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Diffstat (limited to 'Utilities/cmcurl/lib/smtp.c')
| -rw-r--r-- | Utilities/cmcurl/lib/smtp.c | 2378 |
1 files changed, 2378 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/smtp.c b/Utilities/cmcurl/lib/smtp.c new file mode 100644 index 0000000..9aa8b15 --- /dev/null +++ b/Utilities/cmcurl/lib/smtp.c @@ -0,0 +1,2378 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + * RFC1870 SMTP Service Extension for Message Size + * RFC2195 CRAM-MD5 authentication + * RFC2831 DIGEST-MD5 authentication + * RFC3207 SMTP over TLS + * RFC4422 Simple Authentication and Security Layer (SASL) + * RFC4616 PLAIN authentication + * RFC4752 The Kerberos V5 ("GSSAPI") SASL Mechanism + * RFC4954 SMTP Authentication + * RFC5321 SMTP protocol + * RFC6749 OAuth 2.0 Authorization Framework + * Draft SMTP URL Interface <draft-earhart-url-smtp-00.txt> + * Draft LOGIN SASL Mechanism <draft-murchison-sasl-login-00.txt> + * + ***************************************************************************/ + +#include "curl_setup.h" + +#ifndef CURL_DISABLE_SMTP + +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +#ifdef HAVE_ARPA_INET_H +#include <arpa/inet.h> +#endif +#ifdef HAVE_UTSNAME_H +#include <sys/utsname.h> +#endif +#ifdef HAVE_NETDB_H +#include <netdb.h> +#endif +#ifdef __VMS +#include <in.h> +#include <inet.h> +#endif + +#if (defined(NETWARE) && defined(__NOVELL_LIBC__)) +#undef in_addr_t +#define in_addr_t unsigned long +#endif + +#include <curl/curl.h> +#include "urldata.h" +#include "sendf.h" +#include "if2ip.h" +#include "hostip.h" +#include "progress.h" +#include "transfer.h" +#include "escape.h" +#include "http.h" /* for HTTP proxy tunnel stuff */ +#include "socks.h" +#include "smtp.h" + +#include "strtoofft.h" +#include "strequal.h" +#include "vtls/vtls.h" +#include "connect.h" +#include "strerror.h" +#include "select.h" +#include "multiif.h" +#include "url.h" +#include "rawstr.h" +#include "curl_gethostname.h" +#include "curl_sasl.h" +#include "warnless.h" + +#define _MPRINTF_REPLACE /* use our functions only */ +#include <curl/mprintf.h> + +#include "curl_memory.h" +/* The last #include file should be: */ +#include "memdebug.h" + +/* Local API functions */ +static CURLcode smtp_regular_transfer(struct connectdata *conn, bool *done); +static CURLcode smtp_do(struct connectdata *conn, bool *done); +static CURLcode smtp_done(struct connectdata *conn, CURLcode status, + bool premature); +static CURLcode smtp_connect(struct connectdata *conn, bool *done); +static CURLcode smtp_disconnect(struct connectdata *conn, bool dead); +static CURLcode smtp_multi_statemach(struct connectdata *conn, bool *done); +static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks, + int numsocks); +static CURLcode smtp_doing(struct connectdata *conn, bool *dophase_done); +static CURLcode smtp_setup_connection(struct connectdata *conn); +static CURLcode smtp_parse_url_options(struct connectdata *conn); +static CURLcode smtp_parse_url_path(struct connectdata *conn); +static CURLcode smtp_parse_custom_request(struct connectdata *conn); +static CURLcode smtp_calc_sasl_details(struct connectdata *conn, + const char **mech, + char **initresp, size_t *len, + smtpstate *state1, smtpstate *state2); + +/* + * SMTP protocol handler. + */ + +const struct Curl_handler Curl_handler_smtp = { + "SMTP", /* scheme */ + smtp_setup_connection, /* setup_connection */ + smtp_do, /* do_it */ + smtp_done, /* done */ + ZERO_NULL, /* do_more */ + smtp_connect, /* connect_it */ + smtp_multi_statemach, /* connecting */ + smtp_doing, /* doing */ + smtp_getsock, /* proto_getsock */ + smtp_getsock, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + ZERO_NULL, /* perform_getsock */ + smtp_disconnect, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_SMTP, /* defport */ + CURLPROTO_SMTP, /* protocol */ + PROTOPT_CLOSEACTION | PROTOPT_NOURLQUERY /* flags */ +}; + +#ifdef USE_SSL +/* + * SMTPS protocol handler. + */ + +const struct Curl_handler Curl_handler_smtps = { + "SMTPS", /* scheme */ + smtp_setup_connection, /* setup_connection */ + smtp_do, /* do_it */ + smtp_done, /* done */ + ZERO_NULL, /* do_more */ + smtp_connect, /* connect_it */ + smtp_multi_statemach, /* connecting */ + smtp_doing, /* doing */ + smtp_getsock, /* proto_getsock */ + smtp_getsock, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + ZERO_NULL, /* perform_getsock */ + smtp_disconnect, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_SMTPS, /* defport */ + CURLPROTO_SMTPS, /* protocol */ + PROTOPT_CLOSEACTION | PROTOPT_SSL + | PROTOPT_NOURLQUERY /* flags */ +}; +#endif + +#ifndef CURL_DISABLE_HTTP +/* + * HTTP-proxyed SMTP protocol handler. + */ + +static const struct Curl_handler Curl_handler_smtp_proxy = { + "SMTP", /* scheme */ + Curl_http_setup_conn, /* setup_connection */ + Curl_http, /* do_it */ + Curl_http_done, /* done */ + ZERO_NULL, /* do_more */ + ZERO_NULL, /* connect_it */ + ZERO_NULL, /* connecting */ + ZERO_NULL, /* doing */ + ZERO_NULL, /* proto_getsock */ + ZERO_NULL, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + ZERO_NULL, /* perform_getsock */ + ZERO_NULL, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_SMTP, /* defport */ + CURLPROTO_HTTP, /* protocol */ + PROTOPT_NONE /* flags */ +}; + +#ifdef USE_SSL +/* + * HTTP-proxyed SMTPS protocol handler. + */ + +static const struct Curl_handler Curl_handler_smtps_proxy = { + "SMTPS", /* scheme */ + Curl_http_setup_conn, /* setup_connection */ + Curl_http, /* do_it */ + Curl_http_done, /* done */ + ZERO_NULL, /* do_more */ + ZERO_NULL, /* connect_it */ + ZERO_NULL, /* connecting */ + ZERO_NULL, /* doing */ + ZERO_NULL, /* proto_getsock */ + ZERO_NULL, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + ZERO_NULL, /* perform_getsock */ + ZERO_NULL, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_SMTPS, /* defport */ + CURLPROTO_HTTP, /* protocol */ + PROTOPT_NONE /* flags */ +}; +#endif +#endif + +#ifdef USE_SSL +static void smtp_to_smtps(struct connectdata *conn) +{ + conn->handler = &Curl_handler_smtps; +} +#else +#define smtp_to_smtps(x) Curl_nop_stmt +#endif + +/*********************************************************************** + * + * smtp_endofresp() + * + * Checks for an ending SMTP status code at the start of the given string, but + * also detects various capabilities from the EHLO response including the + * supported authentication mechanisms. + */ +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; +} + +/*********************************************************************** + * + * smtp_get_message() + * + * Gets the authentication message from the response buffer. + */ +static void smtp_get_message(char *buffer, char** outptr) +{ + size_t len = 0; + char* message = NULL; + + /* Find the start of the message */ + for(message = buffer + 4; *message == ' ' || *message == '\t'; message++) + ; + + /* Find the end of the message */ + for(len = strlen(message); len--;) + if(message[len] != '\r' && message[len] != '\n' && message[len] != ' ' && + message[len] != '\t') + break; + + /* Terminate the message */ + if(++len) { + message[len] = '\0'; + } + + *outptr = message; +} + +/*********************************************************************** + * + * state() + * + * This is the ONLY way to change SMTP state! + */ +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_PLAIN", + "AUTH_LOGIN", + "AUTH_LOGIN_PASSWD", + "AUTH_CRAMMD5", + "AUTH_DIGESTMD5", + "AUTH_DIGESTMD5_RESP", + "AUTH_NTLM", + "AUTH_NTLM_TYPE2MSG", + "AUTH_GSSAPI", + "AUTH_GSSAPI_TOKEN", + "AUTH_GSSAPI_NO_DATA", + "AUTH_XOAUTH2", + "AUTH_CANCEL", + "AUTH_FINAL", + "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; +} + +/*********************************************************************** + * + * smtp_perform_ehlo() + * + * Sends the EHLO command to not only initialise communication with the ESMTP + * server but to also obtain a list of server side supported capabilities. + */ +static CURLcode smtp_perform_ehlo(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct smtp_conn *smtpc = &conn->proto.smtpc; + + smtpc->authmechs = 0; /* No known authentication mechanisms yet */ + smtpc->authused = 0; /* 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; +} + +/*********************************************************************** + * + * smtp_perform_helo() + * + * Sends the HELO command to initialise communication with the SMTP server. + */ +static CURLcode smtp_perform_helo(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct smtp_conn *smtpc = &conn->proto.smtpc; + + smtpc->authused = 0; /* 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; +} + +/*********************************************************************** + * + * smtp_perform_starttls() + * + * Sends the STLS command to start the upgrade to TLS. + */ +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; +} + +/*********************************************************************** + * + * smtp_perform_upgrade_tls() + * + * Performs the upgrade to TLS. + */ +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; +} + +/*********************************************************************** + * + * smtp_perform_auth() + * + * Sends an AUTH command allowing the client to login with the given SASL + * authentication mechanism. + */ +static CURLcode smtp_perform_auth(struct connectdata *conn, + const char *mech, + const char *initresp, size_t len, + smtpstate state1, smtpstate state2) +{ + CURLcode result = CURLE_OK; + struct smtp_conn *smtpc = &conn->proto.smtpc; + + if(initresp && 8 + strlen(mech) + len <= 512) { /* AUTH <mech> ...<crlf> */ + /* Send the AUTH command with the initial response */ + result = Curl_pp_sendf(&smtpc->pp, "AUTH %s %s", mech, initresp); + + if(!result) + state(conn, state2); + } + else { + /* Send the AUTH command */ + result = Curl_pp_sendf(&smtpc->pp, "AUTH %s", mech); + + if(!result) + state(conn, state1); + } + + return result; +} + +/*********************************************************************** + * + * smtp_perform_authentication() + * + * Initiates the authentication sequence, with the appropriate SASL + * authentication mechanism. + */ +static CURLcode smtp_perform_authentication(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct smtp_conn *smtpc = &conn->proto.smtpc; + const char *mech = NULL; + char *initresp = NULL; + size_t len = 0; + smtpstate state1 = SMTP_STOP; + smtpstate state2 = SMTP_STOP; + + /* Check we have a username and password to authenticate with, and the + server supports authentiation, and end the connect phase if not */ + if(!conn->bits.user_passwd || !smtpc->auth_supported) { + state(conn, SMTP_STOP); + + return result; + } + + /* Calculate the SASL login details */ + result = smtp_calc_sasl_details(conn, &mech, &initresp, &len, &state1, + &state2); + + if(!result) { + if(mech) { + /* Perform SASL based authentication */ + result = smtp_perform_auth(conn, mech, initresp, len, state1, state2); + + Curl_safefree(initresp); + } + else { + /* Other mechanisms not supported */ + infof(conn->data, "No known authentication mechanisms supported!\n"); + result = CURLE_LOGIN_DENIED; + } + } + + return result; +} + +/*********************************************************************** + * + * smtp_perform_command() + * + * Sends a SMTP based command. + */ +static CURLcode smtp_perform_command(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/*********************************************************************** + * + * smtp_perform_mail() + * + * Sends an MAIL command to initiate the upload of a message. + */ +static CURLcode smtp_perform_mail(struct connectdata *conn) +{ + char *from = NULL; + char *auth = NULL; + char *size = NULL; + CURLcode result = CURLE_OK; + struct SessionHandle *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.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) { + Curl_safefree(from); + + return CURLE_OUT_OF_MEMORY; + } + } + + /* Calculate the optional SIZE parameter */ + if(conn->proto.smtpc.size_supported && conn->data->state.infilesize > 0) { + size = aprintf("%" CURL_FORMAT_CURL_OFF_T, data->state.infilesize); + + if(!size) { + Curl_safefree(from); + Curl_safefree(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); + + Curl_safefree(from); + Curl_safefree(auth); + Curl_safefree(size); + + if(!result) + state(conn, SMTP_MAIL); + + return result; +} + +/*********************************************************************** + * + * smtp_perform_rcpt_to() + * + * Sends a RCPT TO command for a given recipient as part of the message upload + * process. + */ +static CURLcode smtp_perform_rcpt_to(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/*********************************************************************** + * + * smtp_perform_quit() + * + * Performs the quit action prior to sclose() being called. + */ +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; +} + +/* For the initial server greeting */ +static CURLcode smtp_state_servergreet_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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_FTP_WEIRD_SERVER_REPLY; + } + else + result = smtp_perform_ehlo(conn); + + return result; +} + +/* For STARTTLS responses */ +static CURLcode smtp_state_starttls_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 220) { + if(data->set.use_ssl != CURLUSESSL_TRY) { + failf(data, "STARTTLS denied. %c", smtpcode); + result = CURLE_USE_SSL_FAILED; + } + else + result = smtp_perform_authentication(conn); + } + else + result = smtp_perform_upgrade_tls(conn); + + return result; +} + +/* For EHLO responses */ +static CURLcode smtp_state_ehlo_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct smtp_conn *smtpc = &conn->proto.smtpc; + const char *line = data->state.buffer; + size_t len = strlen(line); + size_t wordlen; + + (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(;;) { + 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 */ + if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_LOGIN)) + smtpc->authmechs |= SASL_MECH_LOGIN; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_PLAIN)) + smtpc->authmechs |= SASL_MECH_PLAIN; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_CRAM_MD5)) + smtpc->authmechs |= SASL_MECH_CRAM_MD5; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_DIGEST_MD5)) + smtpc->authmechs |= SASL_MECH_DIGEST_MD5; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_GSSAPI)) + smtpc->authmechs |= SASL_MECH_GSSAPI; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_EXTERNAL)) + smtpc->authmechs |= SASL_MECH_EXTERNAL; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_NTLM)) + smtpc->authmechs |= SASL_MECH_NTLM; + else if(sasl_mech_equal(line, wordlen, SASL_MECH_STRING_XOAUTH2)) + smtpc->authmechs |= SASL_MECH_XOAUTH2; + + 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; +} + +/* For HELO responses */ +static CURLcode smtp_state_helo_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/* For AUTH PLAIN (without initial response) responses */ +static CURLcode smtp_state_auth_plain_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + size_t len = 0; + char *plainauth = 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_plain_message(conn->data, conn->user, + conn->passwd, &plainauth, &len); + if(!result && plainauth) { + /* Send the message */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", plainauth); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + + Curl_safefree(plainauth); + + return result; +} + +/* For AUTH LOGIN (without initial response) responses */ +static CURLcode smtp_state_auth_login_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + size_t len = 0; + char *authuser = NULL; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Create the user message */ + result = Curl_sasl_create_login_message(conn->data, conn->user, + &authuser, &len); + if(!result && authuser) { + /* Send the user */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", authuser); + + if(!result) + state(conn, SMTP_AUTH_LOGIN_PASSWD); + } + } + + Curl_safefree(authuser); + + return result; +} + +/* For AUTH LOGIN user entry responses */ +static CURLcode smtp_state_auth_login_password_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + size_t len = 0; + char *authpasswd = NULL; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Create the password message */ + result = Curl_sasl_create_login_message(conn->data, conn->passwd, + &authpasswd, &len); + if(!result && authpasswd) { + /* Send the password */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", authpasswd); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + + Curl_safefree(authpasswd); + + return result; +} + +#ifndef CURL_DISABLE_CRYPTO_AUTH +/* For AUTH CRAM-MD5 responses */ +static CURLcode smtp_state_auth_cram_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + char *chlg = NULL; + char *chlg64 = NULL; + char *rplyb64 = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + return CURLE_LOGIN_DENIED; + } + + /* Get the challenge message */ + smtp_get_message(data->state.buffer, &chlg64); + + /* Decode the challenge message */ + result = Curl_sasl_decode_cram_md5_message(chlg64, &chlg, &len); + if(result) { + /* Send the cancellation */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "*"); + + if(!result) + state(conn, SMTP_AUTH_CANCEL); + } + else { + /* Create the response message */ + result = Curl_sasl_create_cram_md5_message(data, chlg, conn->user, + conn->passwd, &rplyb64, &len); + if(!result && rplyb64) { + /* Send the response */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", rplyb64); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + + Curl_safefree(chlg); + Curl_safefree(rplyb64); + + return result; +} + +/* For AUTH DIGEST-MD5 challenge responses */ +static CURLcode smtp_state_auth_digest_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + char *chlg64 = NULL; + char *rplyb64 = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + return CURLE_LOGIN_DENIED; + } + + /* Get the challenge message */ + smtp_get_message(data->state.buffer, &chlg64); + + /* Create the response message */ + result = Curl_sasl_create_digest_md5_message(data, chlg64, + conn->user, conn->passwd, + "smtp", &rplyb64, &len); + if(result) { + if(result == CURLE_BAD_CONTENT_ENCODING) { + /* Send the cancellation */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "*"); + + if(!result) + state(conn, SMTP_AUTH_CANCEL); + } + } + else { + /* Send the response */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", rplyb64); + + if(!result) + state(conn, SMTP_AUTH_DIGESTMD5_RESP); + } + + Curl_safefree(rplyb64); + + return result; +} + +/* For AUTH DIGEST-MD5 challenge-response responses */ +static CURLcode smtp_state_auth_digest_resp_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Authentication failed: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Send an empty response */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", ""); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + + return result; +} + +#endif + +#ifdef USE_NTLM +/* For AUTH NTLM (without initial response) responses */ +static CURLcode smtp_state_auth_ntlm_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + char *type1msg = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Create the type-1 message */ + result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd, + &conn->ntlm, + &type1msg, &len); + if(!result && type1msg) { + /* Send the message */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", type1msg); + + if(!result) + state(conn, SMTP_AUTH_NTLM_TYPE2MSG); + } + } + + Curl_safefree(type1msg); + + return result; +} + +/* For NTLM type-2 responses (sent in reponse to our type-1 message) */ +static CURLcode smtp_state_auth_ntlm_type2msg_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + char *type2msg = NULL; + char *type3msg = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Get the type-2 message */ + smtp_get_message(data->state.buffer, &type2msg); + + /* Decode the type-2 message */ + result = Curl_sasl_decode_ntlm_type2_message(data, type2msg, &conn->ntlm); + if(result) { + /* Send the cancellation */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "*"); + + if(!result) + state(conn, SMTP_AUTH_CANCEL); + } + else { + /* Create the type-3 message */ + result = Curl_sasl_create_ntlm_type3_message(data, conn->user, + conn->passwd, &conn->ntlm, + &type3msg, &len); + if(!result && type3msg) { + /* Send the message */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", type3msg); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + } + + Curl_safefree(type3msg); + + return result; +} +#endif + +#if defined(USE_WINDOWS_SSPI) +/* For AUTH GSSAPI (without initial response) responses */ +static CURLcode smtp_state_auth_gssapi_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct smtp_conn *smtpc = &conn->proto.smtpc; + char *respmsg = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Create the initial response message */ + result = Curl_sasl_create_gssapi_user_message(data, conn->user, + conn->passwd, "smtp", + smtpc->mutual_auth, NULL, + &conn->krb5, + &respmsg, &len); + if(!result && respmsg) { + /* Send the message */ + result = Curl_pp_sendf(&smtpc->pp, "%s", respmsg); + + if(!result) + state(conn, SMTP_AUTH_GSSAPI_TOKEN); + } + } + + Curl_safefree(respmsg); + + return result; +} + +/* For AUTH GSSAPI user token responses */ +static CURLcode smtp_state_auth_gssapi_token_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct smtp_conn *smtpc = &conn->proto.smtpc; + char *chlgmsg = NULL; + char *respmsg = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Get the challenge message */ + smtp_get_message(data->state.buffer, &chlgmsg); + + if(smtpc->mutual_auth) + /* Decode the user token challenge and create the optional response + message */ + result = Curl_sasl_create_gssapi_user_message(data, NULL, NULL, NULL, + smtpc->mutual_auth, + chlgmsg, &conn->krb5, + &respmsg, &len); + else + /* Decode the security challenge and create the response message */ + result = Curl_sasl_create_gssapi_security_message(data, chlgmsg, + &conn->krb5, + &respmsg, &len); + + if(result) { + if(result == CURLE_BAD_CONTENT_ENCODING) { + /* Send the cancellation */ + result = Curl_pp_sendf(&smtpc->pp, "%s", "*"); + + if(!result) + state(conn, SMTP_AUTH_CANCEL); + } + } + else { + /* Send the response */ + if(respmsg) + result = Curl_pp_sendf(&smtpc->pp, "%s", respmsg); + else + result = Curl_pp_sendf(&smtpc->pp, "%s", ""); + + if(!result) + state(conn, (smtpc->mutual_auth ? SMTP_AUTH_GSSAPI_NO_DATA : + SMTP_AUTH_FINAL)); + } + } + + Curl_safefree(respmsg); + + return result; +} + +/* For AUTH GSSAPI no data responses */ +static CURLcode smtp_state_auth_gssapi_no_data_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + char *chlgmsg = NULL; + char *respmsg = NULL; + size_t len = 0; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 334) { + failf(data, "Access denied: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else { + /* Get the challenge message */ + smtp_get_message(data->state.buffer, &chlgmsg); + + /* Decode the security challenge and create the response message */ + result = Curl_sasl_create_gssapi_security_message(data, chlgmsg, + &conn->krb5, + &respmsg, &len); + if(result) { + if(result == CURLE_BAD_CONTENT_ENCODING) { + /* Send the cancellation */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", "*"); + + if(!result) + state(conn, SMTP_AUTH_CANCEL); + } + } + else { + /* Send the response */ + if(respmsg) { + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", respmsg); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + } + + Curl_safefree(respmsg); + + return result; +} +#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); + if(!result && xoauth) { + /* Send the message */ + result = Curl_pp_sendf(&conn->proto.smtpc.pp, "%s", xoauth); + + if(!result) + state(conn, SMTP_AUTH_FINAL); + } + } + + Curl_safefree(xoauth); + + return result; +} + +/* For AUTH cancellation responses */ +static CURLcode smtp_state_auth_cancel_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct smtp_conn *smtpc = &conn->proto.smtpc; + const char *mech = NULL; + char *initresp = NULL; + size_t len = 0; + smtpstate state1 = SMTP_STOP; + smtpstate state2 = SMTP_STOP; + + (void)smtpcode; + (void)instate; /* no use for this yet */ + + /* Remove the offending mechanism from the supported list */ + smtpc->authmechs ^= smtpc->authused; + + /* Calculate alternative SASL login details */ + result = smtp_calc_sasl_details(conn, &mech, &initresp, &len, &state1, + &state2); + + if(!result) { + /* Do we have any mechanisms left? */ + if(mech) { + /* Retry SASL based authentication */ + result = smtp_perform_auth(conn, mech, initresp, len, state1, state2); + + Curl_safefree(initresp); + } + else { + failf(data, "Authentication cancelled"); + + result = CURLE_LOGIN_DENIED; + } + } + + return result; +} + +/* For final responses in the AUTH sequence */ +static CURLcode smtp_state_auth_final_resp(struct connectdata *conn, + int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + + (void)instate; /* no use for this yet */ + + if(smtpcode != 235) { + failf(data, "Authentication failed: %d", smtpcode); + result = CURLE_LOGIN_DENIED; + } + else + /* End of connect phase */ + state(conn, SMTP_STOP); + + return result; +} + +/* For command responses */ +static CURLcode smtp_state_command_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct SMTP *smtp = data->req.protop; + char *line = data->state.buffer; + size_t len = strlen(line); + + (void)instate; /* no use for this yet */ + + if((smtp->rcpt && smtpcode/100 != 2 && smtpcode != 553 && smtpcode != 1) || + (!smtp->rcpt && smtpcode/100 != 2 && smtpcode != 1)) { + failf(data, "Command failed: %d", smtpcode); + result = CURLE_RECV_ERROR; + } + else { + /* Temporarily add the LF character back and send as body to the client */ + if(!data->set.opt_no_body) { + line[len] = '\n'; + result = Curl_client_write(conn, CLIENTWRITE_BODY, line, len + 1); + line[len] = '\0'; + } + + if(smtpcode != 1) { + if(smtp->rcpt) { + smtp->rcpt = smtp->rcpt->next; + + if(smtp->rcpt) { + /* Send the next command */ + result = smtp_perform_command(conn); + } + else + /* End of DO phase */ + state(conn, SMTP_STOP); + } + else + /* End of DO phase */ + state(conn, SMTP_STOP); + } + } + + return result; +} + +/* For MAIL responses */ +static CURLcode smtp_state_mail_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/* For RCPT responses */ +static CURLcode smtp_state_rcpt_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/* For DATA response */ +static CURLcode smtp_state_data_resp(struct connectdata *conn, int smtpcode, + smtpstate instate) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/* For POSTDATA responses, which are received after the entire DATA + part has been sent to the server */ +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; +} + +static CURLcode smtp_statemach_act(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + curl_socket_t sock = conn->sock[FIRSTSOCKET]; + struct SessionHandle *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_PLAIN: + result = smtp_state_auth_plain_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_LOGIN: + result = smtp_state_auth_login_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_LOGIN_PASSWD: + result = smtp_state_auth_login_password_resp(conn, smtpcode, + smtpc->state); + break; + +#ifndef CURL_DISABLE_CRYPTO_AUTH + case SMTP_AUTH_CRAMMD5: + result = smtp_state_auth_cram_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_DIGESTMD5: + result = smtp_state_auth_digest_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_DIGESTMD5_RESP: + result = smtp_state_auth_digest_resp_resp(conn, smtpcode, smtpc->state); + break; +#endif + +#ifdef USE_NTLM + case SMTP_AUTH_NTLM: + result = smtp_state_auth_ntlm_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_NTLM_TYPE2MSG: + result = smtp_state_auth_ntlm_type2msg_resp(conn, smtpcode, + smtpc->state); + break; +#endif + +#if defined(USE_WINDOWS_SSPI) + case SMTP_AUTH_GSSAPI: + result = smtp_state_auth_gssapi_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_GSSAPI_TOKEN: + result = smtp_state_auth_gssapi_token_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_GSSAPI_NO_DATA: + result = smtp_state_auth_gssapi_no_data_resp(conn, smtpcode, + smtpc->state); + break; +#endif + + case SMTP_AUTH_XOAUTH2: + result = smtp_state_auth_xoauth2_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_CANCEL: + result = smtp_state_auth_cancel_resp(conn, smtpcode, smtpc->state); + break; + + case SMTP_AUTH_FINAL: + result = smtp_state_auth_final_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; +} + +/* Called repeatedly until done from multi.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; +} + +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; +} + +/* Allocate and initialize the SMTP struct for the current SessionHandle if + required */ +static CURLcode smtp_init(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct SMTP *smtp; + + smtp = data->req.protop = calloc(sizeof(struct SMTP), 1); + if(!smtp) + result = CURLE_OUT_OF_MEMORY; + + return result; +} + +/* For the SMTP "protocol connect" and "doing" phases only */ +static int smtp_getsock(struct connectdata *conn, curl_socket_t *socks, + int numsocks) +{ + return Curl_pp_getsock(&conn->proto.smtpc.pp, socks, numsocks); +} + +/*********************************************************************** + * + * smtp_connect() + * + * This function should do everything that is to be considered a part of + * the connection phase. + * + * The variable pointed to by 'done' will be TRUE if the protocol-layer + * connect phase is done when this function returns, or FALSE if not. + */ +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; + + /* Set the default preferred authentication mechanism */ + smtpc->prefmech = SASL_AUTH_ANY; + + /* 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; +} + +/*********************************************************************** + * + * smtp_done() + * + * The DONE function. This does what needs to be done after a single DO has + * performed. + * + * Input argument is already checked for validity. + */ +static CURLcode smtp_done(struct connectdata *conn, CURLcode status, + bool premature) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct SMTP *smtp = data->req.protop; + struct pingpong *pp = &conn->proto.smtpc.pp; + const char *eob; + ssize_t len; + ssize_t bytes_written; + + (void)premature; + + if(!smtp || !pp->conn) + /* When the easy handle is removed from the multi interface while libcurl + is still trying to resolve the host name, the SMTP struct is not yet + initialized. However, the removal action calls Curl_done() which in + turn calls this function, so we simply return success. */ + return CURLE_OK; + + 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.upload && data->set.mail_rcpt) { + /* 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. */ + eob = SMTP_EOB; + len = SMTP_EOB_LEN; + if(smtp->trailing_crlf || !conn->data->state.infilesize) { + eob += 2; + len -= 2; + } + + /* Send the end of block data */ + result = Curl_write(conn, conn->writesockfd, eob, len, &bytes_written); + if(result) + return result; + + if(bytes_written != len) { + /* The whole chunk was not sent so keep it around and adjust the + pingpong structure accordingly */ + pp->sendthis = strdup(eob); + pp->sendsize = len; + pp->sendleft = len - bytes_written; + } + else + /* Successfully sent so adjust the response timeout relative to now */ + pp->response = Curl_tvnow(); + + 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, not in the multi state machine and with + Curl_done() invokes on several places in the code! + */ + result = smtp_block_statemach(conn); + } + + /* Cleanup our per-request based variables */ + Curl_safefree(smtp->custom); + + /* Clear the transfer mode for the next request */ + smtp->transfer = FTPTRANSFER_BODY; + + return result; +} + +/*********************************************************************** + * + * smtp_perform() + * + * This is the actual DO function for SMTP. Transfer a mail, send a command + * or get some data according to the options previously setup. + */ +static CURLcode smtp_perform(struct connectdata *conn, bool *connected, + bool *dophase_done) +{ + /* This is SMTP and no proxy */ + CURLcode result = CURLE_OK; + struct SessionHandle *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; + + /* Start the first command in the DO phase */ + if(data->set.upload && 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; +} + +/*********************************************************************** + * + * smtp_do() + * + * This function is registered as 'curl_do' function. It decodes the path + * parts etc as a wrapper to the actual DO function (smtp_perform). + * + * The input argument is already checked for validity. + */ +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; +} + +/*********************************************************************** + * + * smtp_disconnect() + * + * Disconnect from an SMTP server. Cleanup protocol-specific per-connection + * resources. BLOCKING. + */ +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->authused); + + /* Cleanup our connection based variables */ + Curl_safefree(smtpc->domain); + + return CURLE_OK; +} + +/* Call this when the DO phase has completed */ +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; +} + +/* Called from multi.c while DOing */ +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; +} + +/*********************************************************************** + * + * smtp_regular_transfer() + * + * The input argument is already checked for validity. + * + * Performs all commands done before a regular transfer between a local and a + * remote host. + */ +static CURLcode smtp_regular_transfer(struct connectdata *conn, + bool *dophase_done) +{ + CURLcode result = CURLE_OK; + bool connected = FALSE; + struct SessionHandle *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; +} + +static CURLcode smtp_setup_connection(struct connectdata *conn) +{ + struct SessionHandle *data = conn->data; + CURLcode result; + + if(conn->bits.httpproxy && !data->set.tunnel_thru_httpproxy) { + /* Unless we have asked to tunnel SMTP operations through the proxy, we + switch and use HTTP operations only */ +#ifndef CURL_DISABLE_HTTP + if(conn->handler == &Curl_handler_smtp) + conn->handler = &Curl_handler_smtp_proxy; + else { +#ifdef USE_SSL + conn->handler = &Curl_handler_smtps_proxy; +#else + failf(data, "SMTPS not supported!"); + return CURLE_UNSUPPORTED_PROTOCOL; +#endif + } + /* set it up as a HTTP connection instead */ + return conn->handler->setup_connection(conn); + +#else + failf(data, "SMTP over http proxy requires HTTP support built-in!"); + return CURLE_UNSUPPORTED_PROTOCOL; +#endif + } + + /* Initialise the SMTP layer */ + result = smtp_init(conn); + if(result) + return result; + + data->state.path++; /* don't include the initial slash */ + + return CURLE_OK; +} + +/*********************************************************************** + * + * smtp_parse_url_options() + * + * Parse the URL login options. + */ +static CURLcode smtp_parse_url_options(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct smtp_conn *smtpc = &conn->proto.smtpc; + const char *options = conn->options; + const char *ptr = options; + bool reset = TRUE; + + while(ptr && *ptr) { + const char *key = ptr; + + while(*ptr && *ptr != '=') + ptr++; + + if(strnequal(key, "AUTH", 4)) { + size_t len = 0; + const char *value = ++ptr; + + if(reset) { + reset = FALSE; + smtpc->prefmech = SASL_AUTH_NONE; + } + + while(*ptr && *ptr != ';') { + ptr++; + len++; + } + + if(strnequal(value, "*", len)) + smtpc->prefmech = SASL_AUTH_ANY; + else if(strnequal(value, SASL_MECH_STRING_LOGIN, len)) + smtpc->prefmech |= SASL_MECH_LOGIN; + else if(strnequal(value, SASL_MECH_STRING_PLAIN, len)) + smtpc->prefmech |= SASL_MECH_PLAIN; + else if(strnequal(value, SASL_MECH_STRING_CRAM_MD5, len)) + smtpc->prefmech |= SASL_MECH_CRAM_MD5; + else if(strnequal(value, SASL_MECH_STRING_DIGEST_MD5, len)) + smtpc->prefmech |= SASL_MECH_DIGEST_MD5; + else if(strnequal(value, SASL_MECH_STRING_GSSAPI, len)) + smtpc->prefmech |= SASL_MECH_GSSAPI; + else if(strnequal(value, SASL_MECH_STRING_NTLM, len)) + smtpc->prefmech |= SASL_MECH_NTLM; + else if(strnequal(value, SASL_MECH_STRING_XOAUTH2, len)) + smtpc->prefmech |= SASL_MECH_XOAUTH2; + + if(*ptr == ';') + ptr++; + } + else + result = CURLE_URL_MALFORMAT; + } + + return result; +} + +/*********************************************************************** + * + * smtp_parse_url_path() + * + * Parse the URL path into separate path components. + */ +static CURLcode smtp_parse_url_path(struct connectdata *conn) +{ + /* The SMTP struct is already initialised in smtp_connect() */ + struct SessionHandle *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); +} + +/*********************************************************************** + * + * smtp_parse_custom_request() + * + * Parse the custom request. + */ +static CURLcode smtp_parse_custom_request(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *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; +} + +/*********************************************************************** + * + * smtp_calc_sasl_details() + * + * Calculate the required login details for SASL authentication. + */ +static CURLcode smtp_calc_sasl_details(struct connectdata *conn, + const char **mech, + char **initresp, size_t *len, + smtpstate *state1, smtpstate *state2) +{ + CURLcode result = CURLE_OK; + struct SessionHandle *data = conn->data; + struct smtp_conn *smtpc = &conn->proto.smtpc; + + /* Calculate the supported authentication mechanism, by decreasing order of + security, as well as the initial response where appropriate */ +#if defined(USE_WINDOWS_SSPI) + if((smtpc->authmechs & SASL_MECH_GSSAPI) && + (smtpc->prefmech & SASL_MECH_GSSAPI)) { + smtpc->mutual_auth = FALSE; /* TODO: Calculate mutual authentication */ + + *mech = SASL_MECH_STRING_GSSAPI; + *state1 = SMTP_AUTH_GSSAPI; + *state2 = SMTP_AUTH_GSSAPI_TOKEN; + smtpc->authused = SASL_MECH_GSSAPI; + + if(data->set.sasl_ir) + result = Curl_sasl_create_gssapi_user_message(data, conn->user, + conn->passwd, "smtp", + smtpc->mutual_auth, + NULL, &conn->krb5, + initresp, len); + } + else +#endif +#ifndef CURL_DISABLE_CRYPTO_AUTH + if((smtpc->authmechs & SASL_MECH_DIGEST_MD5) && + (smtpc->prefmech & SASL_MECH_DIGEST_MD5)) { + *mech = SASL_MECH_STRING_DIGEST_MD5; + *state1 = SMTP_AUTH_DIGESTMD5; + smtpc->authused = SASL_MECH_DIGEST_MD5; + } + else if((smtpc->authmechs & SASL_MECH_CRAM_MD5) && + (smtpc->prefmech & SASL_MECH_CRAM_MD5)) { + *mech = SASL_MECH_STRING_CRAM_MD5; + *state1 = SMTP_AUTH_CRAMMD5; + smtpc->authused = SASL_MECH_CRAM_MD5; + } + else +#endif +#ifdef USE_NTLM + if((smtpc->authmechs & SASL_MECH_NTLM) && + (smtpc->prefmech & SASL_MECH_NTLM)) { + *mech = SASL_MECH_STRING_NTLM; + *state1 = SMTP_AUTH_NTLM; + *state2 = SMTP_AUTH_NTLM_TYPE2MSG; + smtpc->authused = SASL_MECH_NTLM; + + if(data->set.sasl_ir) + result = Curl_sasl_create_ntlm_type1_message(conn->user, conn->passwd, + &conn->ntlm, + initresp, len); + } + else +#endif + if(((smtpc->authmechs & SASL_MECH_XOAUTH2) && + (smtpc->prefmech & SASL_MECH_XOAUTH2) && + (smtpc->prefmech != SASL_AUTH_ANY)) || conn->xoauth2_bearer) { + *mech = SASL_MECH_STRING_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(data, conn->user, + conn->xoauth2_bearer, + initresp, len); + } + else if((smtpc->authmechs & SASL_MECH_LOGIN) && + (smtpc->prefmech & SASL_MECH_LOGIN)) { + *mech = SASL_MECH_STRING_LOGIN; + *state1 = SMTP_AUTH_LOGIN; + *state2 = SMTP_AUTH_LOGIN_PASSWD; + smtpc->authused = SASL_MECH_LOGIN; + + if(data->set.sasl_ir) + result = Curl_sasl_create_login_message(data, conn->user, initresp, len); + } + else if((smtpc->authmechs & SASL_MECH_PLAIN) && + (smtpc->prefmech & SASL_MECH_PLAIN)) { + *mech = SASL_MECH_STRING_PLAIN; + *state1 = SMTP_AUTH_PLAIN; + *state2 = SMTP_AUTH_FINAL; + smtpc->authused = SASL_MECH_PLAIN; + + if(data->set.sasl_ir) + result = Curl_sasl_create_plain_message(data, conn->user, conn->passwd, + initresp, len); + } + + return result; +} + +CURLcode Curl_smtp_escape_eob(struct connectdata *conn, ssize_t nread) +{ + /* When sending a SMTP payload we must detect CRLF. sequences making sure + they are sent as CRLF.. instead, as a . on the beginning of a line will + be deleted by the server when not part of an EOB terminator and a + genuine CRLF.CRLF which isn't escaped will wrongly be detected as end of + data by the server + */ + ssize_t i; + ssize_t si; + struct SessionHandle *data = conn->data; + struct SMTP *smtp = data->req.protop; + + /* Do we need to allocate the scatch buffer? */ + if(!data->state.scratch) { + data->state.scratch = malloc(2 * BUFSIZE); + + if(!data->state.scratch) { + failf (data, "Failed to alloc scratch buffer!"); + return CURLE_OUT_OF_MEMORY; + } + } + + /* This loop can be improved by some kind of Boyer-Moore style of + approach but that is saved for later... */ + for(i = 0, si = 0; i < nread; i++) { + if(SMTP_EOB[smtp->eob] == data->req.upload_fromhere[i]) { + smtp->eob++; + + /* Is the EOB potentially the terminating CRLF? */ + if(2 == smtp->eob || SMTP_EOB_LEN == smtp->eob) + smtp->trailing_crlf = TRUE; + else + smtp->trailing_crlf = FALSE; + } + else if(smtp->eob) { + /* A previous substring matched so output that first */ + memcpy(&data->state.scratch[si], SMTP_EOB, smtp->eob); + si += smtp->eob; + + /* Then compare the first byte */ + if(SMTP_EOB[0] == data->req.upload_fromhere[i]) + smtp->eob = 1; + else + smtp->eob = 0; + + /* Reset the trailing CRLF flag as there was more data */ + smtp->trailing_crlf = FALSE; + } + + /* Do we have a match for CRLF. as per RFC-5321, sect. 4.5.2 */ + if(SMTP_EOB_FIND_LEN == smtp->eob) { + /* Copy the replacement data to the target buffer */ + memcpy(&data->state.scratch[si], SMTP_EOB_REPL, SMTP_EOB_REPL_LEN); + si += SMTP_EOB_REPL_LEN; + smtp->eob = 0; + } + else if(!smtp->eob) + data->state.scratch[si++] = data->req.upload_fromhere[i]; + } + + if(smtp->eob) { + /* A substring matched before processing ended so output that now */ + memcpy(&data->state.scratch[si], SMTP_EOB, smtp->eob); + si += smtp->eob; + smtp->eob = 0; + } + + if(si != nread) { + /* Only use the new buffer if we replaced something */ + nread = si; + + /* Upload from the new (replaced) buffer instead */ + data->req.upload_fromhere = data->state.scratch; + + /* Set the new amount too */ + data->req.upload_present = nread; + } + + return CURLE_OK; +} + +#endif /* CURL_DISABLE_SMTP */ |