pam_post_auth.c

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#include "pam_post_auth.h"
 
int exec_deauth(char *bt_addr, const char *username, FILE *log_fp, const char *trusted_dir_path) {
    int pid = fork();
 
    if (pid == 0) { //child process
        char *path = NULL;
 
        char curr_time[50];
 
        if (log_fp) {
            get_login_time(curr_time);
        }
 
        int len = strlen(trusted_dir_path) + strlen(DEAUTH);
 
        if (!(path = malloc(sizeof(char) + len + 1))) {
            perror("malloc");
            fprintf(log_fp, "%s: (exec_deauth) malloc Error\n", curr_time);
            return PAM_BUF_ERR;
        }
 
        if (!(strncpy(path, trusted_dir_path, strlen(trusted_dir_path)))) {
            perror("strncpy");
            fprintf(log_fp, "%s: (exec_deauth) strncpy Error\n", curr_time);
            return PAM_BUF_ERR;
        }
 
        path[strlen(trusted_dir_path)] = '\0';
 
        if (!(strncat(path, DEAUTH, strlen(DEAUTH) + 1))) {
            perror("strncat");
            fprintf(log_fp, "%s: (exec_deauth) strncat Error\n", curr_time);
            return PAM_BUF_ERR;
        }
        path[len] = '\0';
 
        struct passwd *pass = NULL;
        if (!(pass = getpwnam(username))) {
            fprintf(log_fp, "%s: (exec_deauth) getpwnam Error. Trued to get uid of user %s\n", curr_time, username);
            perror("getpwnam");
            return PAM_SYSTEM_ERR;
        }
        
        setuid(pass->pw_uid);
 
        if ((execl(path, path, bt_addr, NULL)) == -1) {
            perror("exec");
            fprintf(log_fp, "%s: (exec_deauth) execl Error\n", curr_time);
            return PAM_SYSTEM_ERR;
        }
    }
    return PAM_SUCCESS; 
}