パスワードライブラリヘッダ More...

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

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Macros
#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.

Macro Definition Documentation

◆ LEN_DESPASS

#define LEN_DESPASS 13

Definition at line 51 of file password.h.

◆ LEN_DESSALT

#define LEN_DESSALT 2

Definition at line 52 of file password.h.

◆ LEN_DOLLAR2_SALT

#define LEN_DOLLAR2_SALT 29

Definition at line 45 of file password.h.

◆ LEN_DOLLAR5_SALT

#define LEN_DOLLAR5_SALT 20

Definition at line 46 of file password.h.

◆ LEN_DOLLAR6_SALT

#define LEN_DOLLAR6_SALT 20

Definition at line 47 of file password.h.

◆ LEN_DOLLAR_SALT

#define LEN_DOLLAR_SALT 12

Definition at line 44 of file password.h.

◆ LEN_MD5PASS

#define LEN_MD5PASS 34

Definition at line 49 of file password.h.

◆ LEN_MD5SALT

#define LEN_MD5SALT 12

Definition at line 50 of file password.h.

Function Documentation

◆ check_passwd()

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 248 of file password.c.

 {
     int   samepass=FALSE;
     char* salt;
  
     if (passwd==NULL || cryptpass==NULL) return FALSE;
  
 //  if (!strncmp("$1$", cryptpass, 3) && strlen(cryptpass)==LEN_MD5PASS) {
 //  if (cryptpass[0]=='$' && cryptpass[2]=='$' && cryptpass[11]=='$') {
     if (cryptpass[0]=='$') {
         int lsalt = 0;
         if      (cryptpass[1]=='1') lsalt = LEN_DOLLAR_SALT;
         else if (cryptpass[1]=='2') lsalt = LEN_DOLLAR2_SALT;
         else if (cryptpass[1]=='5') lsalt = LEN_DOLLAR5_SALT;
         else if (cryptpass[1]=='6') lsalt = LEN_DOLLAR6_SALT;
  
         if (lsalt!=0) {
             salt = cut_str(cryptpass, 0, lsalt-1);
             if (!strcmp(crypt(passwd, salt), cryptpass)) {
                 samepass = TRUE;
             }
             free(salt);
         }
     }
     else if (strlen(cryptpass)==LEN_DESPASS) {
         // DES
         salt = cut_str(cryptpass, 0, LEN_DESSALT-1);
         if (!strcmp(crypt(passwd, salt), cryptpass)) {
             samepass = TRUE;
         }
         free(salt);
     }
  
     return samepass;
 }

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

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◆ check_salt()

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 301 of file password.c.

 {
     int ret = -1;
     int len = strlen(passwd);
  
     if (LEN_DESPASS<len) {
         if (passwd[0]=='$' && passwd[2]=='$' && passwd[11]=='$') {
             ret = (short int)passwd[1] - (short int)'1' + 1;
         }
     }
     else if (LEN_DESPASS==len) {
         ret = 0;
     }
  
     return ret;
 }

References len, and LEN_DESPASS.

◆ free_pw()

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 167 of file password.c.

 {
     if (pw==NULL) return;
  
     freeNull(pw->pw_name);
     freeNull(pw->pw_passwd);
     freeNull(pw->pw_gecos);
     freeNull(pw->pw_dir);
     freeNull(pw->pw_shell);
     freeNull(pw);
     return;
 }

References freeNull.

Referenced by get_passwd().

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◆ get_passwd()

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 25 of file password.c.

 {
     struct passwd* pw;
     struct spwd*   sp;
     char*  pass;
  
     pass = (char*)malloc(LPASS+1);
     if (pass==NULL) return NULL;
     memset(pass, 0, LPASS+1);
  
     // for /etc/passwd
     pw = getpwnam((const char*)user_id);
     if (pw==NULL) {
         free(pass);
         return NULL;
     }
     strncpy(pass, pw->pw_passwd, LPASS);
     if (strcmp(pass, "*") && strcmp(pass, "x") && strcmp(pass, "!")) return pass;
  
 #ifdef HAVE_GETSPNAM
     // for /etc/shadow
     sp = getspnam((const char*)user_id);
     if (sp!=NULL) {
         strncpy(pass, sp->sp_pwdp, LPASS);
         return pass;
     }
 #endif
  
 #ifdef HAVE_RPCSVC_YPCLNT_H
     // for NIS
     pw = getnisnam(user_id);
     if (pw!=NULL) {
         strncpy(pass, pw->pw_passwd, LPASS);
         free_pw(pw);
         return pass;
     }
 #endif
  
     return pass;    // *, x, !
 }

References free_pw(), and LPASS.

Referenced by command_USERID().

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◆ x2crypt()

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 194 of file password.c.

 {
     char* cpass;
     char* dpass = NULL;
     char* csalt;
  
     if (pass==NULL || bsalt==NULL) return NULL;
  
     csalt = get_line(bsalt, 1);
     cpass = crypt(pass, csalt);
     freeNull(csalt);
     csalt = get_line(bsalt, 2);
     if (csalt==NULL) return NULL;
  
     if (cpass[0]=='$') {
         int lsalt = 0;
         if      (cpass[1]=='1') lsalt = LEN_DOLLAR_SALT;
         else if (cpass[1]=='2') lsalt = LEN_DOLLAR2_SALT;
         else if (cpass[1]=='5') lsalt = LEN_DOLLAR5_SALT;
         else if (cpass[1]=='6') lsalt = LEN_DOLLAR6_SALT;
  
         if (lsalt!=0) {
             int passlen = strlen(cpass);
             dpass = cut_str(cpass, lsalt, passlen-1);
             cpass = crypt(dpass, csalt);
             freeNull(dpass);
             dpass = cut_str(cpass, lsalt, passlen-1);
         }
     }
     else if (strlen(cpass)==LEN_DESPASS) {
         dpass = cut_str(cpass, LEN_DESSALT, LEN_DESPASS-1);
         freeNull(cpass);
         cpass = crypt(dpass, csalt);
         freeNull(dpass);
         dpass = cut_str(cpass, LEN_DESSALT, LEN_DESPASS-1);
     }
  
     freeNull(csalt);
     return dpass;
 }

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().

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Macros

Functions

Detailed Description

Macro Definition Documentation

◆ LEN_DESPASS

◆ LEN_DESSALT

◆ LEN_DOLLAR2_SALT

◆ LEN_DOLLAR5_SALT

◆ LEN_DOLLAR6_SALT

◆ LEN_DOLLAR_SALT

◆ LEN_MD5PASS

◆ LEN_MD5SALT

Function Documentation

◆ check_passwd()

◆ check_salt()

◆ free_pw()

◆ get_passwd()

◆ x2crypt()