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smtp: added basic SASL XOAUTH2 support

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Added the ability to use an XOAUTH2 bearer token [RFC6750] with SMTP for
authentication using RFC6749 "OAuth 2.0 Authorization Framework".

The bearer token is expected to be valid for the user specified in
conn->user. If CURLOPT_XOAUTH2_BEARER is defined and the connection has
an advertised auth mechanism of "XOAUTH2", the user and access token are
formatted as a base64 encoded string and sent to the server as
"AUTH XOAUTH2 <bearer token>".
This commit is contained in:
Kyle L. Huff 2013-08-25 13:17:58 -04:00 committed by Steve Holme
parent 34122800b8
commit 90ab65c632
2 changed files with 62 additions and 1 deletions
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62
lib/smtp.c
View File

@ -26,6 +26,7 @@
* RFC4616 PLAIN authentication
* RFC4954 SMTP Authentication
* RFC5321 SMTP protocol
* RFC6749 OAuth 2.0 Authorization Framework
* Draft SMTP URL Interface
*
***************************************************************************/
@ -290,6 +291,8 @@ static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len,
smtpc->authmechs |= SASL_MECH_EXTERNAL;
else if(wordlen == 4 && !memcmp(line, "NTLM", 4))
smtpc->authmechs |= SASL_MECH_NTLM;
else if(wordlen == 7 && !memcmp(line, "XOAUTH2", 7))
smtpc->authmechs |= SASL_MECH_XOAUTH2;
line += wordlen;
len -= wordlen;
@ -326,6 +329,7 @@ static void state(struct connectdata *conn, smtpstate newstate)
"AUTH_DIGESTMD5_RESP",
"AUTH_NTLM",
"AUTH_NTLM_TYPE2MSG",
"AUTH_XOAUTH2",
"AUTH_FINAL",
"MAIL",
"RCPT",
@ -496,7 +500,20 @@ static CURLcode smtp_perform_authenticate(struct connectdata *conn)
}
else
#endif
if((smtpc->authmechs & SASL_MECH_LOGIN) &&
if((smtpc->authmechs & SASL_MECH_XOAUTH2) &&
(smtpc->prefmech & SASL_MECH_XOAUTH2)) {
mech = "XOAUTH2";
state1 = SMTP_AUTH_XOAUTH2;
state2 = SMTP_AUTH_FINAL;
smtpc->authused = SASL_MECH_XOAUTH2;
if(data->set.sasl_ir)
result = Curl_sasl_create_xoauth2_message(conn->data, conn->user,
conn->xoauth2_bearer,
&initresp, &len);
}
else if((smtpc->authmechs & SASL_MECH_LOGIN) &&
(smtpc->prefmech & SASL_MECH_LOGIN)) {
mech = "LOGIN";
state1 = SMTP_AUTH_LOGIN;
@ -1088,6 +1105,43 @@ static CURLcode smtp_state_auth_ntlm_type2msg_resp(struct connectdata *conn,
}
#endif
/* For AUTH XOAUTH2 (without initial response) responses */
static CURLcode smtp_state_auth_xoauth2_resp(struct connectdata *conn,
int smtpcode, smtpstate instate)
{
CURLcode result = CURLE_OK;
struct SessionHandle *data = conn->data;
size_t len = 0;
char *xoauth = NULL;
(void)instate; /* no use for this yet */
if(smtpcode != 334) {
failf(data, "Access denied: %d", smtpcode);
result = CURLE_LOGIN_DENIED;
}
else {
/* Create the authorisation message */
result = Curl_sasl_create_xoauth2_message(conn->data, conn->user,
conn->xoauth2_bearer,
&xoauth, &len);
/* Send the message */
if(!result) {
if(xoauth) {
result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", xoauth);
if(!result)
state(conn, SMTP_AUTH_FINAL);
}
Curl_safefree(xoauth);
}
}
return result;
}
/* For the final responses to the AUTH sequence */
static CURLcode smtp_state_auth_final_resp(struct connectdata *conn,
int smtpcode,
@ -1296,6 +1350,10 @@ static CURLcode smtp_statemach_act(struct connectdata *conn)
break;
#endif
case SMTP_AUTH_XOAUTH2:
result = smtp_state_auth_xoauth2_resp(conn, smtpcode, smtpc->state);
break;
case SMTP_AUTH_FINAL:
result = smtp_state_auth_final_resp(conn, smtpcode, smtpc->state);
break;
@ -1738,6 +1796,8 @@ static CURLcode smtp_parse_url_options(struct connectdata *conn)
smtpc->prefmech = SASL_MECH_GSSAPI;
else if(strequal(value, "NTLM"))
smtpc->prefmech = SASL_MECH_NTLM;
else if(strequal(value, "XOAUTH2"))
smtpc->prefmech = SASL_MECH_XOAUTH2;
else
smtpc->prefmech = SASL_AUTH_NONE;
}

1
lib/smtp.h
View File

@ -44,6 +44,7 @@ typedef enum {
SMTP_AUTH_DIGESTMD5_RESP,
SMTP_AUTH_NTLM,
SMTP_AUTH_NTLM_TYPE2MSG,
SMTP_AUTH_XOAUTH2,
SMTP_AUTH_FINAL,
SMTP_MAIL, /* MAIL FROM */
SMTP_RCPT, /* RCPT TO */