[ZJUCTF2025] 命题人Writeup: AST

发表于 2025-11-25 更新于 2025-11-26 阅读次数：
前排滑跪致歉：对不起给大家喂💩了
TL;DR

出这一题时设想的是出一道AI做不出来的题，如何做不出呢，那自然是token数得多；正好当时在干另外一个事情，就是将一个C代码转为AST，然后解析AST，进行一系列注入标识符替换，运算符提取，控制流展平等等一系列操作，输出一个等价但AST树几乎变样的C代码，用来绕过PTA的检测。
那么就有了这道题：将AST还原为C代码。
降低难度，直接运行还原后的代码会直接输出flag。
为了增加难度（防止根据loc信息直接把源代码还原出来），我们删除了loc,range,name信息，按理来说接下来就是人肉IDA的时间了。
预期的解法是：
手写一个AST to C的脚本（应该是没有现成的工具的）
输出每个节点的信息，手动肉眼看看（可能需要一点耐心，而且还很费眼，所以推荐第一种解法）
然后遇到了这两件事
有人直接把JSON文件拖到Gemini里，然后就直接还原了（现在的AI已经发展到了一种我无法理解的水平.jpg）
clang生成的AST json文件里还有一个键，叫做mangledName，里面存储的是函数/全局变量的原始名字，那这直接看名字就能猜到里面在干什么了还逆个啥啊，导致预期第二种解法难度急剧下降。
总而言之这一题确实有点坏心眼在，然后玩的时候没玩好把自己绕进去了，导致出来的就是这么一道意义不明的题目。以后一定注意。
1	clang -Xclang -ast-dump=json -fsyntax-only ZJUCTF.c > ZJUCTF.json
原始代码

/* FLAG is
ZJUCTF{InDe3d-U_C4n-m0d1fy-UR_PoC-int0_s0me7hinG-byp4s5ing-PTA's_c0de-pl4gi4r1sm-ch3ck}

parts:
ZJUCTF{InDe3d-
U_C4n-m0d1fy-U
R_PoC-int0_s0me7hinG-byp4s
5ing-PTA's_c0de-
pl4gi4r1sm-ch3ck}
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *base64decode(const char *input);

char *base64decode(const char *input)
{
    size_t len = 0;
    char base64Charset[66];
    strcpy(base64Charset, "ABCDIdHIJKLqrstuE6745eIbb7");
    strcpy(base64Charset + 16, "vwxMNOefqhEFGijV97B9Bit7Yres");
    strcpy(base64Charset + 32, "TU234WXYnopyzT1kvQ64ciIo8y12d");
    strcpy(base64Charset + 48, "lmRS567PQZab89+/=");
    while (input[len] != '\0')
    {
        len++;
    }

    base64Charset[4] = 'c';
    base64Charset[24] = 'g';
    size_t y = 44;
    base64Charset[++y] = '0';

    size_t outputLen = (len / 4) * 3;
    if (input[len - 1] == '=')
        outputLen--;
    if (input[len - 2] == '=')
        outputLen--;

    char *output = (char *)malloc(outputLen + 1);
    size_t j = 0;
    size_t i = 0;

    for (; i < len; i += 4)
    {
        int sextet_a = input[i] == '=' ? 0 & i++ : strchr(base64Charset, input[i]) - base64Charset;
        int sextet_b = input[i + 1] == '=' ? 0 & i++ : strchr(base64Charset, input[i + 1]) - base64Charset;
        int sextet_c = input[i + 2] == '=' ? 0 & i++ : strchr(base64Charset, input[i + 2]) - base64Charset;
        int sextet_d = input[i + 3] == '=' ? 0 & i++ : strchr(base64Charset, input[i + 3]) - base64Charset;

        int triple = (sextet_a << 18) + (sextet_b << 12) + (sextet_c << 6) + sextet_d;

        if (j < outputLen)
            output[j++] = (triple >> 16) & 0xFF;
        if (j < outputLen)
            output[j++] = (triple >> 8) & 0xFF;
        if (j < outputLen)
            output[j++] = triple & 0xFF;
    }
    output[outputLen] = '\0';
    return output;
}

char *part1Code = "e4oOv6wHj5W1wHNShC5=";

int part2Code[] = {118, 871, 67, 10, 77, 821, 109, 6, 71, 825, 60, 79, 14, 861};
int cd1(int inputy)
{
    return inputy ^ 0x23;
}
int cd2(int inputy)
{
    return inputy - 776;
}
int cd3(int inputy)
{
    return 67;
}
int cd4(int inputy)
{
    return inputy + 42;
}
int (*part2funcList[])(int) = {cd1, cd2, cd3, cd4};
char *part2Decoded()
{
    size_t len = sizeof(part2Code) / sizeof(part2Code[0]);
    char *result = (char *)malloc(len + 1);
    for (size_t i = 0; i < len; i++)
    {
        result[i] = part2funcList[i % 4](part2Code[i]);
    }
    result[6] = 109;
    result[10] = 102;
    result[len] = '\0';
    return result;
}

char *AES_secret_key = "ZJUCTF{flag_is_here_just_kidding}"; // 32 bytes
char *AES_iv = "This is a RC2 IV"; // 16 bytes

#include <openssl/evp.h>
#include <openssl/err.h>

char *part3_AES_decrypt(const char *encryptedHex) {
    // 初始化OpenSSL
    OpenSSL_add_all_algorithms();
    ERR_load_crypto_strings();

    // 将十六进制字符串转换为二进制数据
    long len = strlen(encryptedHex);
    int enc_len = len / 2;
    unsigned char *enc_data = (unsigned char *)malloc(enc_len);
    
    for(int i = 0; i < enc_len; i++) {
        sscanf(encryptedHex + 2*i, "%2hhx", &enc_data[i]);
    }

    // 创建解密上下文
    EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
    if(!ctx) {
        free(enc_data);
        return NULL;
    }

    // 初始化解密操作
    if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, 
                              (unsigned char*)AES_secret_key, 
                              (unsigned char*)AES_iv)) {
        EVP_CIPHER_CTX_free(ctx);
        free(enc_data);
        return NULL;
    }

    // 分配输出缓冲区（可能需要额外空间用于填充）
    int out_len = enc_len + EVP_CIPHER_CTX_block_size(ctx);
    unsigned char *out_buf = (unsigned char *)malloc(out_len);
    int final_len = 0, total_len = 0;

    // 执行解密
    if(1 != EVP_DecryptUpdate(ctx, out_buf, &out_len, enc_data, enc_len)) {
        free(enc_data);
        free(out_buf);
        EVP_CIPHER_CTX_free(ctx);
        return NULL;
    }
    total_len = out_len;

    // 处理最后的块
    if(1 != EVP_DecryptFinal_ex(ctx, out_buf + total_len, &final_len)) {
        free(enc_data);
        free(out_buf);
        EVP_CIPHER_CTX_free(ctx);
        return NULL;
    }
    total_len += final_len;

    // 添加字符串结束符
    out_buf[total_len] = '\0';

    // 清理资源
    EVP_CIPHER_CTX_free(ctx);
    free(enc_data);

    return (char *)out_buf;
}




unsigned char Part5Code[] = {0x87,0x13,0x90,0x98,0x98,0x98,0x98,0x98,0x98,0x9b,0x9d,0x59,0x4f,0x3a,0x19,0x98,0x98,0x98,0x48,0x7f,0x5a,0xa7,0xd0,0x4a,0x2d,0xcf,0xbd,0xb3,0x89,0x2a,0x13,0xc8,0x81,0xb9,0x2a,0xda,0x0a,0xa5,0x62,0x6e,0xe3,0xd6,0x78,0x72,0x2f,0x32,0x84,0xe6,0xa7,0xfe,0x41,0x0a,0xae,0x07,0x9a,0xcb,0x08,0xe1,0xfd,0x77,0x2c,0x48,0x2c,0x81,0x43,0x2f,0x48,0x0a,0x5e,0x50,0x1f,0x2e,0x02,0x1d,0x13,0x99,0x29,0xa6,0xd3,0x45,0x44,0x4c,0x79,0x1c,0x82,0x40,0xd5,0xea,0xa5,0xb4,0x56,0x17,0x65,0x79,0x59,0xea,0x2a,0xd1,0x67,0x72,0x23,0xdd,0xd7,0x4a,0xaf,0x27,0xe6,0x63,0x8b,0xb0,0x1f,0xdd,0x59,0x01,0x5a,0x3f,0x33,0x03,0x31,0x90,0x8f,0x61,0xa8,0x38,0x1b,0x99,0xf4,0xb1,0x94,0x50,0xbd,0xf3,0xdb,0x24,0x65,0x3c,0xce,0x01,0x78,0xbe,0x6a,0xa6,0x5f,0x32,0x92,0x4c,0x09,0x76,0xe5,0xae,0xa1,0xa4,0x62,0xef,0x27,0xd6,0xf2,0xaf,0xd4,0x97,0x11,0xf4,0x8d,0x71,0x5d,0xa4,0x59,0x57,0xff,0xab,0x0f,0xa7,0xad,0x7b,0x8e,0xf0,0x0e,0xdc,0xb0,0x3a,0xbf,0x4c,0x23,0xf3,0x24,0x4e,0x7a,0x92,0xb9,0xea,0x43,0xce,0xbb,0x1c,0x28,0xb6,0xa7,0x87,0xd7,0x6b,0xc4,0xab,0x8c,0xde,0xd7,0x82,0xe9,0x25,0x6c,0xe2,0x4d,0x0e,0x37,0x0e,0xe6,0x17,0x51,0xdf,0xab,0xe1,0xf5,0x60,0xd9,0xd5,0x6e,0xce,0x94,0xc0,0x6f,0xf9,0x54,0x6c,0x1d,0xb7,0xed,0x1e,0x54,0xf9,0x1b,0xf1,0x72,0x97,0x74,0x9a,0x77,0xc3,0x74,0xac,0x21,0x1c,0x74,0x7c,0xfa,0xad,0xa3,0xa7,0xbe,0x77,0x92,0xc7,0x96,0x8f,0x72,0x82,0x74,0x24,0x0a,0x70,0x71,0x02,0xf8,0x4d,0x6f,0xde,0x18,0xce,0x16,0x7b,0x98,0x14,0x1b,0x9f,0xcf,0x55,0x6f,0x4d,0x27,0xd0,0x9e,0xed,0x9b,0x41,0x5d,0x52,0x30,0xb8,0x71,0xe3,0xec,0x8b,0x65,0xb5,0xf9,0x90,0x3c,0xd5,0xd8,0xac,0xcf,0x29,0xff,0x78,0xd1,0x75,0x86,0x29,0x4b,0x06,0x16,0xc5,0x24,0x3a,0x00,0xb1,0x2f,0x20,0x96,0xe6,0x3b,0x38,0x3d,0x5f,0xba,0x62,0xe6,0x55,0x63,0xf3,0x16,0xf6,0x5f,0x49,0x34,0x4f,0x61,0x59,0x2b,0x03,0xee,0xb3,0x8b,0xe3,0x8d,0xc0,0xd6,0x16,0xef,0xe4,0xff,0xc3,0x30,0x1a,0x06,0xb7,0x71,0xd6,0x7c,0x56,0x46,0x1d,0x22,0x71,0x42,0x60,0x08,0xda,0x44,0x56,0xf6,0x58,0x50,0xb1,0x71,0xbf,0x03,0xe7,0xf7,0x8c,0xe1,0x91,0x39,0xee,0x03,0xf8,0x4a,0xb3,0xe6,0x04,0xf2,0xf4,0xb0,0xf2,0xcc,0x2b,0x7d,0x85,0x5d,0x88,0x95,0x6f,0x7c,0x25,0xb7,0x35,0xa7,0x2a,0x3b,0x90,0xd9,0x6b,0xab,0xbb,0x40,0x97,0x3a,0xac,0x40,0xc1,0x63,0x8b,0x67,0xd3,0x04,0xa6,0x58,0x40,0x73,0xf6,0x93,0xe9,0xc6,0x31,0x21,0x0a,0x4c,0x5a,0x0a,0xd6,0x24,0xa2,0xd0,0x0a,0x55,0x1a,0xc0,0x8b,0x1f,0x9f,0x12,0xe2,0x77,0xca,0xb7,0x57,0xe1,0x25,0x96,0x92,0x20,0x1d,0x1b,0x3d,0xbc,0x2e,0x04,0x77,0x0a,0xd1,0x5d,0xaf,0x9b,0x85,0xb9,0xa5,0x0e,0xd5,0xe9,0x6c,0xb8,0xd4,0x4d,0xb8,0x9f,0xea,0x0f,0xc8,0xeb,0xe3,0x45,0x80,0x2f,0xca,0x17,0x36,0x89,0x95,0x63,0xb5,0x36,0x71,0xb4,0x45,0x62,0x6e,0x9c,0xed,0xbd,0xce,0x06,0x42,0xe3,0x62,0x23,0xc3,0x03,0x7c,0x69,0x29,0xf7,0x17,0xa4,0x42,0x8e,0x20,0xee,0xa9,0xe0,0x10,0x51,0x79,0xb6,0x44,0x44,0xdf,0xa6,0x51,0x85,0x23,0x0d,0x3a,0x43,0x6e,0xd8,0xbb,0x7d,0x7a,0xaa,0x20,0x5e,0x2e,0xd6,0xda,0x02,0xd7,0x7a,0xf5,0x2e,0x47,0x60,0xb4,0x58,0x41,0x5d,0x8b,0xc1,0x81,0x96,0x06,0x62,0x18,0x99,0x25,0x73,0xf1,0x34,0x23,0x9a,0xdf,0x2e,0x6e,0x68,0xf9,0x8a,0x7e,0x24,0x29,0x33,0x1a,0x08,0x64,0x69,0x65,0x60,0x86,0xfc,0x38,0xa4,0x6f,0x1f,0x9f,0x93,0x52,0x26,0xf2,0xcb,0x6c,0xaa,0xd3,0xa9,0xe0,0x4d,0xc5,0xc5,0x32,0xcb,0xa9,0x8a,0x20,0x0f,0xce,0x57,0x8f,0xc4,0x74,0x75,0x7c,0x3f,0x8b,0xc0,0xa7,0x4a,0xf4,0x72,0x9c,0x80,0x38,0xb4,0xd4,0xf4,0x67,0x51,0x4d,0x94,0x35,0xe6,0x2c,0x8a,0x5d,0x14,0x5b,0x9a,0x6f,0xe2,0xb9,0x0d,0x06,0xd0,0x12,0xa2,0xc3,0x7e,0xf0,0xb0,0x3b,0x6c,0xdf,0x24,0x09,0xce,0x4b,0x1e,0xe3,0xec,0x27,0x3c,0x59,0x6e,0xf1,0x87,0x8e,0x33,0x33,0x4a,0xb6,0xaa,0x74,0x7e,0x1a,0x8d,0xd6,0x37,0x74,0x86,0x2d,0x75,0x69,0x53,0xb4,0x6f,0x0b,0xe6,0xd7,0xc7,0xdd,0x58,0xcf,0x21,0xec,0x77,0xb3,0xf7,0x35,0x0c,0x6b,0x3b,0x61,0x47,0xde,0x60,0xea,0x43,0xb9,0x57,0x15,0x62,0x9e,0xc1,0xb0,0x7c,0xd4,0xc0,0xb3,0x94,0x72,0x66,0x77,0x87,0x0f,0x6a,0xfc,0x13,0x14,0x68,0xb8,0xc1,0x39,0x05,0x37,0x03,0x9e,0xe8,0x77,0xcf,0x4a,0x59,0x39,0x27,0x9e,0x8f,0x4e,0x81,0x78,0xe3,0xdc,0x2e,0xfa,0x10,0x26,0x36,0x2c,0x80,0xde,0x0e,0x29,0x43,0x7c,0x12,0xf4,0x69,0xdc,0x68,0xb7,0x43,0xb3,0xd5,0xbc,0xf9,0x09,0xe6,0xed,0xda,0xa2,0x48,0xdd,0xff,0x43,0x4b,0x61,0xdf,0xa0,0x73,0xd0,0xab,0x70,0x51,0xc1,0x91,0x69,0x48,0xf6,0x2f,0x12,0x75,0xb3,0x54,0x93,0x72,0x25,0xf4,0x7b,0x36,0x89,0x35,0x2d,0x78,0xa5,0xb0,0xef,0xd3,0xe3,0xb4,0xe2,0x6e,0xcc,0xe6,0x63,0x46,0xc7,0x05,0xdc,0x7a,0xe8,0x68,0x70,0x55,0xb6,0x59,0xdd,0x6e,0x64,0x59,0x6a,0x45,0x98,0xe4,0x71,0x2d,0xc0,0x2a,0x94,0xd7,0xdd,0xa7,0x7d,0x71,0x57,0x77,0xde,0xf2,0x8e,0x99,0xc2,0x33,0x42,0x1e,0xcc,0x6d,0x08,0x54,0x74,0x12,0xc9,0x82,0x53,0x16,0xce,0x65,0x14,0xed,0xc0,0x3c,0xb3,0x4b,0xe2,0x4d,0x41,0x62,0xf5,0x92,0x0b,0x76,0x7d,0xa0,0x83,0xe8,0x8f,0xf7,0x64,0xb7,0x5f,0x16,0xd3,0x6b,0x27,0xea,0xb3,0xaf,0x36,0x60,0x37,0x2d,0x2b,0xb3,0x16,0xb2,0x10,0x28,0xe9,0x2e,0x82,0xd5,0x1f,0xbb,0x6b,0x74,0xc5,0x1e,0xd4,0x32,0x11,0x57,0x11,0xe6,0x15,0xa9,0xc7,0x06,0xd4,0x90,0x26,0xe8,0xf1,0x8f,0xed,0xb5,0xec,0xca,0x13,0x72,0x35,0x62,0x8d,0x50,0x12,0xe0,0x3c,0x27,0x3b,0x40,0x4b,0x34,0xec,0xa6,0x36,0x7d,0x73,0x17,0x1b,0xa0,0xc6,0x6f,0xb5,0x93,0x06,0x59,0x22,0xd8,0xbe,0x22,0x68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#include <zlib.h>


unsigned char* gzip_decompress(const unsigned char* compressed_data, 
                              size_t compressed_size, 
                              size_t* decompressed_size) {
    if (!compressed_data || compressed_size == 0) {
        return NULL;
    }

    z_stream strm;
    unsigned char* decompressed_data = NULL;
    size_t buffer_size = compressed_size * 4;  // 初始缓冲区大小
    int ret;

    // 初始化zlib流
    memset(&strm, 0, sizeof(strm));
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.avail_in = compressed_size;
    strm.next_in = (Bytef*)compressed_data;

    // 使用gzip格式解压
    ret = inflateInit2(&strm, 16 + MAX_WBITS);
    if (ret != Z_OK) {
        fprintf(stderr, "inflateInit2 failed: %d\n", ret);
        return NULL;
    }

    // 分配解压缓冲区
    decompressed_data = (unsigned char*)malloc(buffer_size);
    if (!decompressed_data) {
        inflateEnd(&strm);
        return NULL;
    }

    strm.avail_out = buffer_size;
    strm.next_out = decompressed_data;

    // 解压数据
    do {
        ret = inflate(&strm, Z_NO_FLUSH);
        
        switch (ret) {
            case Z_NEED_DICT:
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                fprintf(stderr, "inflate failed: %d\n", ret);
                free(decompressed_data);
                inflateEnd(&strm);
                return NULL;
        }

        // 如果输出缓冲区不足，重新分配更大的缓冲区
        if (strm.avail_out == 0) {
            size_t old_size = buffer_size;
            buffer_size *= 2;
            unsigned char* new_data = (unsigned char*)realloc(decompressed_data, buffer_size);
            if (!new_data) {
                free(decompressed_data);
                inflateEnd(&strm);
                return NULL;
            }
            decompressed_data = new_data;
            
            strm.next_out = decompressed_data + old_size;
            strm.avail_out = buffer_size - old_size;
        }
    } while (ret != Z_STREAM_END);

    // 设置解压后数据大小
    *decompressed_size = buffer_size - strm.avail_out;

    // 清理
    inflateEnd(&strm);

    return decompressed_data;
}


unsigned char* Part5decode()
{
    for(int i=0; i<sizeof(Part5Code)/sizeof(Part5Code[0]); i++)
    {
        Part5Code[i] = Part5Code[i] ^ 0x98;
    }
    size_t decompressed_size;
    unsigned char *decompressedData = gzip_decompress((unsigned char*)Part5Code, sizeof(Part5Code), &decompressed_size);
    // printf("Decompressed size: %zu\n", decompressed_size);
    // printf("Decompressed data: %.*s\n", (int)decompressed_size, decompressedData);

    // free(part5Data);
    unsigned char *finalData = malloc(sizeof(unsigned char)*90);
    for(int i=6; i<2048; i+=133)
    {
        finalData[(i-6)/133] = decompressedData[i];
    }
    finalData[16] = '\0';
    // free(decompressedData);
    return finalData;
}


unsigned char Part6Code[] = {
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};
#define _GNU_SOURCE
#include <sys/syscall.h>
#include <unistd.h>
int Part6decode()
{
    for(int i=0; i<sizeof(Part6Code)/sizeof(Part6Code[0]); i++)
    {
        Part6Code[i] = Part6Code[i] ^ 0x98;
    }
    size_t decompressed_size;
    unsigned char *decompressedData = gzip_decompress((unsigned char*)Part6Code, sizeof(Part6Code), &decompressed_size);
    int fd = syscall(SYS_memfd_create, "mem", 0);
    write(fd, decompressedData, decompressed_size);
    
    // 执行
    char *argv[] = {NULL};
    char *envp[] = {NULL};
    fexecve(fd, argv, envp);
    perror("fexecve");
    return 1;
}



int main()
{
    char *decodedPart1 = base64decode(part1Code);
    printf("%s", decodedPart1);
    free(decodedPart1);
    char *decodedPart2 = part2Decoded();
    printf("%s", decodedPart2);
    free(decodedPart2);
    char *encryptedPart3 = "e3d08f470b061df1cca94eb68adaffb011f1f19f26770496494033f497302ffe";
    char *decryptedPart3 = part3_AES_decrypt(encryptedPart3);
    printf("%s", decryptedPart3);
    free(decryptedPart3);
    unsigned char *part5Data = Part5decode();
    printf("%s", part5Data);
    fflush(stdout);
    free(part5Data);
    Part6decode();

    return 0;
}