question 9

question9/Makefile

+pwg: pwg.c
+	gcc -Wall -Wextra -D_XOPEN_SOURCE=500 -g pwg.c check_pass.c -o pwg -lcrypt
+

question9/check_pass.c

+#include<stdio.h>
+#include <unistd.h>
+
+int removeFile(char * f){
+    if (remove(f) == 0){
+        return 0;
+    }
+    else
+    {    
+        printf("Impossible de supprimer le fichier\n");
+        perror("Erreur");
+        return 1;
+    }
+}
+
+int insertNewPaswd(int fisrtPwd, char* username, char* newPwd,FILE* temp){
+    do
+    {
+        printf("saisir votre nouveau mot de passe: ");
+        fgets(newPwd, 20, stdin);
+        newPwd[strcspn(newPwd, "\n")] = 0;
+        if(strlen(newPwd)<1)
+            printf("le mot de passe doit faire au moins 1 caractere \n");
+    } while (strlen(newPwd)<1);
+
+    if(fisrtPwd==1)
+        fputs(strcat(username,"\n"), temp);
+
+    // l'enregistrer en chiffrant
+    // encrypt(newPwd, pwdCrypted);
+    //TODO : crypt new pwd
+    fputs(strcat(newPwd,"\n"), temp);
+    printf("new mdp: %s", newPwd);
+
+    return 0;
+}

question9/check_pass.h

+#ifndef PWG_H_
+#define PWG_H_
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define PASSWORD_MAX_SIZE 1024
+#define BUFFER_MAX_SIZE 1024
+#define PATH_TEMP_FILE "/etc/admini/temp"
+#define PATH_PWD_FILE "/etc/admini/passwd"
+
+int removeFile(char * f);
+int insertNewPaswd(int fisrtPwd, char *username, char *newPwd, FILE *temp);
+
+#endif

question9/passwd

+nicolasfernandes
+kk

question9/pwg.c

+#define _XOPEN_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <grp.h>
+#include "check_pass.h"
+
+char* encrypter(char *password) {
+    unsigned long seed[2];
+    char salt[] = "$1$ierfdjef";
+    const char *const seedchars = 
+    "./0123456789ABCDEFGHIJKLMNOPQRST"
+    "UVWXYZabcdefghijklmnopqrstuvwxyz";
+    int i;
+
+    seed[0] = time(NULL);
+    seed[1] = getpid() ^ (seed[0] >> 14 & 0x30000);
+
+    for (i = 0; i < 8; i++)
+        salt[3+i] = seedchars[(seed[i/5] >> (i%5)*6) & 0x3f];
+
+    crypt(password, salt);
+    return password;
+}
+
+void swapPwdFile(){
+    //remove /etc/admini/passwd
+    removeFile(PATH_PWD_FILE);
+    //rename temp in /etc/admini/temp
+    rename(PATH_TEMP_FILE,PATH_PWD_FILE);
+}
+
+int main(int argc, char *argv[])
+{
+    char * username = getenv("USER");
+    char str[PASSWORD_MAX_SIZE];
+    FILE* f = fopen(PATH_PWD_FILE, "r");
+    FILE* temp = fopen(PATH_TEMP_FILE, "w");
+    char *oldPwd = NULL;
+    char str2[BUFFER_MAX_SIZE];
+    char newPwd[PASSWORD_MAX_SIZE];
+    int firstPwd = 1;
+
+    if(f==NULL){
+        printf("Impossible d'acceder au passwords");
+        exit(1);
+    }
+
+    // verifier si l'uilisateur a un mdp
+    while (fgets(str, 20, f) != NULL )
+    {
+        fputs(str, temp);
+        //on retire le caractere \n de fgets
+        str[strcspn(str, "\n")] = 0;
+        if(strcmp(username,str)==0){
+            firstPwd = 0;
+            fgets(str, 20, f);
+            str[strcspn(str, "\n")] = 0;
+            oldPwd = str;
+            if(oldPwd!=NULL){
+                //TODO : compare crypt pwd
+                do
+                {
+                    printf("saisir votre ancien mot de passe: ");
+                    fgets(str2, 20, stdin);
+                    str2[strcspn(str2, "\n")] = 0;
+                    if (strcmp(oldPwd, str2) != 0)
+                        printf("mot de passe incorrect\n");
+                } while (strcmp(oldPwd, str2) != 0);
+            }
+
+            insertNewPaswd(firstPwd, username, newPwd, temp);
+        }
+    }
+
+    if(firstPwd==1)
+        insertNewPaswd(firstPwd, username, newPwd, temp);
+    
+    swapPwdFile();
+    fclose(f);
+
+    return 0;
+}

question9/rmg.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <grp.h>  
+#include <sys/types.h>
+#include <sys/stat.h>
+
+int sameGroup(int gid, gid_t groups[], int ngroups){
+    int i;
+    printf("%o",ngroups);
+    for (int i = 0; i < ngroups; i++){
+        printf("fuck");
+        if (groups[i] == gid)
+            return 0;
+    }
+    return -1;
+}
+
+int check_groupID(char pathname, char name) {
+    struct stat buf;
+    int userGID;
+    int ngroups = 0;
+
+    lstat(pathname, &buf);
+
+    userGID = getegid();
+    getgrouplist(name, userGID, NULL, &ngroups);
+    gid_t groups[ngroups];
+    getgrouplist(name, userGID, groups, &ngroups);
+
+    return sameGroup(buf.st_gid, groups, ngroups);
+
+}
+
+int main(int argc, char *argv[])
+{
+    // nom du fichier a effacer
+    char* file = argv[1];
+    char str[20];
+    // verifier que l'utilisateur et du meme groupe que le fichier
+    char * username = getenv("USER");
+    FILE* f;
+    
+    // if(check_groupID(file, username)==-1){
+    //     printf("Vous n'avez pas les droits pour supprimer ce fichier !");
+    // } else {
+        //printf("veuillez entrer votre mot de passe : ");
+        // demander a l'utilisateur son mdp
+        //fgets(str, 20, stdin);
+        //verifi du mdp
+        
+        f = fopen("test.txt", "r");
+        if(f==NULL){
+            printf("Impossible d'acceder au PWD");
+            exit(1);
+        }
+
+        char *oldPwd = NULL;
+        while (fgets(str, 20, f) != NULL )
+        {
+            //on retire le caractere \n de fgets
+            str[strcspn(str, "\n")] = 0;
+            if(strcmp("nico",str)==0){
+                oldPwd = str;
+                break;
+            }
+        }
+        if(oldPwd==NULL){
+            printf("pas trouvé");
+        } else {
+            printf("saisir votre ancien mot de passe: ");
+            fgets(str, 20, stdin);
+        }
+
+        fclose(f);
+
+        // supprimer le fichier
+        // appel a check_pass.c
+    // }
+
+    return 0;
+}