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Support RADIUS passwords up to 128 characters

Browse Source 
Previous limit was 16 characters, due to lack of support for multiple passes
of encryption.

Marko Tiikkaja
This commit is contained in:
Magnus Hagander 2015-09-06 14:26:33 +02:00
parent c314ead5be
commit 643beffe8f
1 changed files with 40 additions and 20 deletions
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48
src/backend/libpq/auth.c
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@ -2168,6 +2168,7 @@ CheckCertAuth(Port *port)
#define RADIUS_VECTOR_LENGTH 16
#define RADIUS_HEADER_LENGTH 20
#define RADIUS_MAX_PASSWORD_LENGTH 128
typedef struct
{
@ -2241,7 +2242,9 @@ CheckRADIUSAuth(Port *port)
radius_packet *receivepacket = (radius_packet *) receive_buffer;
int32 service = htonl(RADIUS_AUTHENTICATE_ONLY);
uint8 *cryptvector;
uint8 encryptedpassword[RADIUS_VECTOR_LENGTH];
int encryptedpasswordlen;
uint8 encryptedpassword[RADIUS_MAX_PASSWORD_LENGTH];
uint8 *md5trailer;
int packetlength;
pgsocket sock;
@ -2259,6 +2262,7 @@ CheckRADIUSAuth(Port *port)
fd_set fdset;
struct timeval endtime;
int i,
j,
r;
/* Make sure struct alignment is correct */
@ -2316,13 +2320,14 @@ CheckRADIUSAuth(Port *port)
return STATUS_ERROR;
}
if (strlen(passwd) > RADIUS_VECTOR_LENGTH)
if (strlen(passwd) > RADIUS_MAX_PASSWORD_LENGTH)
{
ereport(LOG,
(errmsg("RADIUS authentication does not support passwords longer than 16 characters")));
(errmsg("RADIUS authentication does not support passwords longer than %d characters", RADIUS_MAX_PASSWORD_LENGTH)));
return STATUS_ERROR;
}
/* Construct RADIUS packet */
packet->code = RADIUS_ACCESS_REQUEST;
packet->length = RADIUS_HEADER_LENGTH;
@ -2344,28 +2349,43 @@ CheckRADIUSAuth(Port *port)
radius_add_attribute(packet, RADIUS_NAS_IDENTIFIER, (unsigned char *) identifier, strlen(identifier));
/*
* RADIUS password attributes are calculated as: e[0] = p[0] XOR
* MD5(secret + vector)
* RADIUS password attributes are calculated as:
* e[0] = p[0] XOR MD5(secret + Request Authenticator)
* for the first group of 16 octets, and then:
* e[i] = p[i] XOR MD5(secret + e[i-1])
* for the following ones (if necessary)
*/
cryptvector = palloc(RADIUS_VECTOR_LENGTH + strlen(port->hba->radiussecret));
encryptedpasswordlen = ((strlen(passwd) + RADIUS_VECTOR_LENGTH - 1) / RADIUS_VECTOR_LENGTH) * RADIUS_VECTOR_LENGTH;
cryptvector = palloc(strlen(port->hba->radiussecret) + RADIUS_VECTOR_LENGTH);
memcpy(cryptvector, port->hba->radiussecret, strlen(port->hba->radiussecret));
memcpy(cryptvector + strlen(port->hba->radiussecret), packet->vector, RADIUS_VECTOR_LENGTH);
if (!pg_md5_binary(cryptvector, RADIUS_VECTOR_LENGTH + strlen(port->hba->radiussecret), encryptedpassword))
/* for the first iteration, we use the Request Authenticator vector */
md5trailer = packet->vector;
for (i = 0; i < encryptedpasswordlen; i += RADIUS_VECTOR_LENGTH)
{
memcpy(cryptvector + strlen(port->hba->radiussecret), md5trailer, RADIUS_VECTOR_LENGTH);
/* .. and for subsequent iterations the result of the previous XOR (calculated below) */
md5trailer = encryptedpassword + i;
if (!pg_md5_binary(cryptvector, strlen(port->hba->radiussecret) + RADIUS_VECTOR_LENGTH, encryptedpassword + i))
{
ereport(LOG,
(errmsg("could not perform MD5 encryption of password")));
pfree(cryptvector);
return STATUS_ERROR;
}
pfree(cryptvector);
for (i = 0; i < RADIUS_VECTOR_LENGTH; i++)
for (j = i; j < i+RADIUS_VECTOR_LENGTH; j++)
{
if (i < strlen(passwd))
encryptedpassword[i] = passwd[i] ^ encryptedpassword[i];
if (j < strlen(passwd))
encryptedpassword[j] = passwd[j] ^ encryptedpassword[j];
else
encryptedpassword[i] = '\0' ^ encryptedpassword[i];
encryptedpassword[j] = '\0' ^ encryptedpassword[j];
}
radius_add_attribute(packet, RADIUS_PASSWORD, encryptedpassword, RADIUS_VECTOR_LENGTH);
}
pfree(cryptvector);
radius_add_attribute(packet, RADIUS_PASSWORD, encryptedpassword, encryptedpasswordlen);
/* Length need to be in network order on the wire */
packetlength = packet->length;