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pageant.c
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pageant.c
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/*
* Pageant: the PuTTY Authentication Agent.
*/
#include <windows.h>
#ifndef NO_SECURITY
#include <aclapi.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <tchar.h>
#include "putty.h"
#include "ssh.h"
#include "misc.h"
#include "tree234.h"
#include "winstuff.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 AGENT_COPYDATA_ID 0x804e50ba /* random goop */
/*
* FIXME: maybe some day we can sort this out ...
*/
#define AGENT_MAX_MSGLEN 8192
#define IDM_CLOSE 0x0010
#define IDM_VIEWKEYS 0x0020
#define IDM_ADDKEY 0x0030
#define IDM_HELP 0x0040
#define IDM_ABOUT 0x0050
#define APPNAME "Pageant"
extern char ver[];
static HINSTANCE instance;
static HWND main_hwnd;
static HWND keylist;
static HWND aboutbox;
static HMENU systray_menu, session_menu;
static int already_running;
static int requested_help;
static char *help_path;
static char *putty_path;
#define IDM_PUTTY 0x0060
#define IDM_SESSIONS_BASE 0x1000
#define IDM_SESSIONS_MAX 0x2000
#define PUTTY_REGKEY "Software\\SimonTatham\\PuTTY\\Sessions"
#define PUTTY_DEFAULT "Default%20Settings"
static int initial_menuitems_count;
/*
* Print a modal (Really Bad) message box and perform a fatal exit.
*/
void modalfatalbox(char *fmt, ...)
{
va_list ap;
char *buf;
va_start(ap, fmt);
buf = dupvprintf(fmt, ap);
va_end(ap);
MessageBox(main_hwnd, buf, "Pageant Fatal Error",
MB_SYSTEMMODAL | MB_ICONERROR | MB_OK);
sfree(buf);
exit(1);
}
/* Un-munge session names out of the registry. */
static void unmungestr(char *in, char *out, int outlen)
{
while (*in) {
if (*in == '%' && in[1] && in[2]) {
int i, j;
i = in[1] - '0';
i -= (i > 9 ? 7 : 0);
j = in[2] - '0';
j -= (j > 9 ? 7 : 0);
*out++ = (i << 4) + j;
if (!--outlen)
return;
in += 3;
} else {
*out++ = *in++;
if (!--outlen)
return;
}
}
*out = '\0';
return;
}
static tree234 *rsakeys, *ssh2keys;
static int has_security;
#ifndef NO_SECURITY
typedef DWORD(WINAPI * gsi_fn_t)
(HANDLE, SE_OBJECT_TYPE, SECURITY_INFORMATION,
PSID *, PSID *, PACL *, PACL *, PSECURITY_DESCRIPTOR *);
static gsi_fn_t getsecurityinfo;
#endif
/*
* Exports from pageantc.c
*/
void agent_query(void *in, int inlen, void **out, int *outlen);
int agent_exists(void);
/*
* Forward references
*/
static void *make_keylist1(int *length);
static void *make_keylist2(int *length);
static void *get_keylist1(void);
static void *get_keylist2(void);
/*
* Blob structure for passing to the asymmetric SSH2 key compare
* function, prototyped here.
*/
struct blob {
unsigned char *blob;
int len;
};
static int cmpkeys_ssh2_asymm(void *av, void *bv);
#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
struct PassphraseProcStruct {
char *passphrase;
char *comment;
};
static tree234 *passphrases = NULL;
/*
* After processing a list of filenames, we want to forget the
* passphrases.
*/
static void forget_passphrases(void)
{
while (count234(passphrases) > 0) {
char *pp = index234(passphrases, 0);
memset(pp, 0, strlen(pp));
delpos234(passphrases, 0);
free(pp);
}
}
/*
* Dialog-box function for the Licence box.
*/
static int CALLBACK LicenceProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam)
{
switch (msg) {
case WM_INITDIALOG:
return 1;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
EndDialog(hwnd, 1);
return 0;
}
return 0;
case WM_CLOSE:
EndDialog(hwnd, 1);
return 0;
}
return 0;
}
/*
* Dialog-box function for the About box.
*/
static int CALLBACK AboutProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam)
{
switch (msg) {
case WM_INITDIALOG:
SetDlgItemText(hwnd, 100, ver);
return 1;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
aboutbox = NULL;
DestroyWindow(hwnd);
return 0;
case 101:
EnableWindow(hwnd, 0);
DialogBox(instance, MAKEINTRESOURCE(214), hwnd, LicenceProc);
EnableWindow(hwnd, 1);
SetActiveWindow(hwnd);
return 0;
}
return 0;
case WM_CLOSE:
aboutbox = NULL;
DestroyWindow(hwnd);
return 0;
}
return 0;
}
static HWND passphrase_box;
/*
* Dialog-box function for the passphrase box.
*/
static int CALLBACK PassphraseProc(HWND hwnd, UINT msg,
WPARAM wParam, LPARAM lParam)
{
static char *passphrase = NULL;
struct PassphraseProcStruct *p;
switch (msg) {
case WM_INITDIALOG:
passphrase_box = hwnd;
/*
* Centre the window.
*/
{ /* centre the window */
RECT rs, rd;
HWND hw;
hw = GetDesktopWindow();
if (GetWindowRect(hw, &rs) && GetWindowRect(hwnd, &rd))
MoveWindow(hwnd,
(rs.right + rs.left + rd.left - rd.right) / 2,
(rs.bottom + rs.top + rd.top - rd.bottom) / 2,
rd.right - rd.left, rd.bottom - rd.top, TRUE);
}
SetForegroundWindow(hwnd);
SetWindowPos(hwnd, HWND_TOP, 0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
p = (struct PassphraseProcStruct *) lParam;
passphrase = p->passphrase;
if (p->comment)
SetDlgItemText(hwnd, 101, p->comment);
*passphrase = 0;
SetDlgItemText(hwnd, 102, passphrase);
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) && passphrase) {
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;
}
/*
* Warn about the obsolescent key file format.
*/
void old_keyfile_warning(void)
{
static const char mbtitle[] = "PuTTY Key File Warning";
static const char message[] =
"You are loading an SSH 2 private key which has an\n"
"old version of the file format. This means your key\n"
"file is not fully tamperproof. Future versions of\n"
"PuTTY may stop supporting this private key format,\n"
"so we recommend you convert your key to the new\n"
"format.\n"
"\n"
"You can perform this conversion by loading the key\n"
"into PuTTYgen and then saving it again.";
MessageBox(NULL, message, mbtitle, MB_OK);
}
/*
* Update the visible key list.
*/
static void keylist_update(void)
{
struct RSAKey *rkey;
struct ssh2_userkey *skey;
int i;
if (keylist) {
SendDlgItemMessage(keylist, 100, LB_RESETCONTENT, 0, 0);
for (i = 0; NULL != (rkey = index234(rsakeys, i)); i++) {
char listentry[512], *p;
/*
* Replace two spaces in the fingerprint with tabs, for
* nice alignment in the box.
*/
strcpy(listentry, "ssh1\t");
p = listentry + strlen(listentry);
rsa_fingerprint(p, sizeof(listentry) - (p - listentry), rkey);
p = strchr(listentry, ' ');
if (p)
*p = '\t';
p = strchr(listentry, ' ');
if (p)
*p = '\t';
SendDlgItemMessage(keylist, 100, LB_ADDSTRING,
0, (LPARAM) listentry);
}
for (i = 0; NULL != (skey = index234(ssh2keys, i)); i++) {
char listentry[512], *p;
int len;
/*
* Replace two spaces in the fingerprint with tabs, for
* nice alignment in the box.
*/
p = skey->alg->fingerprint(skey->data);
strncpy(listentry, p, sizeof(listentry));
p = strchr(listentry, ' ');
if (p)
*p = '\t';
p = strchr(listentry, ' ');
if (p)
*p = '\t';
len = strlen(listentry);
if (len < sizeof(listentry) - 2) {
listentry[len] = '\t';
strncpy(listentry + len + 1, skey->comment,
sizeof(listentry) - len - 1);
}
SendDlgItemMessage(keylist, 100, LB_ADDSTRING, 0,
(LPARAM) listentry);
}
SendDlgItemMessage(keylist, 100, LB_SETCURSEL, (WPARAM) - 1, 0);
}
}
/*
* This function loads a key from a file and adds it.
*/
static void add_keyfile(Filename filename)
{
char passphrase[PASSPHRASE_MAXLEN];
struct RSAKey *rkey = NULL;
struct ssh2_userkey *skey = NULL;
int needs_pass;
int ret;
int attempts;
char *comment;
struct PassphraseProcStruct pps;
int type;
int original_pass;
type = key_type(&filename);
if (type != SSH_KEYTYPE_SSH1 && type != SSH_KEYTYPE_SSH2) {
char msg[256];
sprintf(msg, "Couldn't load this key (%s)", key_type_to_str(type));
MessageBox(NULL, msg, APPNAME, MB_OK | MB_ICONERROR);
return;
}
/*
* See if the key is already loaded (in the primary Pageant,
* which may or may not be us).
*/
{
void *blob;
unsigned char *keylist, *p;
int i, nkeys, bloblen;
if (type == SSH_KEYTYPE_SSH1) {
if (!rsakey_pubblob(&filename, &blob, &bloblen)) {
MessageBox(NULL, "Couldn't load private key.", APPNAME,
MB_OK | MB_ICONERROR);
return;
}
keylist = get_keylist1();
} else {
unsigned char *blob2;
blob = ssh2_userkey_loadpub(&filename, NULL, &bloblen);
if (!blob) {
MessageBox(NULL, "Couldn't load private key.", APPNAME,
MB_OK | MB_ICONERROR);
return;
}
/* For our purposes we want the blob prefixed with its length */
blob2 = smalloc(bloblen+4);
PUT_32BIT(blob2, bloblen);
memcpy(blob2 + 4, blob, bloblen);
sfree(blob);
blob = blob2;
keylist = get_keylist2();
}
if (keylist) {
nkeys = GET_32BIT(keylist);
p = keylist + 4;
for (i = 0; i < nkeys; i++) {
if (!memcmp(blob, p, bloblen)) {
/* Key is already present; we can now leave. */
sfree(keylist);
sfree(blob);
return;
}
/* Now skip over public blob */
if (type == SSH_KEYTYPE_SSH1)
p += rsa_public_blob_len(p);
else
p += 4 + GET_32BIT(p);
/* Now skip over comment field */
p += 4 + GET_32BIT(p);
}
sfree(keylist);
}
sfree(blob);
}
if (type == SSH_KEYTYPE_SSH1)
needs_pass = rsakey_encrypted(&filename, &comment);
else
needs_pass = ssh2_userkey_encrypted(&filename, &comment);
attempts = 0;
if (type == SSH_KEYTYPE_SSH1)
rkey = smalloc(sizeof(*rkey));
pps.passphrase = passphrase;
pps.comment = comment;
original_pass = 0;
do {
if (needs_pass) {
/* try all the remembered passphrases first */
char *pp = index234(passphrases, attempts);
if(pp) {
strcpy(passphrase, pp);
} else {
int dlgret;
original_pass = 1;
dlgret = DialogBoxParam(instance, MAKEINTRESOURCE(210),
NULL, PassphraseProc, (LPARAM) & pps);
passphrase_box = NULL;
if (!dlgret) {
if (comment)
sfree(comment);
if (type == SSH_KEYTYPE_SSH1)
sfree(rkey);
return; /* operation cancelled */
}
}
} else
*passphrase = '\0';
if (type == SSH_KEYTYPE_SSH1)
ret = loadrsakey(&filename, rkey, passphrase);
else {
skey = ssh2_load_userkey(&filename, passphrase);
if (skey == SSH2_WRONG_PASSPHRASE)
ret = -1;
else if (!skey)
ret = 0;
else
ret = 1;
}
attempts++;
} while (ret == -1);
/* if they typed in an ok passphrase, remember it */
if(original_pass && ret) {
char *pp = dupstr(passphrase);
addpos234(passphrases, pp, 0);
}
if (comment)
sfree(comment);
if (ret == 0) {
MessageBox(NULL, "Couldn't load private key.", APPNAME,
MB_OK | MB_ICONERROR);
if (type == SSH_KEYTYPE_SSH1)
sfree(rkey);
return;
}
if (type == SSH_KEYTYPE_SSH1) {
if (already_running) {
unsigned char *request, *response;
void *vresponse;
int reqlen, clen, resplen;
clen = strlen(rkey->comment);
reqlen = 4 + 1 + /* length, message type */
4 + /* bit count */
ssh1_bignum_length(rkey->modulus) +
ssh1_bignum_length(rkey->exponent) +
ssh1_bignum_length(rkey->private_exponent) +
ssh1_bignum_length(rkey->iqmp) +
ssh1_bignum_length(rkey->p) +
ssh1_bignum_length(rkey->q) + 4 + clen /* comment */
;
request = smalloc(reqlen);
request[4] = SSH1_AGENTC_ADD_RSA_IDENTITY;
reqlen = 5;
PUT_32BIT(request + reqlen, bignum_bitcount(rkey->modulus));
reqlen += 4;
reqlen += ssh1_write_bignum(request + reqlen, rkey->modulus);
reqlen += ssh1_write_bignum(request + reqlen, rkey->exponent);
reqlen +=
ssh1_write_bignum(request + reqlen,
rkey->private_exponent);
reqlen += ssh1_write_bignum(request + reqlen, rkey->iqmp);
reqlen += ssh1_write_bignum(request + reqlen, rkey->p);
reqlen += ssh1_write_bignum(request + reqlen, rkey->q);
PUT_32BIT(request + reqlen, clen);
memcpy(request + reqlen + 4, rkey->comment, clen);
reqlen += 4 + clen;
PUT_32BIT(request, reqlen - 4);
agent_query(request, reqlen, &vresponse, &resplen);
response = vresponse;
if (resplen < 5 || response[4] != SSH_AGENT_SUCCESS)
MessageBox(NULL, "The already running Pageant "
"refused to add the key.", APPNAME,
MB_OK | MB_ICONERROR);
sfree(request);
sfree(response);
} else {
if (add234(rsakeys, rkey) != rkey)
sfree(rkey); /* already present, don't waste RAM */
}
} else {
if (already_running) {
unsigned char *request, *response;
void *vresponse;
int reqlen, alglen, clen, keybloblen, resplen;
alglen = strlen(skey->alg->name);
clen = strlen(skey->comment);
keybloblen = skey->alg->openssh_fmtkey(skey->data, NULL, 0);
reqlen = 4 + 1 + /* length, message type */
4 + alglen + /* algorithm name */
keybloblen + /* key data */
4 + clen /* comment */
;
request = smalloc(reqlen);
request[4] = SSH2_AGENTC_ADD_IDENTITY;
reqlen = 5;
PUT_32BIT(request + reqlen, alglen);
reqlen += 4;
memcpy(request + reqlen, skey->alg->name, alglen);
reqlen += alglen;
reqlen += skey->alg->openssh_fmtkey(skey->data,
request + reqlen,
keybloblen);
PUT_32BIT(request + reqlen, clen);
memcpy(request + reqlen + 4, skey->comment, clen);
PUT_32BIT(request, reqlen - 4);
reqlen += clen + 4;
agent_query(request, reqlen, &vresponse, &resplen);
response = vresponse;
if (resplen < 5 || response[4] != SSH_AGENT_SUCCESS)
MessageBox(NULL, "The already running Pageant "
"refused to add the key.", APPNAME,
MB_OK | MB_ICONERROR);
sfree(request);
sfree(response);
} else {
if (add234(ssh2keys, skey) != skey) {
skey->alg->freekey(skey->data);
sfree(skey); /* already present, don't waste RAM */
}
}
}
}
/*
* Create an SSH1 key list in a malloc'ed buffer; return its
* length.
*/
static void *make_keylist1(int *length)
{
int i, nkeys, len;
struct RSAKey *key;
unsigned char *blob, *p, *ret;
int bloblen;
/*
* Count up the number and length of keys we hold.
*/
len = 4;
nkeys = 0;
for (i = 0; NULL != (key = index234(rsakeys, i)); i++) {
nkeys++;
blob = rsa_public_blob(key, &bloblen);
len += bloblen;
sfree(blob);
len += 4 + strlen(key->comment);
}
/* Allocate the buffer. */
p = ret = smalloc(len);
if (length) *length = len;
PUT_32BIT(p, nkeys);
p += 4;
for (i = 0; NULL != (key = index234(rsakeys, i)); i++) {
blob = rsa_public_blob(key, &bloblen);
memcpy(p, blob, bloblen);
p += bloblen;
sfree(blob);
PUT_32BIT(p, strlen(key->comment));
memcpy(p + 4, key->comment, strlen(key->comment));
p += 4 + strlen(key->comment);
}
assert(p - ret == len);
return ret;
}
/*
* Create an SSH2 key list in a malloc'ed buffer; return its
* length.
*/
static void *make_keylist2(int *length)
{
struct ssh2_userkey *key;
int i, len, nkeys;
unsigned char *blob, *p, *ret;
int bloblen;
/*
* Count up the number and length of keys we hold.
*/
len = 4;
nkeys = 0;
for (i = 0; NULL != (key = index234(ssh2keys, i)); i++) {
nkeys++;
len += 4; /* length field */
blob = key->alg->public_blob(key->data, &bloblen);
len += bloblen;
sfree(blob);
len += 4 + strlen(key->comment);
}
/* Allocate the buffer. */
p = ret = smalloc(len);
if (length) *length = len;
/*
* Packet header is the obvious five bytes, plus four
* bytes for the key count.
*/
PUT_32BIT(p, nkeys);
p += 4;
for (i = 0; NULL != (key = index234(ssh2keys, i)); i++) {
blob = key->alg->public_blob(key->data, &bloblen);
PUT_32BIT(p, bloblen);
p += 4;
memcpy(p, blob, bloblen);
p += bloblen;
sfree(blob);
PUT_32BIT(p, strlen(key->comment));
memcpy(p + 4, key->comment, strlen(key->comment));
p += 4 + strlen(key->comment);
}
assert(p - ret == len);
return ret;
}
/*
* Acquire a keylist1 from the primary Pageant; this means either
* calling make_keylist1 (if that's us) or sending a message to the
* primary Pageant (if it's not).
*/
static void *get_keylist1(void)
{
void *ret;
if (already_running) {
unsigned char request[5], *response;
void *vresponse;
int resplen;
request[4] = SSH1_AGENTC_REQUEST_RSA_IDENTITIES;
PUT_32BIT(request, 4);
agent_query(request, 5, &vresponse, &resplen);
response = vresponse;
if (resplen < 5 || response[4] != SSH1_AGENT_RSA_IDENTITIES_ANSWER)
return NULL;
ret = smalloc(resplen-5);
memcpy(ret, response+5, resplen-5);
sfree(response);
} else {
ret = make_keylist1(NULL);
}
return ret;
}
/*
* Acquire a keylist2 from the primary Pageant; this means either
* calling make_keylist2 (if that's us) or sending a message to the
* primary Pageant (if it's not).
*/
static void *get_keylist2(void)
{
void *ret;
if (already_running) {
unsigned char request[5], *response;
void *vresponse;
int resplen;
request[4] = SSH2_AGENTC_REQUEST_IDENTITIES;
PUT_32BIT(request, 4);
agent_query(request, 5, &vresponse, &resplen);
response = vresponse;
if (resplen < 5 || response[4] != SSH2_AGENT_IDENTITIES_ANSWER)
return NULL;
ret = smalloc(resplen-5);
memcpy(ret, response+5, resplen-5);
sfree(response);
} else {
ret = make_keylist2(NULL);
}
return ret;
}
/*
* This is the main agent function that answers messages.
*/
static void answer_msg(void *msg)
{
unsigned char *p = msg;
unsigned char *ret = msg;
int type;
/*
* Get the message type.
*/
type = p[4];
p += 5;
switch (type) {
case SSH1_AGENTC_REQUEST_RSA_IDENTITIES:
/*
* Reply with SSH1_AGENT_RSA_IDENTITIES_ANSWER.
*/
{
int len;
void *keylist;
ret[4] = SSH1_AGENT_RSA_IDENTITIES_ANSWER;
keylist = make_keylist1(&len);
if (len + 5 > AGENT_MAX_MSGLEN) {
sfree(keylist);
goto failure;
}
PUT_32BIT(ret, len + 1);
memcpy(ret + 5, keylist, len);
sfree(keylist);
}
break;
case SSH2_AGENTC_REQUEST_IDENTITIES:
/*
* Reply with SSH2_AGENT_IDENTITIES_ANSWER.
*/
{
int len;
void *keylist;
ret[4] = SSH2_AGENT_IDENTITIES_ANSWER;
keylist = make_keylist2(&len);
if (len + 5 > AGENT_MAX_MSGLEN) {
sfree(keylist);
goto failure;
}
PUT_32BIT(ret, len + 1);
memcpy(ret + 5, keylist, len);
sfree(keylist);
}
break;
case SSH1_AGENTC_RSA_CHALLENGE:
/*
* Reply with either SSH1_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;
PUT_32BIT(ret, len - 4);
ret[4] = SSH1_AGENT_RSA_RESPONSE;
memcpy(ret + 5, response_md5, 16);
}
break;
case SSH2_AGENTC_SIGN_REQUEST:
/*
* Reply with either SSH2_AGENT_SIGN_RESPONSE or
* SSH_AGENT_FAILURE, depending on whether we have that key
* or not.
*/
{
struct ssh2_userkey *key;
struct blob b;
unsigned char *data, *signature;
int datalen, siglen, len;
b.len = GET_32BIT(p);
p += 4;
b.blob = p;
p += b.len;
datalen = GET_32BIT(p);
p += 4;
data = p;
key = find234(ssh2keys, &b, cmpkeys_ssh2_asymm);
if (!key)
goto failure;
signature = key->alg->sign(key->data, data, datalen, &siglen);
len = 5 + 4 + siglen;
PUT_32BIT(ret, len - 4);
ret[4] = SSH2_AGENT_SIGN_RESPONSE;
PUT_32BIT(ret + 5, siglen);
memcpy(ret + 5 + 4, signature, siglen);
sfree(signature);
}
break;
case SSH1_AGENTC_ADD_RSA_IDENTITY:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
{
struct RSAKey *key;
char *comment;
int commentlen;
key = smalloc(sizeof(struct RSAKey));
memset(key, 0, sizeof(struct RSAKey));
p += makekey(p, key, NULL, 1);
p += makeprivate(p, key);
p += ssh1_read_bignum(p, &key->iqmp); /* p^-1 mod q */
p += ssh1_read_bignum(p, &key->p); /* p */
p += ssh1_read_bignum(p, &key->q); /* q */
commentlen = GET_32BIT(p);
comment = smalloc(commentlen+1);
if (comment) {
memcpy(comment, p + 4, commentlen);
comment[commentlen] = '\0';
key->comment = comment;
}
PUT_32BIT(ret, 1);
ret[4] = SSH_AGENT_FAILURE;
if (add234(rsakeys, key) == key) {
keylist_update();
ret[4] = SSH_AGENT_SUCCESS;
} else {
freersakey(key);
sfree(key);
}
}
break;
case SSH2_AGENTC_ADD_IDENTITY:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
{
struct ssh2_userkey *key;
char *comment, *alg;
int alglen, commlen;
int bloblen;
key = smalloc(sizeof(struct ssh2_userkey));
alglen = GET_32BIT(p);
p += 4;
alg = p;
p += alglen;
/* Add further algorithm names here. */
if (alglen == 7 && !memcmp(alg, "ssh-rsa", 7))
key->alg = &ssh_rsa;
else if (alglen == 7 && !memcmp(alg, "ssh-dss", 7))
key->alg = &ssh_dss;
else {
sfree(key);
goto failure;
}
bloblen =
GET_32BIT((unsigned char *) msg) - (p -
(unsigned char *) msg -
4);
key->data = key->alg->openssh_createkey(&p, &bloblen);
if (!key->data) {
sfree(key);
goto failure;
}
commlen = GET_32BIT(p);
p += 4;
comment = smalloc(commlen + 1);
if (comment) {
memcpy(comment, p, commlen);
comment[commlen] = '\0';
}
key->comment = comment;
PUT_32BIT(ret, 1);
ret[4] = SSH_AGENT_FAILURE;
if (add234(ssh2keys, key) == key) {
keylist_update();
ret[4] = SSH_AGENT_SUCCESS;
} else {
key->alg->freekey(key->data);
sfree(key->comment);
sfree(key);
}
}
break;
case SSH1_AGENTC_REMOVE_RSA_IDENTITY:
/*