mirror of
https://github.com/SoftEtherVPN/SoftEtherVPN.git
synced 2024-12-24 17:19:52 +03:00
SMB Winbind NT Authentication (Password/MsCHAPv2) (#49)
Added Linux NT Authentication functionality to SoftEther through samba ntlm_auth. Pre requirements + samba-winbind -> Domain Member + winbind-seperator \ -> used for group check in ntlm_auth username from client: fqdn domain\username username in SoftEther: username timeout: from security policy optional: set groupname in servermanager
This commit is contained in:
Tim Schneider
Moataz Elmasry
parent
7f499d0e5f
commit
bc2efe9efd
406
src/Cedar/Sam.c
406
src/Cedar/Sam.c
@ -113,6 +113,347 @@
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#include "CedarPch.h"
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int base64_enc_len(unsigned int plainLen) {
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unsigned int n = plainLen;
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return (n + 2 - ((n + 2) % 3)) / 3 * 4;
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}
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PID OpenChildProcess(const char* path, char* const parameter[], int fd[] )
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{
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#ifdef OS_WIN32
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// not implemented
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return -1;
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#else // OS_WIN32
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// UNIX
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int fds[2][2];
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PID pid;
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if (path == NULL || parameter == NULL || fd == NULL)
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{
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return (PID)-1;
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}
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if (pipe(fds[0]) != 0)
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{
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return (PID)-1;
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}
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if (pipe(fds[1]) != 0)
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{
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close(fds[0][0]);
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close(fds[0][1]);
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return (PID)-1;
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}
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pid = fork();
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if (pid == (PID)0) {
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int iError;
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close(fds[0][1]);
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close(fds[1][0]);
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if (dup2(fds[0][0], fileno(stdin)) < 0 || dup2(fds[1][1], fileno(stdout)) < 0 )
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{
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close(fds[0][0]);
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close(fds[1][1]);
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_exit(EXIT_FAILURE);
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}
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iError = execvp(path, parameter);
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// We should never come here
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close(fds[0][0]);
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close(fds[1][1]);
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_exit(iError);
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}
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else if (pid > (PID)0)
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{
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close(fds[0][0]);
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close(fds[1][1]);
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fd[0] = fds[1][0];
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fd[1] = fds[0][1];
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return pid;
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}
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else
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{
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close(fds[0][0]);
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close(fds[1][1]);
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close(fds[0][1]);
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close(fds[1][0]);
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return -1;
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}
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#endif // OS_WIN32
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}
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void CloseChildProcess(PID pid, int* fd )
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{
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#ifdef OS_WIN32
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// not implemented
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#else // OS_WIN32
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if( fd != 0 )
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{
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close(fd[0]);
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close(fd[1]);
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}
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if( pid > 0 )
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{
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kill(pid, SIGTERM);
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}
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#endif // OS_WIN32
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}
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bool SmbAuthenticate(char* name, char* password, char* domainname, char* groupname, UINT timeout, UCHAR* challenge8, UCHAR* MsChapV2_ClientResponse, UCHAR* nt_pw_hash_hash)
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{
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bool auth = false;
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int fds[2];
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FILE* out, *in;
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PID pid;
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char buffer[255];
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char ntlm_timeout[32];
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char* proc_parameter[6];
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if (name == NULL || password == NULL || domainname == NULL || groupname == NULL)
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{
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Debug("Sam.c - SmbAuthenticate - wrong password parameter\n");
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return false;
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}
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if (password[0] == '\0' && (challenge8 == NULL || MsChapV2_ClientResponse == NULL || nt_pw_hash_hash == NULL))
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{
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Debug("Sam.c - SmbAuthenticate - wrong MsCHAPv2 parameter\n");
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return false;
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}
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Zero(buffer, sizeof(buffer));
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// Truncate string if unsafe char
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EnSafeStr(domainname, '\0');
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if (strlen(domainname) > 255)
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{
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// there is no domainname longer then 255 chars!
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// http://tools.ietf.org/html/rfc1035 section 2.3.4
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domainname[255] = '\0';
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}
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// set timeout to 15 minutes even if timeout is disabled, to prevent ntlm_auth from hung up
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if (timeout <= 0 || timeout > 900)
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{
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timeout = 999;
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}
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snprintf(ntlm_timeout, sizeof(ntlm_timeout), "%is", timeout);
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Debug("Sam.c - timeout for ntlm_auth %s\n", ntlm_timeout);
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proc_parameter[0] = "timeout";
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proc_parameter[1] = ntlm_timeout;
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proc_parameter[2] = "ntlm_auth";
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proc_parameter[3] = "--helper-protocol=ntlm-server-1";
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proc_parameter[4] = 0;
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if (strlen(groupname) > 1)
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{
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// DNS Name 255 chars + OU names are limited to 64 characters + cmdline 32 + 1
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char requiremember[352];
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// Truncate string if unsafe char
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EnSafeStr(groupname, '\0');
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snprintf(requiremember, sizeof(requiremember), "--require-membership-of=%s\\%s", domainname, groupname);
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proc_parameter[4] = requiremember;
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proc_parameter[5] = 0;
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}
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pid = OpenChildProcess("timeout", proc_parameter, fds);
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if (pid < 0)
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{
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Debug("Sam.c - SmbCheckLogon - error fork child process (ntlm_auth)\n");
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return false;
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}
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out = fdopen(fds[1], "w");
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if (out == 0)
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{
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CloseChildProcess(pid, fds);
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Debug("Sam.c - cant open out pipe (ntlm_auth)\n");
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return false;
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}
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in = fdopen(fds[0], "r");
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if (in == 0)
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{
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fclose(out);
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CloseChildProcess(pid, fds);
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Debug("Sam.c - cant open in pipe (ntlm_auth)\n");
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return false;
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}
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if (base64_enc_len(strlen(name)) < sizeof(buffer)-1 &&
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base64_enc_len(strlen(password)) < sizeof(buffer)-1 &&
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base64_enc_len(strlen(domainname)) < sizeof(buffer)-1)
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{
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char answer[300];
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unsigned int end = B64_Encode(buffer, name, strlen(name));
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buffer[end] = '\0';
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fputs("Username:: ", out);
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fputs(buffer, out);
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fputs("\n", out);
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Debug("Username: %s\n", buffer);
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buffer[0] = 0;
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end = B64_Encode(buffer, domainname, strlen(domainname));
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buffer[end] = '\0';
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fputs("NT-Domain:: ", out);
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fputs(buffer, out);
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fputs("\n", out);
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Debug("NT-Domain: %s\n", buffer);
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buffer[0] = 0;
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if (password[0] != '\0')
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{
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Debug("Password authentication\n");
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end = B64_Encode(buffer, password, strlen(password));
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buffer[end] = '\0';
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fputs("Password:: ", out);
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fputs(buffer, out);
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fputs("\n", out);
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Debug("Password: %s\n", buffer);
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buffer[0] = 0;
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}
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else
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{
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char* mschapv2_client_response;
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char* base64_challenge8;
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Debug("MsChapV2 authentication\n");
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mschapv2_client_response = CopyBinToStr(MsChapV2_ClientResponse, 24);
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end = B64_Encode(buffer, mschapv2_client_response, 48);
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buffer[end] = '\0';
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fputs("NT-Response:: ", out);
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fputs(buffer, out);
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fputs("\n", out);
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Debug("NT-Response:: %s\n", buffer);
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buffer[0] = 0;
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Free(mschapv2_client_response);
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base64_challenge8 = CopyBinToStr(challenge8, 8);
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end = B64_Encode(buffer, base64_challenge8 , 16);
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buffer[end] = '\0';
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fputs("LANMAN-Challenge:: ", out);
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fputs(buffer, out);
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fputs("\n", out);
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Debug("LANMAN-Challenge:: %s\n", buffer);
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buffer[0] = 0;
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Free(base64_challenge8);
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fputs("Request-User-Session-Key: Yes\n", out);
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}
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// Start authentication
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fputs( ".\n", out );
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fflush (out);
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// Request send!
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Zero(answer, sizeof(answer));
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while (fgets(answer, sizeof(answer)-1, in))
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{
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char* response_parameter;
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if (strncmp(answer, ".\n", sizeof(answer)-1 ) == 0)
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{
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break;
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}
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/* Indicates a base64 encoded structure */
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response_parameter = strstr(answer, ":: ");
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if (!response_parameter) {
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char* newline;
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response_parameter = strstr(answer, ": ");
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if (!response_parameter) {
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continue;
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}
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response_parameter[0] ='\0';
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response_parameter++;
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response_parameter[0] ='\0';
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response_parameter++;
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newline = strstr(response_parameter, "\n");
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if( newline )
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newline[0] = '\0';
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} else {
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response_parameter[0] ='\0';
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response_parameter++;
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response_parameter[0] ='\0';
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response_parameter++;
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response_parameter[0] ='\0';
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response_parameter++;
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end = Decode64(response_parameter, response_parameter);
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response_parameter[end] = '\0';
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}
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if (strncmp(answer, "Authenticated", sizeof(answer)-1 ) == 0)
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{
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if (strcmp(response_parameter, "Yes") == 0)
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{
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Debug("Authenticated!\n");
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auth = true;
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}
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else if (strcmp(response_parameter, "No") == 0)
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{
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Debug("Authentication failed!\n");
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auth = false;
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}
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}
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else if (strncmp(answer, "User-Session-Key", sizeof(answer)-1 ) == 0)
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{
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if (nt_pw_hash_hash != NULL)
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{
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BUF* Buf = StrToBin(response_parameter);
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Copy(nt_pw_hash_hash, Buf->Buf, 16);
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FreeBuf(Buf);
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}
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}
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}
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}
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fclose(in);
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fclose(out);
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CloseChildProcess(pid, fds);
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return auth;
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}
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bool SmbCheckLogon(char* name, char* password, char* domainname, char* groupname, UINT timeout)
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{
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return SmbAuthenticate(name, password, domainname, groupname, timeout, NULL, NULL, NULL);
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}
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bool SmbPerformMsChapV2Auth(char* name, char* domainname, char* groupname, UCHAR* challenge8, UCHAR* MsChapV2_ClientResponse, UCHAR* nt_pw_hash_hash, UINT timeout)
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{
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return SmbAuthenticate(name, "", domainname, groupname, timeout, challenge8, MsChapV2_ClientResponse, nt_pw_hash_hash);
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}
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// Password encryption
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void SecurePassword(void *secure_password, void *password, void *random)
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{
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@ -179,6 +520,8 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
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{
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bool b = false;
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wchar_t *name = NULL;
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wchar_t *groupname = NULL;
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UINT timeout = 90;
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bool auth_by_nt = false;
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HUB *h;
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// Validate arguments
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@ -242,6 +585,14 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
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{
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name = CopyUniStr(auth->NtUsername);
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}
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groupname = CopyStrToUni(u->GroupName);
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if (u->Policy)
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{
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timeout = u->Policy->TimeOut;
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}
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auth_by_nt = true;
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}
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}
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@ -298,7 +649,7 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
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}
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else
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{
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// NT authentication (Not available for non-Win32)
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// NT authentication
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#ifdef OS_WIN32
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IPC_MSCHAP_V2_AUTHINFO mschap;
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Unlock(hub->lock);
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@ -337,11 +688,60 @@ bool SamAuthUserByPlainPassword(CONNECTION *c, HUB *hub, char *username, char *p
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Lock(hub->lock);
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#else // OS_WIN32
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// Nothing to do other than Win32
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#endif // OS_WIN32
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// Unix / Samba Winbind
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IPC_MSCHAP_V2_AUTHINFO mschap;
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Unlock(hub->lock);
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char nt_name[MAX_SIZE];
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char nt_username[MAX_SIZE];
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char nt_groupname[MAX_SIZE];
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char nt_domainname[MAX_SIZE];
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UCHAR challenge8[8];
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UCHAR nt_pw_hash_hash[16];
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nt_groupname[0] = 0;
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UniToStr(nt_name, sizeof(nt_name), name);
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if (groupname != NULL)
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UniToStr(nt_groupname, sizeof(nt_groupname), groupname);
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ParseNtUsername(nt_name, nt_username, sizeof(nt_username), nt_domainname, sizeof(nt_domainname), false);
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if (ParseAndExtractMsChapV2InfoFromPassword(&mschap, password) == false)
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{
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// Plaintext password authentication
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b = SmbCheckLogon(nt_username, password, nt_domainname, nt_groupname, timeout);
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}
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else
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{
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// MS-CHAPv2 authentication
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MsChapV2_GenerateChallenge8(challenge8, mschap.MsChapV2_ClientChallenge,
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mschap.MsChapV2_ServerChallenge,
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mschap.MsChapV2_PPPUsername);
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Debug("MsChapV2_PPPUsername = %s, nt_name = %s\n", mschap.MsChapV2_PPPUsername, nt_name);
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b = SmbPerformMsChapV2Auth(nt_username, nt_domainname, nt_groupname, challenge8, mschap.MsChapV2_ClientResponse, nt_pw_hash_hash, timeout);
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if (b)
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{
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if (mschap_v2_server_response_20 != NULL)
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{
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MsChapV2Server_GenerateResponse(mschap_v2_server_response_20, nt_pw_hash_hash,
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mschap.MsChapV2_ClientResponse, challenge8);
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}
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}
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}
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Lock(hub->lock);
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#endif // OS_WIN32 / OS_LINUX
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}
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// Memory release
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if( groupname != NULL )
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Free(groupname);
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Free(name);
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}
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@ -254,6 +254,14 @@ typedef int (COMPARE)(void *p1, void *p2);
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// Type declaration
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//
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// PID type
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#ifdef OS_UNIX
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typedef int PID;
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#endif // OS_UNIX
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#ifdef OS_WIN32
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typedef unsigned long PID;
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#endif // WINDOWS_H
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// bool type
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#ifndef WINDOWS_H
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typedef unsigned int BOOL;
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