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Remove support for (insecure) crypt authentication. 

This breaks compatibility with pre-7.2 versions.
This commit is contained in:
Magnus Hagander 2008-10-28 12:10:44 +00:00
parent ba4eb01554
commit 53a5026b5c
13 changed files with 30 additions and 200 deletions
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37
doc/src/sgml/client-auth.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/client-auth.sgml,v 1.109 2008/10/23 13:31:09 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/client-auth.sgml,v 1.110 2008/10/28 12:10:42 mha Exp $ -->
<chapter id="client-authentication">
<title>Client Authentication</title>
@ -315,24 +315,6 @@ hostnossl <replaceable>database</replaceable> <replaceable>user</replaceable>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>crypt</></term>
<listitem>
<note>
<para>
This option is recommended only for communicating with pre-7.2
clients.
</para>
</note>
<para>
Require the client to supply a <function>crypt()</>-encrypted
password for authentication.
<literal>md5</literal> is now recommended over <literal>crypt</>.
See <xref linkend="auth-password"> for details.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>password</></term>
<listitem>
@ -704,9 +686,6 @@ omicron bryanh guest1
<indexterm>
<primary>MD5</>
</indexterm>
<indexterm>
<primary>crypt</>
</indexterm>
<indexterm>
<primary>password</primary>
<secondary>authentication</secondary>
@ -714,21 +693,15 @@ omicron bryanh guest1
<para>
The password-based authentication methods are <literal>md5</>,
<literal>crypt</>, and <literal>password</>. These methods operate
and <literal>password</>. These methods operate
similarly except for the way that the password is sent across the
connection: respectively, MD5-hashed, crypt-encrypted, and clear-text.
A limitation is that the <literal>crypt</> method does not work with
passwords that have been encrypted in <structname>pg_authid</structname>.
connection: respectively, MD5-hashed and clear-text.
</para>
<para>
If you are at all concerned about password
<quote>sniffing</> attacks then <literal>md5</> is preferred, with
<literal>crypt</> to be used only if you must support pre-7.2
clients. Plain <literal>password</> should be avoided especially for
connections over the open Internet (unless you use <acronym>SSL</acronym>,
<acronym>SSH</>, or another
communications security wrapper around the connection).
<quote>sniffing</> attacks then <literal>md5</> is preferred.
Plain <literal>password</> should always be avoided if possible.
</para>
<para>

70
doc/src/sgml/protocol.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.73 2008/02/08 18:18:05 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/protocol.sgml,v 1.74 2008/10/28 12:10:42 mha Exp $ -->
<chapter id="protocol">
<title>Frontend/Backend Protocol</title>
@ -295,19 +295,6 @@
</listitem>
</varlistentry>
<varlistentry>
<term>AuthenticationCryptPassword</term>
<listitem>
<para>
The frontend must now send a PasswordMessage containing the
password encrypted via crypt(3), using the 2-character salt
specified in the AuthenticationCryptPassword message. If
this is the correct password, the server responds with an
AuthenticationOk, otherwise it responds with an ErrorResponse.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>AuthenticationMD5Password</term>
<listitem>
@ -1531,61 +1518,6 @@ AuthenticationCleartextPassword (B)
</varlistentry>
<varlistentry>
<term>
AuthenticationCryptPassword (B)
</term>
<listitem>
<para>
<variablelist>
<varlistentry>
<term>
Byte1('R')
</term>
<listitem>
<para>
Identifies the message as an authentication request.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Int32(10)
</term>
<listitem>
<para>
Length of message contents in bytes, including self.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Int32(4)
</term>
<listitem>
<para>
Specifies that a crypt()-encrypted password is required.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
Byte2
</term>
<listitem>
<para>
The salt to use when encrypting the password.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
AuthenticationMD5Password (B)

6
doc/src/sgml/user-manag.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/user-manag.sgml,v 1.40 2008/09/08 00:47:40 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/user-manag.sgml,v 1.41 2008/10/28 12:10:42 mha Exp $ -->
<chapter id="user-manag">
<title>Database Roles and Privileges</title>
@ -215,8 +215,8 @@ CREATE USER <replaceable>name</replaceable>;
<para>
A password is only significant if the client authentication
method requires the user to supply a password when connecting
to the database. The <option>password</>,
<option>md5</>, and <option>crypt</> authentication methods
to the database. The <option>password</> and
<option>md5</> authentication methods
make use of passwords. Database passwords are separate from
operating system passwords. Specify a password upon role
creation with <literal>CREATE ROLE

10
src/backend/libpq/auth.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.169 2008/10/23 13:31:10 mha Exp $
* $PostgreSQL: pgsql/src/backend/libpq/auth.c,v 1.170 2008/10/28 12:10:43 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -230,7 +230,6 @@ auth_failed(Port *port, int status)
errstr = gettext_noop("Ident authentication failed for user \"%s\"");
break;
case uaMD5:
case uaCrypt:
case uaPassword:
errstr = gettext_noop("password authentication failed for user \"%s\"");
break;
@ -373,11 +372,6 @@ ClientAuthentication(Port *port)
status = recv_and_check_password_packet(port);
break;
case uaCrypt:
sendAuthRequest(port, AUTH_REQ_CRYPT);
status = recv_and_check_password_packet(port);
break;
case uaPassword:
sendAuthRequest(port, AUTH_REQ_PASSWORD);
status = recv_and_check_password_packet(port);
@ -426,8 +420,6 @@ sendAuthRequest(Port *port, AuthRequest areq)
/* Add the salt for encrypted passwords. */
if (areq == AUTH_REQ_MD5)
pq_sendbytes(&buf, port->md5Salt, 4);
else if (areq == AUTH_REQ_CRYPT)
pq_sendbytes(&buf, port->cryptSalt, 2);
#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)

18
src/backend/libpq/crypt.c
View File

@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/libpq/crypt.c,v 1.75 2008/09/15 12:32:56 mha Exp $
* $PostgreSQL: pgsql/src/backend/libpq/crypt.c,v 1.76 2008/10/28 12:10:43 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,14 +53,6 @@ md5_crypt_verify(const Port *port, const char *role, char *client_pass)
if (shadow_pass == NULL || *shadow_pass == '\0')
return STATUS_ERROR;
/* We can't do crypt with MD5 passwords */
if (isMD5(shadow_pass) && port->hba->auth_method == uaCrypt)
{
ereport(LOG,
(errmsg("cannot use authentication method \"crypt\" because password is MD5-encrypted")));
return STATUS_ERROR;
}
/*
* Compare with the encrypted or plain password depending on the
* authentication method being used for this connection.
@ -106,14 +98,6 @@ md5_crypt_verify(const Port *port, const char *role, char *client_pass)
pfree(crypt_pwd2);
}
break;
case uaCrypt:
{
char salt[3];
strlcpy(salt, port->cryptSalt, sizeof(salt));
crypt_pwd = crypt(shadow_pass, salt);
break;
}
default:
if (isMD5(shadow_pass))
{

4
src/backend/libpq/hba.c
View File

@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.171 2008/10/27 20:04:45 mha Exp $
* $PostgreSQL: pgsql/src/backend/libpq/hba.c,v 1.172 2008/10/28 12:10:43 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -847,8 +847,6 @@ parse_hba_line(List *line, int line_num, HbaLine *parsedline)
parsedline->auth_method = uaReject;
else if (strcmp(token, "md5") == 0)
parsedline->auth_method = uaMD5;
else if (strcmp(token, "crypt") == 0)
parsedline->auth_method = uaCrypt;
else if (strcmp(token, "pam") == 0)
#ifdef USE_PAM
parsedline->auth_method = uaPAM;

41
src/backend/postmaster/postmaster.c
View File

@ -37,7 +37,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.565 2008/09/23 20:35:38 momjian Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.566 2008/10/28 12:10:43 mha Exp $
*
* NOTES
*
@ -323,7 +323,7 @@ static int initMasks(fd_set *rmask);
static void report_fork_failure_to_client(Port *port, int errnum);
static enum CAC_state canAcceptConnections(void);
static long PostmasterRandom(void);
static void RandomSalt(char *cryptSalt, char *md5Salt);
static void RandomSalt(char *md5Salt);
static void signal_child(pid_t pid, int signal);
static void SignalSomeChildren(int signal, bool only_autovac);
@ -1808,7 +1808,7 @@ ConnCreate(int serverFd)
* fork, not after. Else the postmaster's random sequence won't get
* advanced, and all backends would end up using the same salt...
*/
RandomSalt(port->cryptSalt, port->md5Salt);
RandomSalt(port->md5Salt);
}
/*
@ -3910,49 +3910,20 @@ dummy_handler(SIGNAL_ARGS)
{
}
/*
* CharRemap: given an int in range 0..61, produce textual encoding of it
* per crypt(3) conventions.
*/
static char
CharRemap(long ch)
{
if (ch < 0)
ch = -ch;
ch = ch % 62;
if (ch < 26)
return 'A' + ch;
ch -= 26;
if (ch < 26)
return 'a' + ch;
ch -= 26;
return '0' + ch;
}
/*
* RandomSalt
*/
static void
RandomSalt(char *cryptSalt, char *md5Salt)
RandomSalt(char *md5Salt)
{
long rand = PostmasterRandom();
cryptSalt[0] = CharRemap(rand % 62);
cryptSalt[1] = CharRemap(rand / 62);
long rand;
/*
* It's okay to reuse the first random value for one of the MD5 salt
* bytes, since only one of the two salts will be sent to the client.
* After that we need to compute more random bits.
*
* We use % 255, sacrificing one possible byte value, so as to ensure that
* all bits of the random() value participate in the result. While at it,
* add one to avoid generating any null bytes.
*/
rand = PostmasterRandom();
md5Salt[0] = (rand % 255) + 1;
rand = PostmasterRandom();
md5Salt[1] = (rand % 255) + 1;

3
src/include/libpq/hba.h
View File

@ -4,7 +4,7 @@
* Interface to hba.c
*
*
* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.50 2008/10/23 13:31:10 mha Exp $
* $PostgreSQL: pgsql/src/include/libpq/hba.h,v 1.51 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,7 +22,6 @@ typedef enum UserAuth
uaTrust,
uaIdent,
uaPassword,
uaCrypt,
uaMD5,
uaGSS,
uaSSPI,

3
src/include/libpq/libpq-be.h
View File

@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/libpq/libpq-be.h,v 1.67 2008/09/15 12:32:57 mha Exp $
* $PostgreSQL: pgsql/src/include/libpq/libpq-be.h,v 1.68 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -123,7 +123,6 @@ typedef struct Port
*/
HbaLine *hba;
char md5Salt[4]; /* Password salt */
char cryptSalt[2]; /* Password salt */
/*
* Information that really has no business at all being in struct Port,

4
src/include/libpq/pqcomm.h
View File

@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/libpq/pqcomm.h,v 1.108 2008/01/01 19:45:58 momjian Exp $
* $PostgreSQL: pgsql/src/include/libpq/pqcomm.h,v 1.109 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -153,7 +153,7 @@ extern bool Db_user_namespace;
#define AUTH_REQ_KRB4 1 /* Kerberos V4. Not supported any more. */
#define AUTH_REQ_KRB5 2 /* Kerberos V5 */
#define AUTH_REQ_PASSWORD 3 /* Password */
#define AUTH_REQ_CRYPT 4 /* crypt password */
#define AUTH_REQ_CRYPT 4 /* crypt password. Not supported any more. */
#define AUTH_REQ_MD5 5 /* md5 password */
#define AUTH_REQ_SCM_CREDS 6 /* transfer SCM credentials */
#define AUTH_REQ_GSS 7 /* GSSAPI without wrap() */

20
src/interfaces/libpq/fe-auth.c
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-auth.c,v 1.137 2008/01/31 18:58:30 tgl Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-auth.c,v 1.138 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -40,10 +40,6 @@
#include <pwd.h>
#endif
#ifdef HAVE_CRYPT_H
#include <crypt.h>
#endif
#include "libpq-fe.h"
#include "fe-auth.h"
#include "libpq/md5.h"
@ -787,14 +783,6 @@ pg_password_sendauth(PGconn *conn, const char *password, AuthRequest areq)
}
break;
}
case AUTH_REQ_CRYPT:
{
char salt[3];
strlcpy(salt, conn->cryptSalt, sizeof(salt));
crypt_pwd = crypt(password, salt);
break;
}
case AUTH_REQ_PASSWORD:
/* discard const so we can assign it */
crypt_pwd = (char *) password;
@ -938,8 +926,12 @@ pg_fe_sendauth(AuthRequest areq, PGconn *conn)
#endif
case AUTH_REQ_MD5:
case AUTH_REQ_CRYPT:
printfPQExpBuffer(&conn->errorMessage,
libpq_gettext("Crypt authentication not supported\n"));
return STATUS_ERROR;
case AUTH_REQ_MD5:
case AUTH_REQ_PASSWORD:
conn->password_needed = true;
if (conn->pgpass == NULL || conn->pgpass[0] == '\0')

11
src/interfaces/libpq/fe-connect.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.364 2008/10/27 09:42:31 mha Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.365 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -1674,15 +1674,6 @@ keep_going: /* We will come back to here until there is
return PGRES_POLLING_READING;
}
}
if (areq == AUTH_REQ_CRYPT)
{
if (pqGetnchar(conn->cryptSalt,
sizeof(conn->cryptSalt), conn))
{
/* We'll come back when there are more data */
return PGRES_POLLING_READING;
}
}
#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)
/*

3
src/interfaces/libpq/libpq-int.h
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.135 2008/10/27 09:42:31 mha Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.136 2008/10/28 12:10:44 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -340,7 +340,6 @@ struct pg_conn
int be_pid; /* PID of backend --- needed for cancels */
int be_key; /* key of backend --- needed for cancels */
char md5Salt[4]; /* password salt received from backend */
char cryptSalt[2]; /* password salt received from backend */
pgParameterStatus *pstatus; /* ParameterStatus data */
int client_encoding; /* encoding id */
bool std_strings; /* standard_conforming_strings */