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Add I/O error handling and use filenames instead of file descriptors

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This commit is contained in:
William Wennerström 2020-07-21 09:31:47 +02:00
parent 73f313b921
commit 62cbad1c6e
No known key found for this signature in database
GPG Key ID: E1382990BEDD319B
10 changed files with 102 additions and 71 deletions
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1
.gitignore vendored
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@ -86,3 +86,4 @@ breaks
*.tar.*
*.zip
*.log*

10
src/command/cmd_funcs.c
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@ -9192,19 +9192,13 @@ _url_open_fallback_method(ProfWin* window, const char* url)
void
_url_save_fallback_method(ProfWin* window, const char* url, const char* filename)
{
FILE* fh = fopen(filename, "wb");
if (!fh) {
cons_show_error("Cannot open file '%s' for writing.", filename);
return;
}
gchar* scheme = g_uri_parse_scheme(url);
if (g_strcmp0(scheme, "aesgcm") == 0) {
AESGCMDownload* download = malloc(sizeof(AESGCMDownload));
download->window = window;
download->url = strdup(url);
download->filehandle = fh;
download->filename = strdup(filename);
pthread_create(&(download->worker), NULL, &aesgcm_file_get, download);
aesgcm_download_add_download(download);
@ -9212,7 +9206,7 @@ _url_save_fallback_method(ProfWin* window, const char* url, const char* filename
HTTPDownload* download = malloc(sizeof(HTTPDownload));
download->window = window;
download->url = strdup(url);
download->filehandle = fh;
download->filename = strdup(filename);
pthread_create(&(download->worker), NULL, &http_file_get, download);
http_download_add_download(download);

5
src/omemo/crypto.c
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@ -35,7 +35,6 @@
#include <assert.h>
#include <signal/signal_protocol.h>
#include <signal/signal_protocol_types.h>
#include <gcrypt.h>
#include "log.h"
#include "omemo/omemo.h"
@ -377,7 +376,7 @@ out:
return res;
}
int
gcry_error_t
aes256gcm_crypt_file(FILE* in, FILE* out, off_t file_size,
unsigned char key[], unsigned char nonce[], bool encrypt)
{
@ -416,7 +415,7 @@ aes256gcm_crypt_file(FILE* in, FILE* out, off_t file_size,
off_t bytes_read = 0, bytes_available = 0, read_size = 0;
while (bytes_read < file_size) {
bytes_available = file_size - bytes_read;
if (!bytes_available) {
if (!bytes_available || ferror(in) != 0) {
break;
}

5
src/omemo/crypto.h
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@ -35,6 +35,7 @@
#include <stdio.h>
#include <stdbool.h>
#include <signal/signal_protocol_types.h>
#include <gcrypt.h>
#define AES128_GCM_KEY_LENGTH 16
#define AES128_GCM_IV_LENGTH 12
@ -183,8 +184,8 @@ int aes128gcm_decrypt(unsigned char* plaintext,
size_t ciphertext_len, const unsigned char* const iv, size_t iv_len,
const unsigned char* const key, const unsigned char* const tag);
int aes256gcm_crypt_file(FILE* in, FILE* out, off_t file_size,
unsigned char key[], unsigned char nonce[], bool encrypt);
gcry_error_t aes256gcm_crypt_file(FILE* in, FILE* out, off_t file_size,
unsigned char key[], unsigned char nonce[], bool encrypt);
char* aes256gcm_create_secure_fragment(unsigned char* key,
unsigned char* nonce);

5
src/omemo/omemo.c
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@ -1713,7 +1713,7 @@ _bytes_from_hex(const char* hex, size_t hex_size,
}
}
int
gcry_error_t
omemo_decrypt_file(FILE* in, FILE* out, off_t file_size, const char* fragment)
{
char nonce_hex[AESGCM_URL_NONCE_LEN];
@ -1733,7 +1733,8 @@ omemo_decrypt_file(FILE* in, FILE* out, off_t file_size, const char* fragment)
_bytes_from_hex(key_hex, AESGCM_URL_KEY_LEN,
key, OMEMO_AESGCM_KEY_LENGTH);
int crypt_res = aes256gcm_crypt_file(in, out, file_size, key, nonce, false);
gcry_error_t crypt_res;
crypt_res = aes256gcm_crypt_file(in, out, file_size, key, nonce, false);
gcry_free(key);

3
src/omemo/omemo.h
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@ -101,6 +101,5 @@ char* omemo_on_message_send(ProfWin* win, const char* const message, gboolean re
char* omemo_on_message_recv(const char* const from, uint32_t sid, const unsigned char* const iv, size_t iv_len, GList* keys, const unsigned char* const payload, size_t payload_len, gboolean muc, gboolean* trusted);
char* omemo_encrypt_file(FILE* in, FILE* out, off_t file_size, int* gcry_res);
int omemo_decrypt_file(FILE* in, FILE* out, off_t file_size, const char* fragment);
void omemo_free(void* a);
gcry_error_t omemo_decrypt_file(FILE* in, FILE* out, off_t file_size, const char* fragment); void omemo_free(void* a);
int omemo_parse_aesgcm_url(const char* aesgcm_url, char** https_url, char** fragment);

87
src/tools/aesgcm_download.c
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@ -67,56 +67,87 @@ aesgcm_file_get(void* userdata)
char* https_url = NULL;
char* fragment = NULL;
const size_t err_len = 100;
char err_buf[err_len];
if (omemo_parse_aesgcm_url(aesgcm_dl->url, &https_url, &fragment) != 0) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
"Download failed: Cannot parse URL.");
"Download failed: Cannot parse URL '%s'.",
aesgcm_dl->url);
return NULL;
}
int tmpfd;
char* tmpname = NULL;
if ((tmpfd = g_file_open_tmp("profanity.XXXXXX", &tmpname, NULL)) == -1) {
if (g_file_open_tmp("profanity.XXXXXX", &tmpname, NULL) == -1) {
strerror_r(errno, err_buf, err_len);
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
"Downloading '%s' failed: Unable to create "
"temporary ciphertext file for writing.",
https_url);
"temporary ciphertext file for writing "
"(%s).",
https_url, err_buf);
return NULL;
}
FILE* tmpfh = fdopen(tmpfd, "wb");
// Remove the file once it is closed.
remove(tmpname);
free(tmpname);
FILE* outfh = fopen(aesgcm_dl->filename, "wb");
if (outfh == NULL) {
strerror_r(errno, err_buf, err_len);
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
"Downloading '%s' failed: Unable to open "
"output file at '%s' for writing (%s).",
https_url, aesgcm_dl->filename, err_buf);
return NULL;
}
HTTPDownload* http_dl = malloc(sizeof(HTTPDownload));
http_dl->window = aesgcm_dl->window;
http_dl->worker = aesgcm_dl->worker;
http_dl->url = https_url;
http_dl->filehandle = tmpfh;
http_dl->close = 0;
http_dl->url = strdup(https_url);
http_dl->filename = strdup(tmpname);
aesgcm_dl->http_dl = http_dl;
// TODO: Verify result.
http_file_get(http_dl);
http_file_get(http_dl); // TODO(wstrm): Verify result.
// Force flush as the decrypt function will read from the same stream.
fflush(tmpfh);
rewind(tmpfh);
int crypt_res = omemo_decrypt_file(tmpfh, aesgcm_dl->filehandle,
http_dl->bytes_received, fragment);
fclose(tmpfh);
if (crypt_res != 0) {
FILE* tmpfh = fopen(tmpname, "rb");
if (tmpfh == NULL) {
strerror_r(errno, err_buf, err_len);
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
"Downloading '%s' failed: Failed to decrypt"
"file.",
https_url);
"Downloading '%s' failed: Unable to open "
"temporary file at '%s' for reading (%s).",
aesgcm_dl->url, aesgcm_dl->filename, err_buf);
return NULL;
}
fclose(aesgcm_dl->filehandle);
gcry_error_t crypt_res;
crypt_res = omemo_decrypt_file(tmpfh, outfh,
http_dl->bytes_received, fragment);
if (fclose(tmpfh) == EOF) {
strerror_r(errno, err_buf, err_len);
cons_show_error(err_buf);
}
remove(tmpname);
free(tmpname);
if (crypt_res != GPG_ERR_NO_ERROR) {
http_print_transfer_update(aesgcm_dl->window, aesgcm_dl->url,
"Downloading '%s' failed: Failed to decrypt "
"file (%s).",
https_url, gcry_strerror(crypt_res));
}
if (fclose(outfh) == EOF) {
strerror_r(errno, err_buf, err_len);
cons_show_error(err_buf);
}
free(https_url);
free(fragment);
free(aesgcm_dl->filename);
free(aesgcm_dl->url);
free(aesgcm_dl);
return NULL;
}

2
src/tools/aesgcm_download.h
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@ -50,7 +50,7 @@
typedef struct aesgcm_download_t
{
char* url;
FILE* filehandle;
char* filename;
ProfWin* window;
pthread_t worker;
HTTPDownload* http_dl;

52
src/tools/http_download.c
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@ -109,6 +109,9 @@ http_file_get(void* userdata)
{
HTTPDownload* download = (HTTPDownload*)userdata;
const size_t err_len = 100;
char err_buf[err_len];
char* err = NULL;
CURL* curl;
@ -118,12 +121,18 @@ http_file_get(void* userdata)
download->bytes_received = 0;
pthread_mutex_lock(&lock);
char* msg;
if (asprintf(&msg, "Downloading '%s': 0%%", download->url) == -1) {
msg = strdup(FALLBACK_MSG);
http_print_transfer_update(download->window, download->url,
"Downloading '%s': 0%%", download->url);
FILE* outfh = fopen(download->filename, "wb");
if (outfh == NULL) {
strerror_r(errno, err_buf, err_len);
http_print_transfer_update(download->window, download->url,
"Downloading '%s' failed: Unable to open "
"output file at '%s' for writing (%s).",
download->url, download->filename, err_buf);
return NULL;
}
win_print_http_transfer(download->window, msg, download->url);
free(msg);
char* cert_path = prefs_get_string(PREF_TLS_CERTPATH);
pthread_mutex_unlock(&lock);
@ -142,7 +151,7 @@ http_file_get(void* userdata)
#endif
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)download->filehandle);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)outfh);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "profanity");
@ -157,35 +166,31 @@ http_file_get(void* userdata)
curl_easy_cleanup(curl);
curl_global_cleanup();
if (download->filehandle && download->close) {
fclose(download->filehandle);
if (fclose(outfh) == EOF) {
strerror_r(errno, err_buf, err_len);
err = strdup(err_buf);
}
pthread_mutex_lock(&lock);
g_free(cert_path);
if (err) {
char* msg;
if (download->cancel) {
if (asprintf(&msg, "Downloading '%s' failed: Download was canceled", download->url) == -1) {
msg = strdup(FALLBACK_MSG);
}
http_print_transfer_update(download->window, download->url,
"Downloading '%s' failed: "
"Download was canceled",
download->url);
} else {
if (asprintf(&msg, "Downloading '%s' failed: %s", download->url, err) == -1) {
msg = strdup(FALLBACK_MSG);
}
win_update_entry_message(download->window, download->url, msg);
http_print_transfer_update(download->window, download->url,
"Downloading '%s' failed: %s",
download->url, err);
}
cons_show_error(msg);
free(msg);
free(err);
} else {
if (!download->cancel) {
if (asprintf(&msg, "Downloading '%s': 100%%", download->url) == -1) {
msg = strdup(FALLBACK_MSG);
}
win_update_entry_message(download->window, download->url, msg);
http_print_transfer_update(download->window, download->url,
"Downloading '%s': 100%%",
download->url);
win_mark_received(download->window, download->url);
free(msg);
}
}
@ -193,6 +198,7 @@ http_file_get(void* userdata)
pthread_mutex_unlock(&lock);
free(download->url);
free(download->filename);
free(download);
return NULL;

3
src/tools/http_download.h
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@ -49,12 +49,11 @@
typedef struct http_download_t
{
char* url;
FILE* filehandle;
char* filename;
curl_off_t bytes_received;
ProfWin* window;
pthread_t worker;
int cancel;
int close;
} HTTPDownload;
void* http_file_get(void* userdata);