Scramble input
This commit is contained in:
20
client.c
20
client.c
@@ -10,6 +10,15 @@
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#include <zlib.h>
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#include <zlib.h>
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#define BUF_LEN 1024
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#define BUF_LEN 1024
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#define SECRET "eiph0aChThu17ah9rua4Naiv4"
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char *unscramble(char *s) {
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for (char *str = s + 1; *str != 0; str += 2) {
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*s++ = *str;
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}
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*s = '\0';
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return s;
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}
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void open_connection(const char *hostname, const char *port, const char *msg) {
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void open_connection(const char *hostname, const char *port, const char *msg) {
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int sfd, s;
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int sfd, s;
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@@ -64,12 +73,17 @@ void open_connection(const char *hostname, const char *port, const char *msg) {
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fprintf(stderr, "No compression methods enabled\n");
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fprintf(stderr, "No compression methods enabled\n");
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}
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}
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char flag[sizeof(SECRET)];
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strcpy(flag, SECRET);
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unscramble(flag);
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char buf[BUF_LEN] = {0};
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char buf[BUF_LEN] = {0};
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strcat(buf, "GET /");
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strcat(buf, "GET /");
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strncat(buf, msg, BUF_LEN / 2);
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strncat(buf, msg, BUF_LEN / 2);
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strcat(buf, " HTTP/1.1\r\nHost: iut.local\r\n");
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strcat(buf, " HTTP/1.1\r\nHost: iut.local\r\n");
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strcat(buf, "Connection: close\r\n");
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strcat(buf, "Connection: close\r\n");
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strcat(buf, "Cookie: flag=bAr5\r\n");
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strcat(buf, "Cookie: flag=");
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strcat(buf, flag);
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strcat(buf, "\r\n");
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strcat(buf, "\r\n");
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SSL_write(ssl, buf, strlen(buf));
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SSL_write(ssl, buf, strlen(buf));
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@@ -77,8 +91,8 @@ void open_connection(const char *hostname, const char *port, const char *msg) {
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uLong ucompSize = strlen(buf);
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uLong ucompSize = strlen(buf);
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// Use a compression level of 9
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// Use a compression level of 9
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uLong compSize = compressBound(ucompSize);
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uLong compSize = compressBound(ucompSize);
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char *comp = malloc(compSize);
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Bytef *comp = malloc(compSize);
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compress(comp, &compSize, buf, ucompSize);
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compress(comp, &compSize, (unsigned char *)buf, ucompSize);
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free(comp);
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free(comp);
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printf("Sent %lu data bytes\n", compSize);
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printf("Sent %lu data bytes\n", compSize);
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} else {
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} else {
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@@ -8,7 +8,7 @@ Cloner le dépôt Git à l'IUT ou sur votre machine.
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```bash
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```bash
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git clone https://codefirst.iut.uca.fr/git/clement.freville2/http-crime
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git clone https://codefirst.iut.uca.fr/git/clement.freville2/http-crime
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cd crime-http
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cd http-crime
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```
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```
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Compiler le projet avec Make, et générez un certificat auto-signé à l'aide d'OpenSSL.
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Compiler le projet avec Make, et générez un certificat auto-signé à l'aide d'OpenSSL.
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