Add generic password to MacOS Keychain with C

add_generic_password.c

// Build: gcc -framework Security -framework Foundation -o add_generic_password add_generic_password.c
// Usage: ./add_generic_password <service name> <username> <password>

#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>

int main(int argc, const char* argv[]) {
    if (argc < 4) {
        fprintf(stderr, "Usage: ./add_generic_pasword <service name> <username> <password>");
        return 1;
    }

    const char* serviceName = argv[1];
    const char* userName = argv[2];
    const char* password = argv[3];

    CFStringRef keys[4];
    keys[0] = kSecClass;
    keys[1] = kSecAttrService;
    keys[2] = kSecAttrAccount;
    keys[3] = kSecValueData;

    CFTypeRef values[4];
    values[0] = kSecClassGenericPassword;
    values[1] = CFStringCreateWithCString(kCFAllocatorDefault, serviceName, kCFStringEncodingUTF8);
    values[2] = CFStringCreateWithCString(kCFAllocatorDefault, userName, kCFStringEncodingUTF8);
    values[3] = CFStringCreateWithCString(kCFAllocatorDefault, password, kCFStringEncodingUTF8);

    CFDictionaryRef query = CFDictionaryCreate(kCFAllocatorDefault, (const void**) keys, (const void**) values, 4, NULL, NULL);

    OSStatus result = SecItemAdd(query, NULL);
    printf("Result: %d\n", result);

    CFRelease(values[1]);
    CFRelease(values[2]);
    CFRelease(values[3]);
    CFRelease(query);

    return 0;
}