| #include <T.h> |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/stat.h> |
| #include <sysexits.h> |
| |
| #ifdef ASN1_TEXT |
| #define STRINGIFY(x) #x |
| #define ASN1_STR STRINGIFY(ASN1_TEXT) |
| #else |
| #define ASN1_STR "T" |
| #endif |
| |
| static const struct encoding_map { |
| const char *name; |
| const char *dir_name; |
| enum asn_transfer_syntax syntax; |
| } encodings[] = { |
| {"DER", "der", ATS_DER}, |
| {"OER", "oer", ATS_CANONICAL_OER}, |
| {"UPER", "uper", ATS_UNALIGNED_CANONICAL_PER}, |
| {"XER", "xer", ATS_CANONICAL_XER}, |
| }; |
| |
| static enum asn_transfer_syntax |
| lookup_syntax(const char *name) { |
| if(name) { |
| for(size_t i = 0; i < sizeof(encodings) / sizeof(encodings[0]); i++) { |
| struct encoding_map enc = encodings[i]; |
| if(strcasecmp(name, enc.name) == 0) { |
| return enc.syntax; |
| } |
| } |
| } |
| return ATS_INVALID; |
| } |
| |
| |
| #ifdef ENABLE_LIBFUZZER |
| |
| static int initialized; |
| static enum asn_transfer_syntax syntax; |
| static void __attribute__((constructor)) initialize() { |
| initialized = 1; |
| const char *data_dir = getenv("ASN1_DATA_DIR"); |
| if(data_dir && strrchr(data_dir, '/')) { |
| data_dir = strrchr(data_dir, '/') + 1; |
| } |
| syntax = lookup_syntax(data_dir); |
| if(syntax == ATS_INVALID) { |
| fprintf(stderr, |
| "Expected ASN1_DATA_DIR={der,oer,uper,xer} environment " |
| "variable.\n"); |
| exit(EX_UNAVAILABLE); |
| } |
| } |
| |
| int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size); |
| |
| int |
| LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| if(!initialized) exit(0); |
| |
| /* |
| * Try to decode whatever garbage that comes in Data/Size. |
| * The idea is that we should not crash, and we should not leak memory, |
| * no matter what garbage we're dealing with. |
| */ |
| T_t *structure = 0; |
| (void)asn_decode(0, syntax, &asn_DEF_T, (void **)&structure, Data, Size); |
| ASN_STRUCT_FREE(asn_DEF_T, structure); |
| |
| return 0; |
| } |
| |
| #else /* The usual check */ |
| |
| static void |
| usage(const char *progname) { |
| fprintf(stderr, |
| "Usage: %s {-c|-g <dir>} [-n <number>] [-e <encoding> ...]\n" |
| "OPTIONS:\n" |
| " -c Check encode-decode round-trip on random data\n" |
| " -g <dir> Generate random data for selected encodings\n" |
| " -s <size> Approximate max random value size for -c and -g\n" |
| " -n <number> Number of iterations for -c and -g\n" |
| " -e <encoding> Encodings to test or generate random data for\n" |
| "Encodings (ASN.1 Transfer Syntaxes):\n" |
| " DER Distinguished Encoding Rules (compatible with " |
| "BER)\n" |
| " OER Canonical Octet Encoding Rules\n" |
| " UPER Canonical Unaligned Packed Encoding Rules\n" |
| " XER XML Encoding Rules\n", |
| progname); |
| } |
| |
| static int |
| file_write_cb(const void *data, size_t size, void *key) { |
| return fwrite(data, 1, size, (FILE *)key) == size ? 0 : -1; |
| } |
| |
| #ifndef PATH_MAX |
| #define PATH_MAX 255 |
| #endif |
| |
| static void |
| generate_random_data(enum asn_transfer_syntax syntax, const char *top_dirname, size_t max_random_value_size, int iterations, int debug) { |
| char dirname[PATH_MAX]; |
| size_t dirname_len = 0; |
| dirname[dirname_len] = '\0'; |
| |
| for(size_t i = 0; i < sizeof(encodings)/sizeof(encodings[0]); i++) { |
| struct encoding_map enc = encodings[i]; |
| if(enc.syntax == syntax) { |
| int r = snprintf(dirname, sizeof(dirname), "%s/%s", top_dirname, |
| enc.dir_name); |
| if(r >= sizeof(dirname) - sizeof("filename.bin")) { |
| fprintf(stderr, "Too long filenames\n"); |
| exit(EX_SOFTWARE); |
| } |
| dirname_len = r; |
| fprintf(stderr, "Generating %d random %s values of %s into %s\n", |
| iterations, enc.name, asn_DEF_T.name, dirname); |
| break; |
| } |
| } |
| assert(dirname[0]); |
| |
| (void)mkdir(top_dirname, 0777); |
| |
| if(mkdir(dirname, 0777) == -1) { |
| if(errno == EEXIST) { |
| fprintf(stderr, "%s: is already present, remove.\n", dirname); |
| fprintf(stderr, "%s: not overwriting potentially valuable data.\n", |
| dirname); |
| } |
| perror(dirname); |
| exit(2); |
| } |
| |
| size_t generated_ok = 0; |
| for(int i = 0; i < iterations; i++) { |
| T_t *structure = 0; |
| FILE *f; |
| snprintf(&dirname[dirname_len], sizeof(dirname) - dirname_len, |
| "/%03d.bin", i); |
| |
| if(asn_random_fill(&asn_DEF_T, (void **)&structure, |
| max_random_value_size) |
| == -1) { |
| assert(structure == 0); |
| fprintf(stderr, "Can't generate %d'th value, skipping\n", i); |
| continue; |
| } |
| assert(structure != 0); |
| |
| const char *filename = dirname; |
| f = fopen(filename, "wb"); |
| if(!f) { |
| perror(filename); |
| assert(f); |
| exit(EX_SOFTWARE); |
| } |
| asn_enc_rval_t rval = |
| asn_encode(0, syntax, &asn_DEF_T, structure, file_write_cb, f); |
| fclose(f); |
| if(rval.encoded == -1) { |
| fprintf(stderr, "Cannot encode a random value of T into %s:\n", |
| filename); |
| if(rval.failed_type) { |
| fprintf(stderr, "(Failed type: %s)\n", rval.failed_type->name); |
| } |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| exit(EX_SOFTWARE); |
| } |
| |
| if(debug) { |
| if(i < 5 || debug > 1) { |
| fprintf(stderr, "[%s] ", &filename[dirname_len+1]); |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| } else if(i == 5) { |
| fprintf(stderr, "... and so on\n"); |
| } |
| } |
| |
| ASN_STRUCT_FREE(asn_DEF_T, structure); |
| generated_ok++; |
| } |
| |
| if(!generated_ok) { |
| fprintf(stderr, "Requested to generate %d values, but failed.\n", |
| iterations); |
| exit(EX_SOFTWARE); |
| } |
| |
| } |
| |
| static void |
| check_random_roundtrip(enum asn_transfer_syntax syntax, size_t max_random_value_size, int iterations, int debug) { |
| struct encoding_map enc; |
| |
| for(size_t i = 0; i < sizeof(encodings)/sizeof(encodings[0]); i++) { |
| enc = encodings[i]; |
| if(enc.syntax == syntax) { |
| fprintf(stderr, "Testing %d iterations of round-trip for %s\n", |
| iterations, enc.name); |
| break; |
| } |
| } |
| |
| for(int i = 0; i < iterations; i++) { |
| char tmp_buffer[512]; |
| char *buffer = tmp_buffer; |
| size_t buffer_size = sizeof(tmp_buffer); |
| T_t *structure = 0; |
| T_t *decoded_structure = 0; |
| |
| if(asn_random_fill(&asn_DEF_T, (void **)&structure, |
| max_random_value_size) |
| == -1) { |
| assert(structure == 0); |
| fprintf(stderr, "Can't generate %d'th value, skipping\n", i); |
| continue; |
| } |
| assert(structure != 0); |
| |
| asn_enc_rval_t er; |
| for(;;) { |
| er = asn_encode_to_buffer( |
| 0, syntax, &asn_DEF_T, structure, buffer, buffer_size); |
| if(er.encoded == -1) { |
| fprintf(stderr, "Encoded T into %zd bytes\n", er.encoded); |
| fprintf(stderr, "Structure %s:\n", |
| sizeof(ASN1_STR) > 60 ? "T" : ASN1_STR); |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| assert(er.encoded >= 0); |
| exit(EX_SOFTWARE); |
| } |
| if(er.encoded > buffer_size && buffer == tmp_buffer) { |
| if(debug) { |
| fprintf( |
| stderr, |
| "Reallocate output buffer %zu -> %zu (iteration %d)\n", |
| buffer_size, er.encoded, i); |
| } |
| buffer = malloc(er.encoded + 1); |
| assert(buffer); |
| buffer[er.encoded] = '\0'; |
| buffer_size = er.encoded; |
| continue; |
| } |
| break; |
| } |
| if(er.encoded > buffer_size) { |
| fprintf(stderr, "Data %zd does not fit into buffer %zu\n", |
| er.encoded, buffer_size); |
| assert(er.encoded <= buffer_size); |
| } |
| |
| asn_dec_rval_t rval = |
| asn_decode(0, syntax, &asn_DEF_T, (void **)&decoded_structure, |
| buffer, er.encoded); |
| if(rval.code == RC_OK) { |
| /* Everything's cool... or is it? Expecting a proper consumed */ |
| if(rval.consumed != er.encoded) { |
| fprintf(stderr, "Encoded into %zd, yet consumed %zu\n", |
| er.encoded, rval.consumed); |
| fprintf(stderr, "Original random structure:\n"); |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| assert(rval.consumed == er.encoded); |
| exit(EX_SOFTWARE); |
| } |
| } else { |
| fprintf(stderr, |
| "Decoding %zu bytes of T yielded %s after byte %zu\n", |
| er.encoded, rval.code == RC_FAIL ? "RC_FAIL" : "RC_WMORE", |
| rval.consumed); |
| fprintf(stderr, "Original random structure:\n"); |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| exit(EX_SOFTWARE); |
| } |
| |
| /* |
| * Confirm that we decoded the same data. |
| */ |
| int cmp = asn_DEF_T.op->compare_struct(&asn_DEF_T, structure, |
| decoded_structure); |
| if(cmp != 0) { |
| fprintf(stderr, "Random %s value:\n", ASN1_STR); |
| asn_fprint(stderr, &asn_DEF_T, structure); |
| fprintf(stderr, "Decoded %s value:\n", ASN1_STR); |
| asn_fprint(stderr, &asn_DEF_T, decoded_structure); |
| assert(cmp == 0); |
| } |
| ASN_STRUCT_FREE(asn_DEF_T, structure); |
| ASN_STRUCT_FREE(asn_DEF_T, decoded_structure); |
| |
| if(buffer != tmp_buffer) { |
| free(buffer); |
| } |
| |
| if(i < 5) { |
| fprintf(stderr, "[%03d] round-trip in %zd bytes OK\n", i, |
| er.encoded); |
| } else if(i == 5) { |
| fprintf(stderr, "... and so on\n"); |
| } |
| } |
| |
| fprintf(stderr, "OK %d iterations of round-trip for %s\n", iterations, |
| enc.name); |
| } |
| |
| int main(int argc, char **argv) { |
| uint32_t enabled_encodings = 0; |
| enum { |
| MODE_UNKNOWN, |
| MODE_GENERATE_RANDOM_DATA, |
| MODE_CHECK_RANDOM_ROUNDTRIP |
| } mode = MODE_UNKNOWN; |
| const char *generate_into_dir = NULL; |
| int iterations = 100; |
| size_t max_random_value_size = 128; |
| int debug = 0; |
| int c; |
| |
| while((c = getopt(argc, argv, "cde:g:hn:s:")) != -1) { |
| switch(c) { |
| case 'c': |
| mode = MODE_CHECK_RANDOM_ROUNDTRIP; |
| break; |
| case 'd': |
| debug = 1; |
| break; |
| case 'e': |
| enabled_encodings |= 1 << lookup_syntax(optarg); |
| if(enabled_encodings & (1 << ATS_INVALID)) { |
| fprintf(stderr, "-e %s: Unknown (unsupported?) encoding\n", |
| optarg); |
| exit(EX_UNAVAILABLE); |
| } |
| break; |
| case 'g': |
| mode = MODE_GENERATE_RANDOM_DATA; |
| generate_into_dir = optarg; |
| break; |
| case 'h': |
| usage(argv[0]); |
| exit(0); |
| case 'n': |
| iterations = atoi(optarg); |
| if(iterations <= 0) { |
| fprintf(stderr, "-n %s: positive value expected\n", optarg); |
| exit(EX_DATAERR); |
| } |
| break; |
| case 's': |
| if(atoi(optarg) <= 0) { |
| fprintf(stderr, "-s %s: positive value expected\n", optarg); |
| exit(EX_DATAERR); |
| } |
| max_random_value_size = atoi(optarg); |
| break; |
| default: |
| usage(argv[0]); |
| exit(2); |
| } |
| } |
| |
| if(mode == MODE_UNKNOWN) { |
| usage(argv[0]); |
| exit(2); |
| } else if(!enabled_encodings) { |
| for(size_t i = 0; i < sizeof(encodings)/sizeof(encodings[0]); i++) { |
| enabled_encodings |= 1 << encodings[i].syntax; |
| } |
| } |
| |
| /* Enumerate requested encodings (-e ...) */ |
| for(unsigned i = 0; i < 8*sizeof(enabled_encodings)-1; i++) { |
| if(enabled_encodings & (1 << i)) { |
| enum asn_transfer_syntax syntax = i; |
| switch(mode) { |
| case MODE_UNKNOWN: |
| assert(mode != MODE_UNKNOWN); |
| break; |
| case MODE_GENERATE_RANDOM_DATA: |
| generate_random_data(syntax, generate_into_dir, |
| max_random_value_size, iterations, debug); |
| break; |
| case MODE_CHECK_RANDOM_ROUNDTRIP: |
| check_random_roundtrip(syntax, max_random_value_size, |
| iterations, debug); |
| break; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| #endif |