auth_plain.c

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#include "config.h"
#include <stddef.h>
#include "private.h"
#include "mutt/lib.h"
#include "conn/lib.h"
#include "adata.h"
#include "auth.h"
#include "mutt_logging.h"
 
enum ImapAuthRes imap_auth_plain(struct ImapAccountData *adata, const char *method)
{
  static const char auth_plain_cmd[] = "AUTHENTICATE PLAIN";
  // Subtract 1 (for the \0) to get the string length
  static const size_t apc_len = sizeof(auth_plain_cmd) - 1;
 
  struct ConnAccount *cac = &adata->conn->account;
 
  if (mutt_account_getuser(cac) < 0)
    return IMAP_AUTH_FAILURE;
  if (mutt_account_getpass(cac) < 0)
    return IMAP_AUTH_FAILURE;
 
  mutt_message(_("Logging in..."));
 
  int rc_step = IMAP_RES_CONTINUE;
  enum ImapAuthRes rc = IMAP_AUTH_SUCCESS;
  struct Buffer *buf = buf_pool_get();
 
  /* Prepare full AUTHENTICATE PLAIN message */
  mutt_sasl_plain_msg(buf, auth_plain_cmd, cac->user, cac->user, cac->pass);
 
  if (adata->capabilities & IMAP_CAP_SASL_IR)
  {
    imap_cmd_start(adata, buf_string(buf));
  }
  else
  {
    /* Split the message so we send AUTHENTICATE PLAIN first, and the
     * credentials after the first command continuation request */
    buf->data[apc_len] = '\0';
    imap_cmd_start(adata, buf_string(buf));
    while (rc_step == IMAP_RES_CONTINUE)
    {
      rc_step = imap_cmd_step(adata);
    }
    if (rc_step == IMAP_RES_RESPOND)
    {
      buf_addstr(buf, "\r\n");
      mutt_socket_send(adata->conn, buf->data + apc_len + 1);
      rc_step = IMAP_RES_CONTINUE;
    }
  }
 
  while (rc_step == IMAP_RES_CONTINUE)
  {
    rc_step = imap_cmd_step(adata);
  }
 
  if (rc_step == IMAP_RES_BAD)
  {
    rc = IMAP_AUTH_UNAVAIL;
  }
  else if (rc_step == IMAP_RES_NO)
  {
    mutt_error(_("Login failed"));
    rc = IMAP_AUTH_FAILURE;
  }
 
  mutt_clear_error();
  buf_pool_release(&buf);
  return rc;
}