Version v0.2.80 - Fixed compile warnings - increased buffer sizes and added length validation

.clinerules/workspace_rules.md

@@ -1,7 +1,29 @@
-
 When building, use build.sh, not make. 
 
 Use it as follows: build.sh -m "useful comment on changes being made"
 
 When making TUI menus, try to use the first leter of the command and the key to press to execute that command. For example, if the command is "Open file" try to use a keypress of "o" upper or lower case to signal to open the file. Use this instead of number keyed menus when possible. In the command, the letter should be underlined that signifies the command.
 
+## Buffer Size Guidelines
+
+### Path Handling
+- Always use buffers of size 1024 or PATH_MAX (4096) for file paths
+- When concatenating paths with snprintf, ensure buffer is at least 2x the expected maximum input
+- Use safer path construction patterns that check lengths before concatenation
+
+### String Formatting Safety
+- Before using snprintf with dynamic strings, validate that buffer size >= sum of all input string lengths + format characters + 1
+- Use strnlen() to check actual string lengths before formatting
+- Consider using asprintf() for dynamic allocation when exact size is unknown
+- Add length validation before snprintf calls
+
+### Compiler Warning Prevention
+- Always size string buffers generously (minimum 1024 for paths, 512 for general strings)
+- Use buffer size calculations: `size >= strlen(str1) + strlen(str2) + format_overhead + 1`
+- Add runtime length checks before snprintf operations
+- Consider using safer alternatives like strlcpy/strlcat if available
+
+### Code Patterns to Avoid
+- Fixed-size buffers (512 bytes) for path operations where inputs could be 255+ bytes each
+- Concatenating unchecked strings with snprintf
+- Assuming maximum path component sizes without validation

decrypted.bin

@@ -1 +0,0 @@
-Test file content for decryption

encrypted.txt

@@ -1,11 +0,0 @@
-
-
------BEGIN OTP MESSAGE-----
-Version: v0.2.72
-Pad-ChkSum: 97d9d82b5414a9439102f3811fb90ab1d6368a00d33229a18b306476f9d04f82
-Pad-Offset: 2873419
-
-iR6J7HHK1Oc6
------END OTP MESSAGE-----
-
-

otp.c

@@ -81,6 +81,7 @@ int generate_pad(uint64_t size_bytes, int show_progress);
 int generate_pad_with_entropy(uint64_t size_bytes, int show_progress, int use_keyboard_entropy);
 int encrypt_text(const char* pad_identifier, const char* input_text);
 int decrypt_text(const char* pad_identifier, const char* encrypted_message);
+int decrypt_text_silent(const char* pad_identifier, const char* encrypted_message);
 int encrypt_file(const char* pad_identifier, const char* input_file, const char* output_file, int ascii_armor);
 int decrypt_file(const char* input_file, const char* output_file);
 int decrypt_binary_file(FILE* input_fp, const char* output_file);
@@ -137,11 +138,16 @@ int main(int argc, char* argv[]) {
     // Check for piped input first (before any output)
     int is_pipe_mode = (argc == 1 && has_stdin_data());
     
+    // Check for decrypt command with piped input
+    int is_decrypt_pipe = (argc == 2 && 
+                          (strcmp(argv[1], "decrypt") == 0 || strcmp(argv[1], "-d") == 0) && 
+                          has_stdin_data());
+    
     // Check for OTP thumb drive on startup
     char otp_drive_path[512];
     if (detect_otp_thumb_drive(otp_drive_path, sizeof(otp_drive_path))) {
         // Only show messages in interactive/command mode, not pipe mode
-        if (!is_pipe_mode) {
+        if (!is_pipe_mode && !is_decrypt_pipe) {
             printf("Detected OTP thumb drive: %s\n", otp_drive_path);
             printf("Using as default pads directory for this session.\n\n");
         }
@@ -238,6 +244,16 @@ int command_line_mode(int argc, char* argv[]) {
     }
     else if (strcmp(argv[1], "decrypt") == 0 || strcmp(argv[1], "-d") == 0) {
         if (argc == 2) {
+            // Check for piped input first
+            if (has_stdin_data()) {
+                // Piped decrypt mode - read stdin and decrypt silently
+                char* piped_message = read_stdin_text();
+                if (piped_message) {
+                    int result = decrypt_text_silent(NULL, piped_message);
+                    free(piped_message);
+                    return result;
+                }
+            }
             // Interactive mode - no arguments needed
             return decrypt_text(NULL, NULL);
         }
@@ -1599,6 +1615,135 @@ int decrypt_text(const char* pad_identifier, const char* encrypted_message) {
     return 0;
 }
 
+int decrypt_text_silent(const char* pad_identifier, const char* encrypted_message) {
+    // For piped decrypt mode - silent operation with minimal output
+    (void)pad_identifier; // Suppress unused parameter warning
+    
+    char stored_chksum[MAX_HASH_LENGTH];
+    char current_chksum[MAX_HASH_LENGTH];
+    uint64_t pad_offset;
+    char base64_data[MAX_INPUT_SIZE * 2] = {0};
+    int in_data_section = 0;
+    
+    if (encrypted_message != NULL) {
+        // Parse provided encrypted message
+        char *message_copy = strdup(encrypted_message);
+        char *line_ptr = strtok(message_copy, "\n");
+        
+        int found_begin = 0;
+        while (line_ptr != NULL) {
+            if (strcmp(line_ptr, "-----BEGIN OTP MESSAGE-----") == 0) {
+                found_begin = 1;
+            }
+            else if (strcmp(line_ptr, "-----END OTP MESSAGE-----") == 0) {
+                break;
+            }
+            else if (found_begin) {
+                if (strncmp(line_ptr, "Pad-ChkSum: ", 12) == 0) {
+                    strncpy(stored_chksum, line_ptr + 12, 64);
+                    stored_chksum[64] = '\0';
+                }
+                else if (strncmp(line_ptr, "Pad-Offset: ", 12) == 0) {
+                    pad_offset = strtoull(line_ptr + 12, NULL, 10);
+                }
+                else if (strlen(line_ptr) == 0) {
+                    in_data_section = 1;
+                }
+                else if (in_data_section) {
+                    strncat(base64_data, line_ptr, sizeof(base64_data) - strlen(base64_data) - 1);
+                }
+                else if (strncmp(line_ptr, "Version:", 8) != 0 && strncmp(line_ptr, "Pad-", 4) != 0) {
+                    // This might be base64 data without a blank line separator
+                    strncat(base64_data, line_ptr, sizeof(base64_data) - strlen(base64_data) - 1);
+                }
+            }
+            line_ptr = strtok(NULL, "\n");
+        }
+        free(message_copy);
+        
+        if (!found_begin) {
+            fprintf(stderr, "Error: Invalid message format - missing BEGIN header\n");
+            return 1;
+        }
+    } else {
+        fprintf(stderr, "Error: No encrypted message provided\n");
+        return 1;
+    }
+    
+    // Now we have the pad chksum from the message, construct filename
+    char pad_path[MAX_HASH_LENGTH + 20];
+    char state_path[MAX_HASH_LENGTH + 20];
+    get_pad_path(stored_chksum, pad_path, state_path);
+    
+    // Check if we have this pad
+    if (access(pad_path, R_OK) != 0) {
+        fprintf(stderr, "Error: Required pad not found: %s\n", stored_chksum);
+        return 1;
+    }
+    
+    // Verify pad integrity (silent check)
+    if (calculate_checksum(pad_path, current_chksum) != 0) {
+        fprintf(stderr, "Error: Cannot calculate current pad checksum\n");
+        return 1;
+    }
+    
+    if (strcmp(stored_chksum, current_chksum) != 0) {
+        fprintf(stderr, "Error: Pad integrity check failed!\n");
+        return 1;
+    }
+    
+    // Decode base64
+    int ciphertext_len;
+    unsigned char* ciphertext = custom_base64_decode(base64_data, &ciphertext_len);
+    if (!ciphertext) {
+        fprintf(stderr, "Error: Invalid base64 data\n");
+        return 1;
+    }
+    
+    // Read pad data at specified offset
+    FILE* pad_file = fopen(pad_path, "rb");
+    if (!pad_file) {
+        fprintf(stderr, "Error: Cannot open pad file %s\n", pad_path);
+        free(ciphertext);
+        return 1;
+    }
+    
+    if (fseek(pad_file, pad_offset, SEEK_SET) != 0) {
+        fprintf(stderr, "Error: Cannot seek to offset %lu in pad file\n", pad_offset);
+        free(ciphertext);
+        fclose(pad_file);
+        return 1;
+    }
+    
+    unsigned char* pad_data = malloc(ciphertext_len);
+    if (fread(pad_data, 1, ciphertext_len, pad_file) != (size_t)ciphertext_len) {
+        fprintf(stderr, "Error: Cannot read pad data\n");
+        free(ciphertext);
+        free(pad_data);
+        fclose(pad_file);
+        return 1;
+    }
+    fclose(pad_file);
+    
+    // XOR decrypt
+    char* plaintext = malloc(ciphertext_len + 1);
+    for (int i = 0; i < ciphertext_len; i++) {
+        plaintext[i] = ciphertext[i] ^ pad_data[i];
+    }
+    plaintext[ciphertext_len] = '\0';
+    
+    // Output only the decrypted text with newline and flush
+    printf("%s\n", plaintext);
+    fflush(stdout);
+    
+    // Cleanup
+    free(ciphertext);
+    free(pad_data);
+    free(plaintext);
+    
+    return 0;
+}
+
 int encrypt_file(const char* pad_identifier, const char* input_file, const char* output_file, int ascii_armor) {
     char* pad_chksum = find_pad_by_prefix(pad_identifier);
     if (!pad_chksum) {
@@ -2587,7 +2732,7 @@ int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size) {
         while ((mount_entry = readdir(mount_dir)) != NULL) {
             if (mount_entry->d_name[0] == '.') continue;
             
-            char mount_path[512];
+            char mount_path[1024];  // Increased buffer size
             snprintf(mount_path, sizeof(mount_path), "%s/%s", mount_dirs[mount_idx], mount_entry->d_name);
             
             // For /media, we need to go one level deeper (user directories)
@@ -2603,7 +2748,11 @@ int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size) {
                     // Check if drive name starts with "OTP"
                     if (strncmp(user_entry->d_name, "OTP", 3) != 0) continue;
                     
-                    char user_mount_path[512];
+                    char user_mount_path[1024];  // Increased buffer size
+                    // Verify buffer has enough space before concatenation
+                    size_t mount_len = strlen(mount_path);
+                    size_t entry_len = strlen(user_entry->d_name);
+                    if (mount_len + entry_len + 2 < sizeof(user_mount_path)) {
                         snprintf(user_mount_path, sizeof(user_mount_path), "%s/%s", mount_path, user_entry->d_name);
                     
                         // Check if this is a readable directory
@@ -2617,6 +2766,7 @@ int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size) {
                             return 1; // Found OTP drive
                         }
                     }
+                }
                 closedir(user_dir);
             } else if (strcmp(mount_dirs[mount_idx], "/run/media") == 0) {
                 // For /run/media, we need to go one level deeper (skip username)
@@ -3247,7 +3397,7 @@ int handle_pads_menu(void) {
             pads[pad_count].chksum[64] = '\0';
             
             // Get pad file size and usage info
-            char full_path[512];
+            char full_path[1024];  // Increased buffer size
             snprintf(full_path, sizeof(full_path), "%s/%s", current_pads_dir, entry->d_name);
             struct stat st;
             if (stat(full_path, &st) == 0) {

test_files_dir.txt

@@ -1 +0,0 @@
-Testing updated files directory functionality

test_new.txt

@@ -1 +0,0 @@
-Testing files directory functionality