remove built-in support for md5crypt()
Users of MD5-hashed password should arrange for ./configure to link against libxcrypt or similar. Though it would be better to avoid use of MD5 password hashing entirely, it's arguably worse than DEScrypt. feedback and ok dtucker@
This commit is contained in:
Damien Miller
parent
c5de1fffa6
commit
a5ab488234
5
INSTALL
5
INSTALL
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@ -197,11 +197,6 @@ it if lastlog is installed in a different place.
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--with-osfsia, --without-osfsia will enable or disable OSF1's Security
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Integration Architecture. The default for OSF1 machines is enable.
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--with-md5-passwords will enable the use of MD5 passwords. Enable this
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if your operating system uses MD5 passwords and the system crypt() does
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not support them directly (see the crypt(3/3c) man page). If enabled, the
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resulting binary will support both MD5 and traditional crypt passwords.
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--with-utmpx enables utmpx support. utmpx support is automatic for
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some platforms.
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12
LICENCE
12
LICENCE
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@ -210,22 +210,14 @@ OpenSSH contains no GPL code.
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8) Portable OpenSSH contains the following additional licenses:
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a) md5crypt.c, md5crypt.h
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this
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* notice you can do whatever you want with this stuff. If we meet
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* some day, and you think this stuff is worth it, you can buy me a
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* beer in return. Poul-Henning Kamp
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b) snprintf replacement
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a) snprintf replacement
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* Copyright Patrick Powell 1995
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* This code is based on code written by Patrick Powell
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* (papowell@astart.com) It may be used for any purpose as long as this
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* notice remains intact on all source code distributions
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c) Compatibility code (openbsd-compat)
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b) Compatibility code (openbsd-compat)
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Apart from the previously mentioned licenses, various pieces of code
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in the openbsd-compat/ subdirectory are licensed as follows:
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@ -127,7 +127,7 @@ SSHDOBJS=sshd.o auth-rhosts.o auth-passwd.o \
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auth2-none.o auth2-passwd.o auth2-pubkey.o \
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monitor.o monitor_wrap.o auth-krb5.o \
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auth2-gss.o gss-serv.o gss-serv-krb5.o \
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loginrec.o auth-pam.o auth-shadow.o auth-sia.o md5crypt.o \
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loginrec.o auth-pam.o auth-shadow.o auth-sia.o \
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srclimit.o sftp-server.o sftp-common.o \
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sandbox-null.o sandbox-rlimit.o sandbox-systrace.o sandbox-darwin.o \
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sandbox-seccomp-filter.o sandbox-capsicum.o sandbox-pledge.o \
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15
configure.ac
15
configure.ac
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@ -1859,7 +1859,6 @@ AC_CHECK_FUNCS([ \
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localtime_r \
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login_getcapbool \
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login_getpwclass \
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md5_crypt \
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memmem \
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memmove \
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memset_s \
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@ -4943,19 +4942,6 @@ else
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fi
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AC_SUBST([mansubdir])
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# Check whether to enable MD5 passwords
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MD5_MSG="no"
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AC_ARG_WITH([md5-passwords],
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[ --with-md5-passwords Enable use of MD5 passwords],
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[
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if test "x$withval" != "xno" ; then
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AC_DEFINE([HAVE_MD5_PASSWORDS], [1],
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[Define if you want to allow MD5 passwords])
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MD5_MSG="yes"
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fi
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]
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)
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# Whether to disable shadow password support
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AC_ARG_WITH([shadow],
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[ --without-shadow Disable shadow password support],
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@ -5550,7 +5536,6 @@ echo " PAM support: $PAM_MSG"
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echo " OSF SIA support: $SIA_MSG"
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echo " KerberosV support: $KRB5_MSG"
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echo " SELinux support: $SELINUX_MSG"
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echo " MD5 password support: $MD5_MSG"
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echo " libedit support: $LIBEDIT_MSG"
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echo " libldns support: $LDNS_MSG"
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echo " Solaris process contract support: $SPC_MSG"
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@ -66,7 +66,7 @@
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# rpm -ba|--rebuild --define "smartcard 1"
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%{?smartcard:%global scard 1}
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# Is this a build for the rescue CD (without PAM, with MD5)? (1=yes 0=no)
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# Is this a build for the rescue CD (without PAM)? (1=yes 0=no)
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%global rescue 0
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%{?build_rescue:%global rescue 1}
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@ -211,7 +211,6 @@ CFLAGS="$RPM_OPT_FLAGS -Os"; export CFLAGS
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--with-default-path=/usr/local/bin:/bin:/usr/bin \
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--with-superuser-path=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin \
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--with-privsep-path=%{_var}/empty/sshd \
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--with-md5-passwords \
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--mandir=%{_mandir} \
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--with-mantype=man \
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--disable-strip \
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@ -424,7 +423,10 @@ fi
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%endif
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%changelog
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* Mon Jul 20 2020 Damien Miller <djm@mindrto.org>
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* Thu Oct 28 2021 Damien Miller <djm@mindrot.org>
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- Remove remaining traces of --with-md5-passwords
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* Mon Jul 20 2020 Damien Miller <djm@mindrot.org>
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- Add ssh-sk-helper and corresponding manual page.
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* Sat Feb 10 2018 Darren Tucker <dtucker@dtucker.net>
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165
md5crypt.c
165
md5crypt.c
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@ -1,165 +0,0 @@
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this
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* notice you can do whatever you want with this stuff. If we meet some
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* day, and you think this stuff is worth it, you can buy me a beer in
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* return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#include "includes.h"
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#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
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#include <sys/types.h>
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#include <string.h>
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#include <openssl/md5.h>
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/* 0 ... 63 => ascii - 64 */
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static unsigned char itoa64[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static char *magic = "$1$";
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static char *
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to64(unsigned long v, int n)
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{
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static char buf[5];
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char *s = buf;
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if (n > 4)
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return (NULL);
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memset(buf, '\0', sizeof(buf));
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while (--n >= 0) {
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*s++ = itoa64[v&0x3f];
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v >>= 6;
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}
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return (buf);
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}
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int
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is_md5_salt(const char *salt)
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{
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return (strncmp(salt, magic, strlen(magic)) == 0);
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}
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char *
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md5_crypt(const char *pw, const char *salt)
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{
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static char passwd[120], salt_copy[9];
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static const char *sp, *ep;
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unsigned char final[16];
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int sl, pl, i, j;
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MD5_CTX ctx, ctx1;
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unsigned long l;
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/* Refine the Salt first */
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sp = salt;
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/* If it starts with the magic string, then skip that */
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if(strncmp(sp, magic, strlen(magic)) == 0)
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sp += strlen(magic);
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/* It stops at the first '$', max 8 chars */
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for (ep = sp; *ep != '$'; ep++) {
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if (*ep == '\0' || ep >= (sp + 8))
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return (NULL);
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}
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/* get the length of the true salt */
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sl = ep - sp;
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/* Stash the salt */
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memcpy(salt_copy, sp, sl);
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salt_copy[sl] = '\0';
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MD5_Init(&ctx);
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/* The password first, since that is what is most unknown */
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MD5_Update(&ctx, pw, strlen(pw));
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/* Then our magic string */
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MD5_Update(&ctx, magic, strlen(magic));
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/* Then the raw salt */
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MD5_Update(&ctx, sp, sl);
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/* Then just as many characters of the MD5(pw, salt, pw) */
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MD5_Init(&ctx1);
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MD5_Update(&ctx1, pw, strlen(pw));
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MD5_Update(&ctx1, sp, sl);
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MD5_Update(&ctx1, pw, strlen(pw));
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MD5_Final(final, &ctx1);
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for(pl = strlen(pw); pl > 0; pl -= 16)
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MD5_Update(&ctx, final, pl > 16 ? 16 : pl);
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/* Don't leave anything around in vm they could use. */
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memset(final, '\0', sizeof final);
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/* Then something really weird... */
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for (j = 0, i = strlen(pw); i != 0; i >>= 1)
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if (i & 1)
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MD5_Update(&ctx, final + j, 1);
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else
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MD5_Update(&ctx, pw + j, 1);
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/* Now make the output string */
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snprintf(passwd, sizeof(passwd), "%s%s$", magic, salt_copy);
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MD5_Final(final, &ctx);
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/*
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* and now, just to make sure things don't run too fast
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* On a 60 Mhz Pentium this takes 34 msec, so you would
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* need 30 seconds to build a 1000 entry dictionary...
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*/
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for(i = 0; i < 1000; i++) {
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MD5_Init(&ctx1);
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if (i & 1)
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MD5_Update(&ctx1, pw, strlen(pw));
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else
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MD5_Update(&ctx1, final, 16);
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if (i % 3)
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MD5_Update(&ctx1, sp, sl);
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if (i % 7)
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MD5_Update(&ctx1, pw, strlen(pw));
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if (i & 1)
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MD5_Update(&ctx1, final, 16);
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else
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MD5_Update(&ctx1, pw, strlen(pw));
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MD5_Final(final, &ctx1);
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}
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l = (final[ 0]<<16) | (final[ 6]<<8) | final[12];
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strlcat(passwd, to64(l, 4), sizeof(passwd));
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l = (final[ 1]<<16) | (final[ 7]<<8) | final[13];
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strlcat(passwd, to64(l, 4), sizeof(passwd));
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l = (final[ 2]<<16) | (final[ 8]<<8) | final[14];
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strlcat(passwd, to64(l, 4), sizeof(passwd));
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l = (final[ 3]<<16) | (final[ 9]<<8) | final[15];
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strlcat(passwd, to64(l, 4), sizeof(passwd));
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l = (final[ 4]<<16) | (final[10]<<8) | final[ 5];
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strlcat(passwd, to64(l, 4), sizeof(passwd));
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l = final[11] ;
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strlcat(passwd, to64(l, 2), sizeof(passwd));
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/* Don't leave anything around in vm they could use. */
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memset(final, 0, sizeof(final));
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memset(salt_copy, 0, sizeof(salt_copy));
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memset(&ctx, 0, sizeof(ctx));
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memset(&ctx1, 0, sizeof(ctx1));
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(void)to64(0, 4);
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return (passwd);
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}
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#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
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22
md5crypt.h
22
md5crypt.h
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@ -1,22 +0,0 @@
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*/
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#ifndef _MD5CRYPT_H
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#define _MD5CRYPT_H
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#include "config.h"
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#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
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int is_md5_salt(const char *);
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char *md5_crypt(const char *, const char *);
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#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
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#endif /* MD5CRYPT_H */
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@ -54,10 +54,6 @@
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# include <pwdadj.h>
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# endif
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# if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
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# include "md5crypt.h"
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# endif
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# if defined(WITH_OPENSSL) && !defined(HAVE_CRYPT) && defined(HAVE_DES_CRYPT)
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# include <openssl/des.h>
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# define crypt DES_crypt
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@ -108,12 +104,7 @@ xcrypt(const char *password, const char *salt)
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if (salt == NULL)
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salt = pick_salt();
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# ifdef HAVE_MD5_PASSWORDS
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if (is_md5_salt(salt))
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crypted = md5_crypt(password, salt);
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else
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crypted = crypt(password, salt);
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# elif defined(__hpux) && !defined(HAVE_SECUREWARE)
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#if defined(__hpux) && !defined(HAVE_SECUREWARE)
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if (iscomsec())
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crypted = bigcrypt(password, salt);
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else
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