAC_ADDR_SIZE); return result; } @@ -164,7 +175,7 @@ main(int argc, char **argv, char **env) int result = 0; if (argc == 1) { - pr_usage(); + pr_usage(0); } else { unsigned int arg; @@ -172,11 +183,14 @@ main(int argc, char **argv, char **env) char timestamp[TIMESTAMP_SIZE + 1]; char seed[SEED_SIZE + 1]; char password[PASSWORD_SIZE + 1]; + char date_string[DATESTRING_SIZE + 1]; unsigned int opt_seed, opt_pass, opt_ts; - seed[0] = password[0] = 0; - seed[SEED_SIZE] = password[PASSWORD_SIZE] = timestamp[TIMESTAMP_SIZE] = 0; + time_t ts = 0; + struct tm *t = NULL; + seed[0] = password[0] = timestamp[0] = 0; + seed[SEED_SIZE] = password[PASSWORD_SIZE] = 0; opt_seed = opt_pass = opt_ts = 0; - strncpy(timestamp, "000000", TIMESTAMP_SIZE); + strncpy(timestamp, "00000000", TIMESTAMP_SIZE + 1); for (arg = 1; arg < (unsigned) argc; ++arg) { size_t arg_len = strlen(argv[arg]); @@ -192,6 +206,9 @@ main(int argc, char **argv, char **env) case 't': opt_ts = 1; break; + case 'h': + pr_usage(1); + exit(0); case 'v': fprintf(stderr, "Version: %0.2f\n", VERSION); } @@ -206,23 +223,43 @@ main(int argc, char **argv, char **env) ++opt_pass; } else if (opt_ts == 1) { if (arg_len != TIMESTAMP_SIZE) - pr_error_exit(1, "timestamp length must be %d characters", TIMESTAMP_SIZE); + pr_error_exit(1, "timestamp length must be %d hexadecimal characters", TIMESTAMP_SIZE); strncpy(timestamp, argv[arg], TIMESTAMP_SIZE); ++opt_ts; } } if (! opt_seed && ! opt_pass) - pr_usage(); + pr_usage(0); else if (opt_seed && opt_seed != 2) pr_error_exit(1, "seed requires MAC-ADDRESS"); else if (! opt_seed && opt_pass && opt_pass != 2) pr_error_exit(1, "password on its own requires a pre-generated seed"); else if (opt_seed && opt_pass && opt_pass != 1) pr_error_exit(1, "generating seed and password; cannot also accept pre-generated seed"); - else if (opt_ts == 1) - pr_error_exit(0, "missing timestamp; assuming 000000"); + else if (opt_pass == 2 && opt_ts) + pr_error_exit(1, "seed already contains a timestamp; cannot over-ride it"); + else if (opt_ts == 1 || opt_pass == 2) { // no timestamp provided; use NOW + ts = time(NULL); + if (ts) + snprintf(timestamp, TIMESTAMP_SIZE + 1, "%08lX", ts); + } + if (opt_pass == 2) { // try to figure out the correct date-time from the seed + // inherits the most significant 2 characters from the NOW time + strncpy(timestamp+2, seed, 6); + time_t tmp; + if (sscanf(timestamp, "%08lx", &tmp)) + if (tmp > ts-3600 && tmp < ts+3600) // timestamps are so close they must be for the same date + ts = tmp; + } + + if(opt_ts) { // ts needs to be valid to be converted to a time string + if(! sscanf(timestamp, "%08lx", &ts)) + pr_error_exit(1, "converting timestamp string ('%s') to number", timestamp); + } + t = gmtime(&ts); + strftime(date_string, DATESTRING_SIZE, "%F %T", t); if (opt_seed) if (! generate_seed(MAC_ADDR, timestamp, seed)) @@ -232,7 +269,7 @@ main(int argc, char **argv, char **env) pr_error_exit(0, "unable to generate password"); if (opt_seed || opt_pass) - printf("MAC address: %s Timestamp: %s Seed: %s Password: %s\n", MAC_ADDR, timestamp, seed, password); + printf("MAC address: %s Timestamp: %s (%s) Seed: %s Password: %s\n", MAC_ADDR, timestamp, date_string, seed, password); } return result;