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exploit_exercises_protostar:final1
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exploit_exercises_protostar:final1 [2017/04/09 15:33] (Version actuelle) |
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| + | ====== Final 1 ====== | ||
| + | <code C> | ||
| + | |||
| + | #include "../common/common.c" | ||
| + | |||
| + | #include <syslog.h> | ||
| + | |||
| + | #define NAME "final1" | ||
| + | #define UID 0 | ||
| + | #define GID 0 | ||
| + | #define PORT 2994 | ||
| + | |||
| + | char username[128]; | ||
| + | char hostname[64]; | ||
| + | |||
| + | void logit(char *pw) | ||
| + | { | ||
| + | char buf[512]; | ||
| + | snprintf(buf, sizeof(buf), "Login from %s as [%s] with password [%s]\n", hostname, username, pw); | ||
| + | syslog(LOG_USER|LOG_DEBUG, buf); | ||
| + | } | ||
| + | |||
| + | void trim(char *str) | ||
| + | { | ||
| + | char *q; | ||
| + | |||
| + | q = strchr(str, '\r'); | ||
| + | if(q) *q = 0; | ||
| + | q = strchr(str, '\n'); | ||
| + | if(q) *q = 0; | ||
| + | } | ||
| + | |||
| + | void parser() | ||
| + | { | ||
| + | char line[128]; | ||
| + | |||
| + | printf("[final1] $ "); | ||
| + | |||
| + | while(fgets(line, sizeof(line)-1, stdin)) | ||
| + | { | ||
| + | trim(line); | ||
| + | |||
| + | if(strncmp(line, "username ", 9) == 0) { | ||
| + | strcpy(username, line+9); | ||
| + | } | ||
| + | else if(strncmp(line, "login ", 6) == 0) | ||
| + | { | ||
| + | if(username[0] == 0) | ||
| + | { | ||
| + | printf("invalid protocol\n"); | ||
| + | } | ||
| + | else | ||
| + | { | ||
| + | logit(line + 6); | ||
| + | printf("login failed\n"); | ||
| + | } | ||
| + | } | ||
| + | printf("[final1] $ "); | ||
| + | } | ||
| + | } | ||
| + | |||
| + | void getipport() | ||
| + | { | ||
| + | int l; | ||
| + | struct sockaddr_in sin; | ||
| + | |||
| + | l = sizeof(struct sockaddr_in); | ||
| + | if(getpeername(0, &sin, &l) == -1) { | ||
| + | err(1, "you don't exist"); | ||
| + | } | ||
| + | |||
| + | sprintf(hostname, "%s:%d", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port)); | ||
| + | } | ||
| + | |||
| + | int main(int argc, char **argv, char **envp) | ||
| + | { | ||
| + | int fd; | ||
| + | char *username; | ||
| + | |||
| + | /* Run the process as a daemon */ | ||
| + | background_process(NAME, UID, GID); | ||
| + | |||
| + | /* Wait for socket activity and return */ | ||
| + | fd = serve_forever(PORT); | ||
| + | |||
| + | /* Set the client socket to STDIN, STDOUT, and STDERR */ | ||
| + | set_io(fd); | ||
| + | |||
| + | getipport(); | ||
| + | parser(); | ||
| + | |||
| + | } | ||
| + | </code> | ||
exploit_exercises_protostar/final1.txt · Dernière modification: 2017/04/09 15:33 (modification externe)
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