[u/mdw/putty] / pageant.c

/*
 * Pageant: the PuTTY Authentication Agent.
 */

#include <windows.h>
#include <stdio.h> /* FIXME */
#include "putty.h" /* FIXME */
#include "ssh.h"
#include "tree234.h"

#define IDI_MAINICON 200
#define IDI_TRAYICON 201

#define WM_XUSER     (WM_USER + 0x2000)
#define WM_SYSTRAY   (WM_XUSER + 6)
#define WM_SYSTRAY2  (WM_XUSER + 7)
#define WM_CLOSEMEM  (WM_XUSER + 10)

#define IDM_CLOSE    0x0010
#define IDM_VIEWKEYS 0x0020

#define APPNAME "Pageant"

#define MAILSLOTNAME "\\\\.\\mailslot\\pageant_listener"

#define SSH_AGENTC_REQUEST_RSA_IDENTITIES    1
#define SSH_AGENT_RSA_IDENTITIES_ANSWER      2
#define SSH_AGENTC_RSA_CHALLENGE             3
#define SSH_AGENT_RSA_RESPONSE               4
#define SSH_AGENT_FAILURE                    5
#define SSH_AGENT_SUCCESS                    6
#define SSH_AGENTC_ADD_RSA_IDENTITY          7
#define SSH_AGENTC_REMOVE_RSA_IDENTITY       8

HINSTANCE instance;
HWND hwnd;
HWND keylist;
HMENU systray_menu;

tree234 *rsakeys;

/*
 * We need this to link with the RSA code, because rsaencrypt()
 * pads its data with random bytes. Since we only use rsadecrypt(),
 * which is deterministic, this should never be called.
 *
 * If it _is_ called, there is a _serious_ problem, because it
 * won't generate true random numbers. So we must scream, panic,
 * and exit immediately if that should happen.
 */
int random_byte(void) {
    MessageBox(hwnd, "Internal Error", APPNAME, MB_OK | MB_ICONERROR);
    exit(0);
}

/*
 * This function is needed to link with the DES code. We need not
 * have it do anything at all.
 */
void logevent(char *msg) {
}

#define GET_32BIT(cp) \
    (((unsigned long)(unsigned char)(cp)[0] << 24) | \
    ((unsigned long)(unsigned char)(cp)[1] << 16) | \
    ((unsigned long)(unsigned char)(cp)[2] << 8) | \
    ((unsigned long)(unsigned char)(cp)[3]))

#define PUT_32BIT(cp, value) { \
    (cp)[0] = (unsigned char)((value) >> 24); \
    (cp)[1] = (unsigned char)((value) >> 16); \
    (cp)[2] = (unsigned char)((value) >> 8); \
    (cp)[3] = (unsigned char)(value); }

#define PASSPHRASE_MAXLEN 512

/*
 * Dialog-box function for the passphrase box.
 */
static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
                                   WPARAM wParam, LPARAM lParam) {
    static char *passphrase;

    switch (msg) {
      case WM_INITDIALOG:
        passphrase = (char *)lParam;
        *passphrase = 0;
        return 0;
      case WM_COMMAND:
	switch (LOWORD(wParam)) {
	  case IDOK:
	    if (*passphrase)
		EndDialog (hwnd, 1);
	    else
		MessageBeep (0);
	    return 0;
	  case IDCANCEL:
	    EndDialog (hwnd, 0);
	    return 0;
          case 102:                    /* edit box */
	    if (HIWORD(wParam) == EN_CHANGE) {
                GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
                passphrase[PASSPHRASE_MAXLEN-1] = '\0';
            }
            return 0;
	}
	return 0;
      case WM_CLOSE:
	EndDialog (hwnd, 0);
	return 0;
    }
    return 0;
}

/*
 * This function loads a key from a file and adds it.
 */
void add_keyfile(char *filename) {
    char passphrase[PASSPHRASE_MAXLEN];
    struct RSAKey *key;
    int needs_pass;
    int ret;
    int attempts;

    needs_pass = rsakey_encrypted(filename);
    attempts = 0;
    key = malloc(sizeof(*key));
    do {
        if (needs_pass) {
            int dlgret;
            dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
                                    NULL, PassphraseProc,
                                    (LPARAM)passphrase);
            if (!dlgret) {
                free(key);
                return;                /* operation cancelled */
            }
        } else
            *passphrase = '\0';
        ret = loadrsakey(filename, key, passphrase);
        attempts++;
    } while (ret == -1);
    if (ret == 0) {
        MessageBox(NULL, "Couldn't load public key.", APPNAME,
                   MB_OK | MB_ICONERROR);
        free(key);
        return;
    }
    if (add234(rsakeys, key) != key)
        free(key);                     /* already present, don't waste RAM */
}

/*
 * This is the main agent function that answers messages.
 */
void answer_msg(void *in, int inlen, void **out, int *outlen) {
    unsigned char *ret;
    unsigned char *p = in;
    int type;

    *out = NULL;                       /* default `no go' response */

    /*
     * Basic sanity checks. len >= 5, and len[0:4] holds len-4.
     */
    if (inlen < 5 || GET_32BIT(p) != (unsigned long)(inlen-4))
        return;

    /*
     * Get the message type.
     */
    type = p[4];

    p += 5;

    switch (type) {
      case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
        /*
         * Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
         */
        {
            enum234 e;
            struct RSAKey *key;
            int len, nkeys;

            /*
             * Count up the number and length of keys we hold.
             */
            len = nkeys = 0;
            for (key = first234(rsakeys, &e); key; key = next234(&e)) {
                nkeys++;
                len += 4;              /* length field */
                len += ssh1_bignum_length(key->exponent);
                len += ssh1_bignum_length(key->modulus);
                len += 4 + strlen(key->comment);
            }

            /*
             * Packet header is the obvious five bytes, plus four
             * bytes for the key count.
             */
            len += 5 + 4;
            if ((ret = malloc(len)) != NULL) {
                PUT_32BIT(ret, len-4);
                ret[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER;
                PUT_32BIT(ret+5, nkeys);
                p = ret + 5 + 4;
                for (key = first234(rsakeys, &e); key; key = next234(&e)) {
                    PUT_32BIT(p, ssh1_bignum_bitcount(key->modulus));
                    p += 4;
                    p += ssh1_write_bignum(p, key->exponent);
                    p += ssh1_write_bignum(p, key->modulus);
                    PUT_32BIT(p, strlen(key->comment));
                    memcpy(p+4, key->comment, strlen(key->comment));
                    p += 4 + strlen(key->comment);
                }
            }
        }
        break;
      case SSH_AGENTC_RSA_CHALLENGE:
        /*
         * Reply with either SSH_AGENT_RSA_RESPONSE or
         * SSH_AGENT_FAILURE, depending on whether we have that key
         * or not.
         */
        {
            struct RSAKey reqkey, *key;
            Bignum challenge, response;
            unsigned char response_source[48], response_md5[16];
            struct MD5Context md5c;
            int i, len;

            p += 4;
            p += ssh1_read_bignum(p, &reqkey.exponent);
            p += ssh1_read_bignum(p, &reqkey.modulus);
            p += ssh1_read_bignum(p, &challenge);
            memcpy(response_source+32, p, 16); p += 16;
            if (GET_32BIT(p) != 1 ||
                (key = find234(rsakeys, &reqkey, NULL)) == NULL) {
                freebn(reqkey.exponent);
                freebn(reqkey.modulus);
                freebn(challenge);
                goto failure;
            }
            response = rsadecrypt(challenge, key);
            for (i = 0; i < 32; i++)
                response_source[i] = bignum_byte(response, 31-i);

            MD5Init(&md5c);
            MD5Update(&md5c, response_source, 48);
            MD5Final(response_md5, &md5c);
            memset(response_source, 0, 48);   /* burn the evidence */
            freebn(response);          /* and that evidence */
            freebn(challenge);         /* yes, and that evidence */
            freebn(reqkey.exponent);   /* and free some memory ... */
            freebn(reqkey.modulus);    /* ... while we're at it. */

            /*
             * Packet is the obvious five byte header, plus sixteen
             * bytes of MD5.
             */
            len = 5 + 16;
            if ((ret = malloc(len)) != NULL) {
                PUT_32BIT(ret, len-4);
                ret[4] = SSH_AGENT_RSA_RESPONSE;
                memcpy(ret+5, response_md5, 16);
            }
        }
        break;
#if 0 /* FIXME: implement these */
      case SSH_AGENTC_ADD_RSA_IDENTITY:
        /*
         * Add to the list and return SSH_AGENT_SUCCESS, or
         * SSH_AGENT_FAILURE if the key was malformed.
         */
        break;
      case SSH_AGENTC_REMOVE_RSA_IDENTITY:
        /*
         * Remove from the list and return SSH_AGENT_SUCCESS, or
         * perhaps SSH_AGENT_FAILURE if it wasn't in the list to
         * start with.
         */
        break;
#endif
      default:
        failure:
        /*
         * Unrecognised message. Return SSH_AGENT_FAILURE.
         */
        if ((ret = malloc(5)) != NULL) {
            PUT_32BIT(ret, 1);
            ret[4] = SSH_AGENT_FAILURE;
        }
        break;
    }

    if (ret) {
        *out = ret;
        *outlen = 4 + GET_32BIT(ret);
    }
}

/*
 * Key comparison function for the 2-3-4 tree of RSA keys.
 */
int cmpkeys(void *av, void *bv) {
    struct RSAKey *a = (struct RSAKey *)av;
    struct RSAKey *b = (struct RSAKey *)bv;
    Bignum am, bm;
    int alen, blen;

    am = a->modulus;
    bm = b->modulus;
    /*
     * Compare by length of moduli.
     */
    alen = ssh1_bignum_bitcount(am);
    blen = ssh1_bignum_bitcount(bm);
    if (alen > blen) return +1; else if (alen < blen) return -1;
    /*
     * Now compare by moduli themselves.
     */
    alen = (alen + 7) / 8;             /* byte count */
    while (alen-- > 0) {
        int abyte, bbyte;
        abyte = bignum_byte(am, alen);
        bbyte = bignum_byte(bm, alen);
        if (abyte > bbyte) return +1; else if (abyte < bbyte) return -1;
    }
    /*
     * Give up.
     */
    return 0;
}

static void error(char *s) {
    MessageBox(hwnd, s, APPNAME, MB_OK | MB_ICONERROR);
}

/*
 * Dialog-box function for the key list box.
 */
static int CALLBACK KeyListProc(HWND hwnd, UINT msg,
                                WPARAM wParam, LPARAM lParam) {
    enum234 e;
    struct RSAKey *key;
    OPENFILENAME of;
    char filename[FILENAME_MAX];

    switch (msg) {
      case WM_INITDIALOG:
        for (key = first234(rsakeys, &e); key; key = next234(&e)) {
            SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
                                0, (LPARAM) key->comment);
        }
        return 0;
      case WM_COMMAND:
	switch (LOWORD(wParam)) {
	  case IDOK:
	  case IDCANCEL:
            keylist = NULL;
            DestroyWindow(hwnd);
            return 0;
          case 101:                    /* add key */
	    if (HIWORD(wParam) == BN_CLICKED ||
		HIWORD(wParam) == BN_DOUBLECLICKED) {
                memset(&of, 0, sizeof(of));
#ifdef OPENFILENAME_SIZE_VERSION_400
                of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
#else
                of.lStructSize = sizeof(of);
#endif
                of.hwndOwner = hwnd;
                of.lpstrFilter = "All Files\0*\0\0\0";
                of.lpstrCustomFilter = NULL;
                of.nFilterIndex = 1;
                of.lpstrFile = filename; *filename = '\0';
                of.nMaxFile = sizeof(filename);
                of.lpstrFileTitle = NULL;
                of.lpstrInitialDir = NULL;
                of.lpstrTitle = "Select Public Key File";
                of.Flags = 0;
                if (GetOpenFileName(&of)) {
                    add_keyfile(filename);
                }
                SendDlgItemMessage(hwnd, 100, LB_RESETCONTENT, 0, 0);
                for (key = first234(rsakeys, &e); key; key = next234(&e)) {
                    SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
                                        0, (LPARAM) key->comment);
                }
		SendDlgItemMessage (hwnd, 100, LB_SETCURSEL, (WPARAM) -1, 0);
            }
            return 0;
          case 102:                    /* remove key */
	    if (HIWORD(wParam) == BN_CLICKED ||
		HIWORD(wParam) == BN_DOUBLECLICKED) {
		int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
		if (n == LB_ERR || n == 0) {
		    MessageBeep(0);
		    break;
		}
                for (key = first234(rsakeys, &e); key; key = next234(&e))
                    if (n-- == 0)
                        break;
                del234(rsakeys, key);
                freersakey(key); free(key);
                SendDlgItemMessage(hwnd, 100, LB_RESETCONTENT, 0, 0);
                for (key = first234(rsakeys, &e); key; key = next234(&e)) {
                    SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
                                        0, (LPARAM) key->comment);
                }
		SendDlgItemMessage (hwnd, 100, LB_SETCURSEL, (WPARAM) -1, 0);
            }
            return 0;
	}
	return 0;
      case WM_CLOSE:
        keylist = NULL;
        DestroyWindow(hwnd);
	return 0;
    }
    return 0;
}

static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
                                 WPARAM wParam, LPARAM lParam) {
    int ret;
    static int menuinprogress;

    switch (message) {
      case WM_SYSTRAY:
        if (lParam == WM_RBUTTONUP) {
            POINT cursorpos;
            GetCursorPos(&cursorpos);
            PostMessage(hwnd, WM_SYSTRAY2, cursorpos.x, cursorpos.y);
        }
        break;
      case WM_SYSTRAY2:
        if (!menuinprogress) {
            menuinprogress = 1;
            SetForegroundWindow(hwnd);
            ret = TrackPopupMenu(systray_menu,
                                 TPM_RIGHTALIGN | TPM_BOTTOMALIGN |
                                 TPM_RIGHTBUTTON,
                                 wParam, lParam, 0, hwnd, NULL);
            menuinprogress = 0;
        }
        break;
      case WM_COMMAND:
      case WM_SYSCOMMAND:
	switch (wParam & ~0xF) {       /* low 4 bits reserved to Windows */
          case IDM_CLOSE:
            SendMessage(hwnd, WM_CLOSE, 0, 0);
            break;
          case IDM_VIEWKEYS:
            if (!keylist) {
                keylist = CreateDialog (instance, MAKEINTRESOURCE(211),
                                        NULL, KeyListProc);
                ShowWindow (keylist, SW_SHOWNORMAL);
            }
            break;
        }
        break;
      case WM_DESTROY:
	PostQuitMessage (0);
	return 0;
      case WM_COPYDATA:
        {
            COPYDATASTRUCT *cds;
            void *in, *out, *ret;
            int inlen, outlen;
            HANDLE filemap;
            char mapname[64];
            int id;

            cds = (COPYDATASTRUCT *)lParam;
            /*
             * FIXME: use dwData somehow.
             */
            in = cds->lpData;
            inlen = cds->cbData;
            answer_msg(in, inlen, &out, &outlen);
            if (out) {
                id = 0;
                do {
                    sprintf(mapname, "PageantReply%08x", ++id);
		    filemap = CreateFileMapping(INVALID_HANDLE_VALUE,
                                                NULL, PAGE_READWRITE,
						0, outlen+sizeof(int),
                                                mapname);
                } while (filemap == INVALID_HANDLE_VALUE);
                ret = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0,
                                    outlen+sizeof(int));
                if (ret) {
                    *((int *)ret) = outlen;
                    memcpy(((int *)ret)+1, out, outlen);
                    UnmapViewOfFile(ret);
                    return id;
                }
            } else
                return 0;              /* invalid request */
        }
        break;
      case WM_CLOSEMEM:
        /*
         * FIXME!
         */
        break;
    }

    return DefWindowProc (hwnd, message, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
    WNDCLASS wndclass;
    HANDLE mailslot;
    MSG msg;

    instance = inst;

    if (!prev) {
	wndclass.style         = 0;
	wndclass.lpfnWndProc   = WndProc;
	wndclass.cbClsExtra    = 0;
	wndclass.cbWndExtra    = 0;
	wndclass.hInstance     = inst;
	wndclass.hIcon         = LoadIcon (inst,
					   MAKEINTRESOURCE(IDI_MAINICON));
	wndclass.hCursor       = LoadCursor (NULL, IDC_IBEAM);
	wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
	wndclass.lpszMenuName  = NULL;
	wndclass.lpszClassName = APPNAME;

	RegisterClass (&wndclass);
    }

    hwnd = keylist = NULL;

    hwnd = CreateWindow (APPNAME, APPNAME,
                         WS_OVERLAPPEDWINDOW | WS_VSCROLL,
                         CW_USEDEFAULT, CW_USEDEFAULT,
                         100, 100, NULL, NULL, inst, NULL);

    /* Set up a system tray icon */
    {
        BOOL res;
        NOTIFYICONDATA tnid;
        HICON hicon;

#ifdef NIM_SETVERSION
        tnid.uVersion = 0;
        res = Shell_NotifyIcon(NIM_SETVERSION, &tnid);
#endif

        tnid.cbSize = sizeof(NOTIFYICONDATA); 
        tnid.hWnd = hwnd; 
        tnid.uID = 1;                  /* unique within this systray use */
        tnid.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP; 
        tnid.uCallbackMessage = WM_SYSTRAY;
        tnid.hIcon = hicon = LoadIcon (instance, MAKEINTRESOURCE(201));
        strcpy(tnid.szTip, "Pageant (PuTTY authentication agent)");

        res = Shell_NotifyIcon(NIM_ADD, &tnid); 

        if (hicon) 
            DestroyIcon(hicon); 

        systray_menu = CreatePopupMenu();
        AppendMenu (systray_menu, MF_ENABLED, IDM_VIEWKEYS, "View Keys");
        AppendMenu (systray_menu, MF_ENABLED, IDM_CLOSE, "Terminate");
    }

    ShowWindow (hwnd, SW_HIDE);

    /*
     * Create the mailslot.
     */
    {
        SECURITY_ATTRIBUTES sa;
        sa.nLength = sizeof(sa);
        sa.lpSecurityDescriptor = NULL;
        sa.bInheritHandle = TRUE;
        mailslot = CreateMailslot(MAILSLOTNAME, 0, 0, &sa);
    }

    /*
     * Initialise storage for RSA keys.
     */
    rsakeys = newtree234(cmpkeys);

    while (GetMessage(&msg, NULL, 0, 0) == 1) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    /* Clean up the system tray icon */
    {
        NOTIFYICONDATA tnid;

        tnid.cbSize = sizeof(NOTIFYICONDATA); 
        tnid.hWnd = hwnd;
        tnid.uID = 1;

        Shell_NotifyIcon(NIM_DELETE, &tnid); 

        DestroyMenu(systray_menu);
    }

    exit(msg.wParam);
}
Commit	Line	Data
5c58ad2d	1	/*
	2	* Pageant: the PuTTY Authentication Agent.
	3	*/
	4
	5	#include <windows.h>
	6	#include <stdio.h> /* FIXME */
	7	#include "putty.h" /* FIXME */
	8	#include "ssh.h"
	9	#include "tree234.h"
	10
	11	#define IDI_MAINICON 200
	12	#define IDI_TRAYICON 201
	13
	14	#define WM_XUSER (WM_USER + 0x2000)
	15	#define WM_SYSTRAY (WM_XUSER + 6)
	16	#define WM_SYSTRAY2 (WM_XUSER + 7)
	17	#define WM_CLOSEMEM (WM_XUSER + 10)
	18
	19	#define IDM_CLOSE 0x0010
	20	#define IDM_VIEWKEYS 0x0020
	21
	22	#define APPNAME "Pageant"
	23
	24	#define MAILSLOTNAME "\\\\.\\mailslot\\pageant_listener"
	25
	26	#define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
	27	#define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
	28	#define SSH_AGENTC_RSA_CHALLENGE 3
	29	#define SSH_AGENT_RSA_RESPONSE 4
	30	#define SSH_AGENT_FAILURE 5
	31	#define SSH_AGENT_SUCCESS 6
	32	#define SSH_AGENTC_ADD_RSA_IDENTITY 7
	33	#define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
	34
	35	HINSTANCE instance;
	36	HWND hwnd;
	37	HWND keylist;
	38	HMENU systray_menu;
	39
	40	tree234 *rsakeys;
	41
	42	/*
	43	* We need this to link with the RSA code, because rsaencrypt()
	44	* pads its data with random bytes. Since we only use rsadecrypt(),
	45	* which is deterministic, this should never be called.
	46	*
	47	* If it _is_ called, there is a _serious_ problem, because it
	48	* won't generate true random numbers. So we must scream, panic,
	49	* and exit immediately if that should happen.
	50	*/
	51	int random_byte(void) {
	52	MessageBox(hwnd, "Internal Error", APPNAME, MB_OK \| MB_ICONERROR);
	53	exit(0);
	54	}
	55
	56	/*
	57	* This function is needed to link with the DES code. We need not
	58	* have it do anything at all.
	59	*/
	60	void logevent(char *msg) {
	61	}
	62
	63	#define GET_32BIT(cp) \
	64	(((unsigned long)(unsigned char)(cp)[0] << 24) \| \
65	((unsigned long)(unsigned char)(cp)[1] << 16) \| \
66	((unsigned long)(unsigned char)(cp)[2] << 8) \| \
67	((unsigned long)(unsigned char)(cp)[3]))
68
69	#define PUT_32BIT(cp, value) { \
70	(cp)[0] = (unsigned char)((value) >> 24); \
71	(cp)[1] = (unsigned char)((value) >> 16); \
72	(cp)[2] = (unsigned char)((value) >> 8); \
73	(cp)[3] = (unsigned char)(value); }
74
75	#define PASSPHRASE_MAXLEN 512
76
77	/*
78	* Dialog-box function for the passphrase box.
79	*/
80	static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
81	WPARAM wParam, LPARAM lParam) {
82	static char *passphrase;
83
84	switch (msg) {
85	case WM_INITDIALOG:
86	passphrase = (char *)lParam;
87	*passphrase = 0;
88	return 0;
89	case WM_COMMAND:
90	switch (LOWORD(wParam)) {
91	case IDOK:
92	if (*passphrase)
93	EndDialog (hwnd, 1);
94	else
95	MessageBeep (0);
96	return 0;
97	case IDCANCEL:
98	EndDialog (hwnd, 0);
99	return 0;
100	case 102: /* edit box */
101	if (HIWORD(wParam) == EN_CHANGE) {
102	GetDlgItemText (hwnd, 102, passphrase, PASSPHRASE_MAXLEN-1);
103	passphrase[PASSPHRASE_MAXLEN-1] = '\0';
104	}
105	return 0;
106	}
107	return 0;
108	case WM_CLOSE:
109	EndDialog (hwnd, 0);
110	return 0;
111	}
112	return 0;
113	}
114
115	/*
116	* This function loads a key from a file and adds it.
117	*/
118	void add_keyfile(char *filename) {
119	char passphrase[PASSPHRASE_MAXLEN];
120	struct RSAKey *key;
121	int needs_pass;
122	int ret;
123	int attempts;
124
125	needs_pass = rsakey_encrypted(filename);
126	attempts = 0;
127	key = malloc(sizeof(*key));
128	do {
129	if (needs_pass) {
130	int dlgret;
131	dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
132	NULL, PassphraseProc,
133	(LPARAM)passphrase);
134	if (!dlgret) {
135	free(key);
136	return; /* operation cancelled */
137	}
138	} else
139	*passphrase = '\0';
140	ret = loadrsakey(filename, key, passphrase);
141	attempts++;
142	} while (ret == -1);
143	if (ret == 0) {
144	MessageBox(NULL, "Couldn't load public key.", APPNAME,
145	MB_OK \| MB_ICONERROR);
146	free(key);
147	return;
148	}
149	if (add234(rsakeys, key) != key)
150	free(key); /* already present, don't waste RAM */
151	}
152
153	/*
154	* This is the main agent function that answers messages.
155	*/
156	void answer_msg(void in, int inlen, void out, int outlen) {
157	unsigned char *ret;
158	unsigned char *p = in;
159	int type;
160
161	out = NULL; / default `no go' response */
162
163	/*
164	* Basic sanity checks. len >= 5, and len[0:4] holds len-4.
165	*/
166	if (inlen < 5 \|\| GET_32BIT(p) != (unsigned long)(inlen-4))
167	return;
168
169	/*
170	* Get the message type.
171	*/
172	type = p[4];
173
174	p += 5;
175
176	switch (type) {
177	case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
178	/*
179	* Reply with SSH_AGENT_RSA_IDENTITIES_ANSWER.
180	*/
181	{
182	enum234 e;
183	struct RSAKey *key;
184	int len, nkeys;
185
186	/*
187	* Count up the number and length of keys we hold.
188	*/
189	len = nkeys = 0;
190	for (key = first234(rsakeys, &e); key; key = next234(&e)) {
191	nkeys++;
192	len += 4; /* length field */
193	len += ssh1_bignum_length(key->exponent);
194	len += ssh1_bignum_length(key->modulus);
195	len += 4 + strlen(key->comment);
196	}
197
198	/*
199	* Packet header is the obvious five bytes, plus four
200	* bytes for the key count.
201	*/
202	len += 5 + 4;
203	if ((ret = malloc(len)) != NULL) {
204	PUT_32BIT(ret, len-4);
205	ret[4] = SSH_AGENT_RSA_IDENTITIES_ANSWER;
206	PUT_32BIT(ret+5, nkeys);
207	p = ret + 5 + 4;
208	for (key = first234(rsakeys, &e); key; key = next234(&e)) {
209	PUT_32BIT(p, ssh1_bignum_bitcount(key->modulus));
210	p += 4;
211	p += ssh1_write_bignum(p, key->exponent);
212	p += ssh1_write_bignum(p, key->modulus);
213	PUT_32BIT(p, strlen(key->comment));
214	memcpy(p+4, key->comment, strlen(key->comment));
215	p += 4 + strlen(key->comment);
216	}
217	}
218	}
219	break;
220	case SSH_AGENTC_RSA_CHALLENGE:
221	/*
222	* Reply with either SSH_AGENT_RSA_RESPONSE or
223	* SSH_AGENT_FAILURE, depending on whether we have that key
224	* or not.
225	*/
226	{
227	struct RSAKey reqkey, *key;
228	Bignum challenge, response;
229	unsigned char response_source[48], response_md5[16];
230	struct MD5Context md5c;
231	int i, len;
232
233	p += 4;
234	p += ssh1_read_bignum(p, &reqkey.exponent);
235	p += ssh1_read_bignum(p, &reqkey.modulus);
236	p += ssh1_read_bignum(p, &challenge);
237	memcpy(response_source+32, p, 16); p += 16;
238	if (GET_32BIT(p) != 1 \|\|
239	(key = find234(rsakeys, &reqkey, NULL)) == NULL) {
240	freebn(reqkey.exponent);
241	freebn(reqkey.modulus);
242	freebn(challenge);
243	goto failure;
244	}
245	response = rsadecrypt(challenge, key);
246	for (i = 0; i < 32; i++)
247	response_source[i] = bignum_byte(response, 31-i);
248
249	MD5Init(&md5c);
250	MD5Update(&md5c, response_source, 48);
251	MD5Final(response_md5, &md5c);
252	memset(response_source, 0, 48); /* burn the evidence */
253	freebn(response); /* and that evidence */
254	freebn(challenge); /* yes, and that evidence */
255	freebn(reqkey.exponent); /* and free some memory ... */
256	freebn(reqkey.modulus); /* ... while we're at it. */
257
258	/*
259	* Packet is the obvious five byte header, plus sixteen
260	* bytes of MD5.
261	*/
262	len = 5 + 16;
263	if ((ret = malloc(len)) != NULL) {
264	PUT_32BIT(ret, len-4);
265	ret[4] = SSH_AGENT_RSA_RESPONSE;
266	memcpy(ret+5, response_md5, 16);
267	}
268	}
269	break;
270	#if 0 /* FIXME: implement these */
271	case SSH_AGENTC_ADD_RSA_IDENTITY:
272	/*
273	* Add to the list and return SSH_AGENT_SUCCESS, or
274	* SSH_AGENT_FAILURE if the key was malformed.
275	*/
276	break;
277	case SSH_AGENTC_REMOVE_RSA_IDENTITY:
278	/*
279	* Remove from the list and return SSH_AGENT_SUCCESS, or
280	* perhaps SSH_AGENT_FAILURE if it wasn't in the list to
281	* start with.
282	*/
283	break;
284	#endif
285	default:
286	failure:
287	/*
288	* Unrecognised message. Return SSH_AGENT_FAILURE.
289	*/
290	if ((ret = malloc(5)) != NULL) {
291	PUT_32BIT(ret, 1);
292	ret[4] = SSH_AGENT_FAILURE;
293	}
294	break;
295	}
296
297	if (ret) {
298	*out = ret;
299	*outlen = 4 + GET_32BIT(ret);
300	}
301	}
302
303	/*
304	* Key comparison function for the 2-3-4 tree of RSA keys.
305	*/
306	int cmpkeys(void av, void bv) {
307	struct RSAKey a = (struct RSAKey )av;
308	struct RSAKey b = (struct RSAKey )bv;
309	Bignum am, bm;
310	int alen, blen;
311
312	am = a->modulus;
313	bm = b->modulus;
314	/*
315	* Compare by length of moduli.
316	*/
317	alen = ssh1_bignum_bitcount(am);
318	blen = ssh1_bignum_bitcount(bm);
319	if (alen > blen) return +1; else if (alen < blen) return -1;
320	/*
321	* Now compare by moduli themselves.
322	*/
323	alen = (alen + 7) / 8; /* byte count */
324	while (alen-- > 0) {
325	int abyte, bbyte;
326	abyte = bignum_byte(am, alen);
327	bbyte = bignum_byte(bm, alen);
328	if (abyte > bbyte) return +1; else if (abyte < bbyte) return -1;
329	}
330	/*
331	* Give up.
332	*/
333	return 0;
334	}
335
336	static void error(char *s) {
337	MessageBox(hwnd, s, APPNAME, MB_OK \| MB_ICONERROR);
338	}
339
340	/*
341	* Dialog-box function for the key list box.
342	*/
343	static int CALLBACK KeyListProc(HWND hwnd, UINT msg,
344	WPARAM wParam, LPARAM lParam) {
345	enum234 e;
346	struct RSAKey *key;
347	OPENFILENAME of;
348	char filename[FILENAME_MAX];
349
350	switch (msg) {
351	case WM_INITDIALOG:
352	for (key = first234(rsakeys, &e); key; key = next234(&e)) {
353	SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
354	0, (LPARAM) key->comment);
355	}
356	return 0;
357	case WM_COMMAND:
358	switch (LOWORD(wParam)) {
359	case IDOK:
360	case IDCANCEL:
361	keylist = NULL;
362	DestroyWindow(hwnd);
363	return 0;
364	case 101: /* add key */
365	if (HIWORD(wParam) == BN_CLICKED \|\|
366	HIWORD(wParam) == BN_DOUBLECLICKED) {
367	memset(&of, 0, sizeof(of));
368	#ifdef OPENFILENAME_SIZE_VERSION_400
369	of.lStructSize = OPENFILENAME_SIZE_VERSION_400;
370	#else
371	of.lStructSize = sizeof(of);
372	#endif
373	of.hwndOwner = hwnd;
374	of.lpstrFilter = "All Files\0*\0\0\0";
375	of.lpstrCustomFilter = NULL;
376	of.nFilterIndex = 1;
377	of.lpstrFile = filename; *filename = '\0';
378	of.nMaxFile = sizeof(filename);
379	of.lpstrFileTitle = NULL;
380	of.lpstrInitialDir = NULL;
381	of.lpstrTitle = "Select Public Key File";
382	of.Flags = 0;
383	if (GetOpenFileName(&of)) {
384	add_keyfile(filename);
385	}
386	SendDlgItemMessage(hwnd, 100, LB_RESETCONTENT, 0, 0);
387	for (key = first234(rsakeys, &e); key; key = next234(&e)) {
388	SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
389	0, (LPARAM) key->comment);
390	}
391	SendDlgItemMessage (hwnd, 100, LB_SETCURSEL, (WPARAM) -1, 0);
392	}
393	return 0;
394	case 102: /* remove key */
395	if (HIWORD(wParam) == BN_CLICKED \|\|
396	HIWORD(wParam) == BN_DOUBLECLICKED) {
397	int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
398	if (n == LB_ERR \|\| n == 0) {
399	MessageBeep(0);
400	break;
401	}
402	for (key = first234(rsakeys, &e); key; key = next234(&e))
403	if (n-- == 0)
404	break;
405	del234(rsakeys, key);
406	freersakey(key); free(key);
407	SendDlgItemMessage(hwnd, 100, LB_RESETCONTENT, 0, 0);
408	for (key = first234(rsakeys, &e); key; key = next234(&e)) {
409	SendDlgItemMessage (hwnd, 100, LB_ADDSTRING,
410	0, (LPARAM) key->comment);
411	}
412	SendDlgItemMessage (hwnd, 100, LB_SETCURSEL, (WPARAM) -1, 0);
413	}
414	return 0;
415	}
416	return 0;
417	case WM_CLOSE:
418	keylist = NULL;
419	DestroyWindow(hwnd);
420	return 0;
421	}
422	return 0;
423	}
424
425	static LRESULT CALLBACK WndProc (HWND hwnd, UINT message,
426	WPARAM wParam, LPARAM lParam) {
427	int ret;
428	static int menuinprogress;
429
430	switch (message) {
431	case WM_SYSTRAY:
432	if (lParam == WM_RBUTTONUP) {
433	POINT cursorpos;
434	GetCursorPos(&cursorpos);
435	PostMessage(hwnd, WM_SYSTRAY2, cursorpos.x, cursorpos.y);
436	}
437	break;
438	case WM_SYSTRAY2:
439	if (!menuinprogress) {
440	menuinprogress = 1;
441	SetForegroundWindow(hwnd);
442	ret = TrackPopupMenu(systray_menu,
443	TPM_RIGHTALIGN \| TPM_BOTTOMALIGN \|
444	TPM_RIGHTBUTTON,
445	wParam, lParam, 0, hwnd, NULL);
446	menuinprogress = 0;
447	}
448	break;
449	case WM_COMMAND:
450	case WM_SYSCOMMAND:
451	switch (wParam & ~0xF) { /* low 4 bits reserved to Windows */
452	case IDM_CLOSE:
453	SendMessage(hwnd, WM_CLOSE, 0, 0);
454	break;
455	case IDM_VIEWKEYS:
456	if (!keylist) {
457	keylist = CreateDialog (instance, MAKEINTRESOURCE(211),
458	NULL, KeyListProc);
459	ShowWindow (keylist, SW_SHOWNORMAL);
460	}
461	break;
462	}
463	break;
464	case WM_DESTROY:
465	PostQuitMessage (0);
466	return 0;
467	case WM_COPYDATA:
468	{
469	COPYDATASTRUCT *cds;
470	void in, out, *ret;
471	int inlen, outlen;
472	HANDLE filemap;
473	char mapname[64];
474	int id;
475
476	cds = (COPYDATASTRUCT *)lParam;
477	/*
478	* FIXME: use dwData somehow.
479	*/
480	in = cds->lpData;
481	inlen = cds->cbData;
482	answer_msg(in, inlen, &out, &outlen);
483	if (out) {
484	id = 0;
485	do {
486	sprintf(mapname, "PageantReply%08x", ++id);
487	filemap = CreateFileMapping(INVALID_HANDLE_VALUE,
488	NULL, PAGE_READWRITE,
489	0, outlen+sizeof(int),
490	mapname);
491	} while (filemap == INVALID_HANDLE_VALUE);
492	ret = MapViewOfFile(filemap, FILE_MAP_WRITE, 0, 0,
493	outlen+sizeof(int));
494	if (ret) {
495	((int )ret) = outlen;
496	memcpy(((int *)ret)+1, out, outlen);
497	UnmapViewOfFile(ret);
498	return id;
499	}
500	} else
501	return 0; /* invalid request */
502	}
503	break;
504	case WM_CLOSEMEM:
505	/*
506	* FIXME!
507	*/
508	break;
509	}
510
511	return DefWindowProc (hwnd, message, wParam, lParam);
512	}
513
514	int WINAPI WinMain(HINSTANCE inst, HINSTANCE prev, LPSTR cmdline, int show) {
515	WNDCLASS wndclass;
516	HANDLE mailslot;
517	MSG msg;
518
519	instance = inst;
520
521	if (!prev) {
522	wndclass.style = 0;
523	wndclass.lpfnWndProc = WndProc;
524	wndclass.cbClsExtra = 0;
525	wndclass.cbWndExtra = 0;
526	wndclass.hInstance = inst;
527	wndclass.hIcon = LoadIcon (inst,
528	MAKEINTRESOURCE(IDI_MAINICON));
529	wndclass.hCursor = LoadCursor (NULL, IDC_IBEAM);
530	wndclass.hbrBackground = GetStockObject (BLACK_BRUSH);
531	wndclass.lpszMenuName = NULL;
532	wndclass.lpszClassName = APPNAME;
533
534	RegisterClass (&wndclass);
535	}
536
537	hwnd = keylist = NULL;
538
539	hwnd = CreateWindow (APPNAME, APPNAME,
540	WS_OVERLAPPEDWINDOW \| WS_VSCROLL,
541	CW_USEDEFAULT, CW_USEDEFAULT,
542	100, 100, NULL, NULL, inst, NULL);
543
544	/* Set up a system tray icon */
545	{
546	BOOL res;
547	NOTIFYICONDATA tnid;
548	HICON hicon;
549
550	#ifdef NIM_SETVERSION
551	tnid.uVersion = 0;
552	res = Shell_NotifyIcon(NIM_SETVERSION, &tnid);
553	#endif
554
555	tnid.cbSize = sizeof(NOTIFYICONDATA);
556	tnid.hWnd = hwnd;
557	tnid.uID = 1; /* unique within this systray use */
558	tnid.uFlags = NIF_MESSAGE \| NIF_ICON \| NIF_TIP;
559	tnid.uCallbackMessage = WM_SYSTRAY;
560	tnid.hIcon = hicon = LoadIcon (instance, MAKEINTRESOURCE(201));
561	strcpy(tnid.szTip, "Pageant (PuTTY authentication agent)");
562
563	res = Shell_NotifyIcon(NIM_ADD, &tnid);
564
565	if (hicon)
566	DestroyIcon(hicon);
567
568	systray_menu = CreatePopupMenu();
569	AppendMenu (systray_menu, MF_ENABLED, IDM_VIEWKEYS, "View Keys");
570	AppendMenu (systray_menu, MF_ENABLED, IDM_CLOSE, "Terminate");
571	}
572
573	ShowWindow (hwnd, SW_HIDE);
574
575	/*
576	* Create the mailslot.
577	*/
578	{
579	SECURITY_ATTRIBUTES sa;
580	sa.nLength = sizeof(sa);
581	sa.lpSecurityDescriptor = NULL;
582	sa.bInheritHandle = TRUE;
583	mailslot = CreateMailslot(MAILSLOTNAME, 0, 0, &sa);
584	}
585
586	/*
587	* Initialise storage for RSA keys.
588	*/
589	rsakeys = newtree234(cmpkeys);
590
591	while (GetMessage(&msg, NULL, 0, 0) == 1) {
592	TranslateMessage(&msg);
593	DispatchMessage(&msg);
594	}
595
596	/* Clean up the system tray icon */
597	{
598	NOTIFYICONDATA tnid;
599
600	tnid.cbSize = sizeof(NOTIFYICONDATA);
601	tnid.hWnd = hwnd;
602	tnid.uID = 1;
603
604	Shell_NotifyIcon(NIM_DELETE, &tnid);
605
606	DestroyMenu(systray_menu);
607	}
608
609	exit(msg.wParam);
610	}