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-rw-r--r--source3/libsmb/nterr.c28
-rw-r--r--source3/nsswitch/winbindd_nss.h3
-rw-r--r--source3/nsswitch/winbindd_pam.c119
-rw-r--r--source3/utils/ntlm_auth.c151
4 files changed, 258 insertions, 43 deletions
diff --git a/source3/libsmb/nterr.c b/source3/libsmb/nterr.c
index 166229ec6c..b01451ea0f 100644
--- a/source3/libsmb/nterr.c
+++ b/source3/libsmb/nterr.c
@@ -717,3 +717,31 @@ NTSTATUS nt_status_string_to_code(char *nt_status_str)
}
return NT_STATUS_UNSUCCESSFUL;
}
+
+
+/**
+ * Squash an NT_STATUS in line with security requirements.
+ * In an attempt to avoid giving the whole game away when users
+ * are authenticating, NT replaces both NT_STATUS_NO_SUCH_USER and
+ * NT_STATUS_WRONG_PASSWORD with NT_STATUS_LOGON_FAILURE in certain situations
+ * (session setups in particular).
+ *
+ * @param nt_status NTSTATUS input for squashing.
+ * @return the 'squashed' nt_status
+ **/
+
+NTSTATUS nt_status_squash(NTSTATUS nt_status)
+{
+ if NT_STATUS_IS_OK(nt_status) {
+ return nt_status;
+ } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_SUCH_USER) {
+ /* Match WinXP and don't give the game away */
+ return NT_STATUS_LOGON_FAILURE;
+
+ } else if NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) {
+ /* Match WinXP and don't give the game away */
+ return NT_STATUS_LOGON_FAILURE;
+ } else {
+ return nt_status;
+ }
+}
diff --git a/source3/nsswitch/winbindd_nss.h b/source3/nsswitch/winbindd_nss.h
index d0c80412df..4ddce11951 100644
--- a/source3/nsswitch/winbindd_nss.h
+++ b/source3/nsswitch/winbindd_nss.h
@@ -157,6 +157,7 @@ typedef struct winbindd_gr {
#define WBFLAG_ALLOCATE_RID 0x0040
#define WBFLAG_PAM_UNIX_NAME 0x0080
#define WBFLAG_PAM_AFS_TOKEN 0x0100
+#define WBFLAG_PAM_NT_STATUS_SQUASH 0x0200
/* Winbind request structure */
@@ -179,6 +180,7 @@ struct winbindd_request {
character is. */
fstring user;
fstring pass;
+ fstring required_membership_sid;
} auth; /* pam_winbind auth module */
struct {
unsigned char chal[8];
@@ -189,6 +191,7 @@ struct winbindd_request {
fstring nt_resp;
uint16 nt_resp_len;
fstring workstation;
+ fstring required_membership_sid;
} auth_crap;
struct {
fstring user;
diff --git a/source3/nsswitch/winbindd_pam.c b/source3/nsswitch/winbindd_pam.c
index f3e7daa6bf..a2ebe0ddbc 100644
--- a/source3/nsswitch/winbindd_pam.c
+++ b/source3/nsswitch/winbindd_pam.c
@@ -54,8 +54,98 @@ static NTSTATUS append_info3_as_ndr(TALLOC_CTX *mem_ctx,
return NT_STATUS_OK;
}
+static NTSTATUS check_info3_in_group(TALLOC_CTX *mem_ctx,
+ NET_USER_INFO_3 *info3,
+ const char *group_sid)
+{
+ DOM_SID required_membership_sid;
+ DOM_SID *all_sids;
+ size_t num_all_sids = (2 + info3->num_groups2 + info3->num_other_sids);
+ size_t i, j = 0;
+
+ /* Parse the 'required group' SID */
+
+ if (!group_sid || !group_sid[0]) {
+ /* NO sid supplied, all users may access */
+ return NT_STATUS_OK;
+ }
+
+ if (!string_to_sid(&required_membership_sid, group_sid)) {
+ DEBUG(0, ("winbindd_pam_auth: could not parse %s as a SID!",
+ group_sid));
+
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ all_sids = talloc(mem_ctx, sizeof(DOM_SID) * num_all_sids);
+ if (!all_sids)
+ return NT_STATUS_NO_MEMORY;
+
+ /* and create (by appending rids) the 'domain' sids */
+
+ sid_copy(&all_sids[0], &(info3->dom_sid.sid));
+
+ if (!sid_append_rid(&all_sids[0], info3->user_rid)) {
+ DEBUG(3,("could not append user's primary RID 0x%x\n",
+ info3->user_rid));
+
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ j++;
+
+ sid_copy(&all_sids[1], &(info3->dom_sid.sid));
+
+ if (!sid_append_rid(&all_sids[1], info3->group_rid)) {
+ DEBUG(3,("could not append additional group rid 0x%x\n",
+ info3->group_rid));
+
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ j++;
+
+ for (i = 0; i < info3->num_groups2; i++) {
+
+ sid_copy(&all_sids[j], &(info3->dom_sid.sid));
+
+ if (!sid_append_rid(&all_sids[j], info3->gids[j].g_rid)) {
+ DEBUG(3,("could not append additional group rid 0x%x\n",
+ info3->gids[j].g_rid));
+
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+ j++;
+ }
+
+ /* Copy 'other' sids. We need to do sid filtering here to
+ prevent possible elevation of privileges. See:
+
+ http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
+ */
+
+ for (i = 0; i < info3->num_other_sids; j++) {
+ sid_copy(&all_sids[info3->num_groups2 + i + 2],
+ &info3->other_sids[j].sid);
+ j++;
+ }
+
+ for (i = 0; i < j; i++) {
+ fstring sid1, sid2;
+ DEBUG(10, ("User has SID: %s\n",
+ sid_to_string(sid1, &all_sids[i])));
+ if (sid_equal(&required_membership_sid, &all_sids[i])) {
+ DEBUG(10, ("SID %s matches %s - user permitted to authenticate!\n",
+ sid_to_string(sid1, &required_membership_sid), sid_to_string(sid2, &all_sids[i])));
+ return NT_STATUS_OK;
+ }
+ }
+
+ /* Do not distinguish this error from a wrong username/pw */
+
+ return NT_STATUS_LOGON_FAILURE;
+}
+
/**********************************************************************
- Authenticate a user with a clear test password
+ Authenticate a user with a clear text password
**********************************************************************/
enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
@@ -125,7 +215,7 @@ enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
}
if (!(contact_domain = find_our_domain())) {
- DEBUG(1, ("Authenticatoin for [%s] -> [%s]\\[%s] in our domain failed - we can't find our domain!\n",
+ DEBUG(1, ("Authentication for [%s] -> [%s]\\[%s] in our domain failed - we can't find our domain!\n",
state->request.data.auth.user, name_domain, name_user));
result = NT_STATUS_NO_SUCH_USER;
goto done;
@@ -190,8 +280,16 @@ enum winbindd_result winbindd_pam_auth(struct winbindd_cli_state *state)
if (NT_STATUS_IS_OK(result)) {
netsamlogon_cache_store( cli->mem_ctx, &info3 );
wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
+
+ /* Check if the user is in the right group */
+
+ if (!NT_STATUS_IS_OK(result = check_info3_in_group(mem_ctx, &info3, state->request.data.auth.required_membership_sid))) {
+ DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
+ state->request.data.auth.user,
+ state->request.data.auth.required_membership_sid));
+ }
}
-
+
done:
/* give us a more useful (more correct?) error code */
if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
@@ -355,7 +453,7 @@ enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
if ( IS_DC ) {
if (!(contact_domain = find_domain_from_name(name_domain))) {
DEBUG(3, ("Authentication for domain for [%s] -> [%s]\\[%s] failed as %s is not a trusted domain\n",
- state->request.data.auth.user, name_domain, name_user, name_domain));
+ state->request.data.auth_crap.user, name_domain, name_user, name_domain));
result = NT_STATUS_NO_SUCH_USER;
goto done;
}
@@ -369,7 +467,7 @@ enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
if (!(contact_domain = find_our_domain())) {
DEBUG(1, ("Authenticatoin for [%s] -> [%s]\\[%s] in our domain failed - we can't find our domain!\n",
- state->request.data.auth.user, name_domain, name_user));
+ state->request.data.auth_crap.user, name_domain, name_user));
result = NT_STATUS_NO_SUCH_USER;
goto done;
}
@@ -434,6 +532,13 @@ enum winbindd_result winbindd_pam_auth_crap(struct winbindd_cli_state *state)
netsamlogon_cache_store( cli->mem_ctx, &info3 );
wcache_invalidate_samlogon(find_domain_from_name(name_domain), &info3);
+ if (!NT_STATUS_IS_OK(result = check_info3_in_group(mem_ctx, &info3, state->request.data.auth_crap.required_membership_sid))) {
+ DEBUG(3, ("User %s is not in the required group (%s), so plaintext authentication is rejected\n",
+ state->request.data.auth_crap.user,
+ state->request.data.auth_crap.required_membership_sid));
+ goto done;
+ }
+
if (state->request.flags & WBFLAG_PAM_INFO3_NDR) {
result = append_info3_as_ndr(mem_ctx, state, &info3);
} else if (state->request.flags & WBFLAG_PAM_UNIX_NAME) {
@@ -477,6 +582,10 @@ done:
if ((NT_STATUS_EQUAL(result, NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND) || (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)))) {
result = NT_STATUS_NO_LOGON_SERVERS;
}
+
+ if (state->request.flags & WBFLAG_PAM_NT_STATUS_SQUASH) {
+ result = nt_status_squash(result);
+ }
state->response.data.auth.nt_status = NT_STATUS_V(result);
push_utf8_fstring(state->response.data.auth.nt_status_string, nt_errstr(result));
diff --git a/source3/utils/ntlm_auth.c b/source3/utils/ntlm_auth.c
index c06290c24e..c926d07698 100644
--- a/source3/utils/ntlm_auth.c
+++ b/source3/utils/ntlm_auth.c
@@ -3,8 +3,8 @@
Winbind status program.
- Copyright (C) Tim Potter 2000-2002
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
+ Copyright (C) Tim Potter 2000-2003
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003-2004
Copyright (C) Francesco Chemolli <kinkie@kame.usr.dsi.unimi.it> 2000
This program is free software; you can redistribute it and/or modify
@@ -91,6 +91,8 @@ static DATA_BLOB opt_nt_response;
static int request_lm_key;
static int request_nt_key;
+static const char *require_membership_of;
+static const char *require_membership_sid;
static char winbind_separator(void)
{
@@ -138,7 +140,7 @@ static const char *get_winbind_domain(void)
if (winbindd_request(WINBINDD_DOMAIN_NAME, NULL, &response) !=
NSS_STATUS_SUCCESS) {
DEBUG(0, ("could not obtain winbind domain name!\n"));
- return NULL;
+ exit(1);
}
fstrcpy(winbind_domain, response.data.domain_name);
@@ -173,14 +175,79 @@ static const char *get_winbind_netbios_name(void)
}
+/* Copy of parse_domain_user from winbindd_util.c. Parse a string of the
+ form DOMAIN/user into a domain and a user */
+
+static BOOL parse_ntlm_auth_domain_user(const char *domuser, fstring domain,
+ fstring user)
+{
+
+ char *p = strchr(domuser,winbind_separator());
+
+ if (!p) {
+ return False;
+ }
+
+ fstrcpy(user, p+1);
+ fstrcpy(domain, domuser);
+ domain[PTR_DIFF(p, domuser)] = 0;
+ strupper_m(domain);
+
+ return True;
+}
+
+static BOOL get_require_membership_sid(void) {
+ struct winbindd_request request;
+ struct winbindd_response response;
+
+ if (!require_membership_of) {
+ return True;
+ }
+
+ if (require_membership_sid) {
+ return True;
+ }
+
+ /* Otherwise, ask winbindd for the name->sid request */
+
+ ZERO_STRUCT(request);
+ ZERO_STRUCT(response);
+
+ if (!parse_ntlm_auth_domain_user(require_membership_of,
+ request.data.name.dom_name,
+ request.data.name.name)) {
+ DEBUG(0, ("Could not parse %s into seperate domain/name parts!\n",
+ require_membership_of));
+ return False;
+ }
+
+ if (winbindd_request(WINBINDD_LOOKUPNAME, &request, &response) !=
+ NSS_STATUS_SUCCESS) {
+ DEBUG(0, ("Winbindd lookupname failed to resolve %s into a SID!\n",
+ require_membership_of));
+ return False;
+ }
+
+ require_membership_sid = strdup(response.data.sid.sid);
+
+ if (require_membership_sid)
+ return True;
+
+ return False;
+}
/* Authenticate a user with a plaintext password */
-static BOOL check_plaintext_auth(const char *user, const char *pass, BOOL stdout_diagnostics)
+static BOOL check_plaintext_auth(const char *user, const char *pass,
+ BOOL stdout_diagnostics)
{
struct winbindd_request request;
struct winbindd_response response;
NSS_STATUS result;
+ if (!get_require_membership_sid()) {
+ return False;
+ }
+
/* Send off request */
ZERO_STRUCT(request);
@@ -188,6 +255,8 @@ static BOOL check_plaintext_auth(const char *user, const char *pass, BOOL stdout
fstrcpy(request.data.auth.user, user);
fstrcpy(request.data.auth.pass, pass);
+ if (require_membership_sid)
+ fstrcpy(request.data.auth.required_membership_sid, require_membership_sid);
result = winbindd_request(WINBINDD_PAM_AUTH, &request, &response);
@@ -237,11 +306,18 @@ static NTSTATUS contact_winbind_auth_crap(const char *username,
static uint8 zeros[16];
+ if (!get_require_membership_sid()) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
ZERO_STRUCT(request);
ZERO_STRUCT(response);
request.flags = flags;
+ if (require_membership_sid)
+ fstrcpy(request.data.auth_crap.required_membership_sid, require_membership_sid);
+
if (push_utf8_fstring(request.data.auth_crap.user, username) == -1) {
*error_string = smb_xstrdup(
"unable to create utf8 string for username");
@@ -264,12 +340,16 @@ static NTSTATUS contact_winbind_auth_crap(const char *username,
memcpy(request.data.auth_crap.chal, challenge->data, MIN(challenge->length, 8));
if (lm_response && lm_response->length) {
- memcpy(request.data.auth_crap.lm_resp, lm_response->data, MIN(lm_response->length, sizeof(request.data.auth_crap.lm_resp)));
+ memcpy(request.data.auth_crap.lm_resp,
+ lm_response->data,
+ MIN(lm_response->length, sizeof(request.data.auth_crap.lm_resp)));
request.data.auth_crap.lm_resp_len = lm_response->length;
}
if (nt_response && nt_response->length) {
- memcpy(request.data.auth_crap.nt_resp, nt_response->data, MIN(nt_response->length, sizeof(request.data.auth_crap.nt_resp)));
+ memcpy(request.data.auth_crap.nt_resp,
+ nt_response->data,
+ MIN(nt_response->length, sizeof(request.data.auth_crap.nt_resp)));
request.data.auth_crap.nt_resp_len = nt_response->length;
}
@@ -346,7 +426,9 @@ static NTSTATUS winbind_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB
} else {
DEBUG(NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED) ? 0 : 3,
("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
- ntlmssp_state->domain, ntlmssp_state->user, ntlmssp_state->workstation, error_string ? error_string : "unknown error (NULL)"));
+ ntlmssp_state->domain, ntlmssp_state->user,
+ ntlmssp_state->workstation,
+ error_string ? error_string : "unknown error (NULL)"));
ntlmssp_state->auth_context = NULL;
}
return nt_status;
@@ -382,7 +464,10 @@ static NTSTATUS local_pw_check(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *u
if (memcmp(nt_key, zeros, 16) != 0) {
*user_session_key = data_blob(nt_key, 16);
}
- ntlmssp_state->auth_context = talloc_asprintf(ntlmssp_state->mem_ctx, "%s%c%s", ntlmssp_state->domain, *lp_winbind_separator(), ntlmssp_state->user);
+ ntlmssp_state->auth_context = talloc_asprintf(ntlmssp_state->mem_ctx,
+ "%s%c%s", ntlmssp_state->domain,
+ *lp_winbind_separator(),
+ ntlmssp_state->user);
} else {
DEBUG(3, ("Login for user [%s]\\[%s]@[%s] failed due to [%s]\n",
ntlmssp_state->domain, ntlmssp_state->user, ntlmssp_state->workstation,
@@ -1381,6 +1466,8 @@ static BOOL check_auth_crap(void)
if (request_nt_key)
flags |= WBFLAG_PAM_USER_SESSION_KEY;
+ flags |= WBFLAG_PAM_NT_STATUS_SQUASH;
+
nt_status = contact_winbind_auth_crap(opt_username, opt_domain,
opt_workstation,
&opt_challenge,
@@ -1773,7 +1860,7 @@ static BOOL test_lmv2_ntlmv2_broken(enum ntlm_break break_which)
if (break_which != NO_NT && break_which != BREAK_NT && memcmp(user_session_key.data, nt_key,
sizeof(nt_key)) != 0) {
- DEBUG(1, ("USER Session Key does not match expectations!\n"));
+ DEBUG(1, ("USER (NT) Session Key does not match expectations!\n"));
DEBUG(1, ("nt_key:\n"));
dump_data(1, (const char *)nt_key, 16);
DEBUG(1, ("expected:\n"));
@@ -2008,7 +2095,8 @@ enum {
OPT_PASSWORD,
OPT_LM_KEY,
OPT_NT_KEY,
- OPT_DIAGNOSTICS
+ OPT_DIAGNOSTICS,
+ OPT_REQUIRE_MEMBERSHIP
};
int main(int argc, const char **argv)
@@ -2020,12 +2108,6 @@ enum {
static const char *hex_challenge;
static const char *hex_lm_response;
static const char *hex_nt_response;
- char *challenge;
- char *lm_response;
- char *nt_response;
- size_t challenge_len;
- size_t lm_response_len;
- size_t nt_response_len;
poptContext pc;
@@ -2050,6 +2132,7 @@ enum {
{ "request-lm-key", 0, POPT_ARG_NONE, &request_lm_key, OPT_LM_KEY, "Retreive LM session key"},
{ "request-nt-key", 0, POPT_ARG_NONE, &request_nt_key, OPT_NT_KEY, "Retreive NT session key"},
{ "diagnostics", 0, POPT_ARG_NONE, &diagnostics, OPT_DIAGNOSTICS, "Perform diagnostics on the authentictaion chain"},
+ { "require-membership-of", 0, POPT_ARG_STRING, &require_membership_of, OPT_REQUIRE_MEMBERSHIP, "Require that a user be a member of this group (either name or SID) for authentication to succeed" },
POPT_COMMON_SAMBA
POPT_TABLEEND
};
@@ -2083,40 +2166,32 @@ enum {
while((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
case OPT_CHALLENGE:
- challenge = smb_xmalloc((strlen(hex_challenge))/2+1);
- if ((challenge_len = strhex_to_str(challenge,
- strlen(hex_challenge),
- hex_challenge)) != 8) {
- x_fprintf(x_stderr, "hex decode of %s failed (only got %lu bytes)!\n",
- hex_challenge, (unsigned long)challenge_len);
+ opt_challenge = strhex_to_data_blob(hex_challenge);
+ if (opt_challenge.length != 8) {
+ x_fprintf(x_stderr, "hex decode of %s failed!\n", hex_challenge);
exit(1);
}
- opt_challenge = data_blob(challenge, challenge_len);
- SAFE_FREE(challenge);
break;
case OPT_LM:
- lm_response = smb_xmalloc((strlen(hex_lm_response))/2+1);
- lm_response_len = strhex_to_str(lm_response,
- strlen(hex_lm_response),
- hex_lm_response);
- if (lm_response_len != 24) {
+ opt_lm_response = strhex_to_data_blob(hex_lm_response);
+ if (opt_lm_response.length != 24) {
x_fprintf(x_stderr, "hex decode of %s failed!\n", hex_lm_response);
exit(1);
}
- opt_lm_response = data_blob(lm_response, lm_response_len);
- SAFE_FREE(lm_response);
break;
+
case OPT_NT:
- nt_response = smb_xmalloc((strlen(hex_nt_response)+2)/2+1);
- nt_response_len = strhex_to_str(nt_response,
- strlen(hex_nt_response),
- hex_nt_response);
- if (nt_response_len < 24) {
+ opt_nt_response = strhex_to_data_blob(hex_nt_response);
+ if (opt_nt_response.length < 24) {
x_fprintf(x_stderr, "hex decode of %s failed!\n", hex_nt_response);
exit(1);
}
- opt_nt_response = data_blob(nt_response, nt_response_len);
- SAFE_FREE(nt_response);
+ break;
+
+ case OPT_REQUIRE_MEMBERSHIP:
+ if (StrnCaseCmp("S-", require_membership_of, 2) == 0) {
+ require_membership_sid = require_membership_of;
+ }
break;
}
}
generated by cgit (git 2.34.1) at 2024-11-10 10:52:27 +0000