/* IMAP login/authentication code */
-#if HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include <lib-lib/lib-lib.h>
-#include <lib-lib/mem.h>
-
-#include <lib-lib/macros.h>
-#include "lib/debug.h"
+#include <sasl/sasl.h>
+#include <sasl/saslutil.h>
#include "mutt.h"
-#include "ascii.h"
+#include "mutt_sasl.h"
#include "imap_private.h"
-#include "auth.h"
-
-static imap_auth_t imap_authenticators[] = {
-#ifdef USE_SASL
- {imap_auth_sasl, NULL},
-#else
- {imap_auth_anon, "anonymous"},
-#endif
-#ifdef USE_GSS
- {imap_auth_gss, "gssapi"},
-#endif
- /* SASL includes CRAM-MD5 (and GSSAPI, but that's not enabled by default) */
-#ifndef USE_SASL
- {imap_auth_cram_md5, "cram-md5"},
-#endif
- {imap_auth_login, "login"},
-
- {NULL, NULL}
+
+enum {
+ IMAP_AUTH_SUCCESS = 0,
+ IMAP_AUTH_FAILURE,
+ IMAP_AUTH_UNAVAIL
};
-/* imap_authenticate: Attempt to authenticate using either user-specified
- * authentication method if specified, or any. */
-int imap_authenticate (IMAP_DATA * idata)
+/* imap_auth_sasl: Default authenticator if available. */
+static int imap_auth_sasl(IMAP_DATA * idata, const char *method)
{
- imap_auth_t *authenticator;
- char *methods;
- char *method;
- char *delim;
- int r = -1;
-
- if (ImapAuthenticators && *ImapAuthenticators) {
- /* Try user-specified list of authentication methods */
- methods = m_strdup(ImapAuthenticators);
-
- for (method = methods; method; method = delim) {
- delim = strchr (method, ':');
- if (delim)
- *delim++ = '\0';
- if (!method[0])
- continue;
-
- debug_print (2, ("Trying method %s\n", method));
- authenticator = imap_authenticators;
-
- while (authenticator->authenticate) {
- if (!authenticator->method ||
- !ascii_strcasecmp (authenticator->method, method))
- if ((r = authenticator->authenticate (idata, method)) !=
- IMAP_AUTH_UNAVAIL) {
- p_delete(&methods);
- return r;
- }
+ sasl_conn_t *saslconn;
+ sasl_interact_t *interaction = NULL;
+ int rc, irc;
+ char buf[HUGE_STRING];
+ const char *mech;
+
+ const char *pc = NULL;
+ unsigned int len, olen;
+ unsigned char client_start;
+
+ if (mutt_sasl_client_new (idata->conn, &saslconn) < 0) {
+ return IMAP_AUTH_FAILURE;
+ }
- authenticator++;
- }
+ rc = SASL_FAIL;
+
+ /* If the user hasn't specified a method, use any available */
+ if (!method) {
+ method = idata->capstr;
+
+ /* hack for SASL ANONYMOUS support:
+ * 1. Fetch username. If it's "" or "anonymous" then
+ * 2. attempt sasl_client_start with only "AUTH=ANONYMOUS" capability
+ * 3. if sasl_client_start fails, fall through... */
+
+ if (mutt_account_getuser (&idata->conn->account))
+ return IMAP_AUTH_FAILURE;
+
+ if (mutt_bit_isset (idata->capabilities, AUTH_ANON) &&
+ (!idata->conn->account.user[0] ||
+ !m_strncmp(idata->conn->account.user, "anonymous", 9)))
+ rc = sasl_client_start (saslconn, "AUTH=ANONYMOUS", NULL, &pc, &olen,
+ &mech);
+ }
+
+ if (rc != SASL_OK && rc != SASL_CONTINUE)
+ do {
+ rc = sasl_client_start (saslconn, method, &interaction,
+ &pc, &olen, &mech);
+ if (rc == SASL_INTERACT)
+ mutt_sasl_interact (interaction);
}
+ while (rc == SASL_INTERACT);
- p_delete(&methods);
+ client_start = (olen > 0);
+
+ if (rc != SASL_OK && rc != SASL_CONTINUE) {
+ /* SASL doesn't support LOGIN, so fall back */
+ return IMAP_AUTH_UNAVAIL;
}
- else {
- /* Fall back to default: any authenticator */
- debug_print (2, ("Using any available method.\n"));
- authenticator = imap_authenticators;
-
- while (authenticator->authenticate) {
- if ((r =
- authenticator->authenticate (idata, NULL)) != IMAP_AUTH_UNAVAIL)
- return r;
- authenticator++;
+
+ mutt_message (_("Authenticating (%s)..."), mech);
+
+ snprintf (buf, sizeof (buf), "AUTHENTICATE %s", mech);
+ imap_cmd_start (idata, buf);
+ irc = IMAP_CMD_CONTINUE;
+
+ /* looping protocol */
+ while (rc == SASL_CONTINUE || olen > 0) {
+ do
+ irc = imap_cmd_step (idata);
+ while (irc == IMAP_CMD_CONTINUE);
+
+ if (method && irc == IMAP_CMD_NO) {
+ sasl_dispose (&saslconn);
+ return IMAP_AUTH_UNAVAIL;
+ }
+
+ if (irc == IMAP_CMD_BAD || irc == IMAP_CMD_NO)
+ goto bail;
+
+ if (irc == IMAP_CMD_RESPOND) {
+ if (sasl_decode64(idata->cmd.buf.data + 2, idata->cmd.buf.len - 2, buf,
+ LONG_STRING - 1, &len) != SASL_OK)
+ {
+ goto bail;
+ }
+ }
+
+ /* client-start is only available with the SASL-IR extension, but
+ * SASL 2.1 seems to want to use it regardless, at least for DIGEST
+ * fast reauth. Override if the server sent an initial continuation */
+ if (!client_start || buf[0]) {
+ do {
+ rc = sasl_client_step (saslconn, buf, len, &interaction, &pc, &olen);
+ if (rc == SASL_INTERACT)
+ mutt_sasl_interact (interaction);
+ }
+ while (rc == SASL_INTERACT);
+ }
+ else
+ client_start = 0;
+
+ /* send out response, or line break if none needed */
+ if (olen) {
+ if (sasl_encode64 (pc, olen, buf, sizeof (buf), &olen) != SASL_OK) {
+ goto bail;
+ }
+ }
+
+ if (irc == IMAP_CMD_RESPOND) {
+ m_strcpy(buf + olen, sizeof(buf) - olen, "\r\n");
+ mutt_socket_write (idata->conn, buf);
}
+
+ /* If SASL has errored out, send an abort string to the server */
+ if (rc < 0) {
+ mutt_socket_write (idata->conn, "*\r\n");
+ }
+
+ olen = 0;
}
- if (r == IMAP_AUTH_UNAVAIL) {
- mutt_error (_("No authenticators available"));
- mutt_sleep (1);
+ while (irc != IMAP_CMD_OK)
+ if ((irc = imap_cmd_step (idata)) != IMAP_CMD_CONTINUE)
+ break;
+
+ if (rc != SASL_OK)
+ goto bail;
+
+ if (imap_code(idata->cmd.buf.data)) {
+ mutt_sasl_setup_conn (idata->conn, saslconn);
+ return IMAP_AUTH_SUCCESS;
}
- return r;
+bail:
+ mutt_error _("SASL authentication failed.");
+ mutt_sleep (2);
+ sasl_dispose (&saslconn);
+
+ return IMAP_AUTH_FAILURE;
+}
+
+int imap_authenticate (IMAP_DATA * idata)
+{
+ int r = -1;
+
+ if (!m_strisempty(ImapAuthenticators)) {
+ const char *p, *q;
+ char buf[STRING];
+
+ for (p = ImapAuthenticators;; p = q) {
+ while (*p == ':')
+ p++;
+ if (!*p)
+ break;
+
+ q = strchrnul(p, ':');
+ m_strncpy(buf, sizeof(buf), p, q - p);
+
+ if ((r = imap_auth_sasl(idata, buf)) != IMAP_AUTH_UNAVAIL) {
+ return r;
+ }
+ }
+ } else {
+ if ((r = imap_auth_sasl(idata, NULL)) != IMAP_AUTH_UNAVAIL) {
+ return r;
+ }
+ }
+
+ mutt_error (_("No authenticators available"));
+ mutt_sleep (1);
+ return r;
}
projects / apps / madmutt.git / blobdiff