+++ /dev/null
-/*
- some simple CGI helper routines
- Copyright (C) Andrew Tridgell 1997-1998
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#include "includes.h"
-#include "system/passwd.h"
-#include "system/filesys.h"
-#include "web/swat_proto.h"
-#include "intl/lang_tdb.h"
-#include "auth.h"
-#include "secrets.h"
-#include "../lib/util/setid.h"
-
-#define MAX_VARIABLES 10000
-
-/* set the expiry on fixed pages */
-#define EXPIRY_TIME (60*60*24*7)
-
-#ifdef DEBUG_COMMENTS
-extern void print_title(char *fmt, ...);
-#endif
-
-struct cgi_var {
- char *name;
- char *value;
-};
-
-static struct cgi_var variables[MAX_VARIABLES];
-static int num_variables;
-static int content_length;
-static int request_post;
-static char *query_string;
-static const char *baseurl;
-static char *pathinfo;
-static char *C_user;
-static char *C_pass;
-static bool inetd_server;
-static bool got_request;
-
-static char *grab_line(FILE *f, int *cl)
-{
- char *ret = NULL;
- int i = 0;
- int len = 0;
-
- while ((*cl)) {
- int c;
-
- if (i == len) {
- char *ret2;
- if (len == 0) len = 1024;
- else len *= 2;
- ret2 = (char *)SMB_REALLOC_KEEP_OLD_ON_ERROR(ret, len);
- if (!ret2) return ret;
- ret = ret2;
- }
-
- c = fgetc(f);
- (*cl)--;
-
- if (c == EOF) {
- (*cl) = 0;
- break;
- }
-
- if (c == '\r') continue;
-
- if (strchr_m("\n&", c)) break;
-
- ret[i++] = c;
-
- }
-
- if (ret) {
- ret[i] = 0;
- }
- return ret;
-}
-
-/**
- URL encoded strings can have a '+', which should be replaced with a space
-
- (This was in rfc1738_unescape(), but that broke the squid helper)
-**/
-
-static void plus_to_space_unescape(char *buf)
-{
- char *p=buf;
-
- while ((p=strchr_m(p,'+')))
- *p = ' ';
-}
-
-/***************************************************************************
- load all the variables passed to the CGI program. May have multiple variables
- with the same name and the same or different values. Takes a file parameter
- for simulating CGI invocation eg loading saved preferences.
- ***************************************************************************/
-void cgi_load_variables(void)
-{
- static char *line;
- char *p, *s, *tok;
- int len, i;
- FILE *f = stdin;
-
-#ifdef DEBUG_COMMENTS
- char dummy[100]="";
- print_title(dummy);
- printf("<!== Start dump in cgi_load_variables() %s ==>\n",__FILE__);
-#endif
-
- if (!content_length) {
- p = getenv("CONTENT_LENGTH");
- len = p?atoi(p):0;
- } else {
- len = content_length;
- }
-
-
- if (len > 0 &&
- (request_post ||
- ((s=getenv("REQUEST_METHOD")) &&
- strequal(s,"POST")))) {
- while (len && (line=grab_line(f, &len))) {
- p = strchr_m(line,'=');
- if (!p) continue;
-
- *p = 0;
-
- variables[num_variables].name = SMB_STRDUP(line);
- variables[num_variables].value = SMB_STRDUP(p+1);
-
- SAFE_FREE(line);
-
- if (!variables[num_variables].name ||
- !variables[num_variables].value)
- continue;
-
- plus_to_space_unescape(variables[num_variables].value);
- rfc1738_unescape(variables[num_variables].value);
- plus_to_space_unescape(variables[num_variables].name);
- rfc1738_unescape(variables[num_variables].name);
-
-#ifdef DEBUG_COMMENTS
- printf("<!== POST var %s has value \"%s\" ==>\n",
- variables[num_variables].name,
- variables[num_variables].value);
-#endif
-
- num_variables++;
- if (num_variables == MAX_VARIABLES) break;
- }
- }
-
- fclose(stdin);
- open("/dev/null", O_RDWR);
-
- if ((s=query_string) || (s=getenv("QUERY_STRING"))) {
- char *saveptr;
- for (tok=strtok_r(s, "&;", &saveptr); tok;
- tok=strtok_r(NULL, "&;", &saveptr)) {
- p = strchr_m(tok,'=');
- if (!p) continue;
-
- *p = 0;
-
- variables[num_variables].name = SMB_STRDUP(tok);
- variables[num_variables].value = SMB_STRDUP(p+1);
-
- if (!variables[num_variables].name ||
- !variables[num_variables].value)
- continue;
-
- plus_to_space_unescape(variables[num_variables].value);
- rfc1738_unescape(variables[num_variables].value);
- plus_to_space_unescape(variables[num_variables].name);
- rfc1738_unescape(variables[num_variables].name);
-
-#ifdef DEBUG_COMMENTS
- printf("<!== Commandline var %s has value \"%s\" ==>\n",
- variables[num_variables].name,
- variables[num_variables].value);
-#endif
- num_variables++;
- if (num_variables == MAX_VARIABLES) break;
- }
-
- }
-#ifdef DEBUG_COMMENTS
- printf("<!== End dump in cgi_load_variables() ==>\n");
-#endif
-
- /* variables from the client are in UTF-8 - convert them
- to our internal unix charset before use */
- for (i=0;i<num_variables;i++) {
- TALLOC_CTX *frame = talloc_stackframe();
- char *dest = NULL;
- size_t dest_len;
-
- convert_string_talloc(frame, CH_UTF8, CH_UNIX,
- variables[i].name, strlen(variables[i].name),
- &dest, &dest_len);
- SAFE_FREE(variables[i].name);
- variables[i].name = SMB_STRDUP(dest ? dest : "");
-
- dest = NULL;
- convert_string_talloc(frame, CH_UTF8, CH_UNIX,
- variables[i].value, strlen(variables[i].value),
- &dest, &dest_len);
- SAFE_FREE(variables[i].value);
- variables[i].value = SMB_STRDUP(dest ? dest : "");
- TALLOC_FREE(frame);
- }
-}
-
-
-/***************************************************************************
- find a variable passed via CGI
- Doesn't quite do what you think in the case of POST text variables, because
- if they exist they might have a value of "" or even " ", depending on the
- browser. Also doesn't allow for variables[] containing multiple variables
- with the same name and the same or different values.
- ***************************************************************************/
-
-const char *cgi_variable(const char *name)
-{
- int i;
-
- for (i=0;i<num_variables;i++)
- if (strcmp(variables[i].name, name) == 0)
- return variables[i].value;
- return NULL;
-}
-
-/***************************************************************************
- Version of the above that can't return a NULL pointer.
-***************************************************************************/
-
-const char *cgi_variable_nonull(const char *name)
-{
- const char *var = cgi_variable(name);
- if (var) {
- return var;
- } else {
- return "";
- }
-}
-
-/***************************************************************************
-tell a browser about a fatal error in the http processing
- ***************************************************************************/
-static void cgi_setup_error(const char *err, const char *header, const char *info)
-{
- if (!got_request) {
- /* damn browsers don't like getting cut off before they give a request */
- char line[1024];
- while (fgets(line, sizeof(line)-1, stdin)) {
- if (strnequal(line,"GET ", 4) ||
- strnequal(line,"POST ", 5) ||
- strnequal(line,"PUT ", 4)) {
- break;
- }
- }
- }
-
- printf("HTTP/1.0 %s\r\n%sConnection: close\r\nContent-Type: text/html\r\n\r\n<HTML><HEAD><TITLE>%s</TITLE></HEAD><BODY><H1>%s</H1>%s<p></BODY></HTML>\r\n\r\n", err, header, err, err, info);
- fclose(stdin);
- fclose(stdout);
- exit(0);
-}
-
-
-/***************************************************************************
-tell a browser about a fatal authentication error
- ***************************************************************************/
-static void cgi_auth_error(void)
-{
- if (inetd_server) {
- cgi_setup_error("401 Authorization Required",
- "WWW-Authenticate: Basic realm=\"SWAT\"\r\n",
- "You must be authenticated to use this service");
- } else {
- printf("Content-Type: text/html\r\n");
-
- printf("\r\n<HTML><HEAD><TITLE>SWAT</TITLE></HEAD>\n");
- printf("<BODY><H1>Installation Error</H1>\n");
- printf("SWAT must be installed via inetd. It cannot be run as a CGI script<p>\n");
- printf("</BODY></HTML>\r\n");
- }
- exit(0);
-}
-
-/***************************************************************************
-authenticate when we are running as a CGI
- ***************************************************************************/
-static void cgi_web_auth(void)
-{
- const char *user = getenv("REMOTE_USER");
- struct passwd *pwd;
- const char *head = "Content-Type: text/html\r\n\r\n<HTML><BODY><H1>SWAT installation Error</H1>\n";
- const char *tail = "</BODY></HTML>\r\n";
-
- if (!user) {
- printf("%sREMOTE_USER not set. Not authenticated by web server.<br>%s\n",
- head, tail);
- exit(0);
- }
-
- pwd = Get_Pwnam_alloc(talloc_tos(), user);
- if (!pwd) {
- printf("%sCannot find user %s<br>%s\n", head, user, tail);
- exit(0);
- }
-
- C_user = SMB_STRDUP(user);
-
- if (!samba_setuid(0)) {
- C_pass = secrets_fetch_generic("root", "SWAT");
- if (C_pass == NULL) {
- char *tmp_pass = NULL;
- tmp_pass = generate_random_password(talloc_tos(),
- 16, 16);
- if (tmp_pass == NULL) {
- printf("%sFailed to create random nonce for "
- "SWAT session\n<br>%s\n", head, tail);
- exit(0);
- }
- secrets_store_generic("root", "SWAT", tmp_pass);
- C_pass = SMB_STRDUP(tmp_pass);
- TALLOC_FREE(tmp_pass);
- }
- }
- samba_setuid(pwd->pw_uid);
- if (geteuid() != pwd->pw_uid || getuid() != pwd->pw_uid) {
- printf("%sFailed to become user %s - uid=%d/%d<br>%s\n",
- head, user, (int)geteuid(), (int)getuid(), tail);
- exit(0);
- }
- TALLOC_FREE(pwd);
-}
-
-
-/***************************************************************************
-handle a http authentication line
- ***************************************************************************/
-static bool cgi_handle_authorization(char *line)
-{
- char *p;
- fstring user, user_pass;
- struct passwd *pass = NULL;
- const char *rhost;
- char addr[INET6_ADDRSTRLEN];
- size_t size = 0;
-
- if (!strnequal(line,"Basic ", 6)) {
- goto err;
- }
- line += 6;
- while (line[0] == ' ') line++;
- base64_decode_inplace(line);
- if (!(p=strchr_m(line,':'))) {
- /*
- * Always give the same error so a cracker
- * cannot tell why we fail.
- */
- goto err;
- }
- *p = 0;
-
- if (!convert_string(CH_UTF8, CH_UNIX,
- line, -1,
- user, sizeof(user), &size)) {
- goto err;
- }
-
- if (!convert_string(CH_UTF8, CH_UNIX,
- p+1, -1,
- user_pass, sizeof(user_pass), &size)) {
- goto err;
- }
-
- /*
- * Try and get the user from the UNIX password file.
- */
-
- pass = Get_Pwnam_alloc(talloc_tos(), user);
-
- rhost = client_name(1);
- if (strequal(rhost,"UNKNOWN"))
- rhost = client_addr(1, addr, sizeof(addr));
-
- /*
- * Validate the password they have given.
- */
-
- if NT_STATUS_IS_OK(pass_check(pass, user, rhost, user_pass, false)) {
- if (pass) {
- /*
- * Password was ok.
- */
-
- if ( initgroups(pass->pw_name, pass->pw_gid) != 0 )
- goto err;
-
- become_user_permanently(pass->pw_uid, pass->pw_gid);
-
- /* Save the users name */
- C_user = SMB_STRDUP(user);
- C_pass = SMB_STRDUP(user_pass);
- TALLOC_FREE(pass);
- return True;
- }
- }
-
-err:
- cgi_setup_error("401 Bad Authorization",
- "WWW-Authenticate: Basic realm=\"SWAT\"\r\n",
- "username or password incorrect");
-
- TALLOC_FREE(pass);
- return False;
-}
-
-/***************************************************************************
-is this root?
- ***************************************************************************/
-bool am_root(void)
-{
- if (geteuid() == 0) {
- return( True);
- } else {
- return( False);
- }
-}
-
-/***************************************************************************
-return a ptr to the users name
- ***************************************************************************/
-char *cgi_user_name(void)
-{
- return(C_user);
-}
-
-/***************************************************************************
-return a ptr to the users password
- ***************************************************************************/
-char *cgi_user_pass(void)
-{
- return(C_pass);
-}
-
-/***************************************************************************
-handle a file download
- ***************************************************************************/
-static void cgi_download(char *file)
-{
- SMB_STRUCT_STAT st;
- char buf[1024];
- int fd, l, i;
- char *p;
- char *lang;
-
- /* sanitise the filename */
- for (i=0;file[i];i++) {
- if (!isalnum((int)file[i]) && !strchr_m("/.-_", file[i])) {
- cgi_setup_error("404 File Not Found","",
- "Illegal character in filename");
- }
- }
-
- if (sys_stat(file, &st, false) != 0) {
- cgi_setup_error("404 File Not Found","",
- "The requested file was not found");
- }
-
- if (S_ISDIR(st.st_ex_mode))
- {
- snprintf(buf, sizeof(buf), "%s/index.html", file);
- if (!file_exist_stat(buf, &st, false)
- || !S_ISREG(st.st_ex_mode))
- {
- cgi_setup_error("404 File Not Found","",
- "The requested file was not found");
- }
- }
- else if (S_ISREG(st.st_ex_mode))
- {
- snprintf(buf, sizeof(buf), "%s", file);
- }
- else
- {
- cgi_setup_error("404 File Not Found","",
- "The requested file was not found");
- }
-
- fd = web_open(buf,O_RDONLY,0);
- if (fd == -1) {
- cgi_setup_error("404 File Not Found","",
- "The requested file was not found");
- }
- printf("HTTP/1.0 200 OK\r\n");
- if ((p=strrchr_m(buf, '.'))) {
- if (strcmp(p,".gif")==0) {
- printf("Content-Type: image/gif\r\n");
- } else if (strcmp(p,".jpg")==0) {
- printf("Content-Type: image/jpeg\r\n");
- } else if (strcmp(p,".png")==0) {
- printf("Content-Type: image/png\r\n");
- } else if (strcmp(p,".css")==0) {
- printf("Content-Type: text/css\r\n");
- } else if (strcmp(p,".txt")==0) {
- printf("Content-Type: text/plain\r\n");
- } else {
- printf("Content-Type: text/html\r\n");
- }
- }
- printf("Expires: %s\r\n",
- http_timestring(talloc_tos(), time(NULL)+EXPIRY_TIME));
-
- lang = lang_tdb_current();
- if (lang) {
- printf("Content-Language: %s\r\n", lang);
- }
-
- printf("Content-Length: %d\r\n\r\n", (int)st.st_ex_size);
- while ((l=read(fd,buf,sizeof(buf)))>0) {
- if (fwrite(buf, 1, l, stdout) != l) {
- break;
- }
- }
- close(fd);
- exit(0);
-}
-
-
-
-/* return true if the char* contains ip addrs only. Used to avoid
-name lookup calls */
-
-static bool only_ipaddrs_in_list(const char **list)
-{
- bool only_ip = true;
-
- if (!list) {
- return true;
- }
-
- for (; *list ; list++) {
- /* factor out the special strings */
- if (strequal(*list, "ALL") || strequal(*list, "FAIL") ||
- strequal(*list, "EXCEPT")) {
- continue;
- }
-
- if (!is_ipaddress(*list)) {
- /*
- * If we failed, make sure that it was not because
- * the token was a network/netmask pair. Only
- * network/netmask pairs have a '/' in them.
- */
- if ((strchr_m(*list, '/')) == NULL) {
- only_ip = false;
- DEBUG(3,("only_ipaddrs_in_list: list has "
- "non-ip address (%s)\n",
- *list));
- break;
- }
- }
- }
-
- return only_ip;
-}
-
-/* return true if access should be allowed to a service for a socket */
-static bool check_access(int sock, const char **allow_list,
- const char **deny_list)
-{
- bool ret = false;
- bool only_ip = false;
- char addr[INET6_ADDRSTRLEN];
-
- if ((!deny_list || *deny_list==0) && (!allow_list || *allow_list==0)) {
- return true;
- }
-
- /* Bypass name resolution calls if the lists
- * only contain IP addrs */
- if (only_ipaddrs_in_list(allow_list) &&
- only_ipaddrs_in_list(deny_list)) {
- only_ip = true;
- DEBUG (3, ("check_access: no hostnames "
- "in host allow/deny list.\n"));
- ret = allow_access(deny_list,
- allow_list,
- "",
- get_peer_addr(sock,addr,sizeof(addr)));
- } else {
- DEBUG (3, ("check_access: hostnames in "
- "host allow/deny list.\n"));
- ret = allow_access(deny_list,
- allow_list,
- get_peer_name(sock,true),
- get_peer_addr(sock,addr,sizeof(addr)));
- }
-
- if (ret) {
- DEBUG(2,("Allowed connection from %s (%s)\n",
- only_ip ? "" : get_peer_name(sock,true),
- get_peer_addr(sock,addr,sizeof(addr))));
- } else {
- DEBUG(0,("Denied connection from %s (%s)\n",
- only_ip ? "" : get_peer_name(sock,true),
- get_peer_addr(sock,addr,sizeof(addr))));
- }
-
- return(ret);
-}
-
-/**
- * @brief Setup the CGI framework.
- *
- * Setup the cgi framework, handling the possibility that this program
- * is either run as a true CGI program with a gateway to a web server, or
- * is itself a mini web server.
- **/
-void cgi_setup(const char *rootdir, int auth_required)
-{
- bool authenticated = False;
- char line[1024];
- char *url=NULL;
- char *p;
- char *lang;
-
- if (chdir(rootdir)) {
- cgi_setup_error("500 Server Error", "",
- "chdir failed - the server is not configured correctly");
- }
-
- /* Handle the possibility we might be running as non-root */
- sec_init();
-
- if ((lang=getenv("HTTP_ACCEPT_LANGUAGE"))) {
- /* if running as a cgi program */
- web_set_lang(lang);
- }
-
- /* maybe we are running under a web server */
- if (getenv("CONTENT_LENGTH") || getenv("REQUEST_METHOD")) {
- if (auth_required) {
- cgi_web_auth();
- }
- return;
- }
-
- inetd_server = True;
-
- if (!check_access(1, lp_hostsallow(-1), lp_hostsdeny(-1))) {
- cgi_setup_error("403 Forbidden", "",
- "Samba is configured to deny access from this client\n<br>Check your \"hosts allow\" and \"hosts deny\" options in smb.conf ");
- }
-
- /* we are a mini-web server. We need to read the request from stdin
- and handle authentication etc */
- while (fgets(line, sizeof(line)-1, stdin)) {
- if (line[0] == '\r' || line[0] == '\n') break;
- if (strnequal(line,"GET ", 4)) {
- got_request = True;
- url = SMB_STRDUP(&line[4]);
- } else if (strnequal(line,"POST ", 5)) {
- got_request = True;
- request_post = 1;
- url = SMB_STRDUP(&line[5]);
- } else if (strnequal(line,"PUT ", 4)) {
- got_request = True;
- cgi_setup_error("400 Bad Request", "",
- "This server does not accept PUT requests");
- } else if (strnequal(line,"Authorization: ", 15)) {
- authenticated = cgi_handle_authorization(&line[15]);
- } else if (strnequal(line,"Content-Length: ", 16)) {
- content_length = atoi(&line[16]);
- } else if (strnequal(line,"Accept-Language: ", 17)) {
- web_set_lang(&line[17]);
- }
- /* ignore all other requests! */
- }
-
- if (auth_required && !authenticated) {
- cgi_auth_error();
- }
-
- if (!url) {
- cgi_setup_error("400 Bad Request", "",
- "You must specify a GET or POST request");
- }
-
- /* trim the URL */
- if ((p = strchr_m(url,' ')) || (p=strchr_m(url,'\t'))) {
- *p = 0;
- }
- while (*url && strchr_m("\r\n",url[strlen(url)-1])) {
- url[strlen(url)-1] = 0;
- }
-
- /* anything following a ? in the URL is part of the query string */
- if ((p=strchr_m(url,'?'))) {
- query_string = p+1;
- *p = 0;
- }
-
- string_sub(url, "/swat/", "", 0);
-
- if (url[0] != '/' && strstr(url,"..")==0) {
- cgi_download(url);
- }
-
- printf("HTTP/1.0 200 OK\r\nConnection: close\r\n");
- printf("Date: %s\r\n", http_timestring(talloc_tos(), time(NULL)));
- baseurl = "";
- pathinfo = url+1;
-}
-
-
-/***************************************************************************
-return the current pages URL
- ***************************************************************************/
-const char *cgi_baseurl(void)
-{
- if (inetd_server) {
- return baseurl;
- }
- return getenv("SCRIPT_NAME");
-}
-
-/***************************************************************************
-return the current pages path info
- ***************************************************************************/
-const char *cgi_pathinfo(void)
-{
- char *r;
- if (inetd_server) {
- return pathinfo;
- }
- r = getenv("PATH_INFO");
- if (!r) return "";
- if (*r == '/') r++;
- return r;
-}
-
-/***************************************************************************
-return the hostname of the client
- ***************************************************************************/
-const char *cgi_remote_host(void)
-{
- if (inetd_server) {
- return get_peer_name(1,False);
- }
- return getenv("REMOTE_HOST");
-}
-
-/***************************************************************************
-return the hostname of the client
- ***************************************************************************/
-const char *cgi_remote_addr(void)
-{
- if (inetd_server) {
- char addr[INET6_ADDRSTRLEN];
- get_peer_addr(1,addr,sizeof(addr));
- return talloc_strdup(talloc_tos(), addr);
- }
- return getenv("REMOTE_ADDR");
-}
-
-
-/***************************************************************************
-return True if the request was a POST
- ***************************************************************************/
-bool cgi_waspost(void)
-{
- if (inetd_server) {
- return request_post;
- }
- return strequal(getenv("REQUEST_METHOD"), "POST");
-}
git.samba.org / samba.git / blobdiff