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pop3: Added support for GSSAPI (Kerberos V5) authentication via Windows SSPI

This commit is contained in:
Steve Holme 2014-08-10 22:01:07 +01:00
parent 96034c4a51
commit 03f368d94c
1 changed files with 186 additions and 0 deletions
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186
lib/pop3.c
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@ -1131,6 +1131,158 @@ static CURLcode pop3_state_auth_ntlm_type2msg_resp(struct connectdata *conn,
}
#endif
#if defined(USE_WINDOWS_SSPI)
/* For AUTH GSSAPI (without initial response) responses */
static CURLcode pop3_state_auth_gssapi_resp(struct connectdata *conn,
int pop3code,
pop3state instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct pop3_conn *pop3c = &conn->proto.pop3c;
size_t len = 0;
char *respmsg = NULL;
(void)instate; /* no use for this yet */
if(pop3code != '+') {
failf(data, "Access denied: %d", pop3code);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the initial response message */
result = Curl_sasl_create_gssapi_user_message(data, conn->user,
conn->passwd, "pop",
pop3c->mutual_auth,
NULL, &conn->krb5,
&respmsg, &len);
if(!result && respmsg) {
/* Send the message */
result = Curl_pp_sendf(&pop3c->pp, "%s", respmsg);
if(!result)
state(conn, POP3_AUTH_GSSAPI_TOKEN);
}
}
Curl_safefree(respmsg);
return result;
}
/* For AUTH GSSAPI user token responses */
static CURLcode pop3_state_auth_gssapi_token_resp(struct connectdata *conn,
int pop3code,
pop3state instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct pop3_conn *pop3c = &conn->proto.pop3c;
char *chlgmsg = NULL;
char *respmsg = NULL;
size_t len = 0;
(void)instate; /* no use for this yet */
if(pop3code != '+') {
failf(data, "Access denied: %d", pop3code);
result = CURLE_LOGIN_DENIED;
}
else {
/* Get the challenge message */
pop3_get_message(data->state.buffer, &chlgmsg);
if(pop3c->mutual_auth)
/* Decode the user token challenge and create the optional response
message */
result = Curl_sasl_create_gssapi_user_message(data, NULL, NULL, NULL,
pop3c->mutual_auth,
chlgmsg, &conn->krb5,
&respmsg, &len);
else
/* Decode the security challenge and create the response message */
result = Curl_sasl_create_gssapi_security_message(data, chlgmsg,
&conn->krb5,
&respmsg, &len);
if(result) {
if(result == CURLE_BAD_CONTENT_ENCODING) {
/* Send the cancellation */
result = Curl_pp_sendf(&pop3c->pp, "%s", "*");
if(!result)
state(conn, POP3_AUTH_CANCEL);
}
}
else {
/* Send the response */
if(respmsg)
result = Curl_pp_sendf(&pop3c->pp, "%s", respmsg);
else
result = Curl_pp_sendf(&pop3c->pp, "%s", "");
if(!result)
state(conn, (pop3c->mutual_auth ? POP3_AUTH_GSSAPI_NO_DATA :
POP3_AUTH_FINAL));
}
}
Curl_safefree(respmsg);
return result;
}
/* For AUTH GSSAPI no data responses */
static CURLcode pop3_state_auth_gssapi_no_data_resp(struct connectdata *conn,
int pop3code,
pop3state instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
char *chlgmsg = NULL;
char *respmsg = NULL;
size_t len = 0;
(void)instate; /* no use for this yet */
if(pop3code != '+') {
failf(data, "Access denied: %d", pop3code);
result = CURLE_LOGIN_DENIED;
}
else {
/* Get the challenge message */
pop3_get_message(data->state.buffer, &chlgmsg);
/* Decode the security challenge and create the security message */
result = Curl_sasl_create_gssapi_security_message(data, chlgmsg,
&conn->krb5,
&respmsg, &len);
if(result) {
if(result == CURLE_BAD_CONTENT_ENCODING) {
/* Send the cancellation */
result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", "*");
if(!result)
state(conn, POP3_AUTH_CANCEL);
}
}
else {
/* Send the response */
if(respmsg) {
result = Curl_pp_sendf(&conn->proto.pop3c.pp, "%s", respmsg);
if(!result)
state(conn, POP3_AUTH_FINAL);
}
}
}
Curl_safefree(respmsg);
return result;
}
#endif
/* For AUTH XOAUTH2 (without initial response) responses */
static CURLcode pop3_state_auth_xoauth2_resp(struct connectdata *conn,
int pop3code, pop3state instate)
@ -1439,6 +1591,21 @@ static CURLcode pop3_statemach_act(struct connectdata *conn)
break;
#endif
#if defined(USE_WINDOWS_SSPI)
case POP3_AUTH_GSSAPI:
result = pop3_state_auth_gssapi_resp(conn, pop3code, pop3c->state);
break;
case POP3_AUTH_GSSAPI_TOKEN:
result = pop3_state_auth_gssapi_token_resp(conn, pop3code, pop3c->state);
break;
case POP3_AUTH_GSSAPI_NO_DATA:
result = pop3_state_auth_gssapi_no_data_resp(conn, pop3code,
pop3c->state);
break;
#endif
case POP3_AUTH_XOAUTH2:
result = pop3_state_auth_xoauth2_resp(conn, pop3code, pop3c->state);
break;
@ -1954,6 +2121,25 @@ static CURLcode pop3_calc_sasl_details(struct connectdata *conn,
/* Calculate the supported authentication mechanism, by decreasing order of
security, as well as the initial response where appropriate */
#if defined(USE_WINDOWS_SSPI)
if((pop3c->authmechs & SASL_MECH_GSSAPI) &&
(pop3c->prefmech & SASL_MECH_GSSAPI)) {
pop3c->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */
*mech = SASL_MECH_STRING_GSSAPI;
*state1 = POP3_AUTH_GSSAPI;
*state2 = POP3_AUTH_GSSAPI_TOKEN;
pop3c->authused = SASL_MECH_GSSAPI;
if(data->set.sasl_ir)
result = Curl_sasl_create_gssapi_user_message(data, conn->user,
conn->passwd, "pop",
pop3c->mutual_auth,
NULL, &conn->krb5,
initresp, len);
}
else
#endif
#ifndef CURL_DISABLE_CRYPTO_AUTH
if((pop3c->authmechs & SASL_MECH_DIGEST_MD5) &&
(pop3c->prefmech & SASL_MECH_DIGEST_MD5)) {