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pop3: Enhanced the extended authentication mechanism detection

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Enhanced the authentication type / mechanism detection in preparation
for the introduction of APOP support.
This commit is contained in:
Steve Holme 2012-06-09 11:48:44 +01:00
parent 6478e1d7e5
commit 4e430a8a16
2 changed files with 36 additions and 7 deletions
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33
lib/pop3.c
View File

@ -22,6 +22,7 @@
* RFC1939 POP3 protocol
* RFC2195 CRAM-MD5 authentication
* RFC2384 POP URL Scheme
* RFC2449 POP3 Extension Mechanism
* RFC2595 Using TLS with IMAP, POP3 and ACAP
* RFC2831 DIGEST-MD5 authentication
* RFC4616 PLAIN authentication
@ -212,8 +213,8 @@ static const struct Curl_handler Curl_handler_pop3s_proxy = {
#endif
/* Function that checks for an ending pop3 status code at the start of the
given string, but also detects the allowed authentication mechanisms
according to the CAPA response. */
given string, but also detects the supported authentication types as well
as the allowed SASL authentication mechanisms within the CAPA response. */
static int pop3_endofresp(struct pingpong *pp, int *resp)
{
char *line = pp->linestart_resp;
@ -239,11 +240,24 @@ static int pop3_endofresp(struct pingpong *pp, int *resp)
return TRUE;
}
/* We are only interested in the SASL line */
if(len < 4 || memcmp(line, "SASL", 4)) {
/* Does the server support clear text? */
if(len >= 4 && !memcmp(line, "USER", 4)) {
pop3c->authtypes |= POP3_TYPE_CLEARTEXT;
return FALSE;
}
/* Does the server support APOP? */
if(len >= 4 && !memcmp(line, "APOP", 4)) {
pop3c->authtypes |= POP3_TYPE_APOP;
return FALSE;
}
/* Does the server support SASL? */
if(len < 4 || memcmp(line, "SASL", 4))
return FALSE;
pop3c->authtypes |= POP3_TYPE_SASL;
/* Advance past the SASL keyword */
line += 4;
len -= 4;
@ -524,8 +538,17 @@ static CURLcode pop3_state_capa_resp(struct connectdata *conn,
if(pop3code != '+')
result = pop3_state_user(conn);
else
else {
/* Check supported authentication types by decreasing order of security */
if(conn->proto.pop3c.authtypes & POP3_TYPE_SASL)
result = pop3_authenticate(conn);
else if(conn->proto.pop3c.authtypes & POP3_TYPE_CLEARTEXT)
result = pop3_state_user(conn);
else {
infof(conn->data, "No known authentication types supported!\n");
result = CURLE_LOGIN_DENIED; /* Other types not supported */
}
}
return result;
}

8
lib/pop3.h
View File

@ -57,14 +57,20 @@ struct pop3_conn {
have been received so far */
size_t strip; /* Number of bytes from the start to ignore as
non-body */
unsigned int authtypes; /* Supported authentication types */
unsigned int authmechs; /* Accepted SASL authentication mechanisms */
unsigned int authused; /* Authentication method used for the connection */
unsigned int authused; /* SASL auth mechanism used for the connection */
pop3state state; /* Always use pop3.c:state() to change state! */
};
extern const struct Curl_handler Curl_handler_pop3;
extern const struct Curl_handler Curl_handler_pop3s;
/* Authentication type flags */
#define POP3_TYPE_CLEARTEXT 0x0001
#define POP3_TYPE_APOP 0x0002
#define POP3_TYPE_SASL 0x0004
/* This is the 5-bytes End-Of-Body marker for POP3 */
#define POP3_EOB "\x0d\x0a\x2e\x0d\x0a"
#define POP3_EOB_LEN 5