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Support EAP auth with RADIUS server for SEVPN

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This commit is contained in:
Yihong Wu 2023-02-24 13:05:34 +00:00
parent e20fa9ec2e
commit e81ecbb0ec
3 changed files with 86 additions and 41 deletions
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1
src/Cedar/Proto_PPP.h
View File

@ -413,6 +413,7 @@ bool PPPParseUsername(CEDAR *cedar, char *src, ETHERIP_ID *dst);
void GenerateNtPasswordHash(UCHAR *dst, char *password);
void GenerateNtPasswordHashHash(UCHAR *dst_hash, UCHAR *src_hash);
void MsChapV2Server_GenerateChallenge(UCHAR *dst);
void MsChapV2Client_GenerateChallenge(UCHAR *dst);
void MsChapV2_GenerateChallenge8(UCHAR *dst, UCHAR *client_challenge, UCHAR *server_challenge, char *username);
void MsChapV2Client_GenerateResponse(UCHAR *dst, UCHAR *challenge8, UCHAR *nt_password_hash);
void MsChapV2Server_GenerateResponse(UCHAR *dst, UCHAR *nt_password_hash_hash, UCHAR *client_response, UCHAR *challenge8);

35
src/Cedar/Protocol.c
View File

@ -1914,7 +1914,7 @@ bool ServerAccept(CONNECTION *c)
if (auth_ret == false)
{
// Attempt external authentication registered users
// Attempt external authentication
bool fail_ext_user_auth = false;
if (GetGlobalServerFlag(GSF_DISABLE_RADIUS_AUTH) != 0)
{
@ -1923,7 +1923,7 @@ bool ServerAccept(CONNECTION *c)
if (fail_ext_user_auth == false)
{
auth_ret = SamAuthUserByPlainPassword(c, hub, username, plain_password, false, mschap_v2_server_response_20, &radius_login_opt);
auth_ret = SamAuthUserByPlainPassword(c, hub, username, plain_password, true, mschap_v2_server_response_20, &radius_login_opt);
}
if (auth_ret && pol == NULL)
@ -1932,37 +1932,6 @@ bool ServerAccept(CONNECTION *c)
}
}
if (auth_ret == false)
{
// Attempt external authentication asterisk user
bool b = false;
bool fail_ext_user_auth = false;
if (GetGlobalServerFlag(GSF_DISABLE_RADIUS_AUTH) != 0)
{
fail_ext_user_auth = true;
}
if (fail_ext_user_auth == false)
{
AcLock(hub);
{
b = AcIsUser(hub, "*");
}
AcUnlock(hub);
// If there is asterisk user, log on as the user
if (b)
{
auth_ret = SamAuthUserByPlainPassword(c, hub, username, plain_password, true, mschap_v2_server_response_20, &radius_login_opt);
if (auth_ret && pol == NULL)
{
pol = SamGetUserPolicy(hub, "*");
}
}
}
}
if (pol != NULL)
{
no_save_password = pol->NoSavePassword;

91
src/Cedar/Sam.c
View File

@ -9,6 +9,7 @@
#include "Account.h"
#include "Cedar.h"
#include "Connection.h"
#include "Hub.h"
#include "IPC.h"
#include "Proto_PPP.h"
@ -420,7 +421,7 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
bool auth_by_nt = false;
HUB *h;
// Validate arguments
if (hub == NULL || c == NULL || username == NULL)
if (hub == NULL || c == NULL || username == NULL || password == NULL || opt == NULL)
{
return false;
}
@ -438,7 +439,14 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
AcLock(hub);
{
USER *u;
u = AcGetUser(hub, ast == false ? username : "*");
// Find exact user first
u = AcGetUser(hub, username);
if (u == NULL && ast)
{
u = AcGetUser(hub, "*");
}
if (u)
{
Lock(u->lock);
@ -447,7 +455,7 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
{
// Radius authentication
AUTHRADIUS *auth = (AUTHRADIUS *)u->AuthData;
if (ast || auth->RadiusUsername == NULL || UniStrLen(auth->RadiusUsername) == 0)
if (auth->RadiusUsername == NULL || UniStrLen(auth->RadiusUsername) == 0)
{
if( IsEmptyStr(h->RadiusRealm) == false )
{
@ -472,7 +480,7 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
{
// NT authentication
AUTHNT *auth = (AUTHNT *)u->AuthData;
if (ast || auth->NtUsername == NULL || UniStrLen(auth->NtUsername) == 0)
if (auth->NtUsername == NULL || UniStrLen(auth->NtUsername) == 0)
{
name = CopyStrToUni(username);
}
@ -508,10 +516,75 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
char suffix_filter[MAX_SIZE];
wchar_t suffix_filter_w[MAX_SIZE];
UINT interval;
EAP_CLIENT *eap = NULL;
char password1[MAX_SIZE];
UCHAR client_challenge[16];
UCHAR server_challenge[16];
UCHAR challenge8[8];
UCHAR client_response[24];
UCHAR ntlm_hash[MD5_SIZE];
Zero(suffix_filter, sizeof(suffix_filter));
Zero(suffix_filter_w, sizeof(suffix_filter_w));
// MSCHAPv2 / EAP wrapper for SEVPN
if (c->IsInProc == false && StartWith(password, IPC_PASSWORD_MSCHAPV2_TAG) == false)
{
char client_ip_str[MAX_SIZE];
char utf8[MAX_SIZE];
// Convert the user name to a Unicode string
UniToStr(utf8, sizeof(utf8), name);
utf8[MAX_SIZE-1] = 0;
Zero(client_ip_str, sizeof(client_ip_str));
if (c != NULL && c->FirstSock != NULL)
{
IPToStr(client_ip_str, sizeof(client_ip_str), &c->FirstSock->RemoteIP);
}
if (hub->RadiusConvertAllMsChapv2AuthRequestToEap)
{
// Do EAP or PEAP
eap = HubNewEapClient(hub->Cedar, hub->Name, client_ip_str, utf8, opt->In_VpnProtocolState);
// Prepare MSCHAP response and replace plain password
if (eap != NULL)
{
char server_challenge_hex[MAX_SIZE];
char client_challenge_hex[MAX_SIZE];
char client_response_hex[MAX_SIZE];
char eap_client_hex[64];
MsChapV2Client_GenerateChallenge(client_challenge);
GenerateNtPasswordHash(ntlm_hash, password);
Copy(server_challenge, eap->MsChapV2Challenge.Chap_ChallengeValue, 16);
MsChapV2_GenerateChallenge8(challenge8, client_challenge, server_challenge, utf8);
MsChapV2Client_GenerateResponse(client_response, challenge8, ntlm_hash);
BinToStr(server_challenge_hex, sizeof(server_challenge_hex),
server_challenge, sizeof(server_challenge));
BinToStr(client_challenge_hex, sizeof(client_challenge_hex),
client_challenge, sizeof(client_challenge));
BinToStr(client_response_hex, sizeof(client_response_hex),
client_response, sizeof(client_response));
BinToStr(eap_client_hex, sizeof(eap_client_hex), &eap, 8);
Format(password1, sizeof(password1), "%s%s:%s:%s:%s:%s",
IPC_PASSWORD_MSCHAPV2_TAG,
utf8,
server_challenge_hex,
client_challenge_hex,
client_response_hex,
eap_client_hex);
password = password1;
}
}
else
{
// Todo: Do MSCHAPv2
}
}
// Get the Radius server information
if (GetRadiusServerEx2(hub, radius_server_addr, sizeof(radius_server_addr), &radius_server_port, radius_secret, sizeof(radius_secret), &interval, suffix_filter, sizeof(suffix_filter)))
{
@ -528,10 +601,7 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
if (b)
{
if (opt != NULL)
{
opt->Out_IsRadiusLogin = true;
}
opt->Out_IsRadiusLogin = true;
}
}
@ -541,6 +611,11 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
{
HLog(hub, "LH_NO_RADIUS_SETTING", name);
}
if (eap != NULL)
{
ReleaseEapClient(eap);
}
}
else
{