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-rw-r--r--source3/include/proto.h1
-rw-r--r--source3/web/cgi.c70
-rw-r--r--source3/web/swat.c116
3 files changed, 108 insertions, 79 deletions
diff --git a/source3/include/proto.h b/source3/include/proto.h
index 5c0efaf93c..24d4040c3c 100644
--- a/source3/include/proto.h
+++ b/source3/include/proto.h
@@ -2657,4 +2657,5 @@ void status_page(void);
/*The following definitions come from web/swat.c */
+BOOL become_user_permanently(uid_t uid, gid_t gid);
#endif /* _PROTO_H_ */
diff --git a/source3/web/cgi.c b/source3/web/cgi.c
index 5415abf6b3..9b5cf2158c 100644
--- a/source3/web/cgi.c
+++ b/source3/web/cgi.c
@@ -293,29 +293,83 @@ static void base64_decode(char *s)
/***************************************************************************
handle a http authentication line
***************************************************************************/
-static int cgi_handle_authorization(char *line)
+static BOOL cgi_handle_authorization(char *line)
{
- char *p, *user, *pass;
+ char *p, *user, *user_pass;
+ struct passwd *pass = NULL;
+ int ret = False;
if (strncasecmp(line,"Basic ", 6)) {
cgi_setup_error("401 Bad Authorization", "",
"Only basic authorization is understood");
+ return False;
}
line += 6;
while (line[0] == ' ') line++;
base64_decode(line);
if (!(p=strchr(line,':'))) {
+ /*
+ * Always give the same error so a cracker
+ * cannot tell why we fail.
+ */
cgi_setup_error("401 Bad Authorization", "",
"username/password must be supplied");
+ return False;
}
*p = 0;
user = line;
- pass = p+1;
+ user_pass = p+1;
+
+ /*
+ * Try and get the user from the UNIX password file.
+ */
+
+ if(!(pass = Get_Pwnam(user,False))) {
+ /*
+ * Always give the same error so a cracker
+ * cannot tell why we fail.
+ */
+ cgi_setup_error("401 Bad Authorization", "",
+ "username/password must be supplied");
+ return False;
+ }
+
+ /*
+ * Validate the password they have given.
+ */
+
+ if((ret = pass_check(user, user_pass, strlen(user_pass), NULL, NULL)) == True) {
+
+ /*
+ * Password was ok.
+ */
+
+ if(pass->pw_uid != 0) {
+ /*
+ * We have not authenticated as root,
+ * become the user *permanently*.
+ */
+ if(!become_user_permanently(pass->pw_uid, pass->pw_gid)) {
+ /*
+ * Always give the same error so a cracker
+ * cannot tell why we fail.
+ */
+ cgi_setup_error("401 Bad Authorization", "",
+ "username/password must be supplied");
+ return False;
+ }
+
+ /*
+ * On exit from here we are the authenticated
+ * user - no way back.
+ */
+ }
- /* Save the users name */
- C_user = strdup(user);
+ /* Save the users name */
+ C_user = strdup(user);
+ }
- return pass_check(user, pass, strlen(pass), NULL, NULL);
+ return ret;
}
/***************************************************************************
@@ -323,7 +377,7 @@ is this root?
***************************************************************************/
BOOL am_root(void)
{
- if ((C_user) && (strcmp(C_user,"root") == 0)) {
+ if (geteuid() == 0) {
return( True);
} else {
return( False);
@@ -393,7 +447,7 @@ run as a true cgi program by a web browser or is itself a mini web server
***************************************************************************/
void cgi_setup(char *rootdir, int auth_required)
{
- int authenticated = 0;
+ BOOL authenticated = False;
char line[1024];
char *url=NULL;
char *p;
diff --git a/source3/web/swat.c b/source3/web/swat.c
index 1030689f18..1ab90a3a3d 100644
--- a/source3/web/swat.c
+++ b/source3/web/swat.c
@@ -771,74 +771,62 @@ static BOOL talk_to_smbpasswd(char *old, char *new)
}
/****************************************************************************
- become the specified uid
+ become the specified uid - permanently !
****************************************************************************/
-static BOOL become_uid(uid_t uid)
+
+BOOL become_user_permanently(uid_t uid, gid_t gid)
{
-#ifdef HAVE_TRAPDOOR_UID
-#ifdef HAVE_SETUIDX
- /* AIX3 has setuidx which is NOT a trapoor function (tridge) */
- if (setuidx(ID_EFFECTIVE, uid) != 0) {
- if (seteuid(uid) != 0) {
- printf("<p> Can't set uid %d (setuidx)\n", (int)uid);
- return False;
- }
- }
-#endif
-#endif
-#ifdef HAVE_SETRESUID
- if (setresuid(-1,uid,-1) != 0)
-#else
- if ((seteuid(uid) != 0) && (setuid(uid) != 0))
-#endif
- {
- printf("<p> Couldn't set uid %d currently set to (uid %d, euid %d)\n",
- (int)uid,(int)getuid(), (int)geteuid());
- if (uid > (uid_t)32000) {
- printf("<p> Looks like your OS doesn't like high uid values - try using a different account\n");
+ if (geteuid() != 0) {
+ return(True);
+ }
- }
- return(False);
- }
+ /* now completely lose our privilages. This is a fairly paranoid
+ way of doing it, but it does work on all systems that I know of */
- if (((uid == (uid_t)-1) || ((sizeof(uid_t) == 2) && (uid == 65535))) &&
- (geteuid() != uid)) {
- printf("<p> Invalid uid -1. perhaps you have a account with uid 65535?\n");
- return(False);
- }
+#ifdef HAVE_SETRESUID
+ /*
+ * Firstly ensure all our uids are set to root.
+ */
+ setresgid(0,0,0);
+ setresuid(0,0,0);
- return(True);
-}
+ /*
+ * Now ensure we change all our gids.
+ */
+ setresgid(gid,gid,gid);
-/****************************************************************************
- become the specified gid
-****************************************************************************/
-static BOOL become_gid(gid_t gid)
-{
-#ifdef HAVE_SETRESUID
- if (setresgid(-1,gid,-1) != 0)
+ /*
+ * Now ensure all the uids are the user.
+ */
+ setresuid(uid,uid,uid);
#else
- if (setgid(gid) != 0)
+ /*
+ * Firstly ensure all our uids are set to root.
+ */
+ setuid(0);
+ seteuid(0);
+
+ /*
+ * Now ensure we change all our gids.
+ */
+ setgid(gid);
+ setegid(gid);
+
+ /*
+ * Now ensure all the uids are the user.
+ */
+ setuid(uid);
+ seteuid(uid);
#endif
- {
- printf("<p> Couldn't set gid %d currently set to (gid %d, egid %d)\n",
- (int)gid,(int)getgid(),(int)getegid());
- if (gid > 32000) {
- printf("<p> Looks like your OS doesn't like high gid values - try using a different account\n");
- }
- return(False);
- }
- return(True);
-}
+ if (getuid() != uid || geteuid() != uid ||
+ getgid() != gid || getegid() != gid) {
+ /* We failed to lose our privilages. */
+ return False;
+ }
-/****************************************************************************
- become the specified uid and gid
-****************************************************************************/
-static BOOL become_id(uid_t uid,gid_t gid)
-{
- return(become_gid(gid) && become_uid(uid));
+ return(True);
}
/****************************************************************************
@@ -881,19 +869,6 @@ static void chg_passwd(void)
}
}
- /* Get the UID/GID of the user, and become that user */
- if (am_root() == False) {
- pass = Get_Pwnam(cgi_variable(user),True);
- if (pass == NULL) {
- printf("<p> User uid unknown \n");
- } else {
- if (become_id(pass->pw_uid, pass->pw_gid) == False) {
- printf("<p> uid/gid set failed \n");
- return;
- }
- }
- }
-
#ifdef SWAT_DEBUG
if (pass) printf("<p> User uid %d gid %d \n", pass->pw_uid, pass->pw_gid);
printf("<p> Processes uid %d, euid %d, gid %d, egid %d \n",getuid(),geteuid(),getgid(),getegid());
@@ -1138,4 +1113,3 @@ static void printers_page(void)
print_footer();
return 0;
}
-
generated by cgit (git 2.34.1) at 2024-11-13 01:00:42 +0000