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Fuzz-test mg_http_var and base64

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This commit is contained in:
cpq 2020-12-07 18:52:40 +00:00
parent 228acefa36
commit d1b8f9e01f
4 changed files with 13 additions and 45 deletions
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8
Makefile
View File

@ -15,9 +15,11 @@ EXAMPLE_TARGET ?= example
.PHONY: ex test
ifeq "$(SSL)" "MBEDTLS"
MBEDTLSDIR ?= $(shell "$(brew --cellar mbedtls)/$(brew info mbedtls --json | jq -j .[0].installed[0].version)")
CFLAGS += -DMG_ENABLE_MBEDTLS=1 -I$(MBEDTLSDIR)/include -I/usr/include
LDFLAGS ?= -L$(MBEDTLSDIR)/lib -lmbedtls -lmbedcrypto -lmbedx509
MBEDTLS_DIR ?= $(shell brew --cellar mbedtls)
MBEDTLS_VER ?= $(shell brew info mbedtls --json | jq -j .[0].installed[0].version)
MBEDTLS ?= $(MBEDTLS_DIR)/$(MBEDTLS_VER)
CFLAGS += -DMG_ENABLE_MBEDTLS=1 -I$(MBEDTLS)/include -I/usr/include
LDFLAGS ?= -L$(MBEDTLS)/lib -lmbedtls -lmbedcrypto -lmbedx509
endif
ifeq "$(SSL)" "OPENSSL"
OPENSSLDIR ?= $(shell "$(brew --cellar openssl)/$(brew info openssl --json | jq -j .[0].installed[0].version)")

21
mongoose.c
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@ -97,31 +97,10 @@ int mg_base64_final(char *to, int n) {
}
int mg_base64_encode(const unsigned char *p, int n, char *to) {
#if 0
char buf[4];
int i, j, len = 0;
for (i = 0; i < n; i += 3) {
int a = p[i], b = i + 1 < n ? p[i + 1] : 0, c = i + 2 < n ? p[i + 2] : 0;
buf[0] = mg_b64idx(a >> 2);
buf[1] = mg_b64idx((a & 3) << 4 | (b >> 4));
buf[2] = mg_b64idx((b & 15) << 2 | (c >> 6));
buf[3] = mg_b64idx(c & 63);
j = 0;
if (i + 1 >= n) buf[2] = '=', j++;
if (i + 2 >= n) buf[3] = '=', j++;
memcpy(to + len, buf, sizeof(buf));
len += sizeof(buf);
}
to[len] = '\0';
printf("%d[%.*s] -> %d[%.*s]\n", n, n, p, len, len, to);
return len;
#else
int i, len = 0;
for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
len = mg_base64_final(to, len);
// printf("%d[%.*s] -> %d[%.*s]\n", n, n, p, len, len, to);
return len;
#endif
}
int mg_base64_decode(const char *src, int n, char *dst) {

21
src/base64.c
View File

@ -58,31 +58,10 @@ int mg_base64_final(char *to, int n) {
}
int mg_base64_encode(const unsigned char *p, int n, char *to) {
#if 0
char buf[4];
int i, j, len = 0;
for (i = 0; i < n; i += 3) {
int a = p[i], b = i + 1 < n ? p[i + 1] : 0, c = i + 2 < n ? p[i + 2] : 0;
buf[0] = mg_b64idx(a >> 2);
buf[1] = mg_b64idx((a & 3) << 4 | (b >> 4));
buf[2] = mg_b64idx((b & 15) << 2 | (c >> 6));
buf[3] = mg_b64idx(c & 63);
j = 0;
if (i + 1 >= n) buf[2] = '=', j++;
if (i + 2 >= n) buf[3] = '=', j++;
memcpy(to + len, buf, sizeof(buf));
len += sizeof(buf);
}
to[len] = '\0';
printf("%d[%.*s] -> %d[%.*s]\n", n, n, p, len, len, to);
return len;
#else
int i, len = 0;
for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
len = mg_base64_final(to, len);
// printf("%d[%.*s] -> %d[%.*s]\n", n, n, p, len, len, to);
return len;
#endif
}
int mg_base64_decode(const char *src, int n, char *dst) {

8
test/fuzz.c
View File

@ -8,11 +8,19 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
struct mg_http_message hm;
mg_http_parse((const char *) data, size, &hm);
struct mg_str body = mg_str_n((const char *) data, size);
char tmp[256];
mg_http_get_var(&body, "key", tmp, sizeof(tmp));
struct mg_mqtt_message mm;
mg_mqtt_parse(data, size, &mm);
struct timeval tv;
mg_sntp_parse(data, size, &tv);
char buf[size * 4 / 3 + 5]; // At least 4 chars and nul termination
mg_base64_decode((char *) data, size, buf);
mg_base64_encode(data, size, buf);
return 0;
}