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Remove -lmd. Use dlopen() and dlsym() instead for calls to the MD5* and

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SHA* routines so that callers of libcrypt are not exposed to the internal
implementation.
This commit is contained in:
Peter Wemm 1999-12-17 20:04:01 +00:00
parent 3d4ae47516
commit 1f4aad4d1c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=54751
3 changed files with 91 additions and 5 deletions
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3
lib/libcrypt/Makefile
View File

@ -24,9 +24,6 @@ CFLAGS+= -I${.CURDIR}/../libmd
CFLAGS+= -DLIBC_SCCS -Wall
PRECIOUSLIB= yes
LDADD+= -lmd
DPADD+= ${LIBMD}
# Include this early to pick up the definitions of SHLIB_MAJOR and
# SHLIB_MINOR which are used in the existence tests.
.include "${.CURDIR}/../Makefile.inc"

45
lib/libcrypt/crypt-md5.c
View File

@ -11,15 +11,29 @@
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$FreeBSD$";
static const char rcsid[] = \
"$FreeBSD$";
#endif /* LIBC_SCCS and not lint */
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <md5.h>
#include <err.h>
#include "crypt.h"
#ifdef __PIC__
#include <dlfcn.h>
#define MD5Init(ctx) dl_MD5Init(ctx)
#define MD5Update(ctx, data, len) dl_MD5Update(ctx, data, len)
#define MD5Final(dgst, ctx) dl_MD5Final(dgst, ctx)
static void (*dl_MD5Init)(MD5_CTX *);
static void (*dl_MD5Update)(MD5_CTX *, const unsigned char *, unsigned int);
static void (*dl_MD5Final)(unsigned char digest[16], MD5_CTX *);
#endif
/*
* UNIX password
*/
@ -41,6 +55,9 @@ crypt_md5(pw, salt)
int sl,pl,i;
MD5_CTX ctx,ctx1;
unsigned long l;
#ifdef __PIC__
void *libmd;
#endif
/* Refine the Salt first */
sp = salt;
@ -56,6 +73,29 @@ crypt_md5(pw, salt)
/* get the length of the true salt */
sl = ep - sp;
#ifdef __PIC__
libmd = dlopen("libmd.so", RTLD_NOW);
if (libmd == NULL)
return NULL;
dl_MD5Init = dlsym(libmd, "MD5Init");
if (dl_MD5Init == NULL) {
warnx("libcrypt-md5: looking for MD5Init: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
dl_MD5Update = dlsym(libmd, "MD5Update");
if (dl_MD5Update == NULL) {
warnx("libcrypt-md5: looking for MD5Update: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
dl_MD5Final = dlsym(libmd, "MD5Final");
if (dl_MD5Final == NULL) {
warnx("libcrypt-md5: looking for MD5Final: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
#endif
MD5Init(&ctx);
/* The password first, since that is what is most unknown */
@ -118,6 +158,9 @@ crypt_md5(pw, salt)
MD5Final(final,&ctx1);
}
#ifdef __PIC__
dlclose(libmd);
#endif
p = passwd + strlen(passwd);
l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];

48
lib/libcrypt/crypt-shs.c
View File

@ -11,15 +11,29 @@
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$FreeBSD$";
static const char rcsid[] = \
"$FreeBSD$";
#endif /* LIBC_SCCS and not lint */
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sha.h>
#include <err.h>
#include "crypt.h"
#ifdef __PIC__
#include <dlfcn.h>
#define SHA_Init(ctx) dl_SHA_Init(ctx)
#define SHA_Update(ctx, data, len) dl_SHA_Update(ctx, data, len)
#define SHA_Final(dgst, ctx) dl_SHA_Final(dgst, ctx)
static void (*dl_SHA_Init)(SHA_CTX *);
static void (*dl_SHA_Update)(SHA_CTX *, const unsigned char *, unsigned int);
static void (*dl_SHA_Final)(unsigned char digest[20], SHA_CTX *);
#endif
/*
* UNIX password
*/
@ -41,6 +55,9 @@ crypt_sha(pw, salt)
int sl,pl,i;
SHA_CTX ctx,ctx1;
unsigned long l;
#ifdef __PIC__
void *libmd;
#endif
/* Refine the Salt first */
sp = salt;
@ -56,6 +73,32 @@ crypt_sha(pw, salt)
/* get the length of the true salt */
sl = ep - sp;
#ifdef __PIC__
libmd = dlopen("libmd.so", RTLD_NOW);
if (libmd == NULL)
return NULL;
dl_SHA_Init = dlsym(libmd, "SHA_Init");
if (dl_SHA_Init == NULL) {
warnx("libcrypt-md5: looking for SHA_Init: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
dl_SHA_Update = dlsym(libmd, "SHA_Update");
if (dl_SHA_Update == NULL) {
warnx("libcrypt-md5: looking for SHA_Update: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
dl_SHA_Final = dlsym(libmd, "SHA_Final");
if (dl_SHA_Final == NULL) {
warnx("libcrypt-md5: looking for SHA_Final: %s\n", dlerror());
dlclose(libmd);
return NULL;
}
#endif
SHA_Init(&ctx);
/* The password first, since that is what is most unknown */
SHA_Init(&ctx);
/* The password first, since that is what is most unknown */
@ -118,6 +161,9 @@ crypt_sha(pw, salt)
SHA_Final(final,&ctx1);
}
#ifdef __PIC__
dlclose(libmd);
#endif
p = passwd + strlen(passwd);
l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];