X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/94ec8c6bb36d0681d3d8e61de9b260b159772799..HEAD:/authfile.c diff --git a/authfile.c b/authfile.c index d1a97d77..2c615709 100644 --- a/authfile.c +++ b/authfile.c @@ -1,3 +1,4 @@ +/* $OpenBSD: authfile.c,v 1.79 2010/01/12 00:16:47 dtucker Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland @@ -36,22 +37,41 @@ */ #include "includes.h" -RCSID("$OpenBSD: authfile.c,v 1.20 2000/10/11 20:27:23 markus Exp $"); -#include -#include -#include -#include +#include +#include +#include +#include + +#include #include +#include + +/* compatibility with old or broken OpenSSL versions */ +#include "openbsd-compat/openssl-compat.h" + +#include +#include +#include +#include +#include +#include +#include #include "xmalloc.h" +#include "cipher.h" #include "buffer.h" -#include "bufaux.h" -#include "ssh.h" #include "key.h" +#include "ssh.h" +#include "log.h" +#include "authfile.h" +#include "rsa.h" +#include "misc.h" +#include "atomicio.h" -/* Version identification string for identity files. */ -#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n" +/* Version identification string for SSH v1 identity files. */ +static const char authfile_id_string[] = + "SSH PRIVATE KEY FILE FORMAT 1.1\n"; /* * Saves the authentication (private) key in a file, encrypting it with @@ -60,35 +80,33 @@ RCSID("$OpenBSD: authfile.c,v 1.20 2000/10/11 20:27:23 markus Exp $"); * passphrase. */ -int -save_private_key_rsa(const char *filename, const char *passphrase, - RSA *key, const char *comment) +static int +key_save_private_rsa1(Key *key, const char *filename, const char *passphrase, + const char *comment) { Buffer buffer, encrypted; - char buf[100], *cp; - int fd, i; + u_char buf[100], *cp; + int fd, i, cipher_num; CipherContext ciphercontext; Cipher *cipher; - u_int32_t rand; + u_int32_t rnd; /* * If the passphrase is empty, use SSH_CIPHER_NONE to ease converting * to another cipher; otherwise use SSH_AUTHFILE_CIPHER. */ - if (strcmp(passphrase, "") == 0) - cipher = cipher_by_number(SSH_CIPHER_NONE); - else - cipher = cipher_by_number(SSH_AUTHFILE_CIPHER); - if (cipher == NULL) + cipher_num = (strcmp(passphrase, "") == 0) ? + SSH_CIPHER_NONE : SSH_AUTHFILE_CIPHER; + if ((cipher = cipher_by_number(cipher_num)) == NULL) fatal("save_private_key_rsa: bad cipher"); /* This buffer is used to built the secret part of the private key. */ buffer_init(&buffer); /* Put checkbytes for checking passphrase validity. */ - rand = arc4random(); - buf[0] = rand & 0xff; - buf[1] = (rand >> 8) & 0xff; + rnd = arc4random(); + buf[0] = rnd & 0xff; + buf[1] = (rnd >> 8) & 0xff; buf[2] = buf[0]; buf[3] = buf[1]; buffer_append(&buffer, buf, 4); @@ -98,10 +116,10 @@ save_private_key_rsa(const char *filename, const char *passphrase, * will be stored in plain text, and storing them also in encrypted * format would just give known plaintext). */ - buffer_put_bignum(&buffer, key->d); - buffer_put_bignum(&buffer, key->iqmp); - buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */ - buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */ + buffer_put_bignum(&buffer, key->rsa->d); + buffer_put_bignum(&buffer, key->rsa->iqmp); + buffer_put_bignum(&buffer, key->rsa->q); /* reverse from SSL p */ + buffer_put_bignum(&buffer, key->rsa->p); /* reverse from SSL q */ /* Pad the part to be encrypted until its size is a multiple of 8. */ while (buffer_len(&buffer) % 8 != 0) @@ -111,27 +129,28 @@ save_private_key_rsa(const char *filename, const char *passphrase, buffer_init(&encrypted); /* First store keyfile id string. */ - cp = AUTHFILE_ID_STRING; - for (i = 0; cp[i]; i++) - buffer_put_char(&encrypted, cp[i]); + for (i = 0; authfile_id_string[i]; i++) + buffer_put_char(&encrypted, authfile_id_string[i]); buffer_put_char(&encrypted, 0); /* Store cipher type. */ - buffer_put_char(&encrypted, cipher->number); + buffer_put_char(&encrypted, cipher_num); buffer_put_int(&encrypted, 0); /* For future extension */ /* Store public key. This will be in plain text. */ - buffer_put_int(&encrypted, BN_num_bits(key->n)); - buffer_put_bignum(&encrypted, key->n); - buffer_put_bignum(&encrypted, key->e); - buffer_put_string(&encrypted, comment, strlen(comment)); + buffer_put_int(&encrypted, BN_num_bits(key->rsa->n)); + buffer_put_bignum(&encrypted, key->rsa->n); + buffer_put_bignum(&encrypted, key->rsa->e); + buffer_put_cstring(&encrypted, comment); /* Allocate space for the private part of the key in the buffer. */ - buffer_append_space(&encrypted, &cp, buffer_len(&buffer)); + cp = buffer_append_space(&encrypted, buffer_len(&buffer)); - cipher_set_key_string(&ciphercontext, cipher, passphrase); - cipher_encrypt(&ciphercontext, (unsigned char *) cp, - (unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer)); + cipher_set_key_string(&ciphercontext, cipher, passphrase, + CIPHER_ENCRYPT); + cipher_crypt(&ciphercontext, cp, + buffer_ptr(&buffer), buffer_len(&buffer)); + cipher_cleanup(&ciphercontext); memset(&ciphercontext, 0, sizeof(ciphercontext)); /* Destroy temporary data. */ @@ -139,12 +158,15 @@ save_private_key_rsa(const char *filename, const char *passphrase, buffer_free(&buffer); fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); - if (fd < 0) + if (fd < 0) { + error("open %s failed: %s.", filename, strerror(errno)); + buffer_free(&encrypted); return 0; - if (write(fd, buffer_ptr(&encrypted), buffer_len(&encrypted)) != - buffer_len(&encrypted)) { - debug("Write to key file %.200s failed: %.100s", filename, - strerror(errno)); + } + if (atomicio(vwrite, fd, buffer_ptr(&encrypted), + buffer_len(&encrypted)) != buffer_len(&encrypted)) { + error("write to key file %s failed: %s", filename, + strerror(errno)); buffer_free(&encrypted); close(fd); unlink(filename); @@ -155,147 +177,156 @@ save_private_key_rsa(const char *filename, const char *passphrase, return 1; } -/* save DSA key in OpenSSL PEM format */ - -int -save_private_key_dsa(const char *filename, const char *passphrase, - DSA *dsa, const char *comment) +/* save SSH v2 key in OpenSSL PEM format */ +static int +key_save_private_pem(Key *key, const char *filename, const char *_passphrase, + const char *comment) { FILE *fp; int fd; - int success = 1; - int len = strlen(passphrase); + int success = 0; + int len = strlen(_passphrase); + u_char *passphrase = (len > 0) ? (u_char *)_passphrase : NULL; +#if (OPENSSL_VERSION_NUMBER < 0x00907000L) + const EVP_CIPHER *cipher = (len > 0) ? EVP_des_ede3_cbc() : NULL; +#else + const EVP_CIPHER *cipher = (len > 0) ? EVP_aes_128_cbc() : NULL; +#endif if (len > 0 && len <= 4) { - error("passphrase too short: %d bytes", len); - errno = 0; + error("passphrase too short: have %d bytes, need > 4", len); return 0; } fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600); if (fd < 0) { - debug("open %s failed", filename); + error("open %s failed: %s.", filename, strerror(errno)); return 0; } fp = fdopen(fd, "w"); - if (fp == NULL ) { - debug("fdopen %s failed", filename); + if (fp == NULL) { + error("fdopen %s failed: %s.", filename, strerror(errno)); close(fd); return 0; } - if (len > 0) { - if (!PEM_write_DSAPrivateKey(fp, dsa, EVP_des_ede3_cbc(), - (char *)passphrase, strlen(passphrase), NULL, NULL)) - success = 0; - } else { - if (!PEM_write_DSAPrivateKey(fp, dsa, NULL, - NULL, 0, NULL, NULL)) - success = 0; + switch (key->type) { + case KEY_DSA: + success = PEM_write_DSAPrivateKey(fp, key->dsa, + cipher, passphrase, len, NULL, NULL); + break; + case KEY_RSA: + success = PEM_write_RSAPrivateKey(fp, key->rsa, + cipher, passphrase, len, NULL, NULL); + break; } fclose(fp); return success; } int -save_private_key(const char *filename, const char *passphrase, Key *key, +key_save_private(Key *key, const char *filename, const char *passphrase, const char *comment) { switch (key->type) { - case KEY_RSA: - return save_private_key_rsa(filename, passphrase, key->rsa, comment); - break; + case KEY_RSA1: + return key_save_private_rsa1(key, filename, passphrase, + comment); case KEY_DSA: - return save_private_key_dsa(filename, passphrase, key->dsa, comment); - break; + case KEY_RSA: + return key_save_private_pem(key, filename, passphrase, + comment); default: break; } + error("key_save_private: cannot save key type %d", key->type); return 0; } /* - * Loads the public part of the key file. Returns 0 if an error was - * encountered (the file does not exist or is not readable), and non-zero + * Loads the public part of the ssh v1 key file. Returns NULL if an error was + * encountered (the file does not exist or is not readable), and the key * otherwise. */ -int -load_public_key_rsa(const char *filename, RSA * pub, char **comment_return) +static Key * +key_load_public_rsa1(int fd, const char *filename, char **commentp) { - int fd, i; - off_t len; Buffer buffer; + Key *pub; + struct stat st; char *cp; + u_int i; + size_t len; - fd = open(filename, O_RDONLY); - if (fd < 0) - return 0; - len = lseek(fd, (off_t) 0, SEEK_END); - lseek(fd, (off_t) 0, SEEK_SET); + if (fstat(fd, &st) < 0) { + error("fstat for key file %.200s failed: %.100s", + filename, strerror(errno)); + return NULL; + } + if (st.st_size > 1*1024*1024) { + error("key file %.200s too large", filename); + return NULL; + } + len = (size_t)st.st_size; /* truncated */ buffer_init(&buffer); - buffer_append_space(&buffer, &cp, len); + cp = buffer_append_space(&buffer, len); - if (read(fd, cp, (size_t) len) != (size_t) len) { + if (atomicio(read, fd, cp, len) != len) { debug("Read from key file %.200s failed: %.100s", filename, strerror(errno)); buffer_free(&buffer); - close(fd); - return 0; + return NULL; } - close(fd); - /* Check that it is at least big enought to contain the ID string. */ - if (len < strlen(AUTHFILE_ID_STRING) + 1) { - debug("Bad key file %.200s.", filename); + /* Check that it is at least big enough to contain the ID string. */ + if (len < sizeof(authfile_id_string)) { + debug3("Not a RSA1 key file %.200s.", filename); buffer_free(&buffer); - return 0; + return NULL; } /* * Make sure it begins with the id string. Consume the id string * from the buffer. */ - for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) - if (buffer_get_char(&buffer) != (u_char) AUTHFILE_ID_STRING[i]) { - debug("Bad key file %.200s.", filename); + for (i = 0; i < sizeof(authfile_id_string); i++) + if (buffer_get_char(&buffer) != authfile_id_string[i]) { + debug3("Not a RSA1 key file %.200s.", filename); buffer_free(&buffer); - return 0; + return NULL; } /* Skip cipher type and reserved data. */ (void) buffer_get_char(&buffer); /* cipher type */ (void) buffer_get_int(&buffer); /* reserved */ /* Read the public key from the buffer. */ - buffer_get_int(&buffer); - /* XXX alloc */ - if (pub->n == NULL) - pub->n = BN_new(); - buffer_get_bignum(&buffer, pub->n); - /* XXX alloc */ - if (pub->e == NULL) - pub->e = BN_new(); - buffer_get_bignum(&buffer, pub->e); - if (comment_return) - *comment_return = buffer_get_string(&buffer, NULL); + (void) buffer_get_int(&buffer); + pub = key_new(KEY_RSA1); + buffer_get_bignum(&buffer, pub->rsa->n); + buffer_get_bignum(&buffer, pub->rsa->e); + if (commentp) + *commentp = buffer_get_string(&buffer, NULL); /* The encrypted private part is not parsed by this function. */ buffer_free(&buffer); - - return 1; + return pub; } -/* load public key from private-key file */ -int -load_public_key(const char *filename, Key * key, char **comment_return) +/* load public key from private-key file, works only for SSH v1 */ +Key * +key_load_public_type(int type, const char *filename, char **commentp) { - switch (key->type) { - case KEY_RSA: - return load_public_key_rsa(filename, key->rsa, comment_return); - break; - case KEY_DSA: - default: - break; + Key *pub; + int fd; + + if (type == KEY_RSA1) { + fd = open(filename, O_RDONLY); + if (fd < 0) + return NULL; + pub = key_load_public_rsa1(fd, filename, commentp); + close(fd); + return pub; } - return 0; + return NULL; } /* @@ -305,62 +336,75 @@ load_public_key(const char *filename, Key * key, char **comment_return) * Assumes we are called under uid of the owner of the file. */ -int -load_private_key_rsa(int fd, const char *filename, - const char *passphrase, RSA * prv, char **comment_return) +static Key * +key_load_private_rsa1(int fd, const char *filename, const char *passphrase, + char **commentp) { - int i, check1, check2, cipher_type; - off_t len; + u_int i; + int check1, check2, cipher_type; + size_t len; Buffer buffer, decrypted; - char *cp; + u_char *cp; CipherContext ciphercontext; Cipher *cipher; - BN_CTX *ctx; - BIGNUM *aux; + Key *prv = NULL; + struct stat st; - len = lseek(fd, (off_t) 0, SEEK_END); - lseek(fd, (off_t) 0, SEEK_SET); + if (fstat(fd, &st) < 0) { + error("fstat for key file %.200s failed: %.100s", + filename, strerror(errno)); + close(fd); + return NULL; + } + if (st.st_size > 1*1024*1024) { + error("key file %.200s too large", filename); + close(fd); + return (NULL); + } + len = (size_t)st.st_size; /* truncated */ buffer_init(&buffer); - buffer_append_space(&buffer, &cp, len); + cp = buffer_append_space(&buffer, len); - if (read(fd, cp, (size_t) len) != (size_t) len) { + if (atomicio(read, fd, cp, len) != len) { debug("Read from key file %.200s failed: %.100s", filename, - strerror(errno)); + strerror(errno)); buffer_free(&buffer); close(fd); - return 0; + return NULL; } - close(fd); - /* Check that it is at least big enought to contain the ID string. */ - if (len < strlen(AUTHFILE_ID_STRING) + 1) { - debug("Bad key file %.200s.", filename); + /* Check that it is at least big enough to contain the ID string. */ + if (len < sizeof(authfile_id_string)) { + debug3("Not a RSA1 key file %.200s.", filename); buffer_free(&buffer); - return 0; + close(fd); + return NULL; } /* * Make sure it begins with the id string. Consume the id string * from the buffer. */ - for (i = 0; i < (unsigned int) strlen(AUTHFILE_ID_STRING) + 1; i++) - if (buffer_get_char(&buffer) != (unsigned char) AUTHFILE_ID_STRING[i]) { - debug("Bad key file %.200s.", filename); + for (i = 0; i < sizeof(authfile_id_string); i++) + if (buffer_get_char(&buffer) != authfile_id_string[i]) { + debug3("Not a RSA1 key file %.200s.", filename); buffer_free(&buffer); - return 0; + close(fd); + return NULL; } + /* Read cipher type. */ cipher_type = buffer_get_char(&buffer); (void) buffer_get_int(&buffer); /* Reserved data. */ /* Read the public key from the buffer. */ - buffer_get_int(&buffer); - prv->n = BN_new(); - buffer_get_bignum(&buffer, prv->n); - prv->e = BN_new(); - buffer_get_bignum(&buffer, prv->e); - if (comment_return) - *comment_return = buffer_get_string(&buffer, NULL); + (void) buffer_get_int(&buffer); + prv = key_new_private(KEY_RSA1); + + buffer_get_bignum(&buffer, prv->rsa->n); + buffer_get_bignum(&buffer, prv->rsa->e); + if (commentp) + *commentp = buffer_get_string(&buffer, NULL); else xfree(buffer_get_string(&buffer, NULL)); @@ -374,12 +418,14 @@ load_private_key_rsa(int fd, const char *filename, } /* Initialize space for decrypted data. */ buffer_init(&decrypted); - buffer_append_space(&decrypted, &cp, buffer_len(&buffer)); + cp = buffer_append_space(&decrypted, buffer_len(&buffer)); /* Rest of the buffer is encrypted. Decrypt it using the passphrase. */ - cipher_set_key_string(&ciphercontext, cipher, passphrase); - cipher_decrypt(&ciphercontext, (unsigned char *) cp, - (unsigned char *) buffer_ptr(&buffer), buffer_len(&buffer)); + cipher_set_key_string(&ciphercontext, cipher, passphrase, + CIPHER_DECRYPT); + cipher_crypt(&ciphercontext, cp, + buffer_ptr(&buffer), buffer_len(&buffer)); + cipher_cleanup(&ciphercontext); memset(&ciphercontext, 0, sizeof(ciphercontext)); buffer_free(&buffer); @@ -388,149 +434,213 @@ load_private_key_rsa(int fd, const char *filename, if (check1 != buffer_get_char(&decrypted) || check2 != buffer_get_char(&decrypted)) { if (strcmp(passphrase, "") != 0) - debug("Bad passphrase supplied for key file %.200s.", filename); + debug("Bad passphrase supplied for key file %.200s.", + filename); /* Bad passphrase. */ buffer_free(&decrypted); -fail: - BN_clear_free(prv->n); - prv->n = NULL; - BN_clear_free(prv->e); - prv->e = NULL; - if (comment_return) - xfree(*comment_return); - return 0; + goto fail; } /* Read the rest of the private key. */ - prv->d = BN_new(); - buffer_get_bignum(&decrypted, prv->d); - prv->iqmp = BN_new(); - buffer_get_bignum(&decrypted, prv->iqmp); /* u */ - /* in SSL and SSH p and q are exchanged */ - prv->q = BN_new(); - buffer_get_bignum(&decrypted, prv->q); /* p */ - prv->p = BN_new(); - buffer_get_bignum(&decrypted, prv->p); /* q */ - - ctx = BN_CTX_new(); - aux = BN_new(); - - BN_sub(aux, prv->q, BN_value_one()); - prv->dmq1 = BN_new(); - BN_mod(prv->dmq1, prv->d, aux, ctx); - - BN_sub(aux, prv->p, BN_value_one()); - prv->dmp1 = BN_new(); - BN_mod(prv->dmp1, prv->d, aux, ctx); - - BN_clear_free(aux); - BN_CTX_free(ctx); + buffer_get_bignum(&decrypted, prv->rsa->d); + buffer_get_bignum(&decrypted, prv->rsa->iqmp); /* u */ + /* in SSL and SSH v1 p and q are exchanged */ + buffer_get_bignum(&decrypted, prv->rsa->q); /* p */ + buffer_get_bignum(&decrypted, prv->rsa->p); /* q */ + + /* calculate p-1 and q-1 */ + rsa_generate_additional_parameters(prv->rsa); buffer_free(&decrypted); - return 1; + /* enable blinding */ + if (RSA_blinding_on(prv->rsa, NULL) != 1) { + error("key_load_private_rsa1: RSA_blinding_on failed"); + goto fail; + } + close(fd); + return prv; + +fail: + if (commentp) + xfree(*commentp); + close(fd); + key_free(prv); + return NULL; } -int -load_private_key_dsa(int fd, const char *passphrase, Key *k, char **comment_return) +Key * +key_load_private_pem(int fd, int type, const char *passphrase, + char **commentp) { - DSA *dsa; - BIO *in; FILE *fp; + EVP_PKEY *pk = NULL; + Key *prv = NULL; + char *name = ""; - in = BIO_new(BIO_s_file()); - if (in == NULL) { - error("BIO_new failed"); - return 0; - } fp = fdopen(fd, "r"); if (fp == NULL) { - error("fdopen failed"); - return 0; + error("fdopen failed: %s", strerror(errno)); + close(fd); + return NULL; } - BIO_set_fp(in, fp, BIO_NOCLOSE); - dsa = PEM_read_bio_DSAPrivateKey(in, NULL, NULL, (char *)passphrase); - if (dsa == NULL) { - debug("PEM_read_bio_DSAPrivateKey failed"); + pk = PEM_read_PrivateKey(fp, NULL, NULL, (char *)passphrase); + if (pk == NULL) { + debug("PEM_read_PrivateKey failed"); + (void)ERR_get_error(); + } else if (pk->type == EVP_PKEY_RSA && + (type == KEY_UNSPEC||type==KEY_RSA)) { + prv = key_new(KEY_UNSPEC); + prv->rsa = EVP_PKEY_get1_RSA(pk); + prv->type = KEY_RSA; + name = "rsa w/o comment"; +#ifdef DEBUG_PK + RSA_print_fp(stderr, prv->rsa, 8); +#endif + if (RSA_blinding_on(prv->rsa, NULL) != 1) { + error("key_load_private_pem: RSA_blinding_on failed"); + key_free(prv); + prv = NULL; + } + } else if (pk->type == EVP_PKEY_DSA && + (type == KEY_UNSPEC||type==KEY_DSA)) { + prv = key_new(KEY_UNSPEC); + prv->dsa = EVP_PKEY_get1_DSA(pk); + prv->type = KEY_DSA; + name = "dsa w/o comment"; +#ifdef DEBUG_PK + DSA_print_fp(stderr, prv->dsa, 8); +#endif } else { - /* replace k->dsa with loaded key */ - DSA_free(k->dsa); - k->dsa = dsa; + error("PEM_read_PrivateKey: mismatch or " + "unknown EVP_PKEY save_type %d", pk->save_type); } - BIO_free(in); fclose(fp); - if (comment_return) - *comment_return = xstrdup("dsa w/o comment"); - debug("read DSA private key done"); -#ifdef DEBUG_DSS - DSA_print_fp(stderr, dsa, 8); -#endif - return dsa != NULL ? 1 : 0; + if (pk != NULL) + EVP_PKEY_free(pk); + if (prv != NULL && commentp) + *commentp = xstrdup(name); + debug("read PEM private key done: type %s", + prv ? key_type(prv) : ""); + return prv; } int -load_private_key(const char *filename, const char *passphrase, Key *key, - char **comment_return) +key_perm_ok(int fd, const char *filename) { - int fd; - int ret = 0; struct stat st; - fd = open(filename, O_RDONLY); - if (fd < 0) + if (fstat(fd, &st) < 0) return 0; - - /* check owner and modes */ + /* + * if a key owned by the user is accessed, then we check the + * permissions of the file. if the key owned by a different user, + * then we don't care. + */ #ifdef HAVE_CYGWIN if (check_ntsec(filename)) #endif - if (fstat(fd, &st) < 0 || - (st.st_uid != 0 && st.st_uid != getuid()) || - (st.st_mode & 077) != 0) { - close(fd); + if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) { error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @"); error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); - error("Bad ownership or mode(0%3.3o) for '%s'.", - st.st_mode & 0777, filename); + error("Permissions 0%3.3o for '%s' are too open.", + (u_int)st.st_mode & 0777, filename); error("It is recommended that your private key files are NOT accessible by others."); + error("This private key will be ignored."); return 0; } - switch (key->type) { - case KEY_RSA: - if (key->rsa->e != NULL) { - BN_clear_free(key->rsa->e); - key->rsa->e = NULL; - } - if (key->rsa->n != NULL) { - BN_clear_free(key->rsa->n); - key->rsa->n = NULL; - } - ret = load_private_key_rsa(fd, filename, passphrase, - key->rsa, comment_return); - break; + return 1; +} + +Key * +key_load_private_type(int type, const char *filename, const char *passphrase, + char **commentp, int *perm_ok) +{ + int fd; + + fd = open(filename, O_RDONLY); + if (fd < 0) { + debug("could not open key file '%s': %s", filename, + strerror(errno)); + if (perm_ok != NULL) + *perm_ok = 0; + return NULL; + } + if (!key_perm_ok(fd, filename)) { + if (perm_ok != NULL) + *perm_ok = 0; + error("bad permissions: ignore key: %s", filename); + close(fd); + return NULL; + } + if (perm_ok != NULL) + *perm_ok = 1; + switch (type) { + case KEY_RSA1: + return key_load_private_rsa1(fd, filename, passphrase, + commentp); + /* closes fd */ case KEY_DSA: - ret = load_private_key_dsa(fd, passphrase, key, comment_return); + case KEY_RSA: + case KEY_UNSPEC: + return key_load_private_pem(fd, type, passphrase, commentp); + /* closes fd */ default: + close(fd); break; } - close(fd); - return ret; + return NULL; } -int -do_load_public_key(const char *filename, Key *k, char **commentp) +Key * +key_load_private(const char *filename, const char *passphrase, + char **commentp) +{ + Key *pub, *prv; + int fd; + + fd = open(filename, O_RDONLY); + if (fd < 0) { + debug("could not open key file '%s': %s", filename, + strerror(errno)); + return NULL; + } + if (!key_perm_ok(fd, filename)) { + error("bad permissions: ignore key: %s", filename); + close(fd); + return NULL; + } + pub = key_load_public_rsa1(fd, filename, commentp); + lseek(fd, (off_t) 0, SEEK_SET); /* rewind */ + if (pub == NULL) { + /* closes fd */ + prv = key_load_private_pem(fd, KEY_UNSPEC, passphrase, NULL); + /* use the filename as a comment for PEM */ + if (commentp && prv) + *commentp = xstrdup(filename); + } else { + /* it's a SSH v1 key if the public key part is readable */ + key_free(pub); + /* closes fd */ + prv = key_load_private_rsa1(fd, filename, passphrase, NULL); + } + return prv; +} + +static int +key_try_load_public(Key *k, const char *filename, char **commentp) { FILE *f; - unsigned int bits; - char line[1024]; + char line[SSH_MAX_PUBKEY_BYTES]; char *cp; + u_long linenum = 0; f = fopen(filename, "r"); if (f != NULL) { - while (fgets(line, sizeof(line), f)) { - line[sizeof(line)-1] = '\0'; + while (read_keyfile_line(f, filename, line, sizeof(line), + &linenum) != -1) { cp = line; - switch(*cp){ + switch (*cp) { case '#': case '\n': case '\0': @@ -540,8 +650,7 @@ do_load_public_key(const char *filename, Key *k, char **commentp) for (; *cp && (*cp == ' ' || *cp == '\t'); cp++) ; if (*cp) { - bits = key_read(k, &cp); - if (bits != 0) { + if (key_read(k, &cp) == 1) { if (commentp) *commentp=xstrdup(filename); fclose(f); @@ -554,19 +663,32 @@ do_load_public_key(const char *filename, Key *k, char **commentp) return 0; } -/* load public key from pubkey file */ -int -try_load_public_key(const char *filename, Key *k, char **commentp) +/* load public key from ssh v1 private or any pubkey file */ +Key * +key_load_public(const char *filename, char **commentp) { - char pub[MAXPATHLEN]; - - if (do_load_public_key(filename, k, commentp) == 1) - return 1; - if (strlcpy(pub, filename, sizeof pub) >= MAXPATHLEN) - return 0; - if (strlcat(pub, ".pub", sizeof pub) >= MAXPATHLEN) - return 0; - if (do_load_public_key(pub, k, commentp) == 1) - return 1; - return 0; + Key *pub; + char file[MAXPATHLEN]; + + /* try rsa1 private key */ + pub = key_load_public_type(KEY_RSA1, filename, commentp); + if (pub != NULL) + return pub; + + /* try rsa1 public key */ + pub = key_new(KEY_RSA1); + if (key_try_load_public(pub, filename, commentp) == 1) + return pub; + key_free(pub); + + /* try ssh2 public key */ + pub = key_new(KEY_UNSPEC); + if (key_try_load_public(pub, filename, commentp) == 1) + return pub; + if ((strlcpy(file, filename, sizeof file) < sizeof(file)) && + (strlcat(file, ".pub", sizeof file) < sizeof(file)) && + (key_try_load_public(pub, file, commentp) == 1)) + return pub; + key_free(pub); + return NULL; }