Lib/password.h File Reference

パスワードライブラリ ヘッダ More...

#include "tools.h"
#include <pwd.h>
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Defines

#define LEN_DOLLAR_SALT   12
#define LEN_DOLLAR2_SALT   29
#define LEN_DOLLAR5_SALT   20
#define LEN_DOLLAR6_SALT   20
#define LEN_MD5PASS   34
#define LEN_MD5SALT   12
#define LEN_DESPASS   13
#define LEN_DESSALT   2

Functions

char * get_passwd (char *user_id)
void free_pw (struct passwd *pw)
int check_passwd (char *passwd, char *cryptpass)
int check_salt (char *passwd)
char * x2crypt (char *pass, char *salt)

Detailed Description

Author:
Fumi.Iseki (C)

Definition in file password.h.

Define Documentation

#define LEN_DESPASS   13

Definition at line 55 of file password.h.

Referenced by check_passwd(), check_salt(), command_PASSWD(), command_USERID(), and x2crypt().

#define LEN_DESSALT   2

Definition at line 56 of file password.h.

Referenced by check_passwd(), command_USERID(), and x2crypt().

#define LEN_DOLLAR2_SALT   29

Definition at line 49 of file password.h.

Referenced by check_passwd(), and x2crypt().

#define LEN_DOLLAR5_SALT   20

Definition at line 50 of file password.h.

Referenced by check_passwd(), command_PASSWD(), command_USERID(), and x2crypt().

#define LEN_DOLLAR6_SALT   20

Definition at line 51 of file password.h.

Referenced by check_passwd(), command_PASSWD(), command_USERID(), and x2crypt().

#define LEN_DOLLAR_SALT   12

Definition at line 48 of file password.h.

Referenced by check_passwd(), command_PASSWD(), command_USERID(), and x2crypt().

#define LEN_MD5PASS   34

Definition at line 53 of file password.h.

#define LEN_MD5SALT   12

Definition at line 54 of file password.h.

Function Documentation

int check_passwd ( char *  passwd,
char *  cryptpass 
)

int check_passwd(char* passwd, char* cryptpass)

生パスワード passwd と暗号化されたパスワード cryptass(salt付き)が同じものであるかどうかチェックする．
使用できる暗号化（ハッシュ値化）は DES と $#$（自動判別）

Parameters:
passwd 検査する生パスワード
cryptpass 比較対象のハッシュ値化されたパスワード
Return values:
TRUE 同じ
FALSE 違う

Definition at line 255 of file password.c.

References cut_str(), FALSE, LEN_DESPASS, LEN_DESSALT, LEN_DOLLAR2_SALT, LEN_DOLLAR5_SALT, LEN_DOLLAR6_SALT, LEN_DOLLAR_SALT, and TRUE.

00256 {
00257     int   samepass=FALSE;
00258     char* salt;
00259 
00260     if (passwd==NULL || cryptpass==NULL) return FALSE;
00261 
00262 //  if (!strncmp("$1$", cryptpass, 3) && strlen(cryptpass)==LEN_MD5PASS) {
00263 //  if (cryptpass[0]=='$' && cryptpass[2]=='$' && cryptpass[11]=='$') {
00264     if (cryptpass[0]=='$') {
00265         int lsalt = 0;
00266         if      (cryptpass[1]=='1') lsalt = LEN_DOLLAR_SALT;
00267         else if (cryptpass[1]=='2') lsalt = LEN_DOLLAR2_SALT;
00268         else if (cryptpass[1]=='5') lsalt = LEN_DOLLAR5_SALT;
00269         else if (cryptpass[1]=='6') lsalt = LEN_DOLLAR6_SALT;
00270 
00271         if (lsalt!=0) {
00272             salt = cut_str(cryptpass, 0, lsalt-1);
00273             if (!strcmp(crypt(passwd, salt), cryptpass)) {
00274                 samepass = TRUE;
00275             }
00276             free(salt);
00277         }
00278     }
00279     else if (strlen(cryptpass)==LEN_DESPASS) {
00280         // DES
00281         salt = cut_str(cryptpass, 0, LEN_DESSALT-1);
00282         if (!strcmp(crypt(passwd, salt), cryptpass)) {
00283             samepass = TRUE;
00284         }
00285         free(salt);
00286     }
00287 
00288     return samepass;
00289 }

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int check_salt ( char *  passwd  ) 

int check_salt(char* passwd)

パスワード passwd のsaltをチェックする

DES -- 0 $#$ -- # saltn無し -- -1

Parameters:
passwd チェックする文字列（パスワード）
Return values:
slat の種類
-1 saltが無い
0 DES
number $#$........$ の #

Definition at line 309 of file password.c.

References LEN_DESPASS.

00310 {
00311     int ret = -1;
00312     int len = strlen(passwd);
00313 
00314     if (LEN_DESPASS<len) {
00315         if (passwd[0]=='$' && passwd[2]=='$' && passwd[11]=='$') {
00316             ret = (short int)passwd[1] - (short int)'1' + 1;
00317         }
00318     }
00319     else if (LEN_DESPASS==len) {
00320         ret = 0;
00321     }
00322 
00323     return ret;
00324 }

void free_pw ( struct passwd *  pw  ) 

void free_pw(struct passwd* pw)

パスワード構造体 struct pw* を free する．getnisnam()の返す構造体にのみ適用すること．
一般のUNIXライブラリの返すパスワード構造体に対して適用してはいけない（セグメンテーションフォルトを起こす）．

Parameters:
pw 開放する struct pw型変数へのポインタ．
See also:
struct pw

Definition at line 172 of file password.c.

References freeNull.

Referenced by get_passwd().

00173 {
00174     if (pw==NULL) return;
00175 
00176     freeNull(pw->pw_name);
00177     freeNull(pw->pw_passwd);
00178     freeNull(pw->pw_gecos);
00179     freeNull(pw->pw_dir);
00180     freeNull(pw->pw_shell);
00181     freeNull(pw);
00182     return;
00183 }

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char* get_passwd ( char *  user_id  ) 

char* get_passwd(char* user_id)

ユーザ user_id のパスワードを得る．
パスワードの検索順は　/etc/passwd, /etc/shadow, NIS

Parameters:
user_id ユーザ名
Returns:
ユーザの暗号化（ハッシュ値化）されたパスワード
Return values:
NULL 失敗

Definition at line 27 of file password.c.

References free_pw(), and LPASS.

Referenced by command_USERID().

00028 {
00029     struct passwd* pw;
00030     struct spwd*   sp;
00031     char*  pass;
00032 
00033     pass = (char*)malloc(LPASS+1);
00034     if (pass==NULL) return NULL;
00035     memset(pass, 0, LPASS+1);
00036 
00037     // for /etc/passwd
00038     pw = getpwnam((const char*)user_id);
00039     if (pw==NULL) {
00040         free(pass);
00041         return NULL;
00042     }
00043     strncpy(pass, pw->pw_passwd, LPASS);
00044     if (strcmp(pass, "*") && strcmp(pass, "x") && strcmp(pass, "!")) return pass;
00045 
00046 #ifdef HAVE_GETSPNAM
00047     // for /etc/shadow
00048     sp = getspnam((const char*)user_id);
00049     if (sp!=NULL) {
00050         strncpy(pass, sp->sp_pwdp, LPASS);
00051         return pass;
00052     }
00053 #endif
00054 
00055 #ifdef HAVE_RPCSVC_YPCLNT_H
00056     // for NIS
00057     pw = getnisnam(user_id);
00058     if (pw!=NULL) {
00059         strncpy(pass, pw->pw_passwd, LPASS);
00060         free_pw(pw);
00061         return pass;
00062     }
00063 #endif
00064 
00065     return NULL;
00066 }

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char* x2crypt ( char *  pass,
char *  bsalt 
)

char* x2crypt(char* pass, char* bsalt)

pass を bsalt で2回暗号化（ハッシュ値化）する．
bsaltには改行コード(\nまたは \r\n)で区切られた2個のsaltが入っている必要がある．

Parameters:
pass ハッシュ値化するパスワード
bsalt 改行コード(\nまたは \r\n)で区切られた2個の salt．
Returns:
2度ハッシュ値化された文字列．要 free
Bug:
bsaltに 2個のslatが入っていなかったときの動作は? -> 不明

Definition at line 200 of file password.c.

References cut_str(), freeNull, get_line(), LEN_DESPASS, LEN_DESSALT, LEN_DOLLAR2_SALT, LEN_DOLLAR5_SALT, LEN_DOLLAR6_SALT, and LEN_DOLLAR_SALT.

Referenced by check_auth().

00201 {
00202     char* cpass;
00203     char* dpass = NULL;
00204     char* csalt;
00205 
00206     if (pass==NULL || bsalt==NULL) return NULL;
00207 
00208     csalt = get_line(bsalt, 1);
00209     cpass = crypt(pass, csalt);
00210     freeNull(csalt);
00211     csalt = get_line(bsalt, 2);
00212     if (csalt==NULL) return NULL;
00213 
00214     if (cpass[0]=='$') {
00215         int lsalt = 0;
00216         if      (cpass[1]=='1') lsalt = LEN_DOLLAR_SALT;
00217         else if (cpass[1]=='2') lsalt = LEN_DOLLAR2_SALT;
00218         else if (cpass[1]=='5') lsalt = LEN_DOLLAR5_SALT;
00219         else if (cpass[1]=='6') lsalt = LEN_DOLLAR6_SALT;
00220 
00221         if (lsalt!=0) {
00222             int passlen = strlen(cpass);
00223             dpass = cut_str(cpass, lsalt, passlen-1);
00224             cpass = crypt(dpass, csalt);
00225             freeNull(dpass);
00226             dpass = cut_str(cpass, lsalt, passlen-1);
00227         }
00228     }
00229     else if (strlen(cpass)==LEN_DESPASS) {
00230         dpass = cut_str(cpass, LEN_DESSALT, LEN_DESPASS-1);
00231         freeNull(cpass);
00232         cpass = crypt(dpass, csalt);
00233         freeNull(dpass);
00234         dpass = cut_str(cpass, LEN_DESSALT, LEN_DESPASS-1);
00235     }
00236 
00237     freeNull(csalt);
00238     return dpass;
00239 }

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