thodg/libgit2/src/transports/cred.c

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• Hash : 392702ee
  Author :
  Date : 2015-02-09T23:41:13
  

  allocations: test for overflow of requested size Introduce some helper macros to test integer overflow from arithmetic and set error message appropriately.

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• src/transports/cred.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "git2.h"
  #include "smart.h"
  #include "git2/cred_helpers.h"
  
  int git_cred_has_username(git_cred *cred)
  {
  	if (cred->credtype == GIT_CREDTYPE_DEFAULT)
  		return 0;
  
  	return 1;
  }
  
  const char *git_cred__username(git_cred *cred)
  {
  	switch (cred->credtype) {
  	case GIT_CREDTYPE_USERNAME:
  	{
  		git_cred_username *c = (git_cred_username *) cred;
  		return c->username;
  	}
  	case GIT_CREDTYPE_USERPASS_PLAINTEXT:
  	{
  		git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *) cred;
  		return c->username;
  	}
  	case GIT_CREDTYPE_SSH_KEY:
  	{
  		git_cred_ssh_key *c = (git_cred_ssh_key *) cred;
  		return c->username;
  	}
  	case GIT_CREDTYPE_SSH_CUSTOM:
  	{
  		git_cred_ssh_custom *c = (git_cred_ssh_custom *) cred;
  		return c->username;
  	}
  	case GIT_CREDTYPE_SSH_INTERACTIVE:
  	{
  		git_cred_ssh_interactive *c = (git_cred_ssh_interactive *) cred;
  		return c->username;
  	}
  
  	default:
  		return NULL;
  	}
  }
  
  static void plaintext_free(struct git_cred *cred)
  {
  	git_cred_userpass_plaintext *c = (git_cred_userpass_plaintext *)cred;
  
  	git__free(c->username);
  
  	/* Zero the memory which previously held the password */
  	if (c->password) {
  		size_t pass_len = strlen(c->password);
  		git__memzero(c->password, pass_len);
  		git__free(c->password);
  	}
  
  	git__free(c);
  }
  
  int git_cred_userpass_plaintext_new(
  	git_cred **cred,
  	const char *username,
  	const char *password)
  {
  	git_cred_userpass_plaintext *c;
  
  	assert(cred && username && password);
  
  	c = git__malloc(sizeof(git_cred_userpass_plaintext));
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_USERPASS_PLAINTEXT;
  	c->parent.free = plaintext_free;
  	c->username = git__strdup(username);
  
  	if (!c->username) {
  		git__free(c);
  		return -1;
  	}
  
  	c->password = git__strdup(password);
  
  	if (!c->password) {
  		git__free(c->username);
  		git__free(c);
  		return -1;
  	}
  
  	*cred = &c->parent;
  	return 0;
  }
  
  static void ssh_key_free(struct git_cred *cred)
  {
  	git_cred_ssh_key *c =
  		(git_cred_ssh_key *)cred;
  
  	git__free(c->username);
  
  	if (c->privatekey) {
  		/* Zero the memory which previously held the private key */
  		size_t key_len = strlen(c->privatekey);
  		git__memzero(c->privatekey, key_len);
  		git__free(c->privatekey);
  	}
  
  	if (c->passphrase) {
  		/* Zero the memory which previously held the passphrase */
  		size_t pass_len = strlen(c->passphrase);
  		git__memzero(c->passphrase, pass_len);
  		git__free(c->passphrase);
  	}
  
  	if (c->publickey) {
  		/* Zero the memory which previously held the public key */
  		size_t key_len = strlen(c->publickey);
  		git__memzero(c->publickey, key_len);
  		git__free(c->publickey);
  	}
  
  	git__free(c);
  }
  
  static void ssh_interactive_free(struct git_cred *cred)
  {
  	git_cred_ssh_interactive *c = (git_cred_ssh_interactive *)cred;
  
  	git__free(c->username);
  
  	git__free(c);
  }
  
  static void ssh_custom_free(struct git_cred *cred)
  {
  	git_cred_ssh_custom *c = (git_cred_ssh_custom *)cred;
  
  	git__free(c->username);
  
  	if (c->publickey) {
  		/* Zero the memory which previously held the publickey */
  		size_t key_len = strlen(c->publickey);
  		git__memzero(c->publickey, key_len);
  		git__free(c->publickey);
  	}
  
  	git__free(c);
  }
  
  static void default_free(struct git_cred *cred)
  {
  	git_cred_default *c = (git_cred_default *)cred;
  
  	git__free(c);
  }
  
  static void username_free(struct git_cred *cred)
  {
  	git__free(cred);
  }
  
  int git_cred_ssh_key_new(
  	git_cred **cred,
  	const char *username,
  	const char *publickey,
  	const char *privatekey,
  	const char *passphrase)
  {
  	git_cred_ssh_key *c;
  
  	assert(username && cred && privatekey);
  
  	c = git__calloc(1, sizeof(git_cred_ssh_key));
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_SSH_KEY;
  	c->parent.free = ssh_key_free;
  
  	c->username = git__strdup(username);
  	GITERR_CHECK_ALLOC(c->username);
  
  	c->privatekey = git__strdup(privatekey);
  	GITERR_CHECK_ALLOC(c->privatekey);
  
  	if (publickey) {
  		c->publickey = git__strdup(publickey);
  		GITERR_CHECK_ALLOC(c->publickey);
  	}
  
  	if (passphrase) {
  		c->passphrase = git__strdup(passphrase);
  		GITERR_CHECK_ALLOC(c->passphrase);
  	}
  
  	*cred = &c->parent;
  	return 0;
  }
  
  int git_cred_ssh_interactive_new(
  	git_cred **out,
  	const char *username,
  	git_cred_ssh_interactive_callback prompt_callback,
  	void *payload)
  {
  	git_cred_ssh_interactive *c;
  
  	assert(out && username && prompt_callback);
  
  	c = git__calloc(1, sizeof(git_cred_ssh_interactive));
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_SSH_INTERACTIVE;
  	c->parent.free = ssh_interactive_free;
  
  	c->username = git__strdup(username);
  	GITERR_CHECK_ALLOC(c->username);
  
  	c->prompt_callback = prompt_callback;
  	c->payload = payload;
  
  	*out = &c->parent;
  	return 0;
  }
  
  int git_cred_ssh_key_from_agent(git_cred **cred, const char *username) {
  	git_cred_ssh_key *c;
  
  	assert(username && cred);
  
  	c = git__calloc(1, sizeof(git_cred_ssh_key));
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_SSH_KEY;
  	c->parent.free = ssh_key_free;
  
  	c->username = git__strdup(username);
  	GITERR_CHECK_ALLOC(c->username);
  
  	c->privatekey = NULL;
  
  	*cred = &c->parent;
  	return 0;
  }
  
  int git_cred_ssh_custom_new(
  	git_cred **cred,
  	const char *username,
  	const char *publickey,
  	size_t publickey_len,
  	git_cred_sign_callback sign_callback,
  	void *payload)
  {
  	git_cred_ssh_custom *c;
  
  	assert(username && cred);
  
  	c = git__calloc(1, sizeof(git_cred_ssh_custom));
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_SSH_CUSTOM;
  	c->parent.free = ssh_custom_free;
  
  	c->username = git__strdup(username);
  	GITERR_CHECK_ALLOC(c->username);
  
  	if (publickey_len > 0) {
  		c->publickey = git__malloc(publickey_len);
  		GITERR_CHECK_ALLOC(c->publickey);
  
  		memcpy(c->publickey, publickey, publickey_len);
  	}
  
  	c->publickey_len = publickey_len;
  	c->sign_callback = sign_callback;
  	c->payload = payload;
  
  	*cred = &c->parent;
  	return 0;
  }
  
  int git_cred_default_new(git_cred **cred)
  {
  	git_cred_default *c;
  
  	assert(cred);
  
  	c = git__calloc(1, sizeof(git_cred_default));
  	GITERR_CHECK_ALLOC(c);
  
  	c->credtype = GIT_CREDTYPE_DEFAULT;
  	c->free = default_free;
  
  	*cred = c;
  	return 0;
  }
  
  int git_cred_username_new(git_cred **cred, const char *username)
  {
  	git_cred_username *c;
  	size_t len;
  
  	assert(cred);
  
  	len = strlen(username);
  
  	GITERR_CHECK_ALLOC_ADD(sizeof(git_cred_username), len);
  	GITERR_CHECK_ALLOC_ADD(sizeof(git_cred_username) + len, 1);
  	c = git__malloc(sizeof(git_cred_username) + len + 1);
  	GITERR_CHECK_ALLOC(c);
  
  	c->parent.credtype = GIT_CREDTYPE_USERNAME;
  	c->parent.free = username_free;
  	memcpy(c->username, username, len + 1);
  
  	*cred = (git_cred *) c;
  	return 0;
  }
  

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