Commit message: smtp: use the upload buffer size for scratch buffer malloc

... not the read buffer size, as that can be set smaller and thus cause
a buffer overflow! CVE-2018-0500

Reported-by: Peter Wu
Bug: https://curl.haxx.se/docs/adv_2018-70a2.html
CVE: CVE-2018-0500
CWE: CWE-119
Vulnerability description: Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that might be exploitable by an attacker who can control the data that curl transmits over SMTP with certain settings (i.e., use of a nonstandard --limit-rate argument or CURLOPT_BUFFERSIZE value).

Project: curl
File: smtp.c

static CURLcode smtp_block_statemach(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  while(smtpc->state != SMTP_STOP && !result)
    result = Curl_pp_statemach(&smtpc->pp, TRUE);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_connect(struct connectdata *conn, bool *done)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  struct pingpong *pp = &smtpc->pp;

  *done = FALSE; /* default to not done yet */

  /* We always support persistent connections in SMTP */
  connkeep(conn, "SMTP default");

  /* Set the default response time-out */
  pp->response_time = RESP_TIMEOUT;
  pp->statemach_act = smtp_statemach_act;
  pp->endofresp = smtp_endofresp;
  pp->conn = conn;

  /* Initialize the SASL storage */
  Curl_sasl_init(&smtpc->sasl, &saslsmtp);

  /* Initialise the pingpong layer */
  Curl_pp_init(pp);

  /* Parse the URL options */
  result = smtp_parse_url_options(conn);
  if(result)
    return result;

  /* Parse the URL path */
  result = smtp_parse_url_path(conn);
  if(result)
    return result;

  /* Start off waiting for the server greeting response */
  state(conn, SMTP_SERVERGREET);

  result = smtp_multi_statemach(conn, done);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_continue_auth(struct connectdata *conn, const char *resp)
{
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  return Curl_pp_sendf(&smtpc->pp, "%s", resp);
}

Project: curl
File: smtp.c

static CURLcode smtp_disconnect(struct connectdata *conn, bool dead_connection)
{
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  /* We cannot send quit unconditionally. If this connection is stale or
     bad in any way, sending quit and waiting around here will make the
     disconnect wait in vain and cause more problems than we need to. */

  /* The SMTP session may or may not have been allocated/setup at this
     point! */
  if(!dead_connection && smtpc->pp.conn && smtpc->pp.conn->bits.protoconnstart)
    if(!smtp_perform_quit(conn))
      (void)smtp_block_statemach(conn); /* ignore errors on QUIT */

  /* Disconnect from the server */
  Curl_pp_disconnect(&smtpc->pp);

  /* Cleanup the SASL module */
  Curl_sasl_cleanup(conn, smtpc->sasl.authused);

  /* Cleanup our connection based variables */
  Curl_safefree(smtpc->domain);

  return CURLE_OK;
}

Project: curl
File: smtp.c

static CURLcode smtp_do(struct connectdata *conn, bool *done)
{
  CURLcode result = CURLE_OK;

  *done = FALSE; /* default to false */

  /* Parse the custom request */
  result = smtp_parse_custom_request(conn);
  if(result)
    return result;

  result = smtp_regular_transfer(conn, done);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done)
{
  CURLcode result = smtp_multi_statemach(conn, dophase_done);

  if(result)
    DEBUGF(infof(conn->data, "DO phase failed\n"));
  else if(*dophase_done) {
    result = smtp_dophase_done(conn, FALSE /* not connected */);

    DEBUGF(infof(conn->data, "DO phase is complete\n"));
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_done(struct connectdata *conn, CURLcode status,
                          bool premature)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;
  struct pingpong *pp = &conn->proto.smtpc.pp;
  char *eob;
  ssize_t len;
  ssize_t bytes_written;

  (void)premature;

  if(!smtp || !pp->conn)
    return CURLE_OK;

  /* Cleanup our per-request based variables */
  Curl_safefree(smtp->custom);

  if(status) {
    connclose(conn, "SMTP done with bad status"); /* marked for closure */
    result = status;         /* use the already set error code */
  }
  else if(!data->set.connect_only && data->set.mail_rcpt &&
          (data->set.upload || data->set.mimepost.kind)) {
    /* Calculate the EOB taking into account any terminating CRLF from the
       previous line of the email or the CRLF of the DATA command when there
       is "no mail data". RFC-5321, sect. 4.1.1.4.

       Note: As some SSL backends, such as OpenSSL, will cause Curl_write() to
       fail when using a different pointer following a previous write, that
       returned CURLE_AGAIN, we duplicate the EOB now rather than when the
       bytes written doesn't equal len. */
    if(smtp->trailing_crlf || !conn->data->state.infilesize) {
      eob = strdup(SMTP_EOB + 2);
      len = SMTP_EOB_LEN - 2;
    }
    else {
      eob = strdup(SMTP_EOB);
      len = SMTP_EOB_LEN;
    }

    if(!eob)
      return CURLE_OUT_OF_MEMORY;

    /* Send the end of block data */
    result = Curl_write(conn, conn->writesockfd, eob, len, &bytes_written);
    if(result) {
      free(eob);
      return result;
    }

    if(bytes_written != len) {
      /* The whole chunk was not sent so keep it around and adjust the
         pingpong structure accordingly */
      pp->sendthis = eob;
      pp->sendsize = len;
      pp->sendleft = len - bytes_written;
    }
    else {
      /* Successfully sent so adjust the response timeout relative to now */
      pp->response = Curl_now();

      free(eob);
    }

    state(conn, SMTP_POSTDATA);

    /* Run the state-machine

       TODO: when the multi interface is used, this _really_ should be using
       the smtp_multi_statemach function but we have no general support for
       non-blocking DONE operations!
    */
    result = smtp_block_statemach(conn);
  }

  /* Clear the transfer mode for the next request */
  smtp->transfer = FTPTRANSFER_BODY;

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_dophase_done(struct connectdata *conn, bool connected)
{
  struct SMTP *smtp = conn->data->req.protop;

  (void)connected;

  if(smtp->transfer != FTPTRANSFER_BODY)
    /* no data to transfer */
    Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);

  return CURLE_OK;
}

Project: curl
File: smtp.c

static bool smtp_endofresp(struct connectdata *conn, char *line, size_t len,
                           int *resp)
{
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  bool result = FALSE;

  /* Nothing for us */
  if(len < 4 || !ISDIGIT(line[0]) || !ISDIGIT(line[1]) || !ISDIGIT(line[2]))
    return FALSE;

  /* Do we have a command response? This should be the response code followed
     by a space and optionally some text as per RFC-5321 and as outlined in
     Section 4. Examples of RFC-4954 but some e-mail servers ignore this and
     only send the response code instead as per Section 4.2. */
  if(line[3] == ' ' || len == 5) {
    result = TRUE;
    *resp = curlx_sltosi(strtol(line, NULL, 10));

    /* Make sure real server never sends internal value */
    if(*resp == 1)
      *resp = 0;
  }
  /* Do we have a multiline (continuation) response? */
  else if(line[3] == '-' &&
          (smtpc->state == SMTP_EHLO || smtpc->state == SMTP_COMMAND)) {
    result = TRUE;
    *resp = 1;  /* Internal response code */
  }

  return result;
}

Project: curl
File: smtp.c

static void smtp_get_message(char *buffer, char **outptr)
{
  size_t len = strlen(buffer);
  char *message = NULL;

  if(len > 4) {
    /* Find the start of the message */
    len -= 4;
    for(message = buffer + 4; *message == ' ' || *message == '\t';
        message++, len--)
      ;

    /* Find the end of the message */
    for(; len--;)
      if(message[len] != '\r' && message[len] != '\n' && message[len] != ' ' &&
         message[len] != '\t')
        break;

    /* Terminate the message */
    if(++len) {
      message[len] = '\0';
    }
  }
  else
    /* junk input => zero length output */
    message = &buffer[len];

  *outptr = message;
}

Project: curl
File: smtp.c

static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks,
                        int numsocks)
{
  return Curl_pp_getsock(&conn->proto.smtpc.pp, socks, numsocks);
}

Project: curl
File: smtp.c

static CURLcode smtp_init(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp;

  smtp = data->req.protop = calloc(sizeof(struct SMTP), 1);
  if(!smtp)
    result = CURLE_OUT_OF_MEMORY;

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  if((conn->handler->flags & PROTOPT_SSL) && !smtpc->ssldone) {
    result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);
    if(result || !smtpc->ssldone)
      return result;
  }

  result = Curl_pp_statemach(&smtpc->pp, FALSE);
  *done = (smtpc->state == SMTP_STOP) ? TRUE : FALSE;

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_parse_custom_request(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;
  const char *custom = data->set.str[STRING_CUSTOMREQUEST];

  /* URL decode the custom request */
  if(custom)
    result = Curl_urldecode(data, custom, 0, &smtp->custom, NULL, TRUE);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_parse_url_path(struct connectdata *conn)
{
  /* The SMTP struct is already initialised in smtp_connect() */
  struct Curl_easy *data = conn->data;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  const char *path = data->state.path;
  char localhost[HOSTNAME_MAX + 1];

  /* Calculate the path if necessary */
  if(!*path) {
    if(!Curl_gethostname(localhost, sizeof(localhost)))
      path = localhost;
    else
      path = "localhost";
  }

  /* URL decode the path and use it as the domain in our EHLO */
  return Curl_urldecode(conn->data, path, 0, &smtpc->domain, NULL, TRUE);
}

Project: curl
File: smtp.c

static CURLcode smtp_perform(struct connectdata *conn, bool *connected,
                             bool *dophase_done)
{
  /* This is SMTP and no proxy */
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;

  DEBUGF(infof(conn->data, "DO phase starts\n"));

  if(data->set.opt_no_body) {
    /* Requested no body means no transfer */
    smtp->transfer = FTPTRANSFER_INFO;
  }

  *dophase_done = FALSE; /* not done yet */

  /* Store the first recipient (or NULL if not specified) */
  smtp->rcpt = data->set.mail_rcpt;

  /* Initial data character is the first character in line: it is implicitly
     preceded by a virtual CRLF. */
  smtp->trailing_crlf = TRUE;
  smtp->eob = 2;

  /* Start the first command in the DO phase */
  if((data->set.upload || data->set.mimepost.kind) && data->set.mail_rcpt)
    /* MAIL transfer */
    result = smtp_perform_mail(conn);
  else
    /* SMTP based command (VRFY, EXPN, NOOP, RSET or HELP) */
    result = smtp_perform_command(conn);

  if(result)
    return result;

  /* Run the state-machine */
  result = smtp_multi_statemach(conn, dophase_done);

  *connected = conn->bits.tcpconnect[FIRSTSOCKET];

  if(*dophase_done)
    DEBUGF(infof(conn->data, "DO phase is complete\n"));

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_auth(struct connectdata *conn,
                                  const char *mech,
                                  const char *initresp)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  if(initresp) {                                  /* AUTH <mech> ...<crlf> */
    /* Send the AUTH command with the initial response */
    result = Curl_pp_sendf(&smtpc->pp, "AUTH %s %s", mech, initresp);
  }
  else {
    /* Send the AUTH command */
    result = Curl_pp_sendf(&smtpc->pp, "AUTH %s", mech);
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_authentication(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  saslprogress progress;

  /* Check we have enough data to authenticate with, and the
     server supports authentiation, and end the connect phase if not */
  if(!smtpc->auth_supported ||
     !Curl_sasl_can_authenticate(&smtpc->sasl, conn)) {
    state(conn, SMTP_STOP);
    return result;
  }

  /* Calculate the SASL login details */
  result = Curl_sasl_start(&smtpc->sasl, conn, FALSE, &progress);

  if(!result) {
    if(progress == SASL_INPROGRESS)
      state(conn, SMTP_AUTH);
    else {
      /* Other mechanisms not supported */
      infof(conn->data, "No known authentication mechanisms supported!\n");
      result = CURLE_LOGIN_DENIED;
    }
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_command(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;

  /* Send the command */
  if(smtp->rcpt)
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s %s",
                           smtp->custom && smtp->custom[0] != '\0' ?
                           smtp->custom : "VRFY",
                           smtp->rcpt->data);
  else
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s",
                           smtp->custom && smtp->custom[0] != '\0' ?
                           smtp->custom : "HELP");

  if(!result)
    state(conn, SMTP_COMMAND);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_ehlo(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  smtpc->sasl.authmechs = SASL_AUTH_NONE; /* No known auth. mechanism yet */
  smtpc->sasl.authused = SASL_AUTH_NONE;  /* Clear the authentication mechanism
                                             used for esmtp connections */
  smtpc->tls_supported = FALSE;           /* Clear the TLS capability */
  smtpc->auth_supported = FALSE;          /* Clear the AUTH capability */

  /* Send the EHLO command */
  result = Curl_pp_sendf(&smtpc->pp, "EHLO %s", smtpc->domain);

  if(!result)
    state(conn, SMTP_EHLO);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_helo(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  smtpc->sasl.authused = SASL_AUTH_NONE; /* No authentication mechanism used
                                            in smtp connections */

  /* Send the HELO command */
  result = Curl_pp_sendf(&smtpc->pp, "HELO %s", smtpc->domain);

  if(!result)
    state(conn, SMTP_HELO);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_mail(struct connectdata *conn)
{
  char *from = NULL;
  char *auth = NULL;
  char *size = NULL;
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  /* Calculate the FROM parameter */
  if(!data->set.str[STRING_MAIL_FROM])
    /* Null reverse-path, RFC-5321, sect. 3.6.3 */
    from = strdup("<>");
  else if(data->set.str[STRING_MAIL_FROM][0] == '<')
    from = aprintf("%s", data->set.str[STRING_MAIL_FROM]);
  else
    from = aprintf("<%s>", data->set.str[STRING_MAIL_FROM]);

  if(!from)
    return CURLE_OUT_OF_MEMORY;

  /* Calculate the optional AUTH parameter */
  if(data->set.str[STRING_MAIL_AUTH] && conn->proto.smtpc.sasl.authused) {
    if(data->set.str[STRING_MAIL_AUTH][0] != '\0')
      auth = aprintf("%s", data->set.str[STRING_MAIL_AUTH]);
    else
      /* Empty AUTH, RFC-2554, sect. 5 */
      auth = strdup("<>");

    if(!auth) {
      free(from);

      return CURLE_OUT_OF_MEMORY;
    }
  }

  /* Prepare the mime data if some. */
  if(data->set.mimepost.kind != MIMEKIND_NONE) {
    /* Use the whole structure as data. */
    data->set.mimepost.flags &= ~MIME_BODY_ONLY;

    /* Add external headers and mime version. */
    curl_mime_headers(&data->set.mimepost, data->set.headers, 0);
    result = Curl_mime_prepare_headers(&data->set.mimepost, NULL,
                                       NULL, MIMESTRATEGY_MAIL);

    if(!result)
      if(!Curl_checkheaders(conn, "Mime-Version"))
        result = Curl_mime_add_header(&data->set.mimepost.curlheaders,
                                      "Mime-Version: 1.0");

    /* Make sure we will read the entire mime structure. */
    if(!result)
      result = Curl_mime_rewind(&data->set.mimepost);

    if(result) {
      free(from);
      free(auth);
      return result;
    }

    data->state.infilesize = Curl_mime_size(&data->set.mimepost);

    /* Read from mime structure. */
    data->state.fread_func = (curl_read_callback) Curl_mime_read;
    data->state.in = (void *) &data->set.mimepost;
  }

  /* Calculate the optional SIZE parameter */
  if(conn->proto.smtpc.size_supported && data->state.infilesize > 0) {
    size = aprintf("%" CURL_FORMAT_CURL_OFF_T, data->state.infilesize);

    if(!size) {
      free(from);
      free(auth);

      return CURLE_OUT_OF_MEMORY;
    }
  }

  /* Send the MAIL command */
  if(!auth && !size)
    result = Curl_pp_sendf(&conn->proto.smtpc.pp,
                           "MAIL FROM:%s", from);
  else if(auth && !size)
    result = Curl_pp_sendf(&conn->proto.smtpc.pp,
                           "MAIL FROM:%s AUTH=%s", from, auth);
  else if(auth && size)
    result = Curl_pp_sendf(&conn->proto.smtpc.pp,
                           "MAIL FROM:%s AUTH=%s SIZE=%s", from, auth, size);
  else
    result = Curl_pp_sendf(&conn->proto.smtpc.pp,
                           "MAIL FROM:%s SIZE=%s", from, size);

  free(from);
  free(auth);
  free(size);

  if(!result)
    state(conn, SMTP_MAIL);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_quit(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;

  /* Send the QUIT command */
  result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "QUIT");

  if(!result)
    state(conn, SMTP_QUIT);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_rcpt_to(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;

  /* Send the RCPT TO command */
  if(smtp->rcpt->data[0] == '<')
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:%s",
                           smtp->rcpt->data);
  else
    result = Curl_pp_sendf(&conn->proto.smtpc.pp, "RCPT TO:<%s>",
                           smtp->rcpt->data);
  if(!result)
    state(conn, SMTP_RCPT);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_starttls(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;

  /* Send the STARTTLS command */
  result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "STARTTLS");

  if(!result)
    state(conn, SMTP_STARTTLS);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_perform_upgrade_tls(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  struct smtp_conn *smtpc = &conn->proto.smtpc;

  /* Start the SSL connection */
  result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &smtpc->ssldone);

  if(!result) {
    if(smtpc->state != SMTP_UPGRADETLS)
      state(conn, SMTP_UPGRADETLS);

    if(smtpc->ssldone) {
      smtp_to_smtps(conn);
      result = smtp_perform_ehlo(conn);
    }
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_regular_transfer(struct connectdata *conn,
                                      bool *dophase_done)
{
  CURLcode result = CURLE_OK;
  bool connected = FALSE;
  struct Curl_easy *data = conn->data;

  /* Make sure size is unknown at this point */
  data->req.size = -1;

  /* Set the progress data */
  Curl_pgrsSetUploadCounter(data, 0);
  Curl_pgrsSetDownloadCounter(data, 0);
  Curl_pgrsSetUploadSize(data, -1);
  Curl_pgrsSetDownloadSize(data, -1);

  /* Carry out the perform */
  result = smtp_perform(conn, &connected, dophase_done);

  /* Perform post DO phase operations if necessary */
  if(!result && *dophase_done)
    result = smtp_dophase_done(conn, connected);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_setup_connection(struct connectdata *conn)
{
  struct Curl_easy *data = conn->data;
  CURLcode result;

  /* Clear the TLS upgraded flag */
  conn->tls_upgraded = FALSE;

  /* Initialise the SMTP layer */
  result = smtp_init(conn);
  if(result)
    return result;

  data->state.path++;   /* don't include the initial slash */

  return CURLE_OK;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_auth_resp(struct connectdata *conn,
                                     int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  saslprogress progress;

  (void)instate; /* no use for this yet */

  result = Curl_sasl_continue(&smtpc->sasl, conn, smtpcode, &progress);
  if(!result)
    switch(progress) {
    case SASL_DONE:
      state(conn, SMTP_STOP);  /* Authenticated */
      break;
    case SASL_IDLE:            /* No mechanism left after cancellation */
      failf(data, "Authentication cancelled");
      result = CURLE_LOGIN_DENIED;
      break;
    default:
      break;
    }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_data_resp(struct connectdata *conn, int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode != 354) {
    failf(data, "DATA failed: %d", smtpcode);
    result = CURLE_SEND_ERROR;
  }
  else {
    /* Set the progress upload size */
    Curl_pgrsSetUploadSize(data, data->state.infilesize);

    /* SMTP upload */
    Curl_setup_transfer(conn, -1, -1, FALSE, NULL, FIRSTSOCKET, NULL);

    /* End of DO phase */
    state(conn, SMTP_STOP);
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_ehlo_resp(struct connectdata *conn, int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  const char *line = data->state.buffer;
  size_t len = strlen(line);

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2 && smtpcode != 1) {
    if(data->set.use_ssl <= CURLUSESSL_TRY || conn->ssl[FIRSTSOCKET].use)
      result = smtp_perform_helo(conn);
    else {
      failf(data, "Remote access denied: %d", smtpcode);
      result = CURLE_REMOTE_ACCESS_DENIED;
    }
  }
  else {
    line += 4;
    len -= 4;

    /* Does the server support the STARTTLS capability? */
    if(len >= 8 && !memcmp(line, "STARTTLS", 8))
      smtpc->tls_supported = TRUE;

    /* Does the server support the SIZE capability? */
    else if(len >= 4 && !memcmp(line, "SIZE", 4))
      smtpc->size_supported = TRUE;

    /* Does the server support authentication? */
    else if(len >= 5 && !memcmp(line, "AUTH ", 5)) {
      smtpc->auth_supported = TRUE;

      /* Advance past the AUTH keyword */
      line += 5;
      len -= 5;

      /* Loop through the data line */
      for(;;) {
        size_t llen;
        size_t wordlen;
        unsigned int mechbit;

        while(len &&
              (*line == ' ' || *line == '\t' ||
               *line == '\r' || *line == '\n')) {

          line++;
          len--;
        }

        if(!len)
          break;

        /* Extract the word */
        for(wordlen = 0; wordlen < len && line[wordlen] != ' ' &&
              line[wordlen] != '\t' && line[wordlen] != '\r' &&
              line[wordlen] != '\n';)
          wordlen++;

        /* Test the word for a matching authentication mechanism */
        mechbit = Curl_sasl_decode_mech(line, wordlen, &llen);
        if(mechbit && llen == wordlen)
          smtpc->sasl.authmechs |= mechbit;

        line += wordlen;
        len -= wordlen;
      }
    }

    if(smtpcode != 1) {
      if(data->set.use_ssl && !conn->ssl[FIRSTSOCKET].use) {
        /* We don't have a SSL/TLS connection yet, but SSL is requested */
        if(smtpc->tls_supported)
          /* Switch to TLS connection now */
          result = smtp_perform_starttls(conn);
        else if(data->set.use_ssl == CURLUSESSL_TRY)
          /* Fallback and carry on with authentication */
          result = smtp_perform_authentication(conn);
        else {
          failf(data, "STARTTLS not supported.");
          result = CURLE_USE_SSL_FAILED;
        }
      }
      else
        result = smtp_perform_authentication(conn);
    }
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_helo_resp(struct connectdata *conn, int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2) {
    failf(data, "Remote access denied: %d", smtpcode);
    result = CURLE_REMOTE_ACCESS_DENIED;
  }
  else
    /* End of connect phase */
    state(conn, SMTP_STOP);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_mail_resp(struct connectdata *conn, int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2) {
    failf(data, "MAIL failed: %d", smtpcode);
    result = CURLE_SEND_ERROR;
  }
  else
    /* Start the RCPT TO command */
    result = smtp_perform_rcpt_to(conn);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_postdata_resp(struct connectdata *conn,
                                         int smtpcode,
                                         smtpstate instate)
{
  CURLcode result = CURLE_OK;

  (void)instate; /* no use for this yet */

  if(smtpcode != 250)
    result = CURLE_RECV_ERROR;

  /* End of DONE phase */
  state(conn, SMTP_STOP);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_rcpt_resp(struct connectdata *conn, int smtpcode,
                                     smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;
  struct SMTP *smtp = data->req.protop;

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2) {
    failf(data, "RCPT failed: %d", smtpcode);
    result = CURLE_SEND_ERROR;
  }
  else {
    smtp->rcpt = smtp->rcpt->next;

    if(smtp->rcpt)
      /* Send the next RCPT TO command */
      result = smtp_perform_rcpt_to(conn);
    else {
      /* Send the DATA command */
      result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "DATA");

      if(!result)
        state(conn, SMTP_DATA);
    }
  }

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_servergreet_resp(struct connectdata *conn,
                                            int smtpcode,
                                            smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode/100 != 2) {
    failf(data, "Got unexpected smtp-server response: %d", smtpcode);
    result = CURLE_WEIRD_SERVER_REPLY;
  }
  else
    result = smtp_perform_ehlo(conn);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_state_starttls_resp(struct connectdata *conn,
                                         int smtpcode,
                                         smtpstate instate)
{
  CURLcode result = CURLE_OK;
  struct Curl_easy *data = conn->data;

  (void)instate; /* no use for this yet */

  if(smtpcode != 220) {
    if(data->set.use_ssl != CURLUSESSL_TRY) {
      failf(data, "STARTTLS denied, code %d", smtpcode);
      result = CURLE_USE_SSL_FAILED;
    }
    else
      result = smtp_perform_authentication(conn);
  }
  else
    result = smtp_perform_upgrade_tls(conn);

  return result;
}

Project: curl
File: smtp.c

static CURLcode smtp_statemach_act(struct connectdata *conn)
{
  CURLcode result = CURLE_OK;
  curl_socket_t sock = conn->sock[FIRSTSOCKET];
  struct Curl_easy *data = conn->data;
  int smtpcode;
  struct smtp_conn *smtpc = &conn->proto.smtpc;
  struct pingpong *pp = &smtpc->pp;
  size_t nread = 0;

  /* Busy upgrading the connection; right now all I/O is SSL/TLS, not SMTP */
  if(smtpc->state == SMTP_UPGRADETLS)
    return smtp_perform_upgrade_tls(conn);

  /* Flush any data that needs to be sent */
  if(pp->sendleft)
    return Curl_pp_flushsend(pp);

  do {
    /* Read the response from the server */
    result = Curl_pp_readresp(sock, pp, &smtpcode, &nread);
    if(result)
      return result;

    /* Store the latest response for later retrieval if necessary */
    if(smtpc->state != SMTP_QUIT && smtpcode != 1)
      data->info.httpcode = smtpcode;

    if(!smtpcode)
      break;

    /* We have now received a full SMTP server response */
    switch(smtpc->state) {
    case SMTP_SERVERGREET:
      result = smtp_state_servergreet_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_EHLO:
      result = smtp_state_ehlo_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_HELO:
      result = smtp_state_helo_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_STARTTLS:
      result = smtp_state_starttls_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_AUTH:
      result = smtp_state_auth_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_COMMAND:
      result = smtp_state_command_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_MAIL:
      result = smtp_state_mail_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_RCPT:
      result = smtp_state_rcpt_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_DATA:
      result = smtp_state_data_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_POSTDATA:
      result = smtp_state_postdata_resp(conn, smtpcode, smtpc->state);
      break;

    case SMTP_QUIT:
      /* fallthrough, just stop! */
    default:
      /* internal error */
      state(conn, SMTP_STOP);
      break;
    }
  } while(!result && smtpc->state != SMTP_STOP && Curl_pp_moredata(pp));

  return result;
}

Project: curl
File: smtp.c

static void smtp_to_smtps(struct connectdata *conn)
{
  /* Change the connection handler */
  conn->handler = &Curl_handler_smtps;

  /* Set the connection's upgraded to TLS flag */
  conn->tls_upgraded = TRUE;
}

Project: curl
File: smtp.c

static void state(struct connectdata *conn, smtpstate newstate)
{
  struct smtp_conn *smtpc = &conn->proto.smtpc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
  /* for debug purposes */
  static const char * const names[] = {
    "STOP",
    "SERVERGREET",
    "EHLO",
    "HELO",
    "STARTTLS",
    "UPGRADETLS",
    "AUTH",
    "COMMAND",
    "MAIL",
    "RCPT",
    "DATA",
    "POSTDATA",
    "QUIT",
    /* LAST */
  };

  if(smtpc->state != newstate)
    infof(conn->data, "SMTP %p state change from %s to %s\n",
          (void *)smtpc, names[smtpc->state], names[newstate]);
#endif

  smtpc->state = newstate;
}