/src/php-src/main/rfc1867.c

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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.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
   |          Jani Taskinen <jani@php.net>                                |
   +----------------------------------------------------------------------+
 */

/*
 *  This product includes software developed by the Apache Group
 *  for use in the Apache HTTP server project (http://www.apache.org/).
 *
 */

#include <stdio.h>
#include "php.h"
#include "php_open_temporary_file.h"
#include "zend_globals.h"
#include "php_globals.h"
#include "php_variables.h"
#include "rfc1867.h"
#include "zend_smart_string.h"

#ifndef DEBUG_FILE_UPLOAD
# define DEBUG_FILE_UPLOAD 0
#endif

static int dummy_encoding_translation(void)
{
  return 0;
}

static char *php_ap_getword(const zend_encoding *encoding, char **line, char stop);
static char *php_ap_getword_conf(const zend_encoding *encoding, char *str);

static php_rfc1867_encoding_translation_t php_rfc1867_encoding_translation = dummy_encoding_translation;
static php_rfc1867_get_detect_order_t php_rfc1867_get_detect_order = NULL;
static php_rfc1867_set_input_encoding_t php_rfc1867_set_input_encoding = NULL;
static php_rfc1867_getword_t php_rfc1867_getword = php_ap_getword;
static php_rfc1867_getword_conf_t php_rfc1867_getword_conf = php_ap_getword_conf;
static php_rfc1867_basename_t php_rfc1867_basename = NULL;

PHPAPI int (*php_rfc1867_callback)(unsigned int event, void *event_data, void **extra) = NULL;

static void safe_php_register_variable(char *var, char *strval, size_t val_len, zval *track_vars_array, bool override_protection);

/* The longest property name we use in an uploaded file array */
#define MAX_SIZE_OF_INDEX sizeof("[full_path]")

/* The longest anonymous name */
#define MAX_SIZE_ANONNAME 33

/* Errors */
#define UPLOAD_ERROR_OK   0  /* File upload successful */
#define UPLOAD_ERROR_A    1  /* Uploaded file exceeded upload_max_filesize */
#define UPLOAD_ERROR_B    2  /* Uploaded file exceeded MAX_FILE_SIZE */
#define UPLOAD_ERROR_C    3  /* Partially uploaded */
#define UPLOAD_ERROR_D    4  /* No file uploaded */
#define UPLOAD_ERROR_E    6  /* Missing /tmp or similar directory */
#define UPLOAD_ERROR_F    7  /* Failed to write file to disk */
#define UPLOAD_ERROR_X    8  /* File upload stopped by extension */

void php_rfc1867_register_constants(void) /* {{{ */
{
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_OK",         UPLOAD_ERROR_OK, CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_INI_SIZE",   UPLOAD_ERROR_A,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_FORM_SIZE",  UPLOAD_ERROR_B,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_PARTIAL",    UPLOAD_ERROR_C,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_NO_FILE",    UPLOAD_ERROR_D,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_NO_TMP_DIR", UPLOAD_ERROR_E,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_CANT_WRITE", UPLOAD_ERROR_F,  CONST_CS | CONST_PERSISTENT);
  REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_EXTENSION",  UPLOAD_ERROR_X,  CONST_CS | CONST_PERSISTENT);
}
/* }}} */

static void normalize_protected_variable(char *varname) /* {{{ */
{
  char *s = varname, *index = NULL, *indexend = NULL, *p;

  /* skip leading space */
  while (*s == ' ') {
    s++;
  }

  /* and remove it */
  if (s != varname) {
    memmove(varname, s, strlen(s)+1);
  }

  for (p = varname; *p && *p != '['; p++) {
    switch(*p) {
      case ' ':
      case '.':
        *p = '_';
        break;
    }
  }

  /* find index */
  index = strchr(varname, '[');
  if (index) {
    index++;
    s = index;
  } else {
    return;
  }

  /* done? */
  while (index) {
    while (*index == ' ' || *index == '\r' || *index == '\n' || *index=='\t') {
      index++;
    }
    indexend = strchr(index, ']');
    indexend = indexend ? indexend + 1 : index + strlen(index);

    if (s != index) {
      memmove(s, index, strlen(index)+1);
      s += indexend-index;
    } else {
      s = indexend;
    }

    if (*s == '[') {
      s++;
      index = s;
    } else {
      index = NULL;
    }
  }
  *s = '\0';
}
/* }}} */

static void add_protected_variable(char *varname) /* {{{ */
{
  normalize_protected_variable(varname);
  zend_hash_str_add_empty_element(&PG(rfc1867_protected_variables), varname, strlen(varname));
}
/* }}} */

static bool is_protected_variable(char *varname) /* {{{ */
{
  normalize_protected_variable(varname);
  return zend_hash_str_exists(&PG(rfc1867_protected_variables), varname, strlen(varname));
}
/* }}} */

static void safe_php_register_variable(char *var, char *strval, size_t val_len, zval *track_vars_array, bool override_protection) /* {{{ */
{
  if (override_protection || !is_protected_variable(var)) {
    php_register_variable_safe(var, strval, val_len, track_vars_array);
  }
}
/* }}} */

static void safe_php_register_variable_ex(char *var, zval *val, zval *track_vars_array, bool override_protection) /* {{{ */
{
  if (override_protection || !is_protected_variable(var)) {
    php_register_variable_ex(var, val, track_vars_array);
  }
}
/* }}} */

static void register_http_post_files_variable(char *strvar, char *val, zval *http_post_files, bool override_protection) /* {{{ */
{
  safe_php_register_variable(strvar, val, strlen(val), http_post_files, override_protection);
}
/* }}} */

static void register_http_post_files_variable_ex(char *var, zval *val, zval *http_post_files, bool override_protection) /* {{{ */
{
  safe_php_register_variable_ex(var, val, http_post_files, override_protection);
}
/* }}} */

static void free_filename(zval *el) {
  zend_string *filename = Z_STR_P(el);
  zend_string_release_ex(filename, 0);
}

PHPAPI void destroy_uploaded_files_hash(void) /* {{{ */
{
  zval *el;

  ZEND_HASH_MAP_FOREACH_VAL(SG(rfc1867_uploaded_files), el) {
    zend_string *filename = Z_STR_P(el);
    VCWD_UNLINK(ZSTR_VAL(filename));
  } ZEND_HASH_FOREACH_END();
  zend_hash_destroy(SG(rfc1867_uploaded_files));
  FREE_HASHTABLE(SG(rfc1867_uploaded_files));
}
/* }}} */

/* {{{ Following code is based on apache_multipart_buffer.c from libapreq-0.33 package. */

#define FILLUNIT (1024 * 5)

typedef struct {

  /* read buffer */
  char *buffer;
  char *buf_begin;
  int  bufsize;
  int  bytes_in_buffer;

  /* boundary info */
  char *boundary;
  char *boundary_next;
  int  boundary_next_len;

  const zend_encoding *input_encoding;
  const zend_encoding **detect_order;
  size_t detect_order_size;
} multipart_buffer;

typedef struct {
  char *key;
  char *value;
} mime_header_entry;

/*
 * Fill up the buffer with client data.
 * Returns number of bytes added to buffer.
 */
static int fill_buffer(multipart_buffer *self)
{
  int bytes_to_read, total_read = 0, actual_read = 0;

  /* shift the existing data if necessary */
  if (self->bytes_in_buffer > 0 && self->buf_begin != self->buffer) {
    memmove(self->buffer, self->buf_begin, self->bytes_in_buffer);
  }

  self->buf_begin = self->buffer;

  /* calculate the free space in the buffer */
  bytes_to_read = self->bufsize - self->bytes_in_buffer;

  /* read the required number of bytes */
  while (bytes_to_read > 0) {

    char *buf = self->buffer + self->bytes_in_buffer;

    actual_read = (int)sapi_module.read_post(buf, bytes_to_read);

    /* update the buffer length */
    if (actual_read > 0) {
      self->bytes_in_buffer += actual_read;
      SG(read_post_bytes) += actual_read;
      total_read += actual_read;
      bytes_to_read -= actual_read;
    } else {
      break;
    }
  }

  return total_read;
}

/* eof if we are out of bytes, or if we hit the final boundary */
static int multipart_buffer_eof(multipart_buffer *self)
{
  return self->bytes_in_buffer == 0 && fill_buffer(self) < 1;
}

/* create new multipart_buffer structure */
static multipart_buffer *multipart_buffer_new(char *boundary, int boundary_len)
{
  multipart_buffer *self = (multipart_buffer *) ecalloc(1, sizeof(multipart_buffer));

  int minsize = boundary_len + 6;
  if (minsize < FILLUNIT) minsize = FILLUNIT;

  self->buffer = (char *) ecalloc(1, minsize + 1);
  self->bufsize = minsize;

  spprintf(&self->boundary, 0, "--%s", boundary);

  self->boundary_next_len = (int)spprintf(&self->boundary_next, 0, "\n--%s", boundary);

  self->buf_begin = self->buffer;
  self->bytes_in_buffer = 0;

  if (php_rfc1867_encoding_translation()) {
    php_rfc1867_get_detect_order(&self->detect_order, &self->detect_order_size);
  } else {
    self->detect_order = NULL;
    self->detect_order_size = 0;
  }

  self->input_encoding = NULL;

  return self;
}

/*
 * Gets the next CRLF terminated line from the input buffer.
 * If it doesn't find a CRLF, and the buffer isn't completely full, returns
 * NULL; otherwise, returns the beginning of the null-terminated line,
 * minus the CRLF.
 *
 * Note that we really just look for LF terminated lines. This works
 * around a bug in internet explorer for the macintosh which sends mime
 * boundaries that are only LF terminated when you use an image submit
 * button in a multipart/form-data form.
 */
static char *next_line(multipart_buffer *self)
{
  /* look for LF in the data */
  char* line = self->buf_begin;
  char* ptr = memchr(self->buf_begin, '\n', self->bytes_in_buffer);

  if (ptr) { /* LF found */

    /* terminate the string, remove CRLF */
    if ((ptr - line) > 0 && *(ptr-1) == '\r') {
      *(ptr-1) = 0;
    } else {
      *ptr = 0;
    }

    /* bump the pointer */
    self->buf_begin = ptr + 1;
    self->bytes_in_buffer -= (self->buf_begin - line);

  } else { /* no LF found */

    /* buffer isn't completely full, fail */
    if (self->bytes_in_buffer < self->bufsize) {
      return NULL;
    }
    /* return entire buffer as a partial line */
    line[self->bufsize] = 0;
    self->buf_begin = ptr;
    self->bytes_in_buffer = 0;
  }

  return line;
}

/* Returns the next CRLF terminated line from the client */
static char *get_line(multipart_buffer *self)
{
  char* ptr = next_line(self);

  if (!ptr) {
    fill_buffer(self);
    ptr = next_line(self);
  }

  return ptr;
}

/* Free header entry */
static void php_free_hdr_entry(mime_header_entry *h)
{
  if (h->key) {
    efree(h->key);
  }
  if (h->value) {
    efree(h->value);
  }
}

/* finds a boundary */
static int find_boundary(multipart_buffer *self, char *boundary)
{
  char *line;

  /* loop through lines */
  while( (line = get_line(self)) )
  {
    /* finished if we found the boundary */
    if (!strcmp(line, boundary)) {
      return 1;
    }
  }

  /* didn't find the boundary */
  return 0;
}

/* parse headers */
static int multipart_buffer_headers(multipart_buffer *self, zend_llist *header)
{
  char *line;
  mime_header_entry entry = {0};
  smart_string buf_value = {0};
  char *key = NULL;

  /* didn't find boundary, abort */
  if (!find_boundary(self, self->boundary)) {
    return 0;
  }

  /* get lines of text, or CRLF_CRLF */

  while ((line = get_line(self)) && line[0] != '\0') {
    /* add header to table */
    char *value = NULL;

    if (php_rfc1867_encoding_translation()) {
      self->input_encoding = zend_multibyte_encoding_detector((const unsigned char *) line, strlen(line), self->detect_order, self->detect_order_size);
    }

    /* space in the beginning means same header */
    if (!isspace(line[0])) {
      value = strchr(line, ':');
    }

    if (value) {
      if (buf_value.c && key) {
        /* new entry, add the old one to the list */
        smart_string_0(&buf_value);
        entry.key = key;
        entry.value = buf_value.c;
        zend_llist_add_element(header, &entry);
        buf_value.c = NULL;
        key = NULL;
      }

      *value = '\0';
      do { value++; } while (isspace(*value));

      key = estrdup(line);
      smart_string_appends(&buf_value, value);
    } else if (buf_value.c) { /* If no ':' on the line, add to previous line */
      smart_string_appends(&buf_value, line);
    } else {
      continue;
    }
  }

  if (buf_value.c && key) {
    /* add the last one to the list */
    smart_string_0(&buf_value);
    entry.key = key;
    entry.value = buf_value.c;
    zend_llist_add_element(header, &entry);
  }

  return 1;
}

static char *php_mime_get_hdr_value(zend_llist header, char *key)
{
  mime_header_entry *entry;

  if (key == NULL) {
    return NULL;
  }

  entry = zend_llist_get_first(&header);
  while (entry) {
    if (!strcasecmp(entry->key, key)) {
      return entry->value;
    }
    entry = zend_llist_get_next(&header);
  }

  return NULL;
}

static char *php_ap_getword(const zend_encoding *encoding, char **line, char stop)
{
  char *pos = *line, quote;
  char *res;

  while (*pos && *pos != stop) {
    if ((quote = *pos) == '"' || quote == '\'') {
      ++pos;
      while (*pos && *pos != quote) {
        if (*pos == '\\' && pos[1] && pos[1] == quote) {
          pos += 2;
        } else {
          ++pos;
        }
      }
      if (*pos) {
        ++pos;
      }
    } else ++pos;
  }
  if (*pos == '\0') {
    res = estrdup(*line);
    *line += strlen(*line);
    return res;
  }

  res = estrndup(*line, pos - *line);

  while (*pos == stop) {
    ++pos;
  }

  *line = pos;
  return res;
}

static char *substring_conf(char *start, int len, char quote)
{
  char *result = emalloc(len + 1);
  char *resp = result;
  int i;

  for (i = 0; i < len && start[i] != quote; ++i) {
    if (start[i] == '\\' && (start[i + 1] == '\\' || (quote && start[i + 1] == quote))) {
      *resp++ = start[++i];
    } else {
      *resp++ = start[i];
    }
  }

  *resp = '\0';
  return result;
}

static char *php_ap_getword_conf(const zend_encoding *encoding, char *str)
{
  while (*str && isspace(*str)) {
    ++str;
  }

  if (!*str) {
    return estrdup("");
  }

  if (*str == '"' || *str == '\'') {
    char quote = *str;

    str++;
    return substring_conf(str, (int)strlen(str), quote);
  } else {
    char *strend = str;

    while (*strend && !isspace(*strend)) {
      ++strend;
    }
    return substring_conf(str, strend - str, 0);
  }
}

static char *php_ap_basename(const zend_encoding *encoding, char *path)
{
  char *s = strrchr(path, '\\');
  char *s2 = strrchr(path, '/');

  if (s && s2) {
    if (s > s2) {
      ++s;
    } else {
      s = ++s2;
    }
    return s;
  } else if (s) {
    return ++s;
  } else if (s2) {
    return ++s2;
  }
  return path;
}

/*
 * Search for a string in a fixed-length byte string.
 * If partial is true, partial matches are allowed at the end of the buffer.
 * Returns NULL if not found, or a pointer to the start of the first match.
 */
static void *php_ap_memstr(char *haystack, int haystacklen, char *needle, int needlen, int partial)
{
  int len = haystacklen;
  char *ptr = haystack;

  /* iterate through first character matches */
  while( (ptr = memchr(ptr, needle[0], len)) ) {

    /* calculate length after match */
    len = haystacklen - (ptr - (char *)haystack);

    /* done if matches up to capacity of buffer */
    if (memcmp(needle, ptr, needlen < len ? needlen : len) == 0 && (partial || len >= needlen)) {
      break;
    }

    /* next character */
    ptr++; len--;
  }

  return ptr;
}

/* read until a boundary condition */
static size_t multipart_buffer_read(multipart_buffer *self, char *buf, size_t bytes, int *end)
{
  size_t len, max;
  char *bound;

  /* fill buffer if needed */
  if (bytes > (size_t)self->bytes_in_buffer) {
    fill_buffer(self);
  }

  /* look for a potential boundary match, only read data up to that point */
  if ((bound = php_ap_memstr(self->buf_begin, self->bytes_in_buffer, self->boundary_next, self->boundary_next_len, 1))) {
    max = bound - self->buf_begin;
    if (end && php_ap_memstr(self->buf_begin, self->bytes_in_buffer, self->boundary_next, self->boundary_next_len, 0)) {
      *end = 1;
    }
  } else {
    max = self->bytes_in_buffer;
  }

  /* maximum number of bytes we are reading */
  len = max < bytes-1 ? max : bytes-1;

  /* if we read any data... */
  if (len > 0) {

    /* copy the data */
    memcpy(buf, self->buf_begin, len);
    buf[len] = 0;

    if (bound && len > 0 && buf[len-1] == '\r') {
      buf[--len] = 0;
    }

    /* update the buffer */
    self->bytes_in_buffer -= (int)len;
    self->buf_begin += len;
  }

  return len;
}

/*
  XXX: this is horrible memory-usage-wise, but we only expect
  to do this on small pieces of form data.
*/
static char *multipart_buffer_read_body(multipart_buffer *self, size_t *len)
{
  char buf[FILLUNIT], *out=NULL;
  size_t total_bytes=0, read_bytes=0;

  while((read_bytes = multipart_buffer_read(self, buf, sizeof(buf), NULL))) {
    out = erealloc(out, total_bytes + read_bytes + 1);
    memcpy(out + total_bytes, buf, read_bytes);
    total_bytes += read_bytes;
  }

  if (out) {
    out[total_bytes] = '\0';
  }
  *len = total_bytes;

  return out;
}
/* }}} */

/*
 * The combined READER/HANDLER
 *
 */

SAPI_API SAPI_POST_HANDLER_FUNC(rfc1867_post_handler) /* {{{ */
{
  char *boundary, *s = NULL, *boundary_end = NULL, *start_arr = NULL, *array_index = NULL;
  char *lbuf = NULL, *abuf = NULL;
  zend_string *temp_filename = NULL;
  int boundary_len = 0, cancel_upload = 0, is_arr_upload = 0;
  size_t array_len = 0;
  int64_t total_bytes = 0, max_file_size = 0;
  int skip_upload = 0, anonymous_index = 0;
  HashTable *uploaded_files = NULL;
  multipart_buffer *mbuff;
  zval *array_ptr = (zval *) arg;
  int fd = -1;
  zend_llist header;
  void *event_extra_data = NULL;
  unsigned int llen = 0;
  int upload_cnt = INI_INT("max_file_uploads");
  const zend_encoding *internal_encoding = zend_multibyte_get_internal_encoding();
  php_rfc1867_getword_t getword;
  php_rfc1867_getword_conf_t getword_conf;
  php_rfc1867_basename_t _basename;
  zend_long count = 0;

  if (php_rfc1867_encoding_translation() && internal_encoding) {
    getword = php_rfc1867_getword;
    getword_conf = php_rfc1867_getword_conf;
    _basename = php_rfc1867_basename;
  } else {
    getword = php_ap_getword;
    getword_conf = php_ap_getword_conf;
    _basename = php_ap_basename;
  }

  if (SG(post_max_size) > 0 && SG(request_info).content_length > SG(post_max_size)) {
    sapi_module.sapi_error(E_WARNING, "POST Content-Length of " ZEND_LONG_FMT " bytes exceeds the limit of " ZEND_LONG_FMT " bytes", SG(request_info).content_length, SG(post_max_size));
    return;
  }

  /* Get the boundary */
  boundary = strstr(content_type_dup, "boundary");
  if (!boundary) {
    int content_type_len = (int)strlen(content_type_dup);
    char *content_type_lcase = estrndup(content_type_dup, content_type_len);

    zend_str_tolower(content_type_lcase, content_type_len);
    boundary = strstr(content_type_lcase, "boundary");
    if (boundary) {
      boundary = content_type_dup + (boundary - content_type_lcase);
    }
    efree(content_type_lcase);
  }

  if (!boundary || !(boundary = strchr(boundary, '='))) {
    sapi_module.sapi_error(E_WARNING, "Missing boundary in multipart/form-data POST data");
    return;
  }

  boundary++;
  boundary_len = (int)strlen(boundary);

  if (boundary[0] == '"') {
    boundary++;
    boundary_end = strchr(boundary, '"');
    if (!boundary_end) {
      sapi_module.sapi_error(E_WARNING, "Invalid boundary in multipart/form-data POST data");
      return;
    }
  } else {
    /* search for the end of the boundary */
    boundary_end = strpbrk(boundary, ",;");
  }
  if (boundary_end) {
    boundary_end[0] = '\0';
    boundary_len = boundary_end-boundary;
  }

  /* Initialize the buffer */
  if (!(mbuff = multipart_buffer_new(boundary, boundary_len))) {
    sapi_module.sapi_error(E_WARNING, "Unable to initialize the input buffer");
    return;
  }

  /* Initialize $_FILES[] */
  zend_hash_init(&PG(rfc1867_protected_variables), 8, NULL, NULL, 0);

  ALLOC_HASHTABLE(uploaded_files);
  zend_hash_init(uploaded_files, 8, NULL, free_filename, 0);
  SG(rfc1867_uploaded_files) = uploaded_files;

  if (Z_TYPE(PG(http_globals)[TRACK_VARS_FILES]) != IS_ARRAY) {
    /* php_auto_globals_create_files() might have already done that */
    array_init(&PG(http_globals)[TRACK_VARS_FILES]);
  }

  zend_llist_init(&header, sizeof(mime_header_entry), (llist_dtor_func_t) php_free_hdr_entry, 0);

  if (php_rfc1867_callback != NULL) {
    multipart_event_start event_start;

    event_start.content_length = SG(request_info).content_length;
    if (php_rfc1867_callback(MULTIPART_EVENT_START, &event_start, &event_extra_data) == FAILURE) {
      goto fileupload_done;
    }
  }

  while (!multipart_buffer_eof(mbuff))
  {
    char buff[FILLUNIT];
    char *cd = NULL, *param = NULL, *filename = NULL, *tmp = NULL;
    size_t blen = 0, wlen = 0;
    zend_off_t offset;

    zend_llist_clean(&header);

    if (!multipart_buffer_headers(mbuff, &header)) {
      goto fileupload_done;
    }

    if ((cd = php_mime_get_hdr_value(header, "Content-Disposition"))) {
      char *pair = NULL;
      int end = 0;

      while (isspace(*cd)) {
        ++cd;
      }

      while (*cd && (pair = getword(mbuff->input_encoding, &cd, ';')))
      {
        char *key = NULL, *word = pair;

        while (isspace(*cd)) {
          ++cd;
        }

        if (strchr(pair, '=')) {
          key = getword(mbuff->input_encoding, &pair, '=');

          if (!strcasecmp(key, "name")) {
            if (param) {
              efree(param);
            }
            param = getword_conf(mbuff->input_encoding, pair);
            if (mbuff->input_encoding && internal_encoding) {
              unsigned char *new_param;
              size_t new_param_len;
              if ((size_t)-1 != zend_multibyte_encoding_converter(&new_param, &new_param_len, (unsigned char *)param, strlen(param), internal_encoding, mbuff->input_encoding)) {
                efree(param);
                param = (char *)new_param;
              }
            }
          } else if (!strcasecmp(key, "filename")) {
            if (filename) {
              efree(filename);
            }
            filename = getword_conf(mbuff->input_encoding, pair);
            if (mbuff->input_encoding && internal_encoding) {
              unsigned char *new_filename;
              size_t new_filename_len;
              if ((size_t)-1 != zend_multibyte_encoding_converter(&new_filename, &new_filename_len, (unsigned char *)filename, strlen(filename), internal_encoding, mbuff->input_encoding)) {
                efree(filename);
                filename = (char *)new_filename;
              }
            }
          }
        }
        if (key) {
          efree(key);
        }
        efree(word);
      }

      /* Normal form variable, safe to read all data into memory */
      if (!filename && param) {
        size_t value_len;
        char *value = multipart_buffer_read_body(mbuff, &value_len);
        size_t new_val_len; /* Dummy variable */

        if (!value) {
          value = estrdup("");
          value_len = 0;
        }

        if (mbuff->input_encoding && internal_encoding) {
          unsigned char *new_value;
          size_t new_value_len;
          if ((size_t)-1 != zend_multibyte_encoding_converter(&new_value, &new_value_len, (unsigned char *)value, value_len, internal_encoding, mbuff->input_encoding)) {
            efree(value);
            value = (char *)new_value;
            value_len = new_value_len;
          }
        }

        if (++count <= PG(max_input_vars) && sapi_module.input_filter(PARSE_POST, param, &value, value_len, &new_val_len)) {
          if (php_rfc1867_callback != NULL) {
            multipart_event_formdata event_formdata;
            size_t newlength = new_val_len;

            event_formdata.post_bytes_processed = SG(read_post_bytes);
            event_formdata.name = param;
            event_formdata.value = &value;
            event_formdata.length = new_val_len;
            event_formdata.newlength = &newlength;
            if (php_rfc1867_callback(MULTIPART_EVENT_FORMDATA, &event_formdata, &event_extra_data) == FAILURE) {
              efree(param);
              efree(value);
              continue;
            }
            new_val_len = newlength;
          }
          safe_php_register_variable(param, value, new_val_len, array_ptr, 0);
        } else {
          if (count == PG(max_input_vars) + 1) {
            php_error_docref(NULL, E_WARNING, "Input variables exceeded " ZEND_LONG_FMT ". To increase the limit change max_input_vars in php.ini.", PG(max_input_vars));
          }

          if (php_rfc1867_callback != NULL) {
            multipart_event_formdata event_formdata;

            event_formdata.post_bytes_processed = SG(read_post_bytes);
            event_formdata.name = param;
            event_formdata.value = &value;
            event_formdata.length = value_len;
            event_formdata.newlength = NULL;
            php_rfc1867_callback(MULTIPART_EVENT_FORMDATA, &event_formdata, &event_extra_data);
          }
        }

        if (!strcasecmp(param, "MAX_FILE_SIZE")) {
          max_file_size = strtoll(value, NULL, 10);
        }

        efree(param);
        efree(value);
        continue;
      }

      /* If file_uploads=off, skip the file part */
      if (!PG(file_uploads)) {
        skip_upload = 1;
      } else if (upload_cnt <= 0) {
        skip_upload = 1;
        sapi_module.sapi_error(E_WARNING, "Maximum number of allowable file uploads has been exceeded");
      }

      /* Return with an error if the posted data is garbled */
      if (!param && !filename) {
        sapi_module.sapi_error(E_WARNING, "File Upload Mime headers garbled");
        goto fileupload_done;
      }

      if (!param) {
        param = emalloc(MAX_SIZE_ANONNAME);
        snprintf(param, MAX_SIZE_ANONNAME, "%u", anonymous_index++);
      }

      /* New Rule: never repair potential malicious user input */
      if (!skip_upload) {
        long c = 0;
        tmp = param;

        while (*tmp) {
          if (*tmp == '[') {
            c++;
          } else if (*tmp == ']') {
            c--;
            if (tmp[1] && tmp[1] != '[') {
              skip_upload = 1;
              break;
            }
          }
          if (c < 0) {
            skip_upload = 1;
            break;
          }
          tmp++;
        }
        /* Brackets should always be closed */
        if(c != 0) {
          skip_upload = 1;
        }
      }

      total_bytes = cancel_upload = 0;
      temp_filename = NULL;
      fd = -1;

      if (!skip_upload && php_rfc1867_callback != NULL) {
        multipart_event_file_start event_file_start;

        event_file_start.post_bytes_processed = SG(read_post_bytes);
        event_file_start.name = param;
        event_file_start.filename = &filename;
        if (php_rfc1867_callback(MULTIPART_EVENT_FILE_START, &event_file_start, &event_extra_data) == FAILURE) {
          temp_filename = NULL;
          efree(param);
          efree(filename);
          continue;
        }
      }

      if (skip_upload) {
        efree(param);
        efree(filename);
        continue;
      }

      if (filename[0] == '\0') {
#if DEBUG_FILE_UPLOAD
        sapi_module.sapi_error(E_NOTICE, "No file uploaded");
#endif
        cancel_upload = UPLOAD_ERROR_D;
      }

      offset = 0;
      end = 0;

      if (!cancel_upload) {
        /* only bother to open temp file if we have data */
        blen = multipart_buffer_read(mbuff, buff, sizeof(buff), &end);
#if DEBUG_FILE_UPLOAD
        if (blen > 0) {
#else
        /* in non-debug mode we have no problem with 0-length files */
        {
#endif
          fd = php_open_temporary_fd_ex(PG(upload_tmp_dir), "php", &temp_filename, PHP_TMP_FILE_OPEN_BASEDIR_CHECK_ON_FALLBACK);
          upload_cnt--;
          if (fd == -1) {
            sapi_module.sapi_error(E_WARNING, "File upload error - unable to create a temporary file");
            cancel_upload = UPLOAD_ERROR_E;
          }
        }
      }

      while (!cancel_upload && (blen > 0))
      {
        if (php_rfc1867_callback != NULL) {
          multipart_event_file_data event_file_data;

          event_file_data.post_bytes_processed = SG(read_post_bytes);
          event_file_data.offset = offset;
          event_file_data.data = buff;
          event_file_data.length = blen;
          event_file_data.newlength = &blen;
          if (php_rfc1867_callback(MULTIPART_EVENT_FILE_DATA, &event_file_data, &event_extra_data) == FAILURE) {
            cancel_upload = UPLOAD_ERROR_X;
            continue;
          }
        }

        if (PG(upload_max_filesize) > 0 && (zend_long)(total_bytes+blen) > PG(upload_max_filesize)) {
#if DEBUG_FILE_UPLOAD
          sapi_module.sapi_error(E_NOTICE, "upload_max_filesize of " ZEND_LONG_FMT " bytes exceeded - file [%s=%s] not saved", PG(upload_max_filesize), param, filename);
#endif
          cancel_upload = UPLOAD_ERROR_A;
        } else if (max_file_size && ((zend_long)(total_bytes+blen) > max_file_size)) {
#if DEBUG_FILE_UPLOAD
          sapi_module.sapi_error(E_NOTICE, "MAX_FILE_SIZE of %" PRId64 " bytes exceeded - file [%s=%s] not saved", max_file_size, param, filename);
#endif
          cancel_upload = UPLOAD_ERROR_B;
        } else if (blen > 0) {
#ifdef PHP_WIN32
          wlen = write(fd, buff, (unsigned int)blen);
#else
          wlen = write(fd, buff, blen);
#endif

          if (wlen == (size_t)-1) {
            /* write failed */
#if DEBUG_FILE_UPLOAD
            sapi_module.sapi_error(E_NOTICE, "write() failed - %s", strerror(errno));
#endif
            cancel_upload = UPLOAD_ERROR_F;
          } else if (wlen < blen) {
#if DEBUG_FILE_UPLOAD
            sapi_module.sapi_error(E_NOTICE, "Only %zd bytes were written, expected to write %zd", wlen, blen);
#endif
            cancel_upload = UPLOAD_ERROR_F;
          } else {
            total_bytes += wlen;
          }
          offset += wlen;
        }

        /* read data for next iteration */
        blen = multipart_buffer_read(mbuff, buff, sizeof(buff), &end);
      }

      if (fd != -1) { /* may not be initialized if file could not be created */
        close(fd);
      }

      if (!cancel_upload && !end) {
#if DEBUG_FILE_UPLOAD
        sapi_module.sapi_error(E_NOTICE, "Missing mime boundary at the end of the data for file %s", filename[0] != '\0' ? filename : "");
#endif
        cancel_upload = UPLOAD_ERROR_C;
      }
#if DEBUG_FILE_UPLOAD
      if (filename[0] != '\0' && total_bytes == 0 && !cancel_upload) {
        sapi_module.sapi_error(E_WARNING, "Uploaded file size 0 - file [%s=%s] not saved", param, filename);
        cancel_upload = 5;
      }
#endif
      if (php_rfc1867_callback != NULL) {
        multipart_event_file_end event_file_end;

        event_file_end.post_bytes_processed = SG(read_post_bytes);
        event_file_end.temp_filename = temp_filename ? ZSTR_VAL(temp_filename) : NULL;
        event_file_end.cancel_upload = cancel_upload;
        if (php_rfc1867_callback(MULTIPART_EVENT_FILE_END, &event_file_end, &event_extra_data) == FAILURE) {
          cancel_upload = UPLOAD_ERROR_X;
        }
      }

      if (cancel_upload) {
        if (temp_filename) {
          if (cancel_upload != UPLOAD_ERROR_E) { /* file creation failed */
            unlink(ZSTR_VAL(temp_filename));
          }
          zend_string_release_ex(temp_filename, 0);
        }
        temp_filename = NULL;
      } else {
        zend_hash_add_ptr(SG(rfc1867_uploaded_files), temp_filename, temp_filename);
      }

      /* is_arr_upload is true when name of file upload field
       * ends in [.*]
       * start_arr is set to point to 1st [ */
      is_arr_upload = (start_arr = strchr(param,'[')) && (param[strlen(param)-1] == ']');

      if (is_arr_upload) {
        array_len = strlen(start_arr);
        if (array_index) {
          efree(array_index);
        }
        array_index = estrndup(start_arr + 1, array_len - 2);
      }

      /* Add $foo_name */
      if (llen < strlen(param) + MAX_SIZE_OF_INDEX + 1) {
        llen = (int)strlen(param);
        lbuf = (char *) safe_erealloc(lbuf, llen, 1, MAX_SIZE_OF_INDEX + 1);
        llen += MAX_SIZE_OF_INDEX + 1;
      }

      if (is_arr_upload) {
        if (abuf) efree(abuf);
        abuf = estrndup(param, strlen(param)-array_len);
        snprintf(lbuf, llen, "%s_name[%s]", abuf, array_index);
      } else {
        snprintf(lbuf, llen, "%s_name", param);
      }

      /* Pursuant to RFC 7578, strip any path components in the
       * user-supplied file name:
       *  > If a "filename" parameter is supplied ... do not use
       *  > directory path information that may be present."
       */
      s = _basename(internal_encoding, filename);
      if (!s) {
        s = filename;
      }

      /* Add $foo[name] */
      if (is_arr_upload) {
        snprintf(lbuf, llen, "%s[name][%s]", abuf, array_index);
      } else {
        snprintf(lbuf, llen, "%s[name]", param);
      }
      register_http_post_files_variable(lbuf, s, &PG(http_globals)[TRACK_VARS_FILES], 0);
      s = NULL;

      /* Add full path of supplied file for folder uploads via 
       * <input type="file" name="files" multiple webkitdirectory>
       */
      /* Add $foo[full_path] */
      if (is_arr_upload) {
        snprintf(lbuf, llen, "%s[full_path][%s]", abuf, array_index);
      } else {
        snprintf(lbuf, llen, "%s[full_path]", param);
      }
      register_http_post_files_variable(lbuf, filename, &PG(http_globals)[TRACK_VARS_FILES], 0);
      efree(filename);

      /* Possible Content-Type: */
      if (cancel_upload || !(cd = php_mime_get_hdr_value(header, "Content-Type"))) {
        cd = "";
      } else {
        /* fix for Opera 6.01 */
        s = strchr(cd, ';');
        if (s != NULL) {
          *s = '\0';
        }
      }

      /* Add $foo[type] */
      if (is_arr_upload) {
        snprintf(lbuf, llen, "%s[type][%s]", abuf, array_index);
      } else {
        snprintf(lbuf, llen, "%s[type]", param);
      }
      register_http_post_files_variable(lbuf, cd, &PG(http_globals)[TRACK_VARS_FILES], 0);

      /* Restore Content-Type Header */
      if (s != NULL) {
        *s = ';';
      }
      s = "";

      {
        /* store temp_filename as-is (in case upload_tmp_dir
         * contains escapable characters. escape only the variable name.) */
        zval zfilename;

        /* Initialize variables */
        add_protected_variable(param);

        /* Add $foo[tmp_name] */
        if (is_arr_upload) {
          snprintf(lbuf, llen, "%s[tmp_name][%s]", abuf, array_index);
        } else {
          snprintf(lbuf, llen, "%s[tmp_name]", param);
        }
        add_protected_variable(lbuf);
        if (temp_filename) {
          ZVAL_STR_COPY(&zfilename, temp_filename);
        } else {
          ZVAL_EMPTY_STRING(&zfilename);
        }
        register_http_post_files_variable_ex(lbuf, &zfilename, &PG(http_globals)[TRACK_VARS_FILES], 1);
      }

      {
        zval file_size, error_type;
        int size_overflow = 0;
        char file_size_buf[65];

        ZVAL_LONG(&error_type, cancel_upload);

        /* Add $foo[error] */
        if (cancel_upload) {
          ZVAL_LONG(&file_size, 0);
        } else {
          if (total_bytes > ZEND_LONG_MAX) {
#ifdef PHP_WIN32
            if (_i64toa_s(total_bytes, file_size_buf, 65, 10)) {
              file_size_buf[0] = '0';
              file_size_buf[1] = '\0';
            }
#else
            {
              int __len = snprintf(file_size_buf, 65, "%" PRId64, total_bytes);
              file_size_buf[__len] = '\0';
            }
#endif
            size_overflow = 1;

          } else {
            ZVAL_LONG(&file_size, total_bytes);
          }
        }

        if (is_arr_upload) {
          snprintf(lbuf, llen, "%s[error][%s]", abuf, array_index);
        } else {
          snprintf(lbuf, llen, "%s[error]", param);
        }
        register_http_post_files_variable_ex(lbuf, &error_type, &PG(http_globals)[TRACK_VARS_FILES], 0);

        /* Add $foo[size] */
        if (is_arr_upload) {
          snprintf(lbuf, llen, "%s[size][%s]", abuf, array_index);
        } else {
          snprintf(lbuf, llen, "%s[size]", param);
        }
        if (size_overflow) {
          ZVAL_STRING(&file_size, file_size_buf);
        }
        register_http_post_files_variable_ex(lbuf, &file_size, &PG(http_globals)[TRACK_VARS_FILES], size_overflow);
      }
      efree(param);
    }
  }

fileupload_done:
  if (php_rfc1867_callback != NULL) {
    multipart_event_end event_end;

    event_end.post_bytes_processed = SG(read_post_bytes);
    php_rfc1867_callback(MULTIPART_EVENT_END, &event_end, &event_extra_data);
  }

  if (lbuf) efree(lbuf);
  if (abuf) efree(abuf);
  if (array_index) efree(array_index);
  zend_hash_destroy(&PG(rfc1867_protected_variables));
  zend_llist_destroy(&header);
  if (mbuff->boundary_next) efree(mbuff->boundary_next);
  if (mbuff->boundary) efree(mbuff->boundary);
  if (mbuff->buffer) efree(mbuff->buffer);
  if (mbuff) efree(mbuff);
}
/* }}} */

SAPI_API void php_rfc1867_set_multibyte_callbacks(
          php_rfc1867_encoding_translation_t encoding_translation,
          php_rfc1867_get_detect_order_t get_detect_order,
          php_rfc1867_set_input_encoding_t set_input_encoding,
          php_rfc1867_getword_t getword,
          php_rfc1867_getword_conf_t getword_conf,
          php_rfc1867_basename_t basename) /* {{{ */
{
  php_rfc1867_encoding_translation = encoding_translation;
  php_rfc1867_get_detect_order = get_detect_order;
  php_rfc1867_set_input_encoding = set_input_encoding;
  php_rfc1867_getword = getword;
  php_rfc1867_getword_conf = getword_conf;
  php_rfc1867_basename = basename;
}
/* }}} */

Coverage Report

Created: 2023-12-13 20:07