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

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This commit is contained in:
Steve Holme 2014-08-10 21:32:56 +01:00
parent 078d1fbf2b
commit 96034c4a51
1 changed files with 186 additions and 0 deletions
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186
lib/imap.c
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@ -1300,6 +1300,158 @@ static CURLcode imap_state_auth_ntlm_type2msg_resp(struct connectdata *conn,
}
#endif
#if defined(USE_WINDOWS_SSPI)
/* For AUTHENTICATE GSSAPI (without initial response) responses */
static CURLcode imap_state_auth_gssapi_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct imap_conn *imapc = &conn->proto.imapc;
size_t len = 0;
char *respmsg = NULL;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the initial response message */
result = Curl_sasl_create_gssapi_user_message(data, conn->user,
conn->passwd, "imap",
imapc->mutual_auth,
NULL, &conn->krb5,
&respmsg, &len);
if(!result && respmsg) {
/* Send the message */
result = Curl_pp_sendf(&imapc->pp, "%s", respmsg);
if(!result)
state(conn, IMAP_AUTHENTICATE_GSSAPI_TOKEN);
}
}
Curl_safefree(respmsg);
return result;
}
/* For AUTHENTICATE GSSAPI user token responses */
static CURLcode imap_state_auth_gssapi_token_resp(struct connectdata *conn,
int imapcode,
imapstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
struct imap_conn *imapc = &conn->proto.imapc;
char *chlgmsg = NULL;
char *respmsg = NULL;
size_t len = 0;
(void)instate; /* no use for this yet */
if(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Get the challenge message */
imap_get_message(data->state.buffer, &chlgmsg);
if(imapc->mutual_auth)
/* Decode the user token challenge and create the optional response
message */
result = Curl_sasl_create_gssapi_user_message(data, NULL, NULL, NULL,
imapc->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(&imapc->pp, "%s", "*");
if(!result)
state(conn, IMAP_AUTHENTICATE_CANCEL);
}
}
else {
/* Send the response */
if(respmsg)
result = Curl_pp_sendf(&imapc->pp, "%s", respmsg);
else
result = Curl_pp_sendf(&imapc->pp, "%s", "");
if(!result)
state(conn, (imapc->mutual_auth ? IMAP_AUTHENTICATE_GSSAPI_NO_DATA :
IMAP_AUTHENTICATE_FINAL));
}
}
Curl_safefree(respmsg);
return result;
}
/* For AUTHENTICATE GSSAPI no data responses */
static CURLcode imap_state_auth_gssapi_no_data_resp(struct connectdata *conn,
int imapcode,
imapstate 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(imapcode != '+') {
failf(data, "Access denied: %d", imapcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Get the challenge message */
imap_get_message(data->state.buffer, &chlgmsg);
/* 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(&conn->proto.imapc.pp, "%s", "*");
if(!result)
state(conn, IMAP_AUTHENTICATE_CANCEL);
}
}
else {
/* Send the response */
if(respmsg) {
result = Curl_pp_sendf(&conn->proto.imapc.pp, "%s", respmsg);
if(!result)
state(conn, IMAP_AUTHENTICATE_FINAL);
}
}
}
Curl_safefree(respmsg);
return result;
}
#endif
/* For AUTHENTICATE XOAUTH2 (without initial response) responses */
static CURLcode imap_state_auth_xoauth2_resp(struct connectdata *conn,
int imapcode,
@ -1759,6 +1911,21 @@ static CURLcode imap_statemach_act(struct connectdata *conn)
break;
#endif
#if defined(USE_WINDOWS_SSPI)
case IMAP_AUTHENTICATE_GSSAPI:
result = imap_state_auth_gssapi_resp(conn, imapcode, imapc->state);
break;
case IMAP_AUTHENTICATE_GSSAPI_TOKEN:
result = imap_state_auth_gssapi_token_resp(conn, imapcode, imapc->state);
break;
case IMAP_AUTHENTICATE_GSSAPI_NO_DATA:
result = imap_state_auth_gssapi_no_data_resp(conn, imapcode,
imapc->state);
break;
#endif
case IMAP_AUTHENTICATE_XOAUTH2:
result = imap_state_auth_xoauth2_resp(conn, imapcode, imapc->state);
break;
@ -2636,6 +2803,25 @@ static CURLcode imap_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((imapc->authmechs & SASL_MECH_GSSAPI) &&
(imapc->prefmech & SASL_MECH_GSSAPI)) {
imapc->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */
*mech = SASL_MECH_STRING_GSSAPI;
*state1 = IMAP_AUTHENTICATE_GSSAPI;
*state2 = IMAP_AUTHENTICATE_GSSAPI_TOKEN;
imapc->authused = SASL_MECH_GSSAPI;
if(imapc->ir_supported || data->set.sasl_ir)
result = Curl_sasl_create_gssapi_user_message(data, conn->user,
conn->passwd, "imap",
imapc->mutual_auth,
NULL, &conn->krb5,
initresp, len);
}
else
#endif
#ifndef CURL_DISABLE_CRYPTO_AUTH
if((imapc->authmechs & SASL_MECH_DIGEST_MD5) &&
(imapc->prefmech & SASL_MECH_DIGEST_MD5)) {