libssh2-encryptedpem.patch
commit 8304968ceb516ea21740f7c5383fa4a3a8d84e46
Author: Keno Fischer <kfischer@college.harvard.edu>
Date: Wed Jul 20 18:49:21 2016 -0400
Add supported for passphrase-protected PEM files to WinCNG and GCrypt backends
Since they use our own PEM parser which did not support encrypted PEM files,
trying to use such files on these backends failed. Fix that by augmenting
the PEM parser to support encrypted PEM files.
diff --git a/src/crypt.c b/src/crypt.c
index 931ae8b..853682d 100644
--- a/src/crypt.c
+++ b/src/crypt.c
@@ -53,6 +53,7 @@ crypt_none_crypt(LIBSSH2_SESSION * session, unsigned char *buf,
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_none = {
"none",
+ "DEK-Info: NONE"
8, /* blocksize (SSH2 defines minimum blocksize as 8) */
0, /* iv_len */
0, /* secret_len */
@@ -119,6 +120,7 @@ crypt_dtor(LIBSSH2_SESSION * session, void **abstract)
#if LIBSSH2_AES_CTR
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_ctr = {
"aes128-ctr",
+ "",
16, /* blocksize */
16, /* initial value length */
16, /* secret length -- 16*8 == 128bit */
@@ -131,6 +133,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_ctr = {
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_ctr = {
"aes192-ctr",
+ "",
16, /* blocksize */
16, /* initial value length */
24, /* secret length -- 24*8 == 192bit */
@@ -143,6 +146,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_ctr = {
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_ctr = {
"aes256-ctr",
+ "",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
@@ -157,6 +161,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_ctr = {
#if LIBSSH2_AES
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_cbc = {
"aes128-cbc",
+ "DEK-Info: AES-128-CBC",
16, /* blocksize */
16, /* initial value length */
16, /* secret length -- 16*8 == 128bit */
@@ -169,6 +174,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_cbc = {
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_cbc = {
"aes192-cbc",
+ "DEK-Info: AES-192-CBC",
16, /* blocksize */
16, /* initial value length */
24, /* secret length -- 24*8 == 192bit */
@@ -181,6 +187,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_cbc = {
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_cbc = {
"aes256-cbc",
+ "DEK-Info: AES-256-CBC",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
@@ -195,6 +202,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_cbc = {
static const LIBSSH2_CRYPT_METHOD
libssh2_crypt_method_rijndael_cbc_lysator_liu_se = {
"rijndael-cbc@lysator.liu.se",
+ "DEK-Info: AES-256-CBC",
16, /* blocksize */
16, /* initial value length */
32, /* secret length -- 32*8 == 256bit */
@@ -209,6 +217,7 @@ static const LIBSSH2_CRYPT_METHOD
#if LIBSSH2_BLOWFISH
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_blowfish_cbc = {
"blowfish-cbc",
+ "",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
@@ -223,6 +232,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_blowfish_cbc = {
#if LIBSSH2_RC4
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour = {
"arcfour",
+ "DEK-Info: RC4",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
@@ -258,6 +268,7 @@ crypt_init_arcfour128(LIBSSH2_SESSION * session,
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour128 = {
"arcfour128",
+ "",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
@@ -272,6 +283,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour128 = {
#if LIBSSH2_CAST
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_cast128_cbc = {
"cast128-cbc",
+ "",
8, /* blocksize */
8, /* initial value length */
16, /* secret length */
@@ -286,6 +298,7 @@ static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_cast128_cbc = {
#if LIBSSH2_3DES
static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_3des_cbc = {
"3des-cbc",
+ "DEK-Info: DES-EDE3-CBC",
8, /* blocksize */
8, /* initial value length */
24, /* secret length */
diff --git a/src/libgcrypt.c b/src/libgcrypt.c
index 366d007..901be05 100644
--- a/src/libgcrypt.c
+++ b/src/libgcrypt.c
@@ -172,8 +172,6 @@ _libssh2_rsa_new_private(libssh2_rsa_ctx ** rsa,
unsigned char *n, *e, *d, *p, *q, *e1, *e2, *coeff;
unsigned int nlen, elen, dlen, plen, qlen, e1len, e2len, coefflen;
- (void) passphrase;
-
fp = fopen(filename, "r");
if (!fp) {
return -1;
@@ -182,6 +180,7 @@ _libssh2_rsa_new_private(libssh2_rsa_ctx ** rsa,
ret = _libssh2_pem_parse(session,
"-----BEGIN RSA PRIVATE KEY-----",
"-----END RSA PRIVATE KEY-----",
+ passphrase,
fp, &data, &datalen);
fclose(fp);
if (ret) {
@@ -285,8 +284,6 @@ _libssh2_dsa_new_private(libssh2_dsa_ctx ** dsa,
unsigned char *p, *q, *g, *y, *x;
unsigned int plen, qlen, glen, ylen, xlen;
- (void) passphrase;
-
fp = fopen(filename, "r");
if (!fp) {
return -1;
@@ -295,6 +292,7 @@ _libssh2_dsa_new_private(libssh2_dsa_ctx ** dsa,
ret = _libssh2_pem_parse(session,
"-----BEGIN DSA PRIVATE KEY-----",
"-----END DSA PRIVATE KEY-----",
+ passphrase,
fp, &data, &datalen);
fclose(fp);
if (ret) {
diff --git a/src/libssh2_priv.h b/src/libssh2_priv.h
index b4296a2..77b51a9 100644
--- a/src/libssh2_priv.h
+++ b/src/libssh2_priv.h
@@ -884,6 +884,7 @@ struct _LIBSSH2_HOSTKEY_METHOD
struct _LIBSSH2_CRYPT_METHOD
{
const char *name;
+ const char *pem_annotation;
int blocksize;
@@ -1041,6 +1042,7 @@ const LIBSSH2_HOSTKEY_METHOD **libssh2_hostkey_methods(void);
int _libssh2_pem_parse(LIBSSH2_SESSION * session,
const char *headerbegin,
const char *headerend,
+ const unsigned char *passphrase,
FILE * fp, unsigned char **data, unsigned int *datalen);
int _libssh2_pem_parse_memory(LIBSSH2_SESSION * session,
const char *headerbegin,
diff --git a/src/os400qc3.c b/src/os400qc3.c
index f8e46ab..a42b374 100644
--- a/src/os400qc3.c
+++ b/src/os400qc3.c
@@ -2120,6 +2120,7 @@ try_pem_load(LIBSSH2_SESSION *session, FILE *fp,
fseek(fp, 0L, SEEK_SET);
for (;;) {
ret = _libssh2_pem_parse(session, header, trailer,
+ NULL,
fp, &data, &datalen);
if (!ret) {
diff --git a/src/pem.c b/src/pem.c
index 9f51bba..523d9c5 100644
--- a/src/pem.c
+++ b/src/pem.c
@@ -37,6 +37,7 @@
*/
#include "libssh2_priv.h"
+#include <assert.h>
static int
readline(char *line, int line_size, FILE * fp)
@@ -96,16 +97,26 @@ readline_memory(char *line, size_t line_size,
#define LINE_SIZE 128
+const char *crypt_annotation = "Proc-Type: 4,ENCRYPTED";
+
+static unsigned char hex_decode(char digit)
+{
+ return (digit >= 'A') ? 0xA + (digit - 'A') : (digit - '0');
+}
+
int
_libssh2_pem_parse(LIBSSH2_SESSION * session,
const char *headerbegin,
const char *headerend,
+ const unsigned char *passphrase,
FILE * fp, unsigned char **data, unsigned int *datalen)
{
char line[LINE_SIZE];
+ unsigned char iv[LINE_SIZE];
char *b64data = NULL;
unsigned int b64datalen = 0;
int ret;
+ const LIBSSH2_CRYPT_METHOD *method = NULL;
do {
*line = '\0';
@@ -116,7 +127,45 @@ _libssh2_pem_parse(LIBSSH2_SESSION * session,
}
while (strcmp(line, headerbegin) != 0);
- *line = '\0';
+ if (readline(line, LINE_SIZE, fp)) {
+ return -1;
+ }
+
+ if (passphrase &&
+ memcmp(line, crypt_annotation, strlen(crypt_annotation)) == 0) {
+ const LIBSSH2_CRYPT_METHOD **all_methods, *cur_method;
+ int i;
+
+ if (readline(line, LINE_SIZE, fp)) {
+ ret = -1;
+ goto out;
+ }
+ all_methods = libssh2_crypt_methods();
+ while ((cur_method = *all_methods++)) {
+ if (*cur_method->pem_annotation &&
+ memcmp(line, cur_method->pem_annotation, strlen(cur_method->pem_annotation)) == 0) {
+ method = cur_method;
+ memcpy(iv, line+strlen(method->pem_annotation)+1, 2*method->iv_len);
+ }
+ }
+
+ /* None of the available crypt methods were able to decrypt this key */
+ if (method == NULL)
+ return -1;
+
+ /* Decode IV from hex */
+ for (i = 0; i < method->iv_len; ++i)
+ {
+ iv[i] = hex_decode(iv[2*i]) << 4;
+ iv[i] |= hex_decode(iv[2*i+1]);
+ }
+
+ /* skip to the next line */
+ if (readline(line, LINE_SIZE, fp)) {
+ ret = -1;
+ goto out;
+ }
+ }
do {
if (*line) {
@@ -152,6 +201,72 @@ _libssh2_pem_parse(LIBSSH2_SESSION * session,
goto out;
}
+ if (method) {
+ /* Set up decryption */
+ int free_iv = 0, free_secret = 0, len_decrypted = 0, padding = 0;
+ int blocksize = method->blocksize;
+ void *abstract;
+ unsigned char secret[2*MD5_DIGEST_LENGTH];
+ libssh2_md5_ctx fingerprint_ctx;
+
+ /* Perform key derivation (PBKDF1/MD5) */
+ if (!libssh2_md5_init(&fingerprint_ctx)) {
+ ret = -1;
+ goto out;
+ }
+ libssh2_md5_update(fingerprint_ctx, passphrase, strlen((char*)passphrase));
+ libssh2_md5_update(fingerprint_ctx, iv, 8);
+ libssh2_md5_final(fingerprint_ctx, secret);
+ if (method->secret_len > MD5_DIGEST_LENGTH) {
+ if (!libssh2_md5_init(&fingerprint_ctx)) {
+ ret = -1;
+ goto out;
+ }
+ libssh2_md5_update(fingerprint_ctx, secret, MD5_DIGEST_LENGTH);
+ libssh2_md5_update(fingerprint_ctx, passphrase, strlen((char*)passphrase));
+ libssh2_md5_update(fingerprint_ctx, iv, 8);
+ libssh2_md5_final(fingerprint_ctx, secret + MD5_DIGEST_LENGTH);
+ }
+
+ /* Initialize the decryption */
+ if (method->init(session, method, iv, &free_iv, secret,
+ &free_secret, 0, &abstract)) {
+ memset((char*)secret, 0, sizeof(secret));
+ LIBSSH2_FREE(session, data);
+ ret = -1;
+ goto out;
+ }
+
+ if (free_secret) {
+ memset((char*)secret, 0, sizeof(secret));
+ }
+
+ /* Do the actual decryption */
+ assert((*datalen % blocksize) == 0);
+
+ while (len_decrypted <= *datalen - blocksize) {
+ if (method->crypt(session, *data + len_decrypted, blocksize,
+ &abstract)) {
+ ret = LIBSSH2_ERROR_DECRYPT;
+ method->dtor(session, &abstract);
+ memset(*data, 0, *datalen);
+ LIBSSH2_FREE(session, *data);
+ goto out;
+ }
+
+ len_decrypted += blocksize;
+ }
+
+ /* Account for padding */
+ padding = (*data)[*datalen - 1];
+ memset(&(*data)[*datalen-padding],0,padding);
+ *datalen -= padding;
+
+ /* Clean up */
+ memset((char*)secret, 0, sizeof(secret));
+ method->dtor(session, &abstract);
+ }
+
ret = 0;
out:
if (b64data) {
diff --git a/src/wincng.c b/src/wincng.c
index d3271b3..e6278c3 100755
--- a/src/wincng.c
+++ b/src/wincng.c
@@ -537,14 +537,13 @@ _libssh2_wincng_load_pem(LIBSSH2_SESSION *session,
FILE *fp;
int ret;
- (void)passphrase;
-
fp = fopen(filename, "r");
if (!fp) {
return -1;
}
ret = _libssh2_pem_parse(session, headerbegin, headerend,
+ passphrase,
fp, data, datalen);
fclose(fp);
diff --git a/tests/etc/user b/tests/etc/user
index 01bf6ac..5f1783d 100644
--- a/tests/etc/user
+++ b/tests/etc/user
@@ -1,27 +1,30 @@
-----BEGIN RSA PRIVATE KEY-----
-MIIEoQIBAAKCAQEAxIgBuZS39D4bFnWminE7svGQLdVKx1aWKnEYEa+XtNU4DKZ/
-pxUHg0zbEBya+IkX1yqQYWALoiOwI8XhdemLp8g03BX7o+DLSWisfiHpCDVGAuNq
-RDF7qnFyL/ZBH6e0XKMtsoB51TDuBc4Rxh6p1V2QL/fg8BoHcCrnKkoqN8PSoKUX
-2lPKJ3JIF/P8cDLbKYCvbSTFOdf56eqg0GJe7jFtSwweE9yz3IWZ3kSS1E/9E6sX
-aNCu/hUt1bvQthICQyBNoTtQP/igEUJ7n0GMetsnq9wiUSomLzWqIWNqmvOv62aC
-XRi5sYgpSAR4Zvnm3Cx/Wl0BEPz2rrFkG+G0SQIBIwKCAQEAgSYtBOyzZfztOqUV
-q277WFWZQrC8HJf8R8aparU3zpq+braOZnuImByP9KUVYX6pRECKw6WD/NWfonq4
-uzMSoXTviVBGRx6xeWIK880kG1Y1UlruD447Ur+ULiV7QLAIzylnLCiKk2lL9S+l
-R63AD95mEOS4Y0ROB+Gt2fY5ABHRMqhGLvRKK8qwn35C1Z9qnTGhgiRbeoc373A5
-ZAYyegyLnbvyV47UfPYS/TVzxZ9RCx3D3I/9fI7ZAFafkkIufQX3QPaVxf0zFUwW
-de/f+gTbySTL4RDF185Evunx+tYvzCyIimB0cTE5dfsCWcHDtO6DwehKiOgJsbeW
-IrpeTwKBgQDnEMfv7ORR35Ouj91iNCSfLU/v0TSzAJBfqYovByhXRsopgWAKXUmH
-mWpBBP5vcGu3NvKfiZcMMbBPfllvlxkafQwvCqrdn5mg01MdAHMWP/O9yfvuxMDE
-KycU2G2CT8j85mIPn19WeIgXC/kws+P0RAVNCBNeq89Gvp4IdLN67wKBgQDZvTYh
-TPCYG32jBK+CcWmOna2SLvBloDcNevhzfu3RGjLIXzUHGxLdx7slsP/tpndmXIAL
-CgV6GfrLxix5bO08203S2qnnwP8VrjjNIv1CyZIbbQFAFIeC3QxZMZHnXieLrO0z
-qF5CuUXcL3cMeGmF/0HN/rB+4sF0qfv8wD8kRwKBgFXTCG8O2HYueK6NNPiXBknA
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-pXCO7wHcMb9kb1PqOWAJIASqG78V4TLrdOp8Re6Sqb0FHRu+2kSwbQ/f4DapN2lb
-F+lpZke8KGq71ExImm99AoGAN/10UbSy5UjlytVRs9QFM00eAQTBeTfTpGFzFmJ3
-qsw48bIU8zLY9zNcAmC21rXG7m+Oo8C/lG0UmsyPF+jPSinDjf22qU7iger4qccr
-Lm5YxTlJduC1IaaOJZBnWMBwkaF+0sTlCdfew5ctPbiQKcVLb3wBf7amxjpWvVYB
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-qu9tBburQoSlym9aQp41CMxIyHrL4GnwRlJkTTEVhDuab1HmKw==
+Proc-Type: 4,ENCRYPTED
+DEK-Info: AES-128-CBC,452208EE925946C14BF29ABD1425A8DF
+
+qTRxBL3/Ldh3NjoYUpZ+IsiQDqLrVG/rS20w1yQJMFXf+VPu+MjlWhGhrB6yscAH
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++jBpZc54EWk6OP99aUoqDk2tMMyi7FBZgtzY+yWqsvb8oB0RStmbqxxdy27EkHvD
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+jy3LwEdOKAk/d/etr8wL/WWZ+w334TG7pMoAKErVJ/NexG4vzzHedExvTaEMD/eS
-----END RSA PRIVATE KEY-----
diff --git a/tests/etc/user-decrypted b/tests/etc/user-decrypted
new file mode 100644
index 0000000..f99cf65
--- /dev/null
+++ b/tests/etc/user-decrypted
@@ -0,0 +1,27 @@
+*data[*datalen - 1]-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEAl46YP4uEaIStJEUuGEa6/dmtykdWrZCTqM9iOnfVNawlM8tE
+6yHppI8c6FppPRErhlFfzEUqqeB4o19vAyTNYB3WyfNUbtSVvWbNz5+j4jvllC/8
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++J+zF34vKy4ZhujGTpv9v02sQz3NP/I7Q74u8ptLNDa6GhLv4N2w+6Fg3xn0VIvw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+-----END RSA PRIVATE KEY-----
diff --git a/tests/etc/user.pub b/tests/etc/user.pub
index c60e90d..2fc7b4b 100644
--- a/tests/etc/user.pub
+++ b/tests/etc/user.pub
@@ -1 +1 @@
-ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAxIgBuZS39D4bFnWminE7svGQLdVKx1aWKnEYEa+XtNU4DKZ/pxUHg0zbEBya+IkX1yqQYWALoiOwI8XhdemLp8g03BX7o+DLSWisfiHpCDVGAuNqRDF7qnFyL/ZBH6e0XKMtsoB51TDuBc4Rxh6p1V2QL/fg8BoHcCrnKkoqN8PSoKUX2lPKJ3JIF/P8cDLbKYCvbSTFOdf56eqg0GJe7jFtSwweE9yz3IWZ3kSS1E/9E6sXaNCu/hUt1bvQthICQyBNoTtQP/igEUJ7n0GMetsnq9wiUSomLzWqIWNqmvOv62aCXRi5sYgpSAR4Zvnm3Cx/Wl0BEPz2rrFkG+G0SQ== jas@mocca
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCXjpg/i4RohK0kRS4YRrr92a3KR1atkJOoz2I6d9U1rCUzy0TrIemkjxzoWmk9ESuGUV/MRSqp4HijX28DJM1gHdbJ81Ru1JW9Zs3Pn6PiO+WUL/ztMPmsan0nMCMW2bMlxPkamW8eIFX1qoCd++mUD0LhweZ1MKFI+DwLi09egw2FOXQaY1USFN2IHNB0Cw88kafalDMVwXZ+fIdw9QP1KHHg/jx1pyYvj9P2bBJnQisGS5Cpy7SYThFJ3qZK5dGXhKIW/i82YgaW3Q0gGDK1lt2L9tuQnv2I2LIJoXGNYOH5848CokBAJKNOeO9el7ebEN7YznwXqoRMca7eyxU5 libssh2test@example.com
