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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Rasmus Lerdorf <rasmus@php.net> |
+----------------------------------------------------------------------+
*/
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include <time.h>
#include "php.h"
#include "ext/standard/info.h"
#include "ext/standard/php_string.h"
#include "ext/standard/basic_functions.h"
#include "ext/date/php_date.h"
#include "zend_smart_str.h"
#ifdef HAVE_SYSEXITS_H
# include <sysexits.h>
#endif
#ifdef HAVE_SYS_SYSEXITS_H
# include <sys/sysexits.h>
#endif
#if PHP_SIGCHILD
# include <signal.h>
#endif
#include "php_syslog.h"
#include "php_mail.h"
#include "php_ini.h"
#include "exec.h"
#ifdef PHP_WIN32
# include "win32/sendmail.h"
#endif
#define SKIP_LONG_HEADER_SEP(str, pos) \
if (str[pos] == '\r' && str[pos + 1] == '\n' && (str[pos + 2] == ' ' || str[pos + 2] == '\t')) { \
pos += 2; \
while (str[pos + 1] == ' ' || str[pos + 1] == '\t') { \
pos++; \
} \
continue; \
} \
extern zend_long php_getuid(void);
typedef enum {
NO_HEADER_ERROR,
CONTAINS_LF_ONLY,
CONTAINS_CR_ONLY,
CONTAINS_CRLF,
CONTAINS_NULL
} php_mail_header_value_error_type;
static php_mail_header_value_error_type php_mail_build_headers_check_field_value(zval *val)
{
size_t len = 0;
zend_string *value = Z_STR_P(val);
/* https://tools.ietf.org/html/rfc2822#section-2.2.1 */
/* https://tools.ietf.org/html/rfc2822#section-2.2.3 */
while (len < value->len) {
if (*(value->val+len) == '\r') {
if (*(value->val+len+1) != '\n') {
return CONTAINS_CR_ONLY;
}
if (value->len - len >= 3
&& (*(value->val+len+2) == ' ' || *(value->val+len+2) == '\t')) {
len += 3;
continue;
}
return CONTAINS_CRLF;
}
/**
* The RFC does not allow using LF alone for folding. However, LF is
* often treated similarly to CRLF, and there are likely many user
* environments that use LF for folding.
* Therefore, considering such an environment, folding with LF alone
* is allowed.
*/
if (*(value->val+len) == '\n') {
if (value->len - len >= 2
&& (*(value->val+len+1) == ' ' || *(value->val+len+1) == '\t')) {
len += 2;
continue;
}
return CONTAINS_LF_ONLY;
}
if (*(value->val+len) == '\0') {
return CONTAINS_NULL;
}
len++;
}
return NO_HEADER_ERROR;
}
static bool php_mail_build_headers_check_field_name(zend_string *key)
{
size_t len = 0;
/* https://tools.ietf.org/html/rfc2822#section-2.2 */
while (len < key->len) {
if (*(key->val+len) < 33 || *(key->val+len) > 126 || *(key->val+len) == ':') {
return FAILURE;
}
len++;
}
return SUCCESS;
}
static void php_mail_build_headers_elems(smart_str *s, zend_string *key, zval *val);
static void php_mail_build_headers_elem(smart_str *s, zend_string *key, zval *val)
{
switch(Z_TYPE_P(val)) {
case IS_STRING:
if (php_mail_build_headers_check_field_name(key) != SUCCESS) {
zend_value_error("Header name \"%s\" contains invalid characters", ZSTR_VAL(key));
return;
}
php_mail_header_value_error_type error_type = php_mail_build_headers_check_field_value(val);
switch (error_type) {
case NO_HEADER_ERROR:
break;
case CONTAINS_LF_ONLY:
zend_value_error("Header \"%s\" contains LF character that is not allowed in the header", ZSTR_VAL(key));
return;
case CONTAINS_CR_ONLY:
zend_value_error("Header \"%s\" contains CR character that is not allowed in the header", ZSTR_VAL(key));
return;
case CONTAINS_CRLF:
zend_value_error("Header \"%s\" contains CRLF characters that are used as a line separator and are not allowed in the header", ZSTR_VAL(key));
return;
case CONTAINS_NULL:
zend_value_error("Header \"%s\" contains NULL character that is not allowed in the header", ZSTR_VAL(key));
return;
default:
// fallback
zend_value_error("Header \"%s\" has invalid format, or contains invalid characters", ZSTR_VAL(key));
return;
}
smart_str_append(s, key);
smart_str_appendl(s, ": ", 2);
smart_str_appends(s, Z_STRVAL_P(val));
smart_str_appendl(s, "\r\n", 2);
break;
case IS_ARRAY:
php_mail_build_headers_elems(s, key, val);
break;
default:
zend_type_error("Header \"%s\" must be of type array|string, %s given", ZSTR_VAL(key), zend_zval_value_name(val));
}
}
static void php_mail_build_headers_elems(smart_str *s, zend_string *key, zval *val)
{
zend_string *tmp_key;
zval *tmp_val;
ZEND_HASH_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(val), tmp_key, tmp_val) {
if (tmp_key) {
zend_type_error("Header \"%s\" must only contain numeric keys, \"%s\" found", ZSTR_VAL(key), ZSTR_VAL(tmp_key));
break;
}
ZVAL_DEREF(tmp_val);
if (Z_TYPE_P(tmp_val) != IS_STRING) {
zend_type_error("Header \"%s\" must only contain values of type string, %s found", ZSTR_VAL(key), zend_zval_value_name(tmp_val));
break;
}
php_mail_build_headers_elem(s, key, tmp_val);
} ZEND_HASH_FOREACH_END();
}
#define PHP_MAIL_BUILD_HEADER_CHECK(target, s, key, val) \
do { \
if (Z_TYPE_P(val) == IS_STRING) { \
php_mail_build_headers_elem(&s, key, val); \
} else if (Z_TYPE_P(val) == IS_ARRAY) { \
if (zend_string_equals_literal_ci(key, target)) { \
zend_type_error("Header \"%s\" must be of type string, array given", target); \
break; \
} \
php_mail_build_headers_elems(&s, key, val); \
} else { \
zend_type_error("Header \"%s\" must be of type array|string, %s given", ZSTR_VAL(key), zend_zval_value_name(val)); \
} \
} while(0)
PHPAPI zend_string *php_mail_build_headers(HashTable *headers)
{
zend_ulong idx;
zend_string *key;
zval *val;
smart_str s = {0};
ZEND_HASH_FOREACH_KEY_VAL(headers, idx, key, val) {
if (!key) {
zend_type_error("Header name cannot be numeric, " ZEND_LONG_FMT " given", idx);
break;
}
ZVAL_DEREF(val);
/* https://tools.ietf.org/html/rfc2822#section-3.6 */
if (zend_string_equals_literal_ci(key, "orig-date")) {
PHP_MAIL_BUILD_HEADER_CHECK("orig-date", s, key, val);
} else if (zend_string_equals_literal_ci(key, "from")) {
PHP_MAIL_BUILD_HEADER_CHECK("from", s, key, val);
} else if (zend_string_equals_literal_ci(key, "sender")) {
PHP_MAIL_BUILD_HEADER_CHECK("sender", s, key, val);
} else if (zend_string_equals_literal_ci(key, "reply-to")) {
PHP_MAIL_BUILD_HEADER_CHECK("reply-to", s, key, val);
} else if (zend_string_equals_literal_ci(key, "to")) {
zend_value_error("The additional headers cannot contain the \"To\" header");
} else if (zend_string_equals_literal_ci(key, "cc")) {
PHP_MAIL_BUILD_HEADER_CHECK("cc", s, key, val);
} else if (zend_string_equals_literal_ci(key, "bcc")) {
PHP_MAIL_BUILD_HEADER_CHECK("bcc", s, key, val);
} else if (zend_string_equals_literal_ci(key, "message-id")) {
PHP_MAIL_BUILD_HEADER_CHECK("message-id", s, key, val);
} else if (zend_string_equals_literal_ci(key, "references")) {
PHP_MAIL_BUILD_HEADER_CHECK("references", s, key, val);
} else if (zend_string_equals_literal_ci(key, "in-reply-to")) {
PHP_MAIL_BUILD_HEADER_CHECK("in-reply-to", s, key, val);
} else if (zend_string_equals_literal_ci(key, "subject")) {
zend_value_error("The additional headers cannot contain the \"Subject\" header");
} else {
if (Z_TYPE_P(val) == IS_STRING) {
php_mail_build_headers_elem(&s, key, val);
} else if (Z_TYPE_P(val) == IS_ARRAY) {
php_mail_build_headers_elems(&s, key, val);
} else {
zend_type_error("Header \"%s\" must be of type array|string, %s given", ZSTR_VAL(key), zend_zval_value_name(val));
}
}
if (EG(exception)) {
smart_str_free(&s);
return NULL;
}
} ZEND_HASH_FOREACH_END();
/* Remove the last \r\n */
if (s.s) s.s->len -= 2;
smart_str_0(&s);
return s.s;
}
/* {{{ Send an email message */
PHP_FUNCTION(mail)
{
char *to=NULL, *message=NULL;
char *subject=NULL;
zend_string *extra_cmd=NULL;
zend_string *headers_str = NULL;
HashTable *headers_ht = NULL;
size_t to_len, message_len;
size_t subject_len, i;
char *to_r, *subject_r;
ZEND_PARSE_PARAMETERS_START(3, 5)
Z_PARAM_PATH(to, to_len)
Z_PARAM_PATH(subject, subject_len)
Z_PARAM_PATH(message, message_len)
Z_PARAM_OPTIONAL
Z_PARAM_ARRAY_HT_OR_STR(headers_ht, headers_str)
Z_PARAM_PATH_STR(extra_cmd)
ZEND_PARSE_PARAMETERS_END();
if (headers_str) {
if (strlen(ZSTR_VAL(headers_str)) != ZSTR_LEN(headers_str)) {
zend_argument_value_error(4, "must not contain any null bytes");
RETURN_THROWS();
}
headers_str = php_trim(headers_str, NULL, 0, 2);
} else if (headers_ht) {
headers_str = php_mail_build_headers(headers_ht);
if (EG(exception)) {
RETURN_THROWS();
}
}
if (to_len > 0) {
to_r = estrndup(to, to_len);
for (; to_len; to_len--) {
if (!isspace((unsigned char) to_r[to_len - 1])) {
break;
}
to_r[to_len - 1] = '\0';
}
for (i = 0; to_r[i]; i++) {
if (iscntrl((unsigned char) to_r[i])) {
/* According to RFC 822, section 3.1.1 long headers may be separated into
* parts using CRLF followed at least one linear-white-space character ('\t' or ' ').
* To prevent these separators from being replaced with a space, we use the
* SKIP_LONG_HEADER_SEP to skip over them. */
SKIP_LONG_HEADER_SEP(to_r, i);
to_r[i] = ' ';
}
}
} else {
to_r = to;
}
if (subject_len > 0) {
subject_r = estrndup(subject, subject_len);
for (; subject_len; subject_len--) {
if (!isspace((unsigned char) subject_r[subject_len - 1])) {
break;
}
subject_r[subject_len - 1] = '\0';
}
for (i = 0; subject_r[i]; i++) {
if (iscntrl((unsigned char) subject_r[i])) {
SKIP_LONG_HEADER_SEP(subject_r, i);
subject_r[i] = ' ';
}
}
} else {
subject_r = subject;
}
zend_string *force_extra_parameters = zend_ini_str_ex("mail.force_extra_parameters", strlen("mail.force_extra_parameters"), false, NULL);
if (force_extra_parameters) {
extra_cmd = php_escape_shell_cmd(force_extra_parameters);
} else if (extra_cmd) {
extra_cmd = php_escape_shell_cmd(extra_cmd);
}
if (php_mail(to_r, subject_r, message, headers_str && ZSTR_LEN(headers_str) ? ZSTR_VAL(headers_str) : NULL, extra_cmd ? ZSTR_VAL(extra_cmd) : NULL)) {
RETVAL_TRUE;
} else {
RETVAL_FALSE;
}
if (headers_str) {
zend_string_release_ex(headers_str, 0);
}
if (extra_cmd) {
zend_string_release_ex(extra_cmd, 0);
}
if (to_r != to) {
efree(to_r);
}
if (subject_r != subject) {
efree(subject_r);
}
}
/* }}} */
static void php_mail_log_crlf_to_spaces(char *message) {
/* Find all instances of carriage returns or line feeds and
* replace them with spaces. Thus, a log line is always one line
* long
*/
char *p = message;
while ((p = strpbrk(p, "\r\n"))) {
*p = ' ';
}
}
static void php_mail_log_to_syslog(char *message) {
/* Write 'message' to syslog. */
#ifdef HAVE_SYSLOG_H
php_syslog(LOG_NOTICE, "%s", message);
#endif
}
static void php_mail_log_to_file(char *filename, char *message, size_t message_size) {
/* Write 'message' to the given file. */
uint32_t flags = REPORT_ERRORS | STREAM_DISABLE_OPEN_BASEDIR;
php_stream *stream = php_stream_open_wrapper(filename, "a", flags, NULL);
if (stream) {
php_stream_write(stream, message, message_size);
php_stream_close(stream);
}
}
static int php_mail_detect_multiple_crlf(const char *hdr) {
/* This function detects multiple/malformed multiple newlines. */
if (!hdr || !strlen(hdr)) {
return 0;
}
/* Should not have any newlines at the beginning. */
/* RFC 2822 2.2. Header Fields */
if (*hdr < 33 || *hdr > 126 || *hdr == ':') {
return 1;
}
while(*hdr) {
if (*hdr == '\r') {
if (*(hdr+1) == '\0' || *(hdr+1) == '\r' || (*(hdr+1) == '\n' && (*(hdr+2) == '\0' || *(hdr+2) == '\n' || *(hdr+2) == '\r'))) {
/* Malformed or multiple newlines. */
return 1;
} else {
hdr += 2;
}
} else if (*hdr == '\n') {
if (*(hdr+1) == '\0' || *(hdr+1) == '\r' || *(hdr+1) == '\n') {
/* Malformed or multiple newlines. */
return 1;
} else {
hdr += 2;
}
} else {
hdr++;
}
}
return 0;
}
/* {{{ php_mail */
PHPAPI bool php_mail(const char *to, const char *subject, const char *message, const char *headers, const char *extra_cmd)
{
FILE *sendmail;
char *sendmail_path = INI_STR("sendmail_path");
char *sendmail_cmd = NULL;
char *mail_log = INI_STR("mail.log");
const char *hdr = headers;
char *ahdr = NULL;
#if PHP_SIGCHILD
void (*sig_handler)() = NULL;
#endif
#define MAIL_RET(val) \
if (ahdr != NULL) { \
efree(ahdr); \
} \
return val; \
if (mail_log && *mail_log) {
char *logline;
spprintf(&logline, 0, "mail() on [%s:%d]: To: %s -- Headers: %s -- Subject: %s", zend_get_executed_filename(), zend_get_executed_lineno(), to, hdr ? hdr : "", subject);
if (hdr) {
php_mail_log_crlf_to_spaces(logline);
}
if (!strcmp(mail_log, "syslog")) {
php_mail_log_to_syslog(logline);
} else {
/* Add date when logging to file */
char *tmp;
time_t curtime;
zend_string *date_str;
size_t len;
time(&curtime);
date_str = php_format_date("d-M-Y H:i:s e", 13, curtime, 1);
len = spprintf(&tmp, 0, "[%s] %s%s", date_str->val, logline, PHP_EOL);
php_mail_log_to_file(mail_log, tmp, len);
zend_string_free(date_str);
efree(tmp);
}
efree(logline);
}
if (EG(exception)) {
MAIL_RET(false);
}
char *line_sep = PG(mail_mixed_lf_and_crlf) ? "\n" : "\r\n";
if (PG(mail_x_header)) {
const char *tmp = zend_get_executed_filename();
zend_string *f;
f = php_basename(tmp, strlen(tmp), NULL, 0);
if (headers != NULL && *headers) {
spprintf(&ahdr, 0, "X-PHP-Originating-Script: " ZEND_LONG_FMT ":%s%s%s", php_getuid(), ZSTR_VAL(f), line_sep, headers);
} else {
spprintf(&ahdr, 0, "X-PHP-Originating-Script: " ZEND_LONG_FMT ":%s", php_getuid(), ZSTR_VAL(f));
}
hdr = ahdr;
zend_string_release_ex(f, 0);
}
if (hdr && php_mail_detect_multiple_crlf(hdr)) {
php_error_docref(NULL, E_WARNING, "Multiple or malformed newlines found in additional_header");
MAIL_RET(false);
}
if (!sendmail_path) {
#ifdef PHP_WIN32
int tsm_err;
char *tsm_errmsg = NULL;
/* handle old style win smtp sending */
if (TSendMail(INI_STR("SMTP"), &tsm_err, &tsm_errmsg, hdr, subject, to, message, NULL, NULL, NULL) == FAILURE) {
if (tsm_errmsg) {
php_error_docref(NULL, E_WARNING, "%s", tsm_errmsg);
efree(tsm_errmsg);
} else {
php_error_docref(NULL, E_WARNING, "%s", GetSMErrorText(tsm_err));
}
MAIL_RET(false);
}
MAIL_RET(true);
#else
MAIL_RET(false);
#endif
}
if (extra_cmd != NULL) {
spprintf(&sendmail_cmd, 0, "%s %s", sendmail_path, extra_cmd);
} else {
sendmail_cmd = sendmail_path;
}
#if PHP_SIGCHILD
/* Set signal handler of SIGCHLD to default to prevent other signal handlers
* from being called and reaping the return code when our child exits.
* The original handler needs to be restored after pclose() */
sig_handler = (void *)signal(SIGCHLD, SIG_DFL);
if (sig_handler == SIG_ERR) {
sig_handler = NULL;
}
#endif
#ifdef PHP_WIN32
sendmail = popen_ex(sendmail_cmd, "wb", NULL, NULL);
#else
/* Since popen() doesn't indicate if the internal fork() doesn't work
* (e.g. the shell can't be executed) we explicitly set it to 0 to be
* sure we don't catch any older errno value. */
errno = 0;
sendmail = popen(sendmail_cmd, "w");
#endif
if (extra_cmd != NULL) {
efree (sendmail_cmd);
}
if (sendmail) {
#ifndef PHP_WIN32
if (EACCES == errno) {
php_error_docref(NULL, E_WARNING, "Permission denied: unable to execute shell to run mail delivery binary '%s'", sendmail_path);
pclose(sendmail);
#if PHP_SIGCHILD
/* Restore handler in case of error on Windows
Not sure if this applicable on Win but just in case. */
if (sig_handler) {
signal(SIGCHLD, sig_handler);
}
#endif
MAIL_RET(false);
}
#endif
fprintf(sendmail, "To: %s%s", to, line_sep);
fprintf(sendmail, "Subject: %s%s", subject, line_sep);
if (hdr != NULL) {
fprintf(sendmail, "%s%s", hdr, line_sep);
}
fprintf(sendmail, "%s%s%s", line_sep, message, line_sep);
int ret = pclose(sendmail);
#if PHP_SIGCHILD
if (sig_handler) {
signal(SIGCHLD, sig_handler);
}
#endif
#ifdef PHP_WIN32
if (ret == -1)
#else
#if defined(EX_TEMPFAIL)
if ((ret != EX_OK)&&(ret != EX_TEMPFAIL))
#elif defined(EX_OK)
if (ret != EX_OK)
#else
if (ret != 0)
#endif
#endif
{
MAIL_RET(false);
} else {
MAIL_RET(true);
}
} else {
php_error_docref(NULL, E_WARNING, "Could not execute mail delivery program '%s'", sendmail_path);
#if PHP_SIGCHILD
if (sig_handler) {
signal(SIGCHLD, sig_handler);
}
#endif
MAIL_RET(false);
}
MAIL_RET(true); /* never reached */
}
/* }}} */
/* {{{ PHP_MINFO_FUNCTION */
PHP_MINFO_FUNCTION(mail)
{
char *sendmail_path = INI_STR("sendmail_path");
#ifdef PHP_WIN32
if (!sendmail_path) {
php_info_print_table_row(2, "Internal Sendmail Support for Windows", "enabled");
} else {
php_info_print_table_row(2, "Path to sendmail", sendmail_path);
}
#else
php_info_print_table_row(2, "Path to sendmail", sendmail_path);
#endif
}
/* }}} */
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